diff --git a/.agents/skills/polyxml-codegen-workflow/SKILL.md b/.agents/skills/polyxml-codegen-workflow/SKILL.md
index a522d15..dbc41d6 100644
--- a/.agents/skills/polyxml-codegen-workflow/SKILL.md
+++ b/.agents/skills/polyxml-codegen-workflow/SKILL.md
@@ -8,6 +8,42 @@ description: >-
 
 # PolyXML Polyglot Codegen Development & Verification Playbook
 
+## XSD attribute values
+
+Use separate `CARGO_TARGET_DIR` paths for revision-specific CLI/native-binding
+verification. A shared debug target can leave another checkout's same-named
+top-level binary or cdylib in place even when Cargo reports a fresh build. Probe
+a discriminating fixture before claiming a baseline comparison, record the
+executable/binding hashes, and retain rejected preflights separately. The runtime
+comparison runners already isolate baseline and candidate consumer targets.
+
+Normalize schema attributes with quick-xml's `normalized_value` before placing
+them in the IR. This resolves built-in/numeric references once and normalizes
+literal XML attribute whitespace while preserving referenced whitespace. Use the
+same decoded values for namespace declarations, QName validation, UPA, facets,
+enumerations and default/fixed constraints. Propagate malformed attributes and
+reference errors; do not turn them into absent values. Validate attributes even
+inside otherwise skipped annotations. Regression fixtures are in
+`research/fixtures/schema_attribute_entities.xsd` and
+`tests/test_schema_attribute_entities.rs` in the core crate.
+
+Decoded enum values need target-language string literal escaping at every output
+site: metadata attributes, constants, conversion tables and parse matches. Rust
+debug string formatting is suitable for Rust, but its `\u{...}` escapes are not
+portable to other targets. The shared JSON-compatible literal helper also
+escapes U+0085/U+2028/U+2029 because C# treats them as source line terminators;
+C++ uses fixed-width octal escapes for ASCII controls. Execute
+`test_enum_literal_codegen` with all seven toolchains to verify exact runtime
+values and Rust Serde round trips, not just whether generated files exist.
+
+Schema defaults and fixed values need the same literal escaping as enums.
+Python metadata must not use Rust Debug escapes, and C++ defaults need C++
+control-character escapes. C# defaults parsed through an internal XML element
+must encode carriage returns as `
` after escaping XML markup; otherwise XML
+line-ending normalization changes the lexical value. Execute generated consumers
+against independent UTF-8 expected data, including backslash-u text, referenced
+whitespace, Unicode line separators, empty-element defaults and fixed rejection.
+
 ## C# runtime availability for smoke checks
 
 The C# execution fixtures target `net8.0`. An installed .NET 10 SDK/runtime
@@ -934,3 +970,11 @@ owned/borrowed XML and JSON round trips, use the declared root name explicitly
 when it differs from its type name, and distinguish C++/TypeScript model-only
 generation from their runtime binding schemas. Strict docs builds catch broken
 anchors and misplaced code fences, including guides appended after old fences.
+
+When Python generated-model tests use an isolated absolute CARGO_TARGET_DIR,
+resolve the CLI under that target, not the checkout's default target directory
+or an unrelated global executable. Relative target values resolve from the
+checkout because the helper builds with that cwd. The generated-model test
+helper now honors this override and builds the matching CLI if needed. Keep
+workspace targets owned by one worktree; switching checkouts in a shared target
+can leave stale unchanged executables even after a core compile message.
diff --git a/.agents/skills/polyxml-core-engine/SKILL.md b/.agents/skills/polyxml-core-engine/SKILL.md
index 86dd4b3..e291ef3 100644
--- a/.agents/skills/polyxml-core-engine/SKILL.md
+++ b/.agents/skills/polyxml-core-engine/SKILL.md
@@ -272,5 +272,20 @@ lexical-list obligations before traversing repeated values. Ordinary nested
 records validate their own fields. Lexical lists append tokens to one string;
 retain whitespace-token rejection, escaping and empty-list behavior.
 
+An explicit null in the ordered mixed item stream is a present nil element,
+including for nested branches. Serialize it with a local instance namespace
+binding; avoid shadowing the element QName's prefix. Keep empty strings distinct
+from nulls and preserve item order. Mixed branch schemas do not retain nillable
+constraints, and the dynamic reader remains permissive; this round-trip behavior
+does not establish nillability validation or ordinary optional-field nil output.
+
 For measured changes, use
 [polyxml-runtime-investigation](../polyxml-runtime-investigation/SKILL.md).
+
+Namespace declarations are XML attribute values too: unescape predefined and
+numeric references exactly once before storing their URI in NamespaceScope.
+Propagate failures through document entry, nested Start/Empty handling and
+XmlItemStream inheritance. Compare decoded URIs for strict-root and xsi:type
+matching; escaped source text is not the namespace name. Preserve inherited
+already-decoded bindings and test a literal amp-entity spelling against double
+decoding.
diff --git a/.agents/skills/polyxml-runtime-investigation/SKILL.md b/.agents/skills/polyxml-runtime-investigation/SKILL.md
index b43445f..64b086c 100644
--- a/.agents/skills/polyxml-runtime-investigation/SKILL.md
+++ b/.agents/skills/polyxml-runtime-investigation/SKILL.md
@@ -30,6 +30,11 @@ separate from the schema-driven `PolyValue` runtime.
   also matches deserialization. Remove stale results only in the runner's owned
   scratch directory before measurement, not from retained raw evidence.
 - Check rich enums, patterns, lists and mixed branches alongside plain records.
+  The `mixed.rs` consumer checks text/scalar/enum/pattern/nested ordered items.
+  Text/GeneralRef/CData boundaries may coalesce when written: compare adjacent
+  text's concatenated value, rather than treating token segmentation as XML
+  semantics. Keep nil correctness tests separate from baseline timing consumers
+  when the baseline cannot serialize nil.
   Warm pattern-cache gains do not establish cold-start, churn or concurrent
   throughput. Entry/key bounds do not constitute a compiled-regex byte budget.
 - Preserve validation, errors, split Text/CData/GeneralRef handling, nil reads,
@@ -42,3 +47,40 @@ separate from the schema-driven `PolyValue` runtime.
 - Publish positive and negative experiments with exact source revisions, raw
   evidence and remaining regressions. Run the full quality gate before pushing
   the experiment branch; a branch request does not authorize a merge to main.
+
+For mixed schemas with many possible child tags, measure the linear branch scan
+with `mixed_branches.rs`, including sparse one-item controls. A temporary index
+can borrow kind keys and branch references for large repeated payloads without
+persisting stale mutable metadata. Preserve the original first-match behavior
+for duplicate kind names; test metadata edits, tagged records, nil and unknown
+kinds. Keep small tables on a linear path and measure the chosen crossover.
+
+Check the indexing cutoff with short documents too. A 256-branch table built for
+64 mixed items was 30% slower, despite a 54% gain at 1,000 items. Requiring at
+least 64 items and half as many items as branches avoids that observed crossover
+regression. Retain 32/64/128-item controls, and keep the cutoff heuristic separate
+from semantic behavior: duplicate first-match ordering and metadata edits still
+need independent correctness tests.
+
+Also measure concentrated tag reuse and text-heavy content. Even above the
+size cutoff, repeated first-branch hits were 11–20% slower with a hash table.
+A bounded, evenly spaced sample can select linear lookup when the observed
+branch-search work is low. Treat sampling as a performance heuristic only;
+normal writer validation must still examine every item and preserve errors.
+
+Offset samples within their bins and include a power-of-two item count: a
+strictly evenly spaced sample can repeatedly hit the first tag when the choice
+cycle divides its stride, overlooking a distributed payload's lookup work.
+
+For large investigations, retain Criterion process directories in per-experiment
+archives rather than thousands of loose JSON files in a PR. Verify the original
+manifest, archive every file with its relative path, read back and compare each
+member's checksum before removing loose copies, and retain member/top-level
+manifests plus the packaging script. Extract into scratch to rerun summaries.
+
+For an integration branch containing merge commits, use `git pull --rebase=merges
+origin main` before pushing so synchronization preserves the reviewed branch
+history. Ordinary rebase flattens merges even when main has not advanced. If the
+repository has no committer identity configured, pass the maintainer identity via
+per-command `git -c user.name=... -c user.email=...`; do not change global config.
+Stop a publish sequence if pull fails, and check the tested source tree afterward.
diff --git a/benchmarks/rust-runtime-investigation/README.md b/benchmarks/rust-runtime-investigation/README.md
index 8c2e4f4..136e647 100644
--- a/benchmarks/rust-runtime-investigation/README.md
+++ b/benchmarks/rust-runtime-investigation/README.md
@@ -113,3 +113,35 @@ For the generated sensor control, run the XML/Serde regression runner and use
 its output directory. This computes each process's median of seven timing
 samples, then the median across processes; it retains the process deltas. The
 statistic differs from the Criterion process means above.
+
+## Ordered mixed content
+
+Use `--harness benchmarks/rust-runtime-investigation/mixed.rs` for 1,000
+text, scalar, enum, warm-pattern or nested mixed items. Every decoded payload
+is checked before timing. Adjacent text events can be coalesced on output, so
+the text case compares the concatenated text value after a round trip; element
+cases compare the complete ordered value. These cases contain no nil items and
+can compare revisions whose nil writer is broken. Cover nil output separately
+with `test_mixed_nil`; a timing harness must not turn a known correctness
+failure into a performance result.
+
+`mixed_branches.rs` varies the child-tag table across 1, 16, 64 and 256 entries
+and the payload across 1, 32, 64, 128, 1,000 and 1,024 items. It checks every kind against its
+expected wire name and every integer before timing, then checks the full
+round trip. Use `^branch_write/.*/1000$` to screen repeated writes; retain sparse
+and read controls before promoting a branch-lookup optimization. A temporary
+index trades a per-container allocation for faster repeated lookup. It must
+preserve first-match behavior and rebuild after mutable metadata edits.
+
+The mixed branch consumer also includes 32, 64 and 128 items to check index
+construction cost. The trigger requires at least 64 branches, at least 64 items,
+and items numbering at least half the branch count. This is a measured heuristic,
+not a universal break-even guarantee; tag distribution and text-only content can
+affect how much lookup work is saved.
+
+The final selector samples at most 16 items spread across the payload, requiring at least
+four tagged samples and an average linear-search depth of 16 before indexing.
+This avoids the observed repeated-first-tag regression and skips a table for
+text-only content. It is a heuristic, so retain concentrated/distributed cases
+and the actual sampled payload along with timing evidence. All items still pass
+through the normal writer validation.
diff --git a/benchmarks/rust-runtime-investigation/mixed.rs b/benchmarks/rust-runtime-investigation/mixed.rs
new file mode 100644
index 0000000..7d0413e
--- /dev/null
+++ b/benchmarks/rust-runtime-investigation/mixed.rs
@@ -0,0 +1,120 @@
+use criterion::{
+    criterion_group, criterion_main, BenchmarkId, Criterion, SamplingMode, Throughput,
+};
+use polyxml::schema::ModelSchema;
+use polyxml::schema_parser::XsdParser;
+use polyxml::{deserialize, serialize, PolyValue};
+use std::{hint::black_box, sync::Arc};
+
+fn fixture(kind: &str, count: usize) -> (Arc<ModelSchema>, Vec<u8>) {
+    let xsd = r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
+      <xs:simpleType name="State"><xs:restriction base="xs:string"><xs:enumeration value="Ready"/><xs:enumeration value="Done"/></xs:restriction></xs:simpleType>
+      <xs:simpleType name="Code"><xs:restriction base="xs:string"><xs:pattern value="[A-Z]{3}[0-9]{3}"/></xs:restriction></xs:simpleType>
+      <xs:element name="Root"><xs:complexType mixed="true"><xs:choice minOccurs="0" maxOccurs="unbounded">
+        <xs:element name="Text" type="xs:string"/>
+        <xs:element name="Number" type="xs:int"/>
+        <xs:element name="State" type="State"/>
+        <xs:element name="Code" type="Code"/>
+        <xs:element name="Child"><xs:complexType><xs:sequence><xs:element name="Value" type="xs:string"/></xs:sequence></xs:complexType></xs:element>
+      </xs:choice></xs:complexType></xs:element>
+    </xs:schema>"#;
+    let ir = XsdParser::new().parse_str(xsd).unwrap();
+    let schema = ModelSchema::from_ir(&ir, Some("Root")).unwrap();
+    let mut xml = String::from("<Root>");
+    for index in 0..count {
+        let part = match kind {
+            "text" => format!("text-{index}&amp;<![CDATA[more]]>"),
+            "scalar" => format!("<Text>item-{index}&amp;<![CDATA[more]]></Text>"),
+            "enum" => "<State>Ready</State>".into(),
+            "pattern" => format!("<Code>ABC{:03}</Code>", index % 1000),
+            "nested" => format!("<Child><Value>item-{index}</Value></Child>"),
+            _ => unreachable!(),
+        };
+        xml.push_str(&part);
+    }
+    xml.push_str("</Root>");
+    let value = deserialize(xml.as_bytes(), Arc::clone(&schema)).unwrap();
+    let items_name = &schema.fields[schema.mixed_content.as_ref().unwrap().items_index].name;
+    let items = value.get(items_name).and_then(PolyValue::as_list).unwrap();
+    if kind == "text" {
+        // Text, GeneralRef and CData become separate ordered items.
+        assert_eq!(items.len(), count * 3);
+        for (index, items) in items.chunks_exact(3).enumerate() {
+            for (item, expected) in
+                items
+                    .iter()
+                    .zip([format!("text-{index}"), "&".into(), "more".into()])
+            {
+                assert_eq!(item.get("kind").and_then(PolyValue::as_str), Some("#text"));
+                assert_eq!(
+                    item.get("value").and_then(PolyValue::as_str),
+                    Some(expected.as_str())
+                );
+            }
+        }
+    } else {
+        assert_eq!(items.len(), count);
+        for (index, item) in items.iter().enumerate() {
+            let value = item.get("value").unwrap();
+            match kind {
+                "scalar" => assert_eq!(value.as_str(), Some(format!("item-{index}&more").as_str())),
+                "enum" => assert_eq!(value.as_str(), Some("Ready")),
+                "pattern" => assert_eq!(
+                    value.as_str(),
+                    Some(format!("ABC{:03}", index % 1000).as_str())
+                ),
+                "nested" => assert_eq!(
+                    value.get("value").and_then(PolyValue::as_str),
+                    Some(format!("item-{index}").as_str())
+                ),
+                _ => unreachable!(),
+            }
+        }
+    }
+    let output = serialize("Root", &value, &schema, None).unwrap();
+    let reparsed = deserialize(&output, Arc::clone(&schema)).unwrap();
+    if kind == "text" {
+        // XML writers coalesce adjacent text segments. Compare their text value
+        // rather than treating the reader's segmentation as XML semantics.
+        let text = |value: &PolyValue| -> String {
+            value
+                .get(items_name)
+                .unwrap()
+                .as_list()
+                .unwrap()
+                .iter()
+                .map(|item| item.get("value").unwrap().as_str().unwrap())
+                .collect()
+        };
+        assert_eq!(text(&value), text(&reparsed));
+    } else {
+        assert_eq!(value, reparsed);
+    }
+    (schema, xml.into_bytes())
+}
+
+fn benchmarks(c: &mut Criterion) {
+    for operation in ["mixed_read", "mixed_write"] {
+        let mut group = c.benchmark_group(operation);
+        group.sampling_mode(SamplingMode::Flat);
+        for kind in ["text", "scalar", "enum", "pattern", "nested"] {
+            let (schema, xml) = fixture(kind, 1000);
+            let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+            group.throughput(Throughput::Bytes(xml.len() as u64));
+            group.bench_function(BenchmarkId::new(kind, 1000), |b| {
+                if operation == "mixed_read" {
+                    b.iter(|| {
+                        black_box(deserialize(black_box(&xml), Arc::clone(&schema)).unwrap())
+                    });
+                } else {
+                    b.iter(|| {
+                        black_box(serialize("Root", black_box(&value), &schema, None).unwrap())
+                    });
+                }
+            });
+        }
+        group.finish();
+    }
+}
+criterion_group!(benches, benchmarks);
+criterion_main!(benches);
diff --git a/benchmarks/rust-runtime-investigation/mixed_branches.rs b/benchmarks/rust-runtime-investigation/mixed_branches.rs
new file mode 100644
index 0000000..e635bfe
--- /dev/null
+++ b/benchmarks/rust-runtime-investigation/mixed_branches.rs
@@ -0,0 +1,74 @@
+use criterion::{
+    criterion_group, criterion_main, BenchmarkId, Criterion, SamplingMode, Throughput,
+};
+use polyxml::schema::ModelSchema;
+use polyxml::schema_parser::XsdParser;
+use polyxml::{deserialize, serialize, PolyValue};
+use std::{hint::black_box, sync::Arc};
+
+fn fixture(branches: usize, count: usize) -> (Arc<ModelSchema>, Vec<u8>) {
+    let declarations = (0..branches)
+        .map(|i| format!(r#"<xs:element name="B{i}" type="xs:int"/>"#))
+        .collect::<String>();
+    let xsd = format!(
+        r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"><xs:element name="Root"><xs:complexType mixed="true"><xs:choice minOccurs="0" maxOccurs="unbounded">{declarations}</xs:choice></xs:complexType></xs:element></xs:schema>"#
+    );
+    let ir = XsdParser::new().parse_str(&xsd).unwrap();
+    let schema = ModelSchema::from_ir(&ir, Some("Root")).unwrap();
+    let body = (0..count)
+        .map(|i| format!("<B{}>{i}</B{}>", i % branches, i % branches))
+        .collect::<String>();
+    let xml = format!("<Root>{body}</Root>").into_bytes();
+    let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+    let mixed = schema.mixed_content.as_ref().unwrap();
+    let field = &schema.fields[mixed.items_index].name;
+    let items = value.get(field).and_then(PolyValue::as_list).unwrap();
+    assert_eq!(items.len(), count);
+    for (i, item) in items.iter().enumerate() {
+        assert_eq!(item.get("value"), Some(&PolyValue::Int(i as i64)));
+        let kind = item.get("kind").and_then(PolyValue::as_str).unwrap();
+        let branch = mixed
+            .branches
+            .iter()
+            .find(|b| b.variant_name == kind)
+            .unwrap();
+        assert_eq!(branch.xml_name, format!("B{}", i % branches).as_bytes());
+    }
+    let output = serialize("Root", &value, &schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    (schema, xml)
+}
+
+fn benchmarks(c: &mut Criterion) {
+    for operation in ["branch_read", "branch_write"] {
+        let mut group = c.benchmark_group(operation);
+        group.sampling_mode(SamplingMode::Flat);
+        for branches in [1, 16, 64, 256] {
+            for count in [1, 32, 64, 128, 1000, 1024] {
+                let (schema, xml) = fixture(branches, count);
+                let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+                group.throughput(Throughput::Bytes(xml.len() as u64));
+                group.bench_with_input(
+                    BenchmarkId::new(format!("branches_{branches}"), count),
+                    &count,
+                    |b, _| {
+                        b.iter(|| {
+                            if operation == "branch_read" {
+                                black_box(
+                                    deserialize(black_box(&xml), Arc::clone(&schema)).unwrap(),
+                                );
+                            } else {
+                                black_box(
+                                    serialize("Root", black_box(&value), &schema, None).unwrap(),
+                                );
+                            }
+                        });
+                    },
+                );
+            }
+        }
+        group.finish();
+    }
+}
+criterion_group!(benches, benchmarks);
+criterion_main!(benches);
diff --git a/crates/polyxml-core/src/codegen/cpp/mod.rs b/crates/polyxml-core/src/codegen/cpp/mod.rs
index 7ed29cc..da235e8 100644
--- a/crates/polyxml-core/src/codegen/cpp/mod.rs
+++ b/crates/polyxml-core/src/codegen/cpp/mod.rs
@@ -553,7 +553,14 @@ endif()
                         } else {
                             ""
                         };
-                        writeln!(out, "        {:?}, T::{}{}", v.value, var_name, comma).unwrap();
+                        writeln!(
+                            out,
+                            "        {}, T::{}{}",
+                            super::cpp_string_literal(&v.value),
+                            var_name,
+                            comma
+                        )
+                        .unwrap();
                     }
                     writeln!(out, "    );").unwrap();
                 }
@@ -790,8 +797,10 @@ inline int polyxml_integer_compare(std::string_view a,std::string_view b) noexce
             for (variant, var_name) in enum_def.variants.iter().zip(&variant_names) {
                 writeln!(
                     out,
-                    "        case {}::{}: return \"{}\";",
-                    enum_name, var_name, variant.value
+                    "        case {}::{}: return {};",
+                    enum_name,
+                    var_name,
+                    super::cpp_string_literal(&variant.value)
                 )
                 .unwrap();
             }
@@ -818,8 +827,10 @@ inline int polyxml_integer_compare(std::string_view a,std::string_view b) noexce
             for (variant, var_name) in enum_def.variants.iter().zip(&variant_names) {
                 writeln!(
                     out,
-                    "    if (s == \"{}\") return {}::{};",
-                    variant.value, enum_name, var_name
+                    "    if (s == {}) return {}::{};",
+                    super::cpp_string_literal(&variant.value),
+                    enum_name,
+                    var_name
                 )
                 .unwrap();
             }
@@ -998,7 +1009,9 @@ inline int polyxml_integer_compare(std::string_view a,std::string_view b) noexce
             // Value field
             let init = match &f.default_value {
                 Some(v) => match f.type_ref {
-                    TypeRef::Primitive(p) if p.is_unbounded_integer() => format!(" = {v:?}"),
+                    TypeRef::Primitive(p) if p.is_unbounded_integer() => {
+                        format!(" = {}", super::cpp_string_literal(v))
+                    }
                     TypeRef::Primitive(PrimitiveType::Boolean) => {
                         format!(" = {}", v.to_lowercase())
                     }
@@ -1008,7 +1021,7 @@ inline int polyxml_integer_compare(std::string_view a,std::string_view b) noexce
                     TypeRef::Primitive(PrimitiveType::String)
                     | TypeRef::Primitive(PrimitiveType::Token)
                     | TypeRef::Primitive(PrimitiveType::NormalizedString) => {
-                        format!(" = \"{}\"", v.replace('\\', "\\\\").replace('"', "\\\""))
+                        format!(" = {}", super::cpp_string_literal(v))
                     }
                     TypeRef::Primitive(_) => format!(" = {}", v),
                     TypeRef::Named(_) => format!(" = {}", v),
diff --git a/crates/polyxml-core/src/codegen/csharp/mod.rs b/crates/polyxml-core/src/codegen/csharp/mod.rs
index f15ae04..05153f4 100644
--- a/crates/polyxml-core/src/codegen/csharp/mod.rs
+++ b/crates/polyxml-core/src/codegen/csharp/mod.rs
@@ -618,7 +618,13 @@ impl CSharpCodegen {
                 self.emit_docstring(out, doc, &format!("{}    ", indent));
             }
             if self.options.emit_xml_attributes {
-                writeln!(out, "{}    [XmlEnum(\"{}\")]", indent, variant.value).unwrap();
+                writeln!(
+                    out,
+                    "{}    [XmlEnum({})]",
+                    indent,
+                    super::string_literal(&variant.value)
+                )
+                .unwrap();
             }
             writeln!(out, "{}    {},", indent, variant_name).unwrap();
         }
@@ -659,8 +665,11 @@ impl CSharpCodegen {
         for (variant, variant_name) in e.variants.iter().zip(&variant_names) {
             writeln!(
                 out,
-                "{}        {}.{} => \"{}\",",
-                indent, enum_name, variant_name, variant.value
+                "{}        {}.{} => {},",
+                indent,
+                enum_name,
+                variant_name,
+                super::string_literal(&variant.value)
             )
             .unwrap();
         }
@@ -1295,10 +1304,10 @@ impl CSharpCodegen {
             if let Some(kind) = integer_kind {
                 return format!("PolyxmlIntegerLexical.Validate({text},{kind})");
             }
-            format!("({base})new XmlSerializer(typeof({base}), new XmlRootAttribute(\"value\")).Deserialize(new System.IO.StringReader(\"<value>\" + System.Security.SecurityElement.Escape({text}) + \"</value>\"))!")
+            format!("({base})new XmlSerializer(typeof({base}), new XmlRootAttribute(\"value\")).Deserialize(new System.IO.StringReader(\"<value>\" + System.Security.SecurityElement.Escape({text}).Replace(\"\\r\", \"&#13;\") + \"</value>\"))!")
         };
         if let Some(fixed) = &field.fixed_value {
-            let expected = parse(&format!("{fixed:?}"));
+            let expected = parse(&super::string_literal(fixed));
             let initial = if field.cardinality.is_optional() && field.kind == FieldKind::Element {
                 "default!".to_string()
             } else {
@@ -1318,7 +1327,7 @@ impl CSharpCodegen {
 {indent}    [XmlIgnore] public {ty} {name} {{ get => _{name}; set {{ if ({present}!({equal})) throw new System.ComponentModel.DataAnnotations.ValidationException(\"Fixed value constraint violated for {name}\"); _{name} = value; }} }}").unwrap();
         } else {
             let initial = if field.kind == FieldKind::Attribute {
-                parse(&format!("{default:?}"))
+                parse(&super::string_literal(default))
             } else {
                 "default!".to_string()
             };
@@ -1352,7 +1361,10 @@ impl CSharpCodegen {
         let text = if field.kind == FieldKind::Attribute {
             "value".into()
         } else {
-            format!("value.Length == 0 ? {default:?} : value")
+            format!(
+                "value.Length == 0 ? {} : value",
+                super::string_literal(default)
+            )
         };
         let parsed = parse("text");
         writeln!(out, "{indent}        set {{ if (value is null) {{ {name} = default!; return; }} var text = {text}; {name} = {parsed}; }}
diff --git a/crates/polyxml-core/src/codegen/go/mod.rs b/crates/polyxml-core/src/codegen/go/mod.rs
index 321d4b4..825d3b0 100644
--- a/crates/polyxml-core/src/codegen/go/mod.rs
+++ b/crates/polyxml-core/src/codegen/go/mod.rs
@@ -577,7 +577,7 @@ func (v {type_name}) MarshalText() ([]byte,error) {{ tokens:=make([]string,0,len
                         let variants = enumeration
                             .variants
                             .iter()
-                            .map(|v| format!("{:?}", v.value))
+                            .map(|v| super::string_literal(&v.value))
                             .collect::<Vec<_>>()
                             .join(",");
                         writeln!(out,"switch string(value) {{case {variants}: default:return fmt.Errorf(\"invalid enum list item\")}}").unwrap();
@@ -670,8 +670,10 @@ func (v {type_name}) MarshalText() ([]byte,error) {{ tokens:=make([]string,0,len
             }
             writeln!(
                 out,
-                "    {} {} = \"{}\"",
-                const_name, enum_name, variant.value
+                "    {} {} = {}",
+                const_name,
+                enum_name,
+                super::string_literal(&variant.value)
             )
             .unwrap();
         }
@@ -925,7 +927,7 @@ func (v {type_name}) MarshalText() ([]byte,error) {{ tokens:=make([]string,0,len
                     let comparisons = def
                         .variants
                         .iter()
-                        .map(|v| format!("value == {:?}", v.value))
+                        .map(|v| format!("value == {}", super::string_literal(&v.value)))
                         .collect::<Vec<_>>()
                         .join(" || ");
                     let _ = writeln!(
diff --git a/crates/polyxml-core/src/codegen/java/mod.rs b/crates/polyxml-core/src/codegen/java/mod.rs
index 5ab5ee3..aa22279 100644
--- a/crates/polyxml-core/src/codegen/java/mod.rs
+++ b/crates/polyxml-core/src/codegen/java/mod.rs
@@ -597,8 +597,11 @@ impl JavaCodegen {
             let semi_or_comma = if i + 1 == e.variants.len() { ";" } else { "," };
             let _ = writeln!(
                 out,
-                "{}    {}({:?}){}",
-                indent, const_name, v.value, semi_or_comma
+                "{}    {}({}){}",
+                indent,
+                const_name,
+                super::string_literal(&v.value),
+                semi_or_comma
             );
         }
 
diff --git a/crates/polyxml-core/src/codegen/mod.rs b/crates/polyxml-core/src/codegen/mod.rs
index 9e35479..6ae0135 100644
--- a/crates/polyxml-core/src/codegen/mod.rs
+++ b/crates/polyxml-core/src/codegen/mod.rs
@@ -24,6 +24,40 @@ pub use python::{
 pub use rust::{RustCodegen, RustOptions};
 pub use typescript::{TypeScriptBackend, TypeScriptCodegen, TypeScriptOptions};
 
+/// JSON string escapes are also valid in Python, Go, Java, C# and TypeScript
+/// string literals. Rust and C++ need their own escapes for control characters.
+pub(crate) fn string_literal(value: &str) -> String {
+    serde_json::to_string(value)
+        .expect("serializing a string cannot fail")
+        // C# treats these Unicode characters as source line terminators even
+        // inside quoted strings; JSON permits their literal forms.
+        .replace('\u{85}', "\\u0085")
+        .replace('\u{2028}', "\\u2028")
+        .replace('\u{2029}', "\\u2029")
+}
+
+pub(crate) fn cpp_string_literal(value: &str) -> String {
+    use std::fmt::Write;
+    let mut literal = String::from("\"");
+    for character in value.chars() {
+        match character {
+            '\\' => literal.push_str("\\\\"),
+            '"' => literal.push_str("\\\""),
+            '\n' => literal.push_str("\\n"),
+            '\r' => literal.push_str("\\r"),
+            '\t' => literal.push_str("\\t"),
+            c if c.is_ascii_control() => {
+                // Three octal digits prevent a following digit from extending
+                // the escape; universal character names cannot encode these.
+                write!(literal, "\\{:03o}", c as u32).unwrap();
+            }
+            c => literal.push(c),
+        }
+    }
+    literal.push('"');
+    literal
+}
+
 /// Prefix every physical XSD documentation line so embedded newlines cannot
 /// escape a generated source comment.
 pub(crate) fn write_documentation_lines(out: &mut String, prefix: &str, doc: &str) {
diff --git a/crates/polyxml-core/src/codegen/python/mod.rs b/crates/polyxml-core/src/codegen/python/mod.rs
index 4c182fb..11b6d27 100644
--- a/crates/polyxml-core/src/codegen/python/mod.rs
+++ b/crates/polyxml-core/src/codegen/python/mod.rs
@@ -521,9 +521,9 @@ impl PythonCodegen {
 
             let _ = writeln!(
                 out,
-                "    {} = \"{}\"",
+                "    {} = {}",
                 var_id,
-                variant.value.replace('"', "\\\"")
+                super::string_literal(&variant.value)
             );
         }
     }
@@ -1012,10 +1012,10 @@ impl PythonCodegen {
         }
 
         if let Some(ref fixed) = field.fixed_value {
-            parts.push(format!("\"fixed\": {fixed:?}"));
+            parts.push(format!("\"fixed\": {}", super::string_literal(fixed)));
         }
         if let Some(ref default) = field.default_value {
-            parts.push(format!("\"default\": {default:?}"));
+            parts.push(format!("\"default\": {}", super::string_literal(default)));
         }
         if matches!(super::primitive_base(&field.type_ref, ir), TypeRef::List(_)) {
             parts.push("\"tokens\": True".into());
@@ -1045,7 +1045,7 @@ impl PythonCodegen {
     fn format_default_value(&self, val: &str, type_ref: &TypeRef, ir: &SchemaIR) -> String {
         if matches!(super::primitive_base(type_ref, ir), TypeRef::Primitive(p) if p.is_unbounded_integer())
         {
-            return format!("int({val:?})");
+            return format!("int({})", super::string_literal(val));
         }
 
         let base = super::primitive_base(type_ref, ir);
@@ -1073,20 +1073,20 @@ impl PythonCodegen {
                 if val.trim().parse::<i64>().is_ok() {
                     val.trim().to_string()
                 } else {
-                    format!("\"{}\"", val.replace('"', "\\\""))
+                    super::string_literal(val)
                 }
             }
             TypeRef::Primitive(PrimitiveType::Float | PrimitiveType::Double) => {
                 if val.trim().parse::<f64>().is_ok() {
                     val.trim().to_string()
                 } else {
-                    format!("\"{}\"", val.replace('"', "\\\""))
+                    super::string_literal(val)
                 }
             }
             TypeRef::Primitive(PrimitiveType::Decimal) => {
-                format!("Decimal(\"{}\")", val.replace('"', "\\\""))
+                format!("Decimal({})", super::string_literal(val))
             }
-            _ => format!("\"{}\"", val.replace('"', "\\\"")),
+            _ => super::string_literal(val),
         }
     }
 
diff --git a/crates/polyxml-core/src/codegen/rust/mod.rs b/crates/polyxml-core/src/codegen/rust/mod.rs
index 6a13123..f4d1722 100644
--- a/crates/polyxml-core/src/codegen/rust/mod.rs
+++ b/crates/polyxml-core/src/codegen/rust/mod.rs
@@ -724,7 +724,7 @@ impl RustCodegen {
                 write_documentation_lines(out, "    /// ", doc);
             }
             if self.options.derive_serde {
-                let _ = writeln!(out, "    #[serde(rename = \"{}\")]", variant.value);
+                let _ = writeln!(out, "    #[serde(rename = {:?})]", variant.value);
             }
             if self.options.derive_default && idx == 0 {
                 let _ = writeln!(out, "    #[default]");
@@ -740,7 +740,7 @@ impl RustCodegen {
         out.push_str("    pub fn as_str(&self) -> &'static str {\n");
         out.push_str("        match self {\n");
         for (var_id, val) in &variant_map {
-            let _ = writeln!(out, "            Self::{} => \"{}\",", var_id, val);
+            let _ = writeln!(out, "            Self::{} => {:?},", var_id, val);
         }
         if variant_map.is_empty() {
             out.push_str("            _ => \"\",\n");
@@ -755,7 +755,7 @@ impl RustCodegen {
         out.push_str("    fn from_str(s: &str) -> std::result::Result<Self, Self::Err> {\n");
         out.push_str("        match s {\n");
         for (var_id, val) in &variant_map {
-            let _ = writeln!(out, "            \"{}\" => Ok(Self::{}),", val, var_id);
+            let _ = writeln!(out, "            {:?} => Ok(Self::{}),", val, var_id);
         }
         let _ = writeln!(
             out,
@@ -844,7 +844,7 @@ impl RustCodegen {
                 write_documentation_lines(out, "    /// ", doc);
             }
             if self.options.derive_serde && !u.is_lexical() {
-                let _ = writeln!(out, "    #[serde(rename = \"{}\")]", branch.xml_name);
+                let _ = writeln!(out, "    #[serde(rename = {:?})]", branch.xml_name);
             }
             if self.options.emit_polyxml_attrs && !u.is_lexical() {
                 let _ = writeln!(out, "    #[polyxml(element = \"{}\")]", branch.xml_name);
diff --git a/crates/polyxml-core/src/codegen/typescript/mod.rs b/crates/polyxml-core/src/codegen/typescript/mod.rs
index b01b75a..04812ed 100644
--- a/crates/polyxml-core/src/codegen/typescript/mod.rs
+++ b/crates/polyxml-core/src/codegen/typescript/mod.rs
@@ -422,7 +422,12 @@ impl TypeScriptCodegen {
         let mut seen = HashSet::new();
         for v in &e.variants {
             let variant_key = self.unique_variant_name(&v.name, &mut seen);
-            let _ = writeln!(out, "  {}: {:?},", variant_key, v.value);
+            let _ = writeln!(
+                out,
+                "  {}: {},",
+                variant_key,
+                super::string_literal(&v.value)
+            );
         }
         out.push_str("} as const;\n\n");
 
@@ -437,7 +442,7 @@ impl TypeScriptCodegen {
         let literals = e
             .variants
             .iter()
-            .map(|v| format!("{:?}", v.value))
+            .map(|v| super::string_literal(&v.value))
             .collect::<Vec<_>>()
             .join(", ");
 
@@ -461,7 +466,7 @@ impl TypeScriptCodegen {
                 let tb_literals = e
                     .variants
                     .iter()
-                    .map(|v| format!("Type.Literal({:?})", v.value))
+                    .map(|v| format!("Type.Literal({})", super::string_literal(&v.value)))
                     .collect::<Vec<_>>()
                     .join(", ");
                 let _ = writeln!(
diff --git a/crates/polyxml-core/src/parser.rs b/crates/polyxml-core/src/parser.rs
index afc027e..e6fe150 100644
--- a/crates/polyxml-core/src/parser.rs
+++ b/crates/polyxml-core/src/parser.rs
@@ -171,21 +171,23 @@ fn is_nil_element(e: &BytesStart) -> bool {
 
 /// Extend inherited namespace bindings for this element. Elements without
 /// declarations share the existing map.
-fn namespace_scope(parent: &NamespaceScope, e: &BytesStart) -> NamespaceScope {
+fn namespace_scope(parent: &NamespaceScope, e: &BytesStart) -> Result<NamespaceScope> {
     let mut scope = None;
     for attr in e.attributes().flatten() {
         let key = attr.key.as_ref();
         if key == "xmlns" {
-            scope
-                .get_or_insert_with(|| (**parent).clone())
-                .insert(String::new(), attr.value.as_ref().to_string());
+            scope.get_or_insert_with(|| (**parent).clone()).insert(
+                String::new(),
+                quick_xml::escape::unescape(attr.value.as_ref())?.into_owned(),
+            );
         } else if let Some(prefix) = key.strip_prefix("xmlns:") {
-            scope
-                .get_or_insert_with(|| (**parent).clone())
-                .insert(prefix.to_string(), attr.value.as_ref().to_string());
+            scope.get_or_insert_with(|| (**parent).clone()).insert(
+                prefix.to_string(),
+                quick_xml::escape::unescape(attr.value.as_ref())?.into_owned(),
+            );
         }
     }
-    scope.map(Arc::new).unwrap_or_else(|| Arc::clone(parent))
+    Ok(scope.map(Arc::new).unwrap_or_else(|| Arc::clone(parent)))
 }
 
 /// Raw unescaped value of the type attribute in the XML Schema Instance
@@ -342,7 +344,7 @@ pub const DEFAULT_MAX_DEPTH: usize = 256;
 impl XmlDeserializer {
     fn check_root(start: &BytesStart, schema: &ModelSchema) -> Result<()> {
         if schema.strict_root {
-            let scope = namespace_scope(&Arc::new(HashMap::new()), start);
+            let scope = namespace_scope(&Arc::new(HashMap::new()), start)?;
             let (ns, local) = resolve_element_qname(start, &scope);
             if local.as_bytes() != schema.xml_name
                 || ns.as_deref().filter(|s| !s.is_empty())
@@ -384,7 +386,7 @@ impl XmlDeserializer {
                 }
                 Ok(Event::Empty(ref e)) => {
                     Self::check_root(e, &root_schema)?;
-                    let scope = namespace_scope(&Arc::new(HashMap::new()), e);
+                    let scope = namespace_scope(&Arc::new(HashMap::new()), e)?;
                     let schema = resolve_record_schema(&root_schema, e, &scope)?;
                     let mut frame = StackFrame::new(schema);
                     Self::parse_attributes(e, &mut frame)?;
@@ -415,7 +417,7 @@ impl XmlDeserializer {
         inherited_scope: &NamespaceScope,
     ) -> Result<PolyValue> {
         let mut stack: Vec<StackFrame> = Vec::with_capacity(16);
-        let mut namespace_stack = vec![namespace_scope(inherited_scope, root_start)];
+        let mut namespace_stack = vec![namespace_scope(inherited_scope, root_start)?];
         let root_schema =
             resolve_record_schema(&root_schema, root_start, namespace_stack.last().unwrap())?;
         let mut root_frame = StackFrame::new(root_schema);
@@ -431,7 +433,7 @@ impl XmlDeserializer {
         loop {
             match reader.read_event_into(&mut buf) {
                 Ok(Event::Start(ref e)) => {
-                    namespace_stack.push(namespace_scope(namespace_stack.last().unwrap(), e));
+                    namespace_stack.push(namespace_scope(namespace_stack.last().unwrap(), e)?);
                     if unknown_depth > 0 {
                         unknown_depth += 1;
                         continue;
@@ -626,11 +628,11 @@ impl XmlDeserializer {
                         continue;
                     }
                     if any_stack.is_empty() {
-                        let scope = namespace_scope(namespace_stack.last().unwrap(), e);
+                        let scope = namespace_scope(namespace_stack.last().unwrap(), e)?;
                         record_content_token(stack.last_mut().unwrap(), e, &scope);
                     }
                     if !any_stack.is_empty() {
-                        let scope = namespace_scope(namespace_stack.last().unwrap(), e);
+                        let scope = namespace_scope(namespace_stack.last().unwrap(), e)?;
                         let (ns, local) = resolve_element_qname(e, &scope);
                         let qname = if let Some(uri) = ns {
                             format!("{{{}}}{}", uri, local)
@@ -651,7 +653,7 @@ impl XmlDeserializer {
                         continue;
                     }
                     let local_name = e.local_name();
-                    let scope = namespace_scope(namespace_stack.last().unwrap(), e);
+                    let scope = namespace_scope(namespace_stack.last().unwrap(), e)?;
                     let is_nil = is_nil_element(e);
 
                     let current_schema = Arc::clone(&stack.last().unwrap().schema);
@@ -1085,7 +1087,7 @@ impl<R: std::io::BufRead> XmlItemStream<R> {
                         .last()
                         .cloned()
                         .unwrap_or_else(|| Arc::new(HashMap::new()));
-                    self.namespace_stack.push(namespace_scope(&inherited, e));
+                    self.namespace_stack.push(namespace_scope(&inherited, e)?);
                 }
                 Ok(Event::Empty(ref e)) => {
                     let local = e.local_name();
@@ -1097,7 +1099,7 @@ impl<R: std::io::BufRead> XmlItemStream<R> {
                             .last()
                             .cloned()
                             .unwrap_or_else(|| Arc::new(HashMap::new()));
-                        let scope = namespace_scope(&inherited, e);
+                        let scope = namespace_scope(&inherited, e)?;
                         let schema = resolve_record_schema(&self.schema, e, &scope)?;
                         let mut frame = StackFrame::new(schema);
                         XmlDeserializer::parse_attributes(e, &mut frame)?;
diff --git a/crates/polyxml-core/src/schema_parser/mod.rs b/crates/polyxml-core/src/schema_parser/mod.rs
index 1c7e870..42b0b7b 100644
--- a/crates/polyxml-core/src/schema_parser/mod.rs
+++ b/crates/polyxml-core/src/schema_parser/mod.rs
@@ -233,9 +233,11 @@ impl XsdParser {
                     let name = e.name().into_inner();
                     let local = strip_prefix(name);
                     if local == "schema" {
-                        for attr in e.attributes().flatten() {
+                        for attr in e.attributes() {
+                            let attr =
+                                attr.map_err(|error| SchemaError::Malformed(error.to_string()))?;
                             let key = attr.key.as_ref();
-                            let val = attr.value.as_ref();
+                            let val = attr.normalized_value(quick_xml::XmlVersion::Implicit1_0)?;
 
                             if key == "targetNamespace" {
                                 target_namespace = Some(val.to_string());
@@ -267,7 +269,7 @@ impl XsdParser {
 
                     match local {
                         "include" | "redefine" => {
-                            if let Some(schema_location) = get_attr_value(e, "schemaLocation") {
+                            if let Some(schema_location) = get_attr_value(e, "schemaLocation")? {
                                 if let Some(dir) = base_dir {
                                     let inc_path = dir.join(&schema_location);
                                     if inc_path.exists() {
@@ -299,7 +301,7 @@ impl XsdParser {
                             }
                         }
                         "import" => {
-                            if let Some(schema_location) = get_attr_value(e, "schemaLocation") {
+                            if let Some(schema_location) = get_attr_value(e, "schemaLocation")? {
                                 if let Some(dir) = base_dir {
                                     let imp_path = dir.join(&schema_location);
                                     if imp_path.exists() {
@@ -341,7 +343,7 @@ impl XsdParser {
                                 &prefixes,
                                 &mut ir,
                             )? {
-                                if get_attr_value(e, "abstract")
+                                if get_attr_value(e, "abstract")?
                                     .is_some_and(|value| value == "true" || value == "1")
                                 {
                                     ir.abstract_elements.insert(elem_def.qname.clone());
@@ -360,7 +362,7 @@ impl XsdParser {
                         }
                         "group" => {
                             // Named model group definition.
-                            if let Some(gname) = get_attr_value(e, "name") {
+                            if let Some(gname) = get_attr_value(e, "name")? {
                                 let gq = QName::new(target_namespace.as_deref(), gname);
                                 let def = self.parse_group_body(
                                     &mut reader,
@@ -381,7 +383,7 @@ impl XsdParser {
 
                     match local {
                         "include" | "redefine" => {
-                            if let Some(schema_location) = get_attr_value(e, "schemaLocation") {
+                            if let Some(schema_location) = get_attr_value(e, "schemaLocation")? {
                                 if let Some(dir) = base_dir {
                                     let inc_path = dir.join(&schema_location);
                                     if inc_path.exists() {
@@ -413,7 +415,7 @@ impl XsdParser {
                             }
                         }
                         "import" => {
-                            if let Some(schema_location) = get_attr_value(e, "schemaLocation") {
+                            if let Some(schema_location) = get_attr_value(e, "schemaLocation")? {
                                 if let Some(dir) = base_dir {
                                     let imp_path = dir.join(&schema_location);
                                     if imp_path.exists() {
@@ -428,8 +430,8 @@ impl XsdParser {
                                 e,
                                 target_namespace.as_deref(),
                                 &prefixes,
-                            ) {
-                                if get_attr_value(e, "abstract")
+                            )? {
+                                if get_attr_value(e, "abstract")?
                                     .is_some_and(|value| value == "true" || value == "1")
                                 {
                                     ir.abstract_elements.insert(elem_def.qname.clone());
@@ -438,8 +440,8 @@ impl XsdParser {
                             }
                         }
                         "attribute" => {
-                            if let Some(name) = get_attr_value(e, "name") {
-                                let type_ref = get_attr_value(e, "type")
+                            if let Some(name) = get_attr_value(e, "name")? {
+                                let type_ref = get_attr_value(e, "type")?
                                     .map(|ty| {
                                         resolve_type_ref(
                                             &ty,
@@ -455,14 +457,14 @@ impl XsdParser {
                         }
                         "group" => {
                             // Empty named model group (no particles).
-                            if let Some(gname) = get_attr_value(e, "name") {
+                            if let Some(gname) = get_attr_value(e, "name")? {
                                 let gq = QName::new(target_namespace.as_deref(), gname);
                                 self.groups.insert(gq, GroupDef::default());
                             }
                         }
                         "complexType" => {
-                            if let Some(name) = get_attr_value(e, "name") {
-                                let is_abstract = get_attr_value(e, "abstract")
+                            if let Some(name) = get_attr_value(e, "name")? {
+                                let is_abstract = get_attr_value(e, "abstract")?
                                     .map(|v| v == "true" || v == "1")
                                     .unwrap_or(false);
                                 let qname = QName::new(target_namespace.as_deref(), name);
@@ -470,7 +472,7 @@ impl XsdParser {
                                     qname,
                                     base_type: None,
                                     is_abstract,
-                                    is_mixed: get_attr_value(e, "mixed")
+                                    is_mixed: get_attr_value(e, "mixed")?
                                         .is_some_and(|value| value == "true" || value == "1"),
                                     fields: Vec::new(),
                                     documentation: None,
@@ -478,7 +480,7 @@ impl XsdParser {
                             }
                         }
                         "simpleType" => {
-                            if let Some(name) = get_attr_value(e, "name") {
+                            if let Some(name) = get_attr_value(e, "name")? {
                                 let qname = QName::new(target_namespace.as_deref(), name);
                                 ir.add_type(TypeDef::Simple(Box::new(SimpleTypeDef {
                                     qname,
@@ -512,16 +514,16 @@ impl XsdParser {
         name_override: Option<String>,
         ir: &mut SchemaIR,
     ) -> Result<Option<TypeDef>, SchemaError> {
-        let name = match get_attr_value(start, "name").or(name_override) {
+        let name = match get_attr_value(start, "name")?.or(name_override) {
             Some(n) => n,
             None => return Ok(None), // Anonymous type handled in place
         };
 
-        let is_abstract = get_attr_value(start, "abstract")
+        let is_abstract = get_attr_value(start, "abstract")?
             .map(|v| v == "true" || v == "1")
             .unwrap_or(false);
         let is_mixed =
-            get_attr_value(start, "mixed").is_some_and(|value| value == "true" || value == "1");
+            get_attr_value(start, "mixed")?.is_some_and(|value| value == "true" || value == "1");
 
         let qname = QName::new(target_ns, name.clone());
         if !is_mixed {
@@ -564,7 +566,7 @@ impl XsdParser {
                             in_simple_content = true;
                         }
                         "restriction" if in_simple_content => {
-                            if let Some(base) = get_attr_value(e, "base") {
+                            if let Some(base) = get_attr_value(e, "base")? {
                                 let resolved = resolve_qname(&base, target_ns, prefixes);
                                 if resolved != qname {
                                     base_type = Some(resolved);
@@ -576,7 +578,7 @@ impl XsdParser {
                             }
                         }
                         "extension" => {
-                            if let Some(base) = get_attr_value(e, "base") {
+                            if let Some(base) = get_attr_value(e, "base")? {
                                 let resolved = resolve_qname(&base, target_ns, prefixes);
                                 if resolved != qname {
                                     base_type = Some(resolved);
@@ -591,7 +593,7 @@ impl XsdParser {
                         }
                         "group" => {
                             // Named model group particle; expanded post-parse.
-                            if let Some(r) = get_attr_value(e, "ref") {
+                            if let Some(r) = get_attr_value(e, "ref")? {
                                 group_refs
                                     .push((fields.len(), resolve_qname(&r, target_ns, prefixes)));
                             }
@@ -599,13 +601,13 @@ impl XsdParser {
                             depth -= 1;
                         }
                         "sequence" | "all" => {
-                            let is_unbounded = get_attr_value(e, "maxOccurs")
+                            let is_unbounded = get_attr_value(e, "maxOccurs")?
                                 .map(|v| {
                                     v == "unbounded"
                                         || v.parse::<u32>().map(|n| n > 1).unwrap_or(false)
                                 })
                                 .unwrap_or(false);
-                            let min_occurs = get_attr_value(e, "minOccurs")
+                            let min_occurs = get_attr_value(e, "minOccurs")?
                                 .and_then(|v| v.parse::<usize>().ok())
                                 .unwrap_or(1);
                             compositor_stack.push(CompositorFrame {
@@ -622,13 +624,13 @@ impl XsdParser {
                             });
                         }
                         "choice" => {
-                            let is_unbounded = get_attr_value(e, "maxOccurs")
+                            let is_unbounded = get_attr_value(e, "maxOccurs")?
                                 .map(|v| {
                                     v == "unbounded"
                                         || v.parse::<u32>().map(|n| n > 1).unwrap_or(false)
                                 })
                                 .unwrap_or(false);
-                            let min_occurs = get_attr_value(e, "minOccurs")
+                            let min_occurs = get_attr_value(e, "minOccurs")?
                                 .and_then(|v| v.parse::<usize>().ok())
                                 .unwrap_or(1);
                             compositor_stack.push(CompositorFrame {
@@ -655,7 +657,7 @@ impl XsdParser {
                                 prefixes,
                                 in_any_choice,
                                 in_unbounded,
-                            ) {
+                            )? {
                                 // Consume inline type definitions so nested
                                 // fields cannot leak into the parent struct;
                                 // extracted types are registered in `ir`.
@@ -680,7 +682,7 @@ impl XsdParser {
                             }
                         }
                         "attribute" => {
-                            if let Some(field) = parse_attribute_field(e, target_ns, prefixes) {
+                            if let Some(field) = parse_attribute_field(e, target_ns, prefixes)? {
                                 fields.push(field);
                             }
                         }
@@ -690,7 +692,7 @@ impl XsdParser {
                                 .last()
                                 .map(|c| c.kind == CompositorKind::Choice)
                                 .unwrap_or(false);
-                            let field = parse_any_field(e, in_choice, in_unbounded);
+                            let field = parse_any_field(e, in_choice, in_unbounded)?;
                             if in_choice {
                                 if let Some(frame) = compositor_stack.last_mut() {
                                     if frame.kind == CompositorKind::Choice {
@@ -721,7 +723,7 @@ impl XsdParser {
                         "extension" | "restriction"
                             if local == "extension" || in_simple_content =>
                         {
-                            if let Some(base) = get_attr_value(e, "base") {
+                            if let Some(base) = get_attr_value(e, "base")? {
                                 let resolved = resolve_qname(&base, target_ns, prefixes);
                                 if resolved != qname {
                                     base_type = Some(resolved);
@@ -735,7 +737,7 @@ impl XsdParser {
                         }
                         "group" => {
                             // Self-closing group reference; expanded post-parse.
-                            if let Some(r) = get_attr_value(e, "ref") {
+                            if let Some(r) = get_attr_value(e, "ref")? {
                                 group_refs
                                     .push((fields.len(), resolve_qname(&r, target_ns, prefixes)));
                             }
@@ -755,7 +757,7 @@ impl XsdParser {
                                 prefixes,
                                 in_any_choice,
                                 in_unbounded,
-                            ) {
+                            )? {
                                 if in_choice {
                                     if let Some(frame) = compositor_stack.last_mut() {
                                         if frame.kind == CompositorKind::Choice {
@@ -773,7 +775,7 @@ impl XsdParser {
                             }
                         }
                         "attribute" => {
-                            if let Some(field) = parse_attribute_field(e, target_ns, prefixes) {
+                            if let Some(field) = parse_attribute_field(e, target_ns, prefixes)? {
                                 fields.push(field);
                             }
                         }
@@ -783,7 +785,7 @@ impl XsdParser {
                                 .last()
                                 .map(|c| c.kind == CompositorKind::Choice)
                                 .unwrap_or(false);
-                            let field = parse_any_field(e, in_choice, in_unbounded);
+                            let field = parse_any_field(e, in_choice, in_unbounded)?;
                             if in_choice {
                                 if let Some(frame) = compositor_stack.last_mut() {
                                     if frame.kind == CompositorKind::Choice {
@@ -1023,16 +1025,16 @@ impl XsdParser {
         field: &mut FieldDef,
         ir: &mut SchemaIR,
     ) -> Result<(), SchemaError> {
-        if get_attr_value(element_start, "type").is_some()
-            || get_attr_value(element_start, "ref").is_some()
+        if get_attr_value(element_start, "type")?.is_some()
+            || get_attr_value(element_start, "ref")?.is_some()
         {
             // Type already specified — discard (illegal) inline content.
             skip_subtree(reader)?;
             return Ok(());
         }
 
-        let elem_local = get_attr_value(element_start, "name")
-            .or_else(|| get_attr_value(element_start, "ref").map(|r| strip_prefix(&r).to_string()))
+        let elem_local = get_attr_value(element_start, "name")?
+            .or(get_attr_value(element_start, "ref")?.map(|r| strip_prefix(&r).to_string()))
             .unwrap_or_else(|| field.name.clone());
 
         let mut extracted = false;
@@ -1122,7 +1124,7 @@ impl XsdParser {
                             if local == "choice" {
                                 in_choice = true;
                             }
-                            let is_unbounded = get_attr_value(e, "maxOccurs")
+                            let is_unbounded = get_attr_value(e, "maxOccurs")?
                                 .map(|v| {
                                     v == "unbounded"
                                         || v.parse::<u32>().map(|n| n > 1).unwrap_or(false)
@@ -1132,9 +1134,13 @@ impl XsdParser {
                         }
                         "element" => {
                             let in_unbounded = compositor_stack.iter().any(|&b| b);
-                            if let Some(mut field) =
-                                parse_element_field(e, target_ns, prefixes, in_choice, in_unbounded)
-                            {
+                            if let Some(mut field) = parse_element_field(
+                                e,
+                                target_ns,
+                                prefixes,
+                                in_choice,
+                                in_unbounded,
+                            )? {
                                 self.consume_inline_element_type(
                                     reader, e, target_ns, prefixes, "", &mut field, ir,
                                 )?;
@@ -1143,7 +1149,7 @@ impl XsdParser {
                             }
                         }
                         "group" => {
-                            if let Some(r) = get_attr_value(e, "ref") {
+                            if let Some(r) = get_attr_value(e, "ref")? {
                                 def.group_refs.push((
                                     def.fields.len(),
                                     resolve_qname(&r, target_ns, prefixes),
@@ -1154,7 +1160,8 @@ impl XsdParser {
                         }
                         "any" => {
                             let in_unbounded = compositor_stack.iter().any(|&b| b);
-                            def.fields.push(parse_any_field(e, in_choice, in_unbounded));
+                            def.fields
+                                .push(parse_any_field(e, in_choice, in_unbounded)?);
                         }
                         _ => {}
                     }
@@ -1164,14 +1171,18 @@ impl XsdParser {
                     match local {
                         "element" => {
                             let in_unbounded = compositor_stack.iter().any(|&b| b);
-                            if let Some(field) =
-                                parse_element_field(e, target_ns, prefixes, in_choice, in_unbounded)
-                            {
+                            if let Some(field) = parse_element_field(
+                                e,
+                                target_ns,
+                                prefixes,
+                                in_choice,
+                                in_unbounded,
+                            )? {
                                 def.fields.push(field);
                             }
                         }
                         "group" => {
-                            if let Some(r) = get_attr_value(e, "ref") {
+                            if let Some(r) = get_attr_value(e, "ref")? {
                                 def.group_refs.push((
                                     def.fields.len(),
                                     resolve_qname(&r, target_ns, prefixes),
@@ -1180,7 +1191,8 @@ impl XsdParser {
                         }
                         "any" => {
                             let in_unbounded = compositor_stack.iter().any(|&b| b);
-                            def.fields.push(parse_any_field(e, in_choice, in_unbounded));
+                            def.fields
+                                .push(parse_any_field(e, in_choice, in_unbounded)?);
                         }
                         _ => {}
                     }
@@ -1209,7 +1221,7 @@ impl XsdParser {
         name_override: Option<String>,
         ir: &mut SchemaIR,
     ) -> Result<Option<TypeDef>, SchemaError> {
-        let name = match get_attr_value(start, "name").or(name_override) {
+        let name = match get_attr_value(start, "name")?.or(name_override) {
             Some(n) => n,
             None => return Ok(None),
         };
@@ -1237,12 +1249,12 @@ impl XsdParser {
                             depth -= 1;
                         }
                         "restriction" => {
-                            if let Some(base) = get_attr_value(e, "base") {
+                            if let Some(base) = get_attr_value(e, "base")? {
                                 base_type = resolve_type_ref(&base, target_ns, prefixes);
                             }
                         }
                         "list" => {
-                            if let Some(item) = get_attr_value(e, "itemType") {
+                            if let Some(item) = get_attr_value(e, "itemType")? {
                                 base_type = TypeRef::List(Box::new(resolve_type_ref(
                                     &item, target_ns, prefixes,
                                 )));
@@ -1251,7 +1263,7 @@ impl XsdParser {
                             }
                         }
                         "union" => {
-                            union_branches = Some(parse_union_members(e, target_ns, prefixes));
+                            union_branches = Some(parse_union_members(e, target_ns, prefixes)?);
                         }
                         "simpleType" if list_requires_inline => {
                             let item_name =
@@ -1299,12 +1311,12 @@ impl XsdParser {
                             depth -= 1;
                         }
                         "pattern" => {
-                            if let Some(val) = get_attr_value(e, "value") {
+                            if let Some(val) = get_attr_value(e, "value")? {
                                 facets.patterns.push(val);
                             }
                         }
                         "enumeration" => {
-                            if let Some(val) = get_attr_value(e, "value") {
+                            if let Some(val) = get_attr_value(e, "value")? {
                                 enum_values.push(EnumValue {
                                     name: sanitize_variant_name(&val),
                                     value: val.clone(),
@@ -1321,12 +1333,12 @@ impl XsdParser {
 
                     match local {
                         "restriction" => {
-                            if let Some(base) = get_attr_value(e, "base") {
+                            if let Some(base) = get_attr_value(e, "base")? {
                                 base_type = resolve_type_ref(&base, target_ns, prefixes);
                             }
                         }
                         "list" => {
-                            if let Some(item) = get_attr_value(e, "itemType") {
+                            if let Some(item) = get_attr_value(e, "itemType")? {
                                 base_type = TypeRef::List(Box::new(resolve_type_ref(
                                     &item, target_ns, prefixes,
                                 )));
@@ -1337,10 +1349,10 @@ impl XsdParser {
                             }
                         }
                         "union" => {
-                            union_branches = Some(parse_union_members(e, target_ns, prefixes));
+                            union_branches = Some(parse_union_members(e, target_ns, prefixes)?);
                         }
                         "enumeration" => {
-                            if let Some(val) = get_attr_value(e, "value") {
+                            if let Some(val) = get_attr_value(e, "value")? {
                                 enum_values.push(EnumValue {
                                     name: sanitize_variant_name(&val),
                                     value: val.clone(),
@@ -1350,43 +1362,44 @@ impl XsdParser {
                             }
                         }
                         "pattern" => {
-                            if let Some(val) = get_attr_value(e, "value") {
+                            if let Some(val) = get_attr_value(e, "value")? {
                                 facets.patterns.push(val);
                             }
                         }
                         "minInclusive" => {
-                            facets.min_inclusive = get_attr_value(e, "value");
+                            facets.min_inclusive = get_attr_value(e, "value")?;
                         }
                         "maxInclusive" => {
-                            facets.max_inclusive = get_attr_value(e, "value");
+                            facets.max_inclusive = get_attr_value(e, "value")?;
                         }
                         "minExclusive" => {
-                            facets.min_exclusive = get_attr_value(e, "value");
+                            facets.min_exclusive = get_attr_value(e, "value")?;
                         }
                         "maxExclusive" => {
-                            facets.max_exclusive = get_attr_value(e, "value");
+                            facets.max_exclusive = get_attr_value(e, "value")?;
                         }
                         "minLength" => {
                             facets.min_length =
-                                get_attr_value(e, "value").and_then(|v| v.parse().ok());
+                                get_attr_value(e, "value")?.and_then(|v| v.parse().ok());
                         }
                         "maxLength" => {
                             facets.max_length =
-                                get_attr_value(e, "value").and_then(|v| v.parse().ok());
+                                get_attr_value(e, "value")?.and_then(|v| v.parse().ok());
                         }
                         "length" => {
-                            facets.length = get_attr_value(e, "value").and_then(|v| v.parse().ok());
+                            facets.length =
+                                get_attr_value(e, "value")?.and_then(|v| v.parse().ok());
                         }
                         "totalDigits" => {
                             facets.total_digits =
-                                get_attr_value(e, "value").and_then(|v| v.parse().ok());
+                                get_attr_value(e, "value")?.and_then(|v| v.parse().ok());
                         }
                         "fractionDigits" => {
                             facets.fraction_digits =
-                                get_attr_value(e, "value").and_then(|v| v.parse().ok());
+                                get_attr_value(e, "value")?.and_then(|v| v.parse().ok());
                         }
                         "whiteSpace" => {
-                            facets.white_space = get_attr_value(e, "value");
+                            facets.white_space = get_attr_value(e, "value")?;
                         }
                         _ => {}
                     }
@@ -1489,10 +1502,10 @@ impl XsdParser {
         prefixes: &HashMap<String, String>,
         ir: &mut SchemaIR,
     ) -> Result<(), SchemaError> {
-        let Some(name) = get_attr_value(start, "name") else {
+        let Some(name) = get_attr_value(start, "name")? else {
             return skip_subtree(reader);
         };
-        let mut type_ref = get_attr_value(start, "type")
+        let mut type_ref = get_attr_value(start, "type")?
             .map(|ty| resolve_type_ref(&ty, target_ns, prefixes))
             .unwrap_or_else(TypeRef::string);
         loop {
@@ -1529,19 +1542,19 @@ impl XsdParser {
         prefixes: &HashMap<String, String>,
         ir: &mut SchemaIR,
     ) -> Result<Option<ElementDef>, SchemaError> {
-        let name = match get_attr_value(start, "name") {
+        let name = match get_attr_value(start, "name")? {
             Some(n) => n,
             None => return Ok(None),
         };
 
         let qname = QName::new(target_ns, name.clone());
-        let substitution_group = get_attr_value(start, "substitutionGroup")
+        let substitution_group = get_attr_value(start, "substitutionGroup")?
             .map(|s| resolve_qname(&s, target_ns, prefixes));
-        let nillable = get_attr_value(start, "nillable")
+        let nillable = get_attr_value(start, "nillable")?
             .map(|v| v == "true" || v == "1")
             .unwrap_or(false);
 
-        let mut type_ref = get_attr_value(start, "type")
+        let mut type_ref = get_attr_value(start, "type")?
             .map(|t| resolve_type_ref(&t, target_ns, prefixes))
             .unwrap_or(TypeRef::Primitive(PrimitiveType::AnyType));
 
@@ -1879,9 +1892,9 @@ fn parse_union_members(
     union: &BytesStart,
     target_ns: Option<&str>,
     prefixes: &HashMap<String, String>,
-) -> Vec<UnionBranch> {
+) -> Result<Vec<UnionBranch>, SchemaError> {
     let mut names = HashMap::<String, usize>::new();
-    get_attr_value(union, "memberTypes")
+    Ok(get_attr_value(union, "memberTypes")?
         .unwrap_or_default()
         .split_whitespace()
         .map(|member| {
@@ -1905,7 +1918,7 @@ fn parse_union_members(
                 documentation: None,
             }
         })
-        .collect()
+        .collect())
 }
 
 /// Replace element-reference placeholders with their global element's declared type.
@@ -2053,14 +2066,18 @@ fn strip_prefix(s: &str) -> &str {
     s.split_once(':').map(|(_, local)| local).unwrap_or(s)
 }
 
-fn get_attr_value(e: &BytesStart, name: &str) -> Option<String> {
-    for attr in e.attributes().flatten() {
+fn get_attr_value(e: &BytesStart, name: &str) -> Result<Option<String>, SchemaError> {
+    for attr in e.attributes() {
+        let attr = attr.map_err(|error| SchemaError::Malformed(error.to_string()))?;
         let key = attr.key.as_ref();
         if key == name || strip_prefix(key) == name {
-            return Some(attr.value.as_ref().to_string());
+            return Ok(Some(
+                attr.normalized_value(quick_xml::XmlVersion::Implicit1_0)?
+                    .into_owned(),
+            ));
         }
     }
-    None
+    Ok(None)
 }
 
 fn resolve_qname(name: &str, target_ns: Option<&str>, prefixes: &HashMap<String, String>) -> QName {
@@ -2098,9 +2115,9 @@ fn parse_element_field(
     prefixes: &HashMap<String, String>,
     in_choice: bool,
     in_unbounded_compositor: bool,
-) -> Option<FieldDef> {
-    let ref_attr = get_attr_value(e, "ref");
-    let name_attr = get_attr_value(e, "name");
+) -> Result<Option<FieldDef>, SchemaError> {
+    let ref_attr = get_attr_value(e, "ref")?;
+    let name_attr = get_attr_value(e, "name")?;
 
     let (name, xml_name, namespace) = if let Some(ref r) = ref_attr {
         let qname = resolve_qname(r, target_ns, prefixes);
@@ -2109,13 +2126,15 @@ fn parse_element_field(
         let namespace = qname.namespace;
         (field_name, xml_name, namespace)
     } else {
-        let n = name_attr?;
+        let Some(n) = name_attr else {
+            return Ok(None);
+        };
         let xml_name = n.clone();
         let namespace = target_ns.map(Into::into);
         (n, xml_name, namespace)
     };
 
-    let type_ref = get_attr_value(e, "type")
+    let type_ref = get_attr_value(e, "type")?
         .map(|t| resolve_type_ref(&t, target_ns, prefixes))
         .or_else(|| {
             ref_attr
@@ -2127,7 +2146,7 @@ fn parse_element_field(
     let min_occurs = if in_choice {
         0
     } else {
-        get_attr_value(e, "minOccurs")
+        get_attr_value(e, "minOccurs")?
             .and_then(|v| v.parse().ok())
             .unwrap_or(1)
     };
@@ -2135,21 +2154,21 @@ fn parse_element_field(
     let max_occurs = if in_unbounded_compositor {
         OccursLimit::Unbounded
     } else {
-        match get_attr_value(e, "maxOccurs").as_deref() {
+        match get_attr_value(e, "maxOccurs")?.as_deref() {
             Some("unbounded") => OccursLimit::Unbounded,
             Some(v) => OccursLimit::Count(v.parse().unwrap_or(1)),
             None => OccursLimit::Count(1),
         }
     };
 
-    let nillable = get_attr_value(e, "nillable")
+    let nillable = get_attr_value(e, "nillable")?
         .map(|v| v == "true" || v == "1")
         .unwrap_or(false);
 
-    let default_value = get_attr_value(e, "default");
-    let fixed_value = get_attr_value(e, "fixed");
+    let default_value = get_attr_value(e, "default")?;
+    let fixed_value = get_attr_value(e, "fixed")?;
 
-    Some(FieldDef {
+    Ok(Some(FieldDef {
         name: sanitize_field_name(&name),
         xml_name,
         namespace,
@@ -2165,16 +2184,16 @@ fn parse_element_field(
         documentation: None,
         facets: None,
         is_cycle_cut: false,
-    })
+    }))
 }
 
 fn parse_attribute_field(
     e: &BytesStart,
     target_ns: Option<&str>,
     prefixes: &HashMap<String, String>,
-) -> Option<FieldDef> {
-    let ref_attr = get_attr_value(e, "ref");
-    let name_attr = get_attr_value(e, "name");
+) -> Result<Option<FieldDef>, SchemaError> {
+    let ref_attr = get_attr_value(e, "ref")?;
+    let name_attr = get_attr_value(e, "name")?;
 
     let (name, xml_name, namespace) = if let Some(ref r) = ref_attr {
         let qname = resolve_qname(r, target_ns, prefixes);
@@ -2183,12 +2202,14 @@ fn parse_attribute_field(
         let namespace = qname.namespace;
         (field_name, xml_name, namespace)
     } else {
-        let n = name_attr?;
+        let Some(n) = name_attr else {
+            return Ok(None);
+        };
         let xml_name = n.clone();
         (n, xml_name, None)
     };
 
-    let type_ref = get_attr_value(e, "type")
+    let type_ref = get_attr_value(e, "type")?
         .map(|t| resolve_type_ref(&t, target_ns, prefixes))
         .or_else(|| {
             ref_attr
@@ -2197,7 +2218,7 @@ fn parse_attribute_field(
         })
         .unwrap_or(TypeRef::Primitive(PrimitiveType::String));
 
-    let is_required = get_attr_value(e, "use")
+    let is_required = get_attr_value(e, "use")?
         .map(|u| u == "required")
         .unwrap_or(false);
 
@@ -2207,10 +2228,10 @@ fn parse_attribute_field(
         Cardinality::optional_one()
     };
 
-    let default_value = get_attr_value(e, "default");
-    let fixed_value = get_attr_value(e, "fixed");
+    let default_value = get_attr_value(e, "default")?;
+    let fixed_value = get_attr_value(e, "fixed")?;
 
-    Some(FieldDef {
+    Ok(Some(FieldDef {
         name: sanitize_field_name(&name),
         xml_name,
         namespace,
@@ -2223,28 +2244,32 @@ fn parse_attribute_field(
         documentation: None,
         facets: None,
         is_cycle_cut: false,
-    })
+    }))
 }
 
-fn parse_any_field(e: &BytesStart, in_choice: bool, in_unbounded_compositor: bool) -> FieldDef {
+fn parse_any_field(
+    e: &BytesStart,
+    in_choice: bool,
+    in_unbounded_compositor: bool,
+) -> Result<FieldDef, SchemaError> {
     let min_occurs = if in_choice {
         0
     } else {
-        get_attr_value(e, "minOccurs")
+        get_attr_value(e, "minOccurs")?
             .and_then(|v| v.parse::<usize>().ok())
             .unwrap_or(1)
     };
     let max_occurs = if in_unbounded_compositor {
         OccursLimit::Unbounded
     } else {
-        match get_attr_value(e, "maxOccurs").as_deref() {
+        match get_attr_value(e, "maxOccurs")?.as_deref() {
             Some("unbounded") => OccursLimit::Unbounded,
             Some(v) => OccursLimit::Count(v.parse::<usize>().unwrap_or(1)),
             None => OccursLimit::Count(1),
         }
     };
-    let namespace = get_attr_value(e, "namespace");
-    FieldDef {
+    let namespace = get_attr_value(e, "namespace")?;
+    Ok(FieldDef {
         name: "any".to_string(),
         xml_name: "*".to_string(),
         namespace,
@@ -2260,7 +2285,7 @@ fn parse_any_field(e: &BytesStart, in_choice: bool, in_unbounded_compositor: boo
         documentation: None,
         facets: None,
         is_cycle_cut: false,
-    }
+    })
 }
 
 fn parse_any_attribute_field(_e: &BytesStart) -> FieldDef {
@@ -2284,26 +2309,28 @@ fn parse_empty_global_element(
     e: &BytesStart,
     target_ns: Option<&str>,
     prefixes: &HashMap<String, String>,
-) -> Option<ElementDef> {
-    let name = get_attr_value(e, "name")?;
+) -> Result<Option<ElementDef>, SchemaError> {
+    let Some(name) = get_attr_value(e, "name")? else {
+        return Ok(None);
+    };
     let qname = QName::new(target_ns, name);
     let substitution_group =
-        get_attr_value(e, "substitutionGroup").map(|s| resolve_qname(&s, target_ns, prefixes));
-    let nillable = get_attr_value(e, "nillable")
+        get_attr_value(e, "substitutionGroup")?.map(|s| resolve_qname(&s, target_ns, prefixes));
+    let nillable = get_attr_value(e, "nillable")?
         .map(|v| v == "true" || v == "1")
         .unwrap_or(false);
 
-    let type_ref = get_attr_value(e, "type")
+    let type_ref = get_attr_value(e, "type")?
         .map(|t| resolve_type_ref(&t, target_ns, prefixes))
         .unwrap_or(TypeRef::Primitive(PrimitiveType::AnyType));
 
-    Some(ElementDef {
+    Ok(Some(ElementDef {
         qname,
         type_ref,
         substitution_group,
         nillable,
         documentation: None,
-    })
+    }))
 }
 
 fn sanitize_field_name(name: &str) -> String {
@@ -2668,34 +2695,34 @@ fn capture_content_model(
                         } else {
                             Particle::Sequence(items)
                         };
-                        result.push(repeat(model, &e));
+                        result.push(repeat(model, &e)?);
                     } else if local == "element" {
                         if let Some(field) =
-                            parse_element_field(&e, target_ns, prefixes, false, false)
+                            parse_element_field(&e, target_ns, prefixes, false, false)?
                         {
                             result.push(repeat(
-                                if get_attr_value(&e, "ref").is_some() {
+                                if get_attr_value(&e, "ref")?.is_some() {
                                     Particle::Reference(QName::new(field.namespace, field.xml_name))
                                 } else {
                                     Particle::Element(QName::new(field.namespace, field.xml_name))
                                 },
                                 &e,
-                            ));
+                            )?);
                         }
                         reader.read_to_end(e.name())?;
                     }
                 }
                 Event::Empty(e) if strip_prefix(e.name().into_inner()) == "element" => {
-                    if let Some(field) = parse_element_field(&e, target_ns, prefixes, false, false)
+                    if let Some(field) = parse_element_field(&e, target_ns, prefixes, false, false)?
                     {
                         result.push(repeat(
-                            if get_attr_value(&e, "ref").is_some() {
+                            if get_attr_value(&e, "ref")?.is_some() {
                                 Particle::Reference(QName::new(field.namespace, field.xml_name))
                             } else {
                                 Particle::Element(QName::new(field.namespace, field.xml_name))
                             },
                             &e,
-                        ));
+                        )?);
                     }
                 }
                 Event::End(e) if strip_prefix(e.name().into_inner()) == end => {
@@ -2706,16 +2733,16 @@ fn capture_content_model(
             }
         }
     }
-    fn repeat(model: Particle, e: &BytesStart) -> Particle {
-        let min = get_attr_value(e, "minOccurs")
+    fn repeat(model: Particle, e: &BytesStart) -> Result<Particle, SchemaError> {
+        let min = get_attr_value(e, "minOccurs")?
             .and_then(|s| s.parse().ok())
             .unwrap_or(1);
-        let max = match get_attr_value(e, "maxOccurs").as_deref() {
+        let max = match get_attr_value(e, "maxOccurs")?.as_deref() {
             Some("unbounded") => None,
             Some(value) => value.parse().ok(),
             None => Some(1),
         };
-        if min == 1 && max == Some(1) {
+        Ok(if min == 1 && max == Some(1) {
             model
         } else {
             Particle::Repeat {
@@ -2723,7 +2750,7 @@ fn capture_content_model(
                 min,
                 max,
             }
-        }
+        })
     }
     let mut preview = Reader::from_reader(*reader.get_ref());
     preview.config_mut().allow_unmatched_ends = true;
@@ -2803,16 +2830,18 @@ fn validate_schema_grammar(xml: &str) -> Result<(), SchemaError> {
         let mut prefixes = stack.last().map(|(_, p)| p.clone()).unwrap_or_else(|| {
             HashMap::from([("xml".into(), "http://www.w3.org/XML/1998/namespace".into())])
         });
-        for attr in element.attributes().flatten() {
+        for attr in element.attributes() {
+            let attr = attr.map_err(|error| SchemaError::Malformed(error.to_string()))?;
+            let value = attr.normalized_value(quick_xml::XmlVersion::Implicit1_0)?;
             if let Some(prefix) = attr.key.as_ref().strip_prefix("xmlns:") {
-                prefixes.insert(prefix.into(), attr.value.to_string());
+                prefixes.insert(prefix.into(), value.to_string());
             } else if attr.key.as_ref() == "xmlns" {
-                prefixes.insert(String::new(), attr.value.to_string());
+                prefixes.insert(String::new(), value.to_string());
             }
         }
         let local = strip_prefix(element.name().into_inner());
         if stack.is_empty() && local == "schema" {
-            schema_namespace = get_attr_value(&element, "targetNamespace");
+            schema_namespace = get_attr_value(&element, "targetNamespace")?;
         }
         let position = reader.buffer_position() as usize;
         line += xml[line_position..position]
@@ -2849,14 +2878,16 @@ fn validate_schema_grammar(xml: &str) -> Result<(), SchemaError> {
                 "Illegal child {local} under simpleType at line {line}"
             )));
         }
-        for attr in element.attributes().flatten() {
+        for attr in element.attributes() {
+            let attr = attr.map_err(|error| SchemaError::Malformed(error.to_string()))?;
+            let value = attr.normalized_value(quick_xml::XmlVersion::Implicit1_0)?;
             if !annotation
                 && matches!(
                     attr.key.as_ref(),
                     "type" | "base" | "itemType" | "memberTypes" | "ref"
                 )
             {
-                for value in attr.value.split_whitespace() {
+                for value in value.split_whitespace() {
                     if let Some((prefix, local)) = value.split_once(':') {
                         let Some(namespace) = prefixes.get(prefix) else {
                             return Err(SchemaError::Resolution(format!(
diff --git a/crates/polyxml-core/src/serializer.rs b/crates/polyxml-core/src/serializer.rs
index f68ba99..f6de2f4 100644
--- a/crates/polyxml-core/src/serializer.rs
+++ b/crates/polyxml-core/src/serializer.rs
@@ -523,93 +523,7 @@ impl XmlSerializer {
             if let Some(PolyValue::List(items)) =
                 get_field(mixed.items_index, &schema.fields[mixed.items_index].name)
             {
-                for item in items {
-                    let tagged_field = |name: &str| -> Option<&PolyValue> {
-                        match item {
-                            PolyValue::Object(tagged) => tagged.get(name),
-                            PolyValue::Record { schema, values } => schema
-                                .fields
-                                .iter()
-                                .position(|field| field.name == name)
-                                .and_then(|idx| values.get(idx))
-                                .and_then(Option::as_ref),
-                            _ => None,
-                        }
-                    };
-                    let Some(kind) = tagged_field("kind").and_then(PolyValue::as_str) else {
-                        return Err(PolyXmlError::SerializationError(
-                            "Mixed content item has no kind".into(),
-                        ));
-                    };
-                    let Some(content) = tagged_field("value") else {
-                        return Err(PolyXmlError::SerializationError(
-                            "Mixed content item has no value".into(),
-                        ));
-                    };
-                    if kind == "#text" {
-                        let Some(text) = content.as_str() else {
-                            return Err(PolyXmlError::SerializationError(
-                                "Mixed text item must be a string".into(),
-                            ));
-                        };
-                        writer
-                            .write_event(Event::Text(BytesText::new(text)))
-                            .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
-                        continue;
-                    }
-                    let Some(branch) = mixed
-                        .branches
-                        .iter()
-                        .find(|branch| branch.variant_name == kind)
-                    else {
-                        return Err(PolyXmlError::SerializationError(format!(
-                            "Unknown mixed content kind: {kind}"
-                        )));
-                    };
-                    let local_name = std::str::from_utf8(&branch.xml_name)?;
-                    let qualified = if let Some(ctx) = ns_ctx {
-                        ctx.qualify_element(
-                            local_name,
-                            branch.namespace.as_deref().or(schema.namespace.as_deref()),
-                        )
-                    } else {
-                        Cow::Borrowed(local_name)
-                    };
-                    match &branch.val_type {
-                        ValueType::Scalar(_) => {
-                            let mut buf = [0u8; lexical_core::BUFFER_SIZE];
-                            let Some(text) = Self::format_scalar_to(content, &mut buf) else {
-                                return Err(PolyXmlError::SerializationError(format!(
-                                    "Invalid mixed content value for {kind}"
-                                )));
-                            };
-                            Self::validate_scalar(&branch.val_type, &text, kind)?;
-                            writer
-                                .write_event(Event::Start(BytesStart::new(qualified.as_ref())))
-                                .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
-                            writer
-                                .write_event(Event::Text(BytesText::new(&text)))
-                                .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
-                            writer
-                                .write_event(Event::End(BytesEnd::new(qualified.as_ref())))
-                                .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
-                        }
-                        ValueType::Nested(nested) => Self::write_model(
-                            writer,
-                            &branch.xml_name,
-                            content,
-                            nested,
-                            ns_ctx,
-                            false,
-                            branch.namespace.as_deref().or(nested.namespace.as_deref()),
-                        )?,
-                        ValueType::List(_) => {
-                            return Err(PolyXmlError::SerializationError(
-                                "Nested lists are invalid mixed content branches".into(),
-                            ))
-                        }
-                    }
-                }
+                Self::write_mixed_items(writer, items, schema, mixed, ns_ctx)?;
             }
         } else {
             for (idx, field) in schema.fields.iter().enumerate() {
@@ -759,6 +673,198 @@ impl XmlSerializer {
         Ok(())
     }
 
+    fn write_mixed_items<W: std::io::Write>(
+        writer: &mut Writer<W>,
+        items: &[PolyValue],
+        schema: &ModelSchema,
+        mixed: &crate::schema::MixedContentSchema,
+        ns_ctx: Option<&NamespaceContext>,
+    ) -> Result<()> {
+        // Amortize the temporary index only for sufficiently large schemas and
+        // repeated payloads. References avoid cloning keys or branch metadata.
+        if mixed.branches.len() >= 64
+            && items.len() >= 64
+            && items.len() >= mixed.branches.len().div_ceil(2)
+            && Self::mixed_lookup_sample_favors_index(items, mixed)
+        {
+            let mut index = std::collections::HashMap::with_capacity(mixed.branches.len());
+            for branch in &mixed.branches {
+                // Preserve the linear lookup's first-match behavior for public
+                // metadata containing duplicate variant names.
+                index.entry(branch.variant_name.as_str()).or_insert(branch);
+            }
+            Self::write_mixed_items_using(writer, items, schema, ns_ctx, |kind| {
+                index.get(kind).copied()
+            })
+        } else {
+            Self::write_mixed_items_using(writer, items, schema, ns_ctx, |kind| {
+                mixed
+                    .branches
+                    .iter()
+                    .find(|branch| branch.variant_name == kind)
+            })
+        }
+    }
+
+    fn mixed_lookup_sample_favors_index(
+        items: &[PolyValue],
+        mixed: &crate::schema::MixedContentSchema,
+    ) -> bool {
+        // Spread a bounded sample across the payload. Early-branch reuse and
+        // text-only items otherwise pay for an index that saves little work.
+        let stride = items.len() / 16;
+        let mut tagged = 0;
+        let mut comparisons = 0;
+        for sample in 0..16 {
+            // Offset within each bin to avoid sampling the same tag when a
+            // repeated choice cycle divides the stride exactly.
+            let offset = (sample * 17 + 7) % stride;
+            let Some(kind) = items[sample * stride + offset]
+                .get("kind")
+                .and_then(PolyValue::as_str)
+            else {
+                continue;
+            };
+            if kind == "#text" {
+                continue;
+            }
+            if let Some(position) = mixed
+                .branches
+                .iter()
+                .position(|branch| branch.variant_name == kind)
+            {
+                tagged += 1;
+                comparisons += position + 1;
+            }
+        }
+        tagged >= 4 && comparisons >= tagged * 16
+    }
+
+    #[inline(never)]
+    fn write_mixed_items_using<'a, W: std::io::Write, F>(
+        writer: &mut Writer<W>,
+        items: &[PolyValue],
+        schema: &ModelSchema,
+        ns_ctx: Option<&NamespaceContext>,
+        lookup: F,
+    ) -> Result<()>
+    where
+        F: Fn(&str) -> Option<&'a crate::schema::MixedBranchSchema>,
+    {
+        for item in items {
+            let tagged_field = |name: &str| -> Option<&PolyValue> {
+                match item {
+                    PolyValue::Object(tagged) => tagged.get(name),
+                    PolyValue::Record { schema, values } => schema
+                        .fields
+                        .iter()
+                        .position(|field| field.name == name)
+                        .and_then(|idx| values.get(idx))
+                        .and_then(Option::as_ref),
+                    _ => None,
+                }
+            };
+            let Some(kind) = tagged_field("kind").and_then(PolyValue::as_str) else {
+                return Err(PolyXmlError::SerializationError(
+                    "Mixed content item has no kind".into(),
+                ));
+            };
+            let Some(content) = tagged_field("value") else {
+                return Err(PolyXmlError::SerializationError(
+                    "Mixed content item has no value".into(),
+                ));
+            };
+            if kind == "#text" {
+                let Some(text) = content.as_str() else {
+                    return Err(PolyXmlError::SerializationError(
+                        "Mixed text item must be a string".into(),
+                    ));
+                };
+                writer
+                    .write_event(Event::Text(BytesText::new(text)))
+                    .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
+                continue;
+            }
+            let Some(branch) = lookup(kind) else {
+                return Err(PolyXmlError::SerializationError(format!(
+                    "Unknown mixed content kind: {kind}"
+                )));
+            };
+            let local_name = std::str::from_utf8(&branch.xml_name)?;
+            let qualified = if let Some(ctx) = ns_ctx {
+                ctx.qualify_element(
+                    local_name,
+                    branch.namespace.as_deref().or(schema.namespace.as_deref()),
+                )
+            } else {
+                Cow::Borrowed(local_name)
+            };
+            match &branch.val_type {
+                ValueType::Scalar(_) => {
+                    let mut buf = [0u8; lexical_core::BUFFER_SIZE];
+                    let Some(text) = Self::format_scalar_to(content, &mut buf) else {
+                        if content.is_null() {
+                            Self::write_mixed_nil(writer, qualified.as_ref())?;
+                            continue;
+                        }
+                        return Err(PolyXmlError::SerializationError(format!(
+                            "Invalid mixed content value for {kind}"
+                        )));
+                    };
+                    Self::validate_scalar(&branch.val_type, &text, kind)?;
+                    writer
+                        .write_event(Event::Start(BytesStart::new(qualified.as_ref())))
+                        .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
+                    writer
+                        .write_event(Event::Text(BytesText::new(&text)))
+                        .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
+                    writer
+                        .write_event(Event::End(BytesEnd::new(qualified.as_ref())))
+                        .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
+                }
+                ValueType::Nested(nested) => {
+                    if content.is_null() {
+                        Self::write_mixed_nil(writer, qualified.as_ref())?;
+                    } else {
+                        Self::write_model(
+                            writer,
+                            &branch.xml_name,
+                            content,
+                            nested,
+                            ns_ctx,
+                            false,
+                            branch.namespace.as_deref().or(nested.namespace.as_deref()),
+                        )?;
+                    }
+                }
+                ValueType::List(_) => {
+                    return Err(PolyXmlError::SerializationError(
+                        "Nested lists are invalid mixed content branches".into(),
+                    ))
+                }
+            }
+        }
+        Ok(())
+    }
+
+    // A tagged null is a present nil element, unlike an absent ordinary field.
+    // Bind the instance prefix locally without shadowing the element's QName.
+    // Scalar callers reach this through their existing failed-format path.
+    #[cold]
+    fn write_mixed_nil<W: std::io::Write>(writer: &mut Writer<W>, qualified: &str) -> Result<()> {
+        let (declaration, attribute) = if qualified.starts_with("xsi:") {
+            ("xmlns:xsi1", "xsi1:nil")
+        } else {
+            ("xmlns:xsi", "xsi:nil")
+        };
+        let mut element = BytesStart::new(qualified);
+        element.push_attribute((declaration, XSI_NS));
+        element.push_attribute((attribute, "true"));
+        writer
+            .write_event(Event::Empty(element))
+            .map_err(|error| PolyXmlError::SerializationError(error.to_string()))
+    }
+
     fn write_any_wildcard_element<W: std::io::Write>(
         writer: &mut quick_xml::Writer<W>,
         val: &PolyValue,
diff --git a/crates/polyxml-core/tests/test_default_literal_codegen.rs b/crates/polyxml-core/tests/test_default_literal_codegen.rs
new file mode 100644
index 0000000..fabef09
--- /dev/null
+++ b/crates/polyxml-core/tests/test_default_literal_codegen.rs
@@ -0,0 +1,150 @@
+//! Execute consumers: escaping must preserve values as well as valid source.
+use polyxml::codegen::*;
+use polyxml::schema_parser::XsdParser;
+use std::{fs, path::Path, process::Command};
+
+fn run(directory: &Path, program: &str, args: &[&str]) {
+    let output = Command::new(program)
+        .args(args)
+        .current_dir(directory)
+        .output()
+        .unwrap();
+    assert!(
+        output.status.success(),
+        "{program} {args:?}:\n{}\n{}",
+        String::from_utf8_lossy(&output.stdout),
+        String::from_utf8_lossy(&output.stderr)
+    );
+}
+
+#[test]
+fn generated_string_defaults_and_fixed_values_preserve_xml_characters() {
+    let ir = XsdParser::new()
+        .parse_str(include_str!(
+            "../../../research/fixtures/default_literal_escaping.xsd"
+        ))
+        .unwrap();
+    let expected = "\"quoted\"\\path\\u000a\t\n\r\u{85}\u{2028}café 😀";
+    let root = tempfile::tempdir().unwrap();
+    let consumer = |name: &str| {
+        let path = root.path().join(name);
+        fs::create_dir(&path).unwrap();
+        fs::write(path.join("expected.txt"), expected).unwrap();
+        path
+    };
+    let python = consumer("python");
+    fs::write(
+        python.join("models.py"),
+        PythonCodegen::new(PythonOptions::default()).generate_module(&ir),
+    )
+    .unwrap();
+    fs::write(
+        python.join("check.py"),
+        r#"import dataclasses
+from models import RootType
+with open('expected.txt', encoding='utf-8', newline='') as f:
+    expected = f.read()
+model = RootType(fixed=expected)
+assert model.value == expected, repr(model.value)
+assert model.label == expected, repr(model.label)
+fields = {f.name: f for f in dataclasses.fields(RootType)}
+assert fields['value'].metadata['default'] == expected
+assert fields['label'].metadata['default'] == expected
+assert fields['fixed'].metadata['fixed'] == expected
+"#,
+    )
+    .unwrap();
+    run(&python, "python3", &["check.py"]);
+    let pydantic = consumer("pydantic");
+    fs::write(
+        pydantic.join("models.py"),
+        PythonCodegen::new(PythonOptions {
+            backend: PythonBackend::Pydantic,
+            ..Default::default()
+        })
+        .generate_module(&ir),
+    )
+    .unwrap();
+    fs::write(
+        pydantic.join("check.py"),
+        r#"from models import RootType
+with open('expected.txt', encoding='utf-8', newline='') as f:
+    expected = f.read()
+model = RootType(fixed=expected)
+assert model.value == expected
+assert model.label == expected
+assert RootType.model_fields['value'].json_schema_extra['default'] == expected
+assert RootType.model_fields['fixed'].json_schema_extra['fixed'] == expected
+"#,
+    )
+    .unwrap();
+    run(&pydantic, "python3", &["check.py"]);
+    let cpp = consumer("cpp");
+    fs::write(
+        cpp.join("models.hpp"),
+        CppCodegen::new(CppOptions::default()).generate_header(&ir),
+    )
+    .unwrap();
+    fs::write(
+        cpp.join("main.cpp"),
+        r#"#include "models.hpp"
+#include <fstream>
+#include <iterator>
+#include <stdexcept>
+int main() {
+ std::ifstream input("expected.txt", std::ios::binary);
+ std::string expected((std::istreambuf_iterator<char>(input)), std::istreambuf_iterator<char>());
+ polyxml::generated::RootType model;
+ if(model.value != expected) throw std::runtime_error("default mismatch");
+}
+"#,
+    )
+    .unwrap();
+    run(
+        &cpp,
+        "g++",
+        &[
+            "-std=c++20",
+            "-Wall",
+            "-Wextra",
+            "-Werror",
+            "main.cpp",
+            "-o",
+            "check",
+        ],
+    );
+    run(&cpp, "./check", &[]);
+    let csharp = consumer("csharp");
+    fs::write(csharp.join("Check.csproj"), "<Project Sdk=\"Microsoft.NET.Sdk\"><PropertyGroup><OutputType>Exe</OutputType><TargetFramework>net8.0</TargetFramework><ImplicitUsings>enable</ImplicitUsings><Nullable>enable</Nullable><TreatWarningsAsErrors>true</TreatWarningsAsErrors></PropertyGroup></Project>").unwrap();
+    fs::write(
+        csharp.join("Models.cs"),
+        CSharpCodegen::new(CSharpOptions {
+            namespace: "Models".into(),
+            ..Default::default()
+        })
+        .generate_module(&ir),
+    )
+    .unwrap();
+    fs::write(
+        csharp.join("Program.cs"),
+        r#"using Models;
+using System.ComponentModel.DataAnnotations;
+var expected = File.ReadAllText("expected.txt");
+var model = new RootType();
+if(model.Label != expected || model.Fixed != expected) throw new Exception("initializer mismatch");
+model.ValueXml = "";
+if(model.Value != expected) throw new Exception("element default mismatch");
+model.Fixed = expected;
+try { model.Fixed = expected + "wrong"; throw new Exception("fixed value accepted"); }
+catch(ValidationException) {}
+model.LabelXml = expected;
+if(model.Label != expected) throw new Exception("attribute proxy mismatch");
+"#,
+    )
+    .unwrap();
+    run(
+        &csharp,
+        "dotnet",
+        &["run", "--project", "Check.csproj", "--verbosity", "quiet"],
+    );
+}
diff --git a/crates/polyxml-core/tests/test_enum_literal_codegen.rs b/crates/polyxml-core/tests/test_enum_literal_codegen.rs
new file mode 100644
index 0000000..384b65d
--- /dev/null
+++ b/crates/polyxml-core/tests/test_enum_literal_codegen.rs
@@ -0,0 +1,233 @@
+//! Compile generated enum consumers and compare runtime values with independent
+//! data files. Source substring checks cannot catch escaping that changes values.
+use std::{fs, path::Path, process::Command};
+
+use polyxml::codegen::*;
+use polyxml::ir::{QName, TypeDef};
+use polyxml::schema_parser::XsdParser;
+
+fn run(directory: &Path, program: &str, args: &[&str]) {
+    let output = Command::new(program)
+        .args(args)
+        .current_dir(directory)
+        .env("CARGO_BUILD_JOBS", "1")
+        .output()
+        .unwrap_or_else(|error| panic!("running {program}: {error}"));
+    assert!(
+        output.status.success(),
+        "{program} {args:?}:\n{}\n{}",
+        String::from_utf8_lossy(&output.stdout),
+        String::from_utf8_lossy(&output.stderr)
+    );
+}
+
+#[test]
+fn enum_literals_compile_and_preserve_values_in_all_seven_languages() {
+    let ir = XsdParser::new()
+        .parse_str(include_str!(
+            "../../../research/fixtures/enum_literal_escaping.xsd"
+        ))
+        .unwrap();
+    let TypeDef::Enum(status) = &ir.types[&QName::local("Status")] else {
+        panic!("expected Status enum");
+    };
+    let expected = [
+        "R&D",
+        "\"quoted\" 'value' <tag>",
+        "café 😀",
+        "literal &amp;",
+        "slash\\path\\u000a",
+        "tab\tline\ncarriage\rtail",
+        "\u{85}next\u{2028}line",
+    ];
+    assert_eq!(
+        status
+            .variants
+            .iter()
+            .map(|v| v.value.as_str())
+            .collect::<Vec<_>>(),
+        expected
+    );
+    let root = tempfile::tempdir().unwrap();
+    let json = serde_json::to_vec(&expected).unwrap();
+    let mut binary = Vec::new();
+    for value in expected {
+        binary.extend_from_slice(&(value.len() as u32).to_le_bytes());
+        binary.extend_from_slice(value.as_bytes());
+    }
+    let consumer = |name: &str| {
+        let path = root.path().join(name);
+        fs::create_dir(&path).unwrap();
+        fs::write(path.join("expected.json"), &json).unwrap();
+        fs::write(path.join("expected.bin"), &binary).unwrap();
+        path
+    };
+
+    let rust = consumer("rust");
+    fs::create_dir(rust.join("src")).unwrap();
+    let core = Path::new(env!("CARGO_MANIFEST_DIR"));
+    fs::write(rust.join("Cargo.toml"), format!("[package]\nname=\"enum-literal-test\"\nversion=\"0.0.0\"\nedition=\"2021\"\n[dependencies]\npolyxml={{path={core:?}}}\nquick-xml=\"0.42\"\nserde={{version=\"1\",features=[\"derive\"]}}\nserde_json=\"1\"\n")).unwrap();
+    fs::write(
+        rust.join("src/models.rs"),
+        RustCodegen::new(RustOptions::default()).generate_module(&ir),
+    )
+    .unwrap();
+    fs::write(rust.join("src/main.rs"), r#"mod models;
+fn main() {
+ let expected: Vec<String> = serde_json::from_slice(&std::fs::read("expected.json").unwrap()).unwrap();
+ for text in expected {
+   let value: models::Status = text.parse().unwrap();
+   assert_eq!(value.as_str(), text);
+   let json = serde_json::to_string(&value).unwrap();
+   assert_eq!(serde_json::from_str::<String>(&json).unwrap(), text);
+   assert_eq!(serde_json::from_str::<models::Status>(&json).unwrap(), value);
+ }
+}"#).unwrap();
+    let output = Command::new("cargo")
+        .args(["run", "--offline", "--quiet"])
+        .env(
+            "CARGO_TARGET_DIR",
+            core.join("../../target/enum-literal-tests"),
+        )
+        .env("CARGO_BUILD_JOBS", "1")
+        .current_dir(&rust)
+        .output()
+        .unwrap();
+    assert!(
+        output.status.success(),
+        "Rust: {}",
+        String::from_utf8_lossy(&output.stderr)
+    );
+
+    let python = consumer("python");
+    fs::write(
+        python.join("models.py"),
+        PythonCodegen::new(PythonOptions::default()).generate_module(&ir),
+    )
+    .unwrap();
+    fs::write(python.join("check.py"), "import json\nfrom models import Status\nwith open('expected.json', encoding='utf-8') as f:\n    expected = json.load(f)\nassert [v.value for v in Status] == expected\nfor value in expected:\n    assert Status(value).value == value\n").unwrap();
+    run(&python, "python3", &["check.py"]);
+
+    let go = consumer("go");
+    fs::write(go.join("go.mod"), "module literals\n\ngo 1.22\n").unwrap();
+    fs::write(
+        go.join("models.go"),
+        GoCodegen::new(GoOptions::default()).generate_module(&ir),
+    )
+    .unwrap();
+    fs::write(go.join("models_test.go"), r#"package models
+import("encoding/json";"os";"testing")
+func TestValues(t *testing.T) {
+ data,err:=os.ReadFile("expected.json");if err!=nil{t.Fatal(err)};var expected []string
+ if err=json.Unmarshal(data,&expected);err!=nil{t.Fatal(err)}
+ for _,text:=range expected{value:=Status(text);if !value.IsValid(){t.Fatal(text)};encoded,err:=json.Marshal(value);if err!=nil{t.Fatal(err)};var actual string;if err=json.Unmarshal(encoded,&actual);err!=nil{t.Fatal(err)};if actual!=text{t.Fatal(actual,text)}}
+}"#).unwrap();
+    run(&go, "go", &["test", "./..."]);
+
+    let cpp = consumer("cpp");
+    fs::write(
+        cpp.join("models.hpp"),
+        CppCodegen::new(CppOptions::default()).generate_header(&ir),
+    )
+    .unwrap();
+    fs::write(
+        cpp.join("main.cpp"),
+        r#"#include "models.hpp"
+#include <fstream>
+#include <stdexcept>
+int main(){std::ifstream input("expected.bin",std::ios::binary);unsigned char size[4];
+ while(input.read(reinterpret_cast<char*>(size),4)){
+ unsigned count=size[0]|(unsigned(size[1])<<8)|(unsigned(size[2])<<16)|(unsigned(size[3])<<24);
+ std::string expected(count,'\0');input.read(expected.data(),count);
+ auto value=polyxml::generated::status_from_string(expected);
+ if(!value||polyxml::generated::to_string(*value)!=expected)throw std::runtime_error(expected);
+ }}"#,
+    )
+    .unwrap();
+    run(
+        &cpp,
+        "c++",
+        &[
+            "-std=c++20",
+            "-Wall",
+            "-Wextra",
+            "-Werror",
+            "main.cpp",
+            "-o",
+            "check",
+        ],
+    );
+    run(&cpp, "./check", &[]);
+
+    let java = consumer("java");
+    fs::write(
+        java.join("Models.java"),
+        JavaCodegen::new(JavaOptions {
+            package_name: String::new(),
+            ..Default::default()
+        })
+        .generate_module(&ir, "Models"),
+    )
+    .unwrap();
+    fs::write(java.join("Check.java"), r#"import java.nio.*;import java.nio.file.*;import java.nio.charset.*;
+public class Check {public static void main(String[] args)throws Exception{
+ ByteBuffer input=ByteBuffer.wrap(Files.readAllBytes(Path.of("expected.bin"))).order(ByteOrder.LITTLE_ENDIAN);
+ while(input.hasRemaining()){byte[] bytes=new byte[input.getInt()];input.get(bytes);String text=new String(bytes,StandardCharsets.UTF_8);
+ if(!Models.Status.fromValue(text).getValue().equals(text))throw new AssertionError(text);
+ }}}
+"#).unwrap();
+    run(&java, "javac", &["Models.java", "Check.java"]);
+    run(&java, "java", &["Check"]);
+
+    let csharp = consumer("csharp");
+    fs::write(csharp.join("Check.csproj"), "<Project Sdk=\"Microsoft.NET.Sdk\"><PropertyGroup><OutputType>Exe</OutputType><TargetFramework>net8.0</TargetFramework><ImplicitUsings>enable</ImplicitUsings><Nullable>enable</Nullable></PropertyGroup></Project>").unwrap();
+    fs::write(
+        csharp.join("Models.cs"),
+        CSharpCodegen::new(CSharpOptions {
+            namespace: "Models".into(),
+            ..Default::default()
+        })
+        .generate_module(&ir),
+    )
+    .unwrap();
+    fs::write(
+        csharp.join("Program.cs"),
+        r#"using Models;using System.Text;using System.Xml.Serialization;using System.Reflection;
+using var reader=new BinaryReader(File.OpenRead("expected.bin"));
+foreach(var value in Enum.GetValues<Status>()){
+ string expected=Encoding.UTF8.GetString(reader.ReadBytes(reader.ReadInt32()));
+ if(value.ToXmlValue()!=expected)throw new Exception(expected);
+ var attribute=typeof(Status).GetField(value.ToString())!.GetCustomAttribute<XmlEnumAttribute>()!;
+ if(attribute.Name!=expected)throw new Exception(attribute.Name);
+}
+if(reader.BaseStream.Position!=reader.BaseStream.Length)throw new Exception("missing variants");
+"#,
+    )
+    .unwrap();
+    run(
+        &csharp,
+        "dotnet",
+        &["run", "--project", "Check.csproj", "--verbosity", "quiet"],
+    );
+
+    let typescript = consumer("typescript");
+    fs::write(
+        typescript.join("models.ts"),
+        TypeScriptCodegen::new(TypeScriptOptions::default()).generate_module(&ir),
+    )
+    .unwrap();
+    fs::write(typescript.join("check.cjs"), "const fs=require('fs');const {Status}=require('./models.js');const assert=require('assert');assert.deepStrictEqual(Object.values(Status),JSON.parse(fs.readFileSync('expected.json','utf8')));\n").unwrap();
+    run(
+        &typescript,
+        "tsc",
+        &[
+            "--target",
+            "es2020",
+            "--module",
+            "commonjs",
+            "--strict",
+            "models.ts",
+        ],
+    );
+    run(&typescript, "node", &["check.cjs"]);
+}
diff --git a/crates/polyxml-core/tests/test_mixed_branch_lookup.rs b/crates/polyxml-core/tests/test_mixed_branch_lookup.rs
new file mode 100644
index 0000000..52996dc
--- /dev/null
+++ b/crates/polyxml-core/tests/test_mixed_branch_lookup.rs
@@ -0,0 +1,122 @@
+use polyxml::schema::{FieldKind, FieldSchema, ModelSchema, ScalarType, ValueType};
+use polyxml::schema_parser::XsdParser;
+use polyxml::{deserialize, serialize, PolyValue};
+use std::{collections::HashMap, sync::Arc};
+
+fn tagged(kind: &str, value: PolyValue) -> PolyValue {
+    PolyValue::Object(HashMap::from([
+        ("kind".into(), PolyValue::String(kind.into())),
+        ("value".into(), value),
+    ]))
+}
+
+#[test]
+fn large_mixed_tables_keep_first_match_metadata_edits_records_and_nil() {
+    let declarations = (0..64)
+        .map(|i| format!(r#"<xs:element name="B{i}" type="xs:int"/>"#))
+        .collect::<String>();
+    let xsd = format!(
+        r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"><xs:element name="Root"><xs:complexType mixed="true"><xs:choice minOccurs="0" maxOccurs="unbounded">{declarations}</xs:choice></xs:complexType></xs:element></xs:schema>"#
+    );
+    let ir = XsdParser::new().parse_str(&xsd).unwrap();
+    let mut schema = ModelSchema::from_ir(&ir, Some("Root")).unwrap();
+    let mixed = schema.mixed_content.as_ref().unwrap();
+    let items_name = schema.fields[mixed.items_index].name.clone();
+    let kinds = (0..64)
+        .map(|i| {
+            mixed
+                .branches
+                .iter()
+                .find(|b| b.xml_name == format!("B{i}").as_bytes())
+                .unwrap()
+                .variant_name
+                .clone()
+        })
+        .collect::<Vec<_>>();
+    let first_index = mixed
+        .branches
+        .iter()
+        .position(|b| b.xml_name == b"B0")
+        .unwrap();
+    let old_kind = kinds[0].clone();
+    let record_schema = ModelSchema::builder("Tagged")
+        .field(FieldSchema::new(
+            "value",
+            b"value",
+            FieldKind::Element,
+            ValueType::Scalar(ScalarType::Int),
+        ))
+        .field(FieldSchema::new(
+            "kind",
+            b"kind",
+            FieldKind::Element,
+            ValueType::Scalar(ScalarType::String),
+        ))
+        .build();
+    let mut items = (0..256)
+        .map(|i| tagged(&kinds[i % 64], PolyValue::Int(i as i64)))
+        .collect::<Vec<_>>();
+    items[0] = PolyValue::Record {
+        schema: record_schema,
+        values: vec![
+            Some(PolyValue::Int(0)),
+            Some(PolyValue::String(old_kind.clone())),
+        ]
+        .into_boxed_slice(),
+    };
+    items.push(tagged(&kinds[63], PolyValue::Null));
+    let mut value = PolyValue::Object(HashMap::from([(
+        items_name.clone(),
+        PolyValue::List(items),
+    )]));
+    {
+        let mixed = Arc::get_mut(&mut schema)
+            .unwrap()
+            .mixed_content
+            .as_mut()
+            .unwrap();
+        let mut duplicate = mixed.branches[first_index].clone();
+        duplicate.xml_name = b"Duplicate".to_vec();
+        mixed.branches.push(duplicate);
+    }
+    let output = serialize("Root", &value, &schema, None).unwrap();
+    assert!(std::str::from_utf8(&output).unwrap().contains("<B0>0</B0>"));
+    assert!(!std::str::from_utf8(&output).unwrap().contains("<Duplicate"));
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    Arc::get_mut(&mut schema)
+        .unwrap()
+        .mixed_content
+        .as_mut()
+        .unwrap()
+        .branches[first_index]
+        .variant_name = "changed_kind".into();
+    let PolyValue::Object(root) = &mut value else {
+        unreachable!()
+    };
+    let PolyValue::List(items) = root.get_mut(&items_name).unwrap() else {
+        unreachable!()
+    };
+    for item in items.iter_mut() {
+        if item.get("kind").and_then(PolyValue::as_str) == Some(old_kind.as_str()) {
+            match item {
+                PolyValue::Object(fields) => {
+                    fields.insert("kind".into(), PolyValue::String("changed_kind".into()));
+                }
+                PolyValue::Record { values, .. } => {
+                    values[1] = Some(PolyValue::String("changed_kind".into()))
+                }
+                _ => unreachable!(),
+            }
+        }
+    }
+    let output = serialize("Root", &value, &schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    let PolyValue::Object(root) = &mut value else {
+        unreachable!()
+    };
+    let PolyValue::List(items) = root.get_mut(&items_name).unwrap() else {
+        unreachable!()
+    };
+    items[0] = tagged("unregistered", PolyValue::Int(0));
+    assert!(serialize("Root", &value, &schema, None).is_err());
+}
diff --git a/crates/polyxml-core/tests/test_mixed_nil.rs b/crates/polyxml-core/tests/test_mixed_nil.rs
new file mode 100644
index 0000000..95cc765
--- /dev/null
+++ b/crates/polyxml-core/tests/test_mixed_nil.rs
@@ -0,0 +1,93 @@
+use std::collections::HashMap;
+use std::sync::Arc;
+
+use polyxml::schema::ModelSchema;
+use polyxml::schema_parser::XsdParser;
+use polyxml::serializer::XmlSerializer;
+use polyxml::{deserialize, serialize, PolyValue};
+
+fn schema(namespace: Option<&str>) -> Arc<ModelSchema> {
+    let declaration = namespace
+        .map(|ns| format!("targetNamespace='{ns}' xmlns:t='{ns}' elementFormDefault='qualified'"))
+        .unwrap_or_default();
+    let xsd = format!("<xs:schema xmlns:xs='http://www.w3.org/2001/XMLSchema' {declaration}>
+      <xs:element name='Root'><xs:complexType mixed='true'><xs:choice minOccurs='0' maxOccurs='unbounded'>
+        <xs:element name='Text' type='xs:string' nillable='true'/>
+        <xs:element name='Number' type='xs:int' nillable='true'/>
+        <xs:element name='Child' nillable='true'><xs:complexType><xs:sequence>
+          <xs:element name='Value' type='xs:string'/>
+        </xs:sequence></xs:complexType></xs:element>
+      </xs:choice></xs:complexType></xs:element></xs:schema>");
+    let ir = XsdParser::new().parse_str(&xsd).unwrap();
+    ModelSchema::from_ir(&ir, Some("Root")).unwrap()
+}
+
+#[test]
+fn nil_scalar_and_nested_items_keep_order_and_differ_from_empty_strings() {
+    let schema = schema(None);
+    for nil in [
+        "<Text i:nil='true'/>",
+        "<Text i:nil='1'></Text>",
+        "<Number i:nil='true'/>",
+        "<Child i:nil='true'/>",
+    ] {
+        let xml = format!("<Root xmlns:i='http://www.w3.org/2001/XMLSchema-instance'>before{nil}<Text/><Child><Value>nested</Value></Child>{nil}<Text>after</Text></Root>");
+        let value = deserialize(xml.as_bytes(), Arc::clone(&schema)).unwrap();
+        let items_field = &schema.fields[schema.mixed_content.as_ref().unwrap().items_index].name;
+        let items = value.get(items_field).and_then(PolyValue::as_list).unwrap();
+        assert!(items[1].get("value").unwrap().is_null());
+        assert_eq!(items[2].get("value").and_then(PolyValue::as_str), Some(""));
+        assert!(items[4].get("value").unwrap().is_null());
+        let output = serialize("Root", &value, &schema, None).unwrap();
+        assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    }
+}
+
+#[test]
+fn nil_instance_prefix_does_not_rebind_the_element_namespace() {
+    let schema = schema(Some("urn:document"));
+    let xml = b"<Root xmlns='urn:document' xmlns:i='http://www.w3.org/2001/XMLSchema-instance'><Text i:nil='true'/><Number i:nil='true'/><Child i:nil='true'/><Text>after</Text></Root>";
+    let value = deserialize(xml, Arc::clone(&schema)).unwrap();
+    for prefix in ["", "doc", "xsi", "xsi1"] {
+        let ns_map = HashMap::from([(prefix.to_owned(), "urn:document".to_owned())]);
+        let output = XmlSerializer::serialize_with_options(
+            "Root",
+            &value,
+            &schema,
+            None,
+            Some(true),
+            Some(&ns_map),
+        )
+        .unwrap();
+        let mut reader = quick_xml::NsReader::from_reader(output.as_slice());
+        let mut nils = 0;
+        loop {
+            let (namespace, event) = reader.read_resolved_event().unwrap();
+            match event {
+                quick_xml::events::Event::Empty(element) => {
+                    assert!(
+                        matches!(namespace, quick_xml::name::ResolveResult::Bound(uri) if uri.as_ref() == "urn:document")
+                    );
+                    for attribute in element.attributes() {
+                        let attribute = attribute.unwrap();
+                        if attribute.key.local_name().as_ref() == "nil" {
+                            let (namespace, _) = reader.resolver().resolve_attribute(attribute.key);
+                            assert!(
+                                matches!(namespace, quick_xml::name::ResolveResult::Bound(uri) if uri.as_ref() == "http://www.w3.org/2001/XMLSchema-instance")
+                            );
+                            nils += 1;
+                        }
+                    }
+                }
+                quick_xml::events::Event::Eof => break,
+                _ => {}
+            }
+        }
+        assert_eq!(nils, 3);
+        assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    }
+    let output =
+        XmlSerializer::serialize_with_options("Root", &value, &schema, None, Some(false), None)
+            .unwrap();
+    assert_eq!(value, deserialize(&output, schema).unwrap());
+}
diff --git a/crates/polyxml-core/tests/test_namespace_entities.rs b/crates/polyxml-core/tests/test_namespace_entities.rs
new file mode 100644
index 0000000..9d92f2a
--- /dev/null
+++ b/crates/polyxml-core/tests/test_namespace_entities.rs
@@ -0,0 +1,90 @@
+use polyxml::schema::{FieldKind, FieldSchema, ModelSchema, ScalarType, ValueType};
+use polyxml::{deserialize, serialize, PolyValue, XmlItemStream};
+use std::{io::Cursor, sync::Arc};
+
+const NS: &str = "urn:polyxml:A&B";
+fn value_field() -> FieldSchema {
+    FieldSchema::new(
+        "value",
+        b"Value",
+        FieldKind::Element,
+        ValueType::Scalar(ScalarType::Int),
+    )
+}
+
+#[test]
+fn escaped_namespace_bindings_match_strict_root_and_round_trip() {
+    let schema = ModelSchema::builder("Root")
+        .namespace(NS)
+        .strict_root(true)
+        .field(value_field())
+        .build();
+    for xml in [
+        "<Root xmlns='urn:polyxml:A&amp;B'><Value>7</Value></Root>",
+        "<p:Root xmlns:p='urn:polyxml:A&#38;B'><p:Value>7</p:Value></p:Root>",
+        "<p:Root xmlns:p='urn:polyxml:A&#x26;B'><p:Value>7</p:Value></p:Root>",
+    ] {
+        let value = deserialize(xml.as_bytes(), Arc::clone(&schema)).unwrap();
+        assert_eq!(value.get("value"), Some(&PolyValue::Int(7)));
+        let output = serialize("Root", &value, &schema, None).unwrap();
+        assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    }
+}
+
+#[test]
+fn namespace_entity_values_are_decoded_once() {
+    let schema = ModelSchema::builder("Root")
+        .namespace("urn:polyxml:literal&amp;")
+        .strict_root(true)
+        .build();
+    let xml = b"<Root xmlns='urn:polyxml:literal&amp;amp;'/>";
+    assert!(deserialize(xml, schema).is_ok());
+}
+
+fn abstract_schema() -> Arc<ModelSchema> {
+    let base = ModelSchema::builder("Root").is_abstract(true).build();
+    let concrete = ModelSchema::builder("Derived")
+        .namespace(NS)
+        .field(value_field())
+        .build();
+    base.set_variants(vec![concrete]);
+    base
+}
+
+#[test]
+fn entity_decoding_applies_to_inherited_and_local_xsi_type_bindings() {
+    let base = abstract_schema();
+    for xml in [
+  "<Root xmlns:t='urn:polyxml:A&amp;B' xmlns:i='http://www.w3.org/2001/XMLSchema-instance' i:type='t:Derived'><Value>9</Value></Root>",
+  "<Root xmlns:t='urn:polyxml:A&#x26;B' xmlns:i='http://www.w3.org/2001/XMLSchema-instance' i:type='t:Derived'/>",
+ ] {
+  let value=deserialize(xml.as_bytes(),Arc::clone(&base)).unwrap();
+  let PolyValue::Record{schema,..}=value else{panic!("expected concrete record")};
+  assert_eq!(schema.name,"Derived");
+ }
+    let xml="<Envelope xmlns:t='urn:polyxml:A&amp;B' xmlns:i='http://www.w3.org/2001/XMLSchema-instance'><Root i:type='t:Derived'><Value>9</Value></Root><Root i:type='t:Derived'/></Envelope>";
+    let mut stream = XmlItemStream::new(Cursor::new(xml.as_bytes()), base, b"Root");
+    for _ in 0..2 {
+        let value = stream.next_item().unwrap().unwrap();
+        let PolyValue::Record { schema, .. } = value else {
+            panic!("expected concrete record")
+        };
+        assert_eq!(schema.name, "Derived");
+    }
+    assert!(stream.next_item().unwrap().is_none());
+}
+
+#[test]
+fn undefined_entities_cannot_form_namespace_bindings() {
+    let schema = ModelSchema::builder("Root").build();
+    for xml in [
+        "<Root xmlns='urn:polyxml:&undefined;'/>",
+        "<Root xmlns:unused='urn:polyxml:&undefined;'></Root>",
+        "<Root><Unknown xmlns:u='urn:&undefined;'></Unknown></Root>",
+    ] {
+        assert!(
+            deserialize(xml.as_bytes(), Arc::clone(&schema)).is_err(),
+            "{xml}"
+        );
+    }
+}
diff --git a/crates/polyxml-core/tests/test_runtime_fast_paths.rs b/crates/polyxml-core/tests/test_runtime_fast_paths.rs
index c0f13f1..07aa439 100644
--- a/crates/polyxml-core/tests/test_runtime_fast_paths.rs
+++ b/crates/polyxml-core/tests/test_runtime_fast_paths.rs
@@ -239,6 +239,8 @@ fn unified_scalar_state_keeps_mixed_branch_order_nil_and_nested_frames() {
         assert_eq!(value,deserialize(&output,Arc::clone(&schema)).unwrap());
     }
     let nil_document = b"<Root xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'><Text xsi:nil='true'/><State>Ready</State></Root>";
-    assert!(deserialize(nil_document, Arc::clone(&schema)).is_ok());
+    let value = deserialize(nil_document, Arc::clone(&schema)).unwrap();
+    let output = serialize("Root", &value, &schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
     assert!(deserialize(b"<Root><State>invalid</State></Root>", schema).is_err());
 }
diff --git a/crates/polyxml-core/tests/test_schema_attribute_entities.rs b/crates/polyxml-core/tests/test_schema_attribute_entities.rs
new file mode 100644
index 0000000..a31540b
--- /dev/null
+++ b/crates/polyxml-core/tests/test_schema_attribute_entities.rs
@@ -0,0 +1,114 @@
+use std::sync::Arc;
+
+use polyxml::ir::{QName, TypeDef, TypeRef};
+use polyxml::schema::ModelSchema;
+use polyxml::schema_parser::XsdParser;
+use polyxml::{deserialize, serialize, PolyValue};
+
+const FIXTURE: &str = include_str!("../../../research/fixtures/schema_attribute_entities.xsd");
+
+#[test]
+fn attribute_entities_reach_enum_facets_and_defaults_in_value_space() {
+    let ir = XsdParser::new().parse_str(FIXTURE).unwrap();
+    let TypeDef::Enum(status) = &ir.types[&QName::local("Status")] else {
+        panic!("Status must be an enum");
+    };
+    assert_eq!(
+        status
+            .variants
+            .iter()
+            .map(|v| v.value.as_str())
+            .collect::<Vec<_>>(),
+        [
+            "R&D",
+            "\"quoted\" 'value' <tag>",
+            "café 😀",
+            "literal &amp;"
+        ]
+    );
+    let TypeDef::Simple(code) = &ir.types[&QName::local("Code")] else {
+        panic!("Code must retain its pattern");
+    };
+    assert_eq!(code.facets.patterns, ["[A-Z]&[A-Z]"]);
+    let schema = ModelSchema::from_ir(&ir, Some("Root")).unwrap();
+    for status in [
+        "R&amp;D",
+        "&quot;quoted&quot; 'value' &lt;tag&gt;",
+        "café 😀",
+        "literal &amp;amp;",
+    ] {
+        let xml =
+            format!("<Root><Status>{status}</Status><Code>A&amp;B</Code><Fixed/><Default/></Root>");
+        let value = deserialize(xml.as_bytes(), Arc::clone(&schema)).unwrap();
+        for (name, expected) in [
+            ("fixed", "R&D"),
+            ("default", "café"),
+            ("label", "<label>"),
+            ("mode", "R&D"),
+            ("code", "A&B"),
+        ] {
+            assert_eq!(value.get(name).and_then(PolyValue::as_str), Some(expected));
+        }
+        let output = serialize("Root", &value, &schema, None).unwrap();
+        assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    }
+    for content in [
+        "<Fixed>wrong</Fixed>",
+        "<Code>wrong</Code>",
+        "<Status>wrong</Status>",
+    ] {
+        assert!(deserialize(
+            format!("<Root>{content}</Root>").as_bytes(),
+            Arc::clone(&schema)
+        )
+        .is_err());
+    }
+}
+
+#[test]
+fn namespace_and_qname_attributes_are_normalized_consistently() {
+    let xml = r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSche&#109;a"
+        xmlns:t="urn:example:a&amp;b" targetNamespace="urn:example:a&#38;b">
+      <xs:simpleType name="Text"><xs:restriction base="xs:str&#105;ng"/></xs:simpleType>
+      <xs:simpleType name="Either"><xs:union memberTypes="t:Te&#120;t&#32;xs:int"/></xs:simpleType>
+      <xs:complexType name="RootType"><xs:sequence>
+        <xs:element name="Value" type="t:Te&#120;t"/>
+      </xs:sequence></xs:complexType>
+      <xs:element name="Root" type="t:RootType"/>
+    </xs:schema>"#;
+    let ir = XsdParser::new().parse_str(xml).unwrap();
+    assert_eq!(ir.target_namespace.as_deref(), Some("urn:example:a&b"));
+    let TypeDef::Union(union) = &ir.types[&QName::new(Some("urn:example:a&b"), "Either")] else {
+        panic!("Either must be a union");
+    };
+    assert_eq!(union.branches.len(), 2);
+    assert_eq!(
+        union.branches[0].type_ref,
+        TypeRef::Named(QName::new(Some("urn:example:a&b"), "Text"))
+    );
+    ModelSchema::from_ir(&ir, Some("Root")).unwrap();
+}
+
+#[test]
+fn literal_attribute_whitespace_is_normalized_but_character_references_survive() {
+    let xml = "<xs:schema xmlns:xs='http://www.w3.org/2001/XMLSchema'><xs:simpleType name='Text'><xs:restriction base='xs:string'><xs:enumeration value='a\tb\r\nc\nd'/><xs:enumeration value='a&#9;b&#10;c&#13;d'/></xs:restriction></xs:simpleType></xs:schema>";
+    let ir = XsdParser::new().parse_str(xml).unwrap();
+    let TypeDef::Enum(text) = &ir.types[&QName::local("Text")] else {
+        panic!("Text must be an enum")
+    };
+    assert_eq!(text.variants[0].value, "a b c d");
+    assert_eq!(text.variants[1].value, "a\tb\nc\rd");
+}
+
+#[test]
+fn malformed_attributes_and_undefined_entities_are_errors_even_in_skipped_content() {
+    for fragment in [
+        "<xs:simpleType name='Text'><xs:restriction base='xs:string'><xs:enumeration value='&missing;'/></xs:restriction></xs:simpleType>",
+        "<xs:complexType name='Root'><xs:attribute name='mode' fixed='&#xNOTHEX;'/></xs:complexType>",
+        "<xs:annotation><xs:appinfo value='&missing;'/></xs:annotation>",
+        "<xs:element name='Root' type='xs:string' type='xs:int'/>",
+    ] {
+        let xml = format!("<xs:schema xmlns:xs='http://www.w3.org/2001/XMLSchema'>{fragment}</xs:schema>");
+        assert!(XsdParser::new().parse_str(&xml).is_err(), "accepted {fragment}");
+    }
+}
diff --git a/crates/polyxml-python/tests/test_generated_models.py b/crates/polyxml-python/tests/test_generated_models.py
index 38741c4..3375b29 100644
--- a/crates/polyxml-python/tests/test_generated_models.py
+++ b/crates/polyxml-python/tests/test_generated_models.py
@@ -1,4 +1,5 @@
 import importlib.util
+import os
 import pathlib
 import shutil
 import subprocess
@@ -262,17 +263,20 @@ def _load_module_from_file(module_name: str, file_path: pathlib.Path):
 def _get_polyxml_bin() -> pathlib.Path:
     repo_root = pathlib.Path(__file__).parent.parent.parent.parent
     exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
-    candidates = [
-        repo_root / "target" / "debug" / exe_name,
-        repo_root / "target" / "release" / exe_name,
-    ]
+    configured_target = os.environ.get("CARGO_TARGET_DIR")
+    target_dir = pathlib.Path(configured_target or "target")
+    if not target_dir.is_absolute():
+        target_dir = repo_root / target_dir
+    target_dir = target_dir.resolve()
+    candidates = [target_dir / profile / exe_name for profile in ("debug", "release")]
     for c in candidates:
         if c.exists():
             return c
 
-    which_path = shutil.which(exe_name) or shutil.which("polyxml")
-    if which_path:
-        return pathlib.Path(which_path)
+    if not configured_target:
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
 
     # Attempt on-the-fly compilation via cargo if not found
     subprocess.run(
@@ -288,6 +292,52 @@ def _get_polyxml_bin() -> pathlib.Path:
     raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
 
 
+@pytest.mark.parametrize("relative", [False, True])
+def test_cli_discovery_respects_cargo_target_directory(tmp_path, monkeypatch, relative):
+    repo_root = tmp_path / "repo"
+    monkeypatch.setitem(
+        _get_polyxml_bin.__globals__,
+        "__file__",
+        str(repo_root / "crates/polyxml-python/tests/test_generated_models.py"),
+    )
+    exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+    stale = repo_root / "target/debug" / exe_name
+    stale.parent.mkdir(parents=True)
+    stale.write_text("old revision")
+    matching = repo_root / "custom-target/debug" / exe_name
+    matching.parent.mkdir(parents=True)
+    matching.write_text("matching revision")
+    monkeypatch.setenv(
+        "CARGO_TARGET_DIR", "custom-target" if relative else str(matching.parent.parent)
+    )
+    monkeypatch.setattr(shutil, "which", lambda _: str(stale))
+    assert _get_polyxml_bin() == matching
+
+
+def test_configured_target_builds_matching_cli_instead_of_using_global(tmp_path, monkeypatch):
+    repo_root = tmp_path / "repo"
+    monkeypatch.setitem(
+        _get_polyxml_bin.__globals__,
+        "__file__",
+        str(repo_root / "crates/polyxml-python/tests/test_generated_models.py"),
+    )
+    exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+    matching = repo_root / "custom-target/debug" / exe_name
+    monkeypatch.setenv("CARGO_TARGET_DIR", str(matching.parent.parent))
+    monkeypatch.setattr(shutil, "which", lambda _: str(tmp_path / "old-global-cli"))
+    builds = []
+
+    def build(command, *, cwd, check, capture_output):
+        builds.append((command, cwd))
+        assert check and capture_output
+        matching.parent.mkdir(parents=True)
+        matching.write_text("matching revision")
+
+    monkeypatch.setattr(subprocess, "run", build)
+    assert _get_polyxml_bin() == matching
+    assert builds == [(["cargo", "build", "-p", "polyxml-cli"], repo_root)]
+
+
 @pytest.fixture(scope="module")
 def generated_models():
     """Generates both Dataclass and Pydantic models from SAMPLE_XSD using polyxml CLI,
diff --git a/research/data/runtime-followups-2026-10-03/default-literals/AttrDecl.txt b/research/data/runtime-followups-2026-10-03/default-literals/AttrDecl.txt
new file mode 100644
index 0000000..edebaa0
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/default-literals/AttrDecl.txt
@@ -0,0 +1,23 @@
+memcap: <=7711 MiB (60% of 12853 MiB available) [systemd MemoryMax, swap off]
+╭────────────────────────────────────────────────────────────╮
+│ PolyXML W3C XML Schema Conformance Suite                   │
+│ Compiler Binary: /tmp/polyxml-followup-default-bin/polyxml │
+│ W3C Submodule: /home/bailey/github/polyxml-w3c-tests/w3c   │
+│ Selected Suite: AttrDecl                                   │
+╰────────────────────────────────────────────────────────────╯
+Executing 50 test group(s)...
+
+  Testing AttrDecl/ad_name00108m5... ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 100% 0:00:00
+
+       W3C XML Schema Conformance Summary        
+┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━┳━━━━━━━━┓
+┃ Category                     ┃ Count ┃   Rate ┃
+┡━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━╇━━━━━━━━┩
+│ Total Test Groups            │    50 │ 100.0% │
+│ Schema Compilations Passed   │    50 │ 100.0% │
+│ Schema Compilations Failed   │     0 │   0.0% │
+│ Valid Instances Evaluated    │    50 │      - │
+│ Roundtrip Validations Passed │    50 │ 100.0% │
+└──────────────────────────────┴───────┴────────┘
+
+All executed tests passed with 100% compliance!
diff --git a/research/data/runtime-followups-2026-10-03/default-literals/CType.txt b/research/data/runtime-followups-2026-10-03/default-literals/CType.txt
new file mode 100644
index 0000000..854d6a9
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/default-literals/CType.txt
@@ -0,0 +1,53 @@
+memcap: <=7722 MiB (60% of 12871 MiB available) [systemd MemoryMax, swap off]
+╭────────────────────────────────────────────────────────────╮
+│ PolyXML W3C XML Schema Conformance Suite                   │
+│ Compiler Binary: /tmp/polyxml-followup-default-bin/polyxml │
+│ W3C Submodule: /home/bailey/github/polyxml-w3c-tests/w3c   │
+│ Selected Suite: CType                                      │
+╰────────────────────────────────────────────────────────────╯
+Executing 31 test group(s)...
+
+  Testing CType/targetns00101m... ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 100% 0:00:00
+
+       W3C XML Schema Conformance Summary        
+┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━┳━━━━━━━━┓
+┃ Category                     ┃ Count ┃   Rate ┃
+┡━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━╇━━━━━━━━┩
+│ Total Test Groups            │    31 │ 100.0% │
+│ Schema Compilations Passed   │    31 │ 100.0% │
+│ Schema Compilations Failed   │     0 │   0.0% │
+│ Valid Instances Evaluated    │    28 │      - │
+│ Roundtrip Validations Passed │    23 │  82.1% │
+└──────────────────────────────┴───────┴────────┘
+
+Failures & Exceptions (5 groups):
+┏━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━┓
+┃                    ┃               ┃     Instances      ┃ Error / First      ┃
+┃ Suite/Group        ┃ Schema Status ┃    (Pass/Total)    ┃ Failure            ┃
+┡━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━┩
+│ CType/basetd00101… │ PASS          │        0/1         │ Positive: FAIL -   │
+│                    │               │                    │ Root.__init__()    │
+│                    │               │                    │ missing 1 required │
+│                    │               │                    │ keyword-only       │
+│                    │               │                    │ argument: 'valu    │
+│ CType/basetd00101… │ PASS          │        0/1         │ Positive: FAIL -   │
+│                    │               │                    │ Root.__init__()    │
+│                    │               │                    │ missing 1 required │
+│                    │               │                    │ keyword-only       │
+│                    │               │                    │ argument: 'valu    │
+│ CType/derivationm… │ PASS          │        0/1         │ Positive: FAIL -   │
+│                    │               │                    │ B.__init__()       │
+│                    │               │                    │ missing 1 required │
+│                    │               │                    │ keyword-only       │
+│                    │               │                    │ argument: 'value'  │
+│ CType/psubstituti… │ PASS          │        1/2         │ pSubstitutions001… │
+│                    │               │                    │ FAIL - Schema      │
+│                    │               │                    │ error: Unexpected  │
+│                    │               │                    │ root element       │
+│                    │               │                    │ {pSubstitu         │
+│ CType/psubstituti… │ PASS          │        1/2         │ pSubstitutions001… │
+│                    │               │                    │ FAIL - Schema      │
+│                    │               │                    │ error: Unexpected  │
+│                    │               │                    │ root element       │
+│                    │               │                    │ {pSubstitu         │
+└────────────────────┴───────────────┴────────────────────┴────────────────────┘
diff --git a/research/data/runtime-followups-2026-10-03/default-literals/NIST.txt b/research/data/runtime-followups-2026-10-03/default-literals/NIST.txt
new file mode 100644
index 0000000..936c268
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/default-literals/NIST.txt
@@ -0,0 +1,32 @@
+memcap: <=7699 MiB (60% of 12832 MiB available) [systemd MemoryMax, swap off]
+╭────────────────────────────────────────────────────────────╮
+│ PolyXML W3C XML Schema Conformance Suite                   │
+│ Compiler Binary: /tmp/polyxml-followup-default-bin/polyxml │
+│ W3C Submodule: /home/bailey/github/polyxml-w3c-tests/w3c   │
+│ Selected Suite: NISTXMLSchemaDatatypes                     │
+╰────────────────────────────────────────────────────────────╯
+Executing 100 test group(s)...
+
+  Testing NIST2004-01-14/atomic-nonPositiveInteger-totalDigits... ━━━━ 100% 0:0…
+
+       W3C XML Schema Conformance Summary        
+┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━┳━━━━━━━━┓
+┃ Category                     ┃ Count ┃   Rate ┃
+┡━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━╇━━━━━━━━┩
+│ Total Test Groups            │   100 │ 100.0% │
+│ Schema Compilations Passed   │   100 │ 100.0% │
+│ Schema Compilations Failed   │     0 │   0.0% │
+│ Valid Instances Evaluated    │   452 │      - │
+│ Roundtrip Validations Passed │   447 │  98.9% │
+└──────────────────────────────┴───────┴────────┘
+
+Failures & Exceptions (1 groups):
+┏━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━┓
+┃                    ┃               ┃     Instances      ┃ Error / First      ┃
+┃ Suite/Group        ┃ Schema Status ┃    (Pass/Total)    ┃ Failure            ┃
+┡━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━┩
+│ NIST2004-01-14/at… │ PASS          │        0/5         │ NISTXML-SV-IV-ato… │
+│                    │               │                    │ FAIL - Scalar      │
+│                    │               │                    │ parse error for    │
+│                    │               │                    │ field 'v           │
+└────────────────────┴───────────────┴────────────────────┴────────────────────┘
diff --git a/research/data/runtime-followups-2026-10-03/default-literals/baseline-generated.py.txt b/research/data/runtime-followups-2026-10-03/default-literals/baseline-generated.py.txt
new file mode 100644
index 0000000..0251025
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/default-literals/baseline-generated.py.txt
@@ -0,0 +1,59 @@
+# @generated by PolyXML Compiler (https://github.com/polyxml/PolyXML)
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from typing import Self
+
+@dataclass(slots=True, kw_only=True)
+class RootType:
+    class Meta:
+        name = "RootType"
+        strict_root = False
+
+    value: str = field(default="\"quoted\"\path\u000a	
+
…
café 😀", metadata={"type": "Element", "name": "Value", "json_name": "Value", "default": "\"quoted\"\\path\\u000a\t\n\r\u{85}\u{2028}café 😀"})
+    fixed: str = field(metadata={"type": "Element", "name": "Fixed", "json_name": "Fixed", "fixed": "\"quoted\"\\path\\u000a\t\n\r\u{85}\u{2028}café 😀"})
+    label: str | None = field(default="\"quoted\"\path\u000a	
+
…
café 😀", metadata={"type": "Attribute", "name": "Label", "json_name": "Label", "default": "\"quoted\"\\path\\u000a\t\n\r\u{85}\u{2028}café 😀"})
+
+    @classmethod
+    def from_xml(cls, data: bytes | str) -> Self:
+        """Deserialize XML bytes or string into this model."""
+        import polyxml
+        raw_bytes = data.encode("utf-8") if isinstance(data, str) else data
+        return polyxml.deserialize(raw_bytes, cls)
+
+    def to_xml(
+        self,
+        *,
+        indent: int | None = None,
+        namespaces: bool | None = None,
+        ns_map: dict[str, str] | None = None,
+    ) -> bytes:
+        """Serialize this model instance into XML bytes."""
+        import polyxml
+        return polyxml.serialize(self, indent=indent, namespaces=namespaces, ns_map=ns_map)
+
+    @classmethod
+    def from_json(cls, data: bytes | str) -> Self:
+        """Deserialize JSON bytes or string into this model."""
+        import polyxml
+        return polyxml.deserialize_json(data, cls)
+
+    def to_json(
+        self,
+        *,
+        indent: int | None = None,
+        by_alias: bool = True,
+    ) -> bytes:
+        """Serialize this model instance into JSON bytes."""
+        import polyxml
+        return polyxml.serialize_json(self, indent=indent, by_alias=by_alias)
+
+@dataclass(slots=True, kw_only=True)
+class Root(RootType):
+    class Meta(RootType.Meta):
+        name = "Root"
+        namespace = ""
+        strict_root = True
+        root_type = RootType
diff --git a/research/data/runtime-followups-2026-10-03/default-literals/baseline-reproduction.txt b/research/data/runtime-followups-2026-10-03/default-literals/baseline-reproduction.txt
new file mode 100644
index 0000000..d87cd5a
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/default-literals/baseline-reproduction.txt
@@ -0,0 +1,8 @@
+Parsing schema: /home/bailey/github/polyxml-default-literals/research/fixtures/default_literal_escaping.xsd
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 1
+Code generation complete.
+  File "/tmp/polyxml-default-literals-baseline-python/default_literal_escaping.py", line 13
+    value: str = field(default="\"quoted\"\path\u000a	
+                               ^
+SyntaxError: unterminated string literal (detected at line 13); perhaps you escaped the end quote?
diff --git a/research/data/runtime-followups-2026-10-03/default-literals/candidate-generated.py.txt b/research/data/runtime-followups-2026-10-03/default-literals/candidate-generated.py.txt
new file mode 100644
index 0000000..5530100
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/default-literals/candidate-generated.py.txt
@@ -0,0 +1,57 @@
+# @generated by PolyXML Compiler (https://github.com/polyxml/PolyXML)
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from typing import Self
+
+@dataclass(slots=True, kw_only=True)
+class RootType:
+    class Meta:
+        name = "RootType"
+        strict_root = False
+
+    value: str = field(default="\"quoted\"\\path\\u000a\t\n\r\u0085\u2028café 😀", metadata={"type": "Element", "name": "Value", "json_name": "Value", "default": "\"quoted\"\\path\\u000a\t\n\r\u0085\u2028café 😀"})
+    fixed: str = field(metadata={"type": "Element", "name": "Fixed", "json_name": "Fixed", "fixed": "\"quoted\"\\path\\u000a\t\n\r\u0085\u2028café 😀"})
+    label: str | None = field(default="\"quoted\"\\path\\u000a\t\n\r\u0085\u2028café 😀", metadata={"type": "Attribute", "name": "Label", "json_name": "Label", "default": "\"quoted\"\\path\\u000a\t\n\r\u0085\u2028café 😀"})
+
+    @classmethod
+    def from_xml(cls, data: bytes | str) -> Self:
+        """Deserialize XML bytes or string into this model."""
+        import polyxml
+        raw_bytes = data.encode("utf-8") if isinstance(data, str) else data
+        return polyxml.deserialize(raw_bytes, cls)
+
+    def to_xml(
+        self,
+        *,
+        indent: int | None = None,
+        namespaces: bool | None = None,
+        ns_map: dict[str, str] | None = None,
+    ) -> bytes:
+        """Serialize this model instance into XML bytes."""
+        import polyxml
+        return polyxml.serialize(self, indent=indent, namespaces=namespaces, ns_map=ns_map)
+
+    @classmethod
+    def from_json(cls, data: bytes | str) -> Self:
+        """Deserialize JSON bytes or string into this model."""
+        import polyxml
+        return polyxml.deserialize_json(data, cls)
+
+    def to_json(
+        self,
+        *,
+        indent: int | None = None,
+        by_alias: bool = True,
+    ) -> bytes:
+        """Serialize this model instance into JSON bytes."""
+        import polyxml
+        return polyxml.serialize_json(self, indent=indent, by_alias=by_alias)
+
+@dataclass(slots=True, kw_only=True)
+class Root(RootType):
+    class Meta(RootType.Meta):
+        name = "Root"
+        namespace = ""
+        strict_root = True
+        root_type = RootType
diff --git a/research/data/runtime-followups-2026-10-03/default-literals/cli-probe.txt b/research/data/runtime-followups-2026-10-03/default-literals/cli-probe.txt
new file mode 100644
index 0000000..04f3db9
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/default-literals/cli-probe.txt
@@ -0,0 +1,9 @@
+Parsing schema: research/fixtures/default_literal_escaping.xsd
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 1
+Code generation complete.
+{
+  "expected": "\"quoted\"\\path\\u000a\t\n\r\u0085\u2028caf\u00e9 \ud83d\ude00",
+  "default": "\"quoted\"\\path\\u000a\t\n\r\u0085\u2028caf\u00e9 \ud83d\ude00",
+  "cli_sha256": "55da9bccc0425fe2c1300c98e1123717f2e61a815567ba3939de0ef50c6c7565"
+}
diff --git a/research/data/runtime-followups-2026-10-03/default-literals/companion-binding.txt b/research/data/runtime-followups-2026-10-03/default-literals/companion-binding.txt
new file mode 100644
index 0000000..7c25f80
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/default-literals/companion-binding.txt
@@ -0,0 +1,10 @@
+memcap: <=7777 MiB (60% of 12962 MiB available) [systemd MemoryMax, swap off]
+🍹 Building a mixed python/rust project
+🐍 Found CPython 3.14 at /home/bailey/github/polyxml-w3c-tests/.venv/bin/python
+🔗 Found pyo3 bindings with abi3-py3.12 support
+📡 Using build options features from pyproject.toml
+Checked 6 packages in 0.47ms
+    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.02s
+📦 Built wheel for abi3 Python ≥ 3.12 to /tmp/.tmpWcsY7w/polyxml-0.34.6-cp312-abi3-linux_x86_64.whl
+✏️ Setting installed package as editable
+🛠 Installed polyxml-0.34.6
diff --git a/research/data/runtime-followups-2026-10-03/default-literals/corpus-comparison.json b/research/data/runtime-followups-2026-10-03/default-literals/corpus-comparison.json
new file mode 100644
index 0000000..7ff6421
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/default-literals/corpus-comparison.json
@@ -0,0 +1,11 @@
+{
+  "CType": {
+    "identical_summary_and_failures": true
+  },
+  "AttrDecl": {
+    "identical_summary_and_failures": true
+  },
+  "NIST": {
+    "identical_summary_and_failures": true
+  }
+}
diff --git a/research/data/runtime-followups-2026-10-03/default-literals/focused-consumers.txt b/research/data/runtime-followups-2026-10-03/default-literals/focused-consumers.txt
new file mode 100644
index 0000000..1f0b7b2
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/default-literals/focused-consumers.txt
@@ -0,0 +1,55 @@
+memcap: <=7739 MiB (60% of 12899 MiB available) [systemd MemoryMax, swap off]
+   Compiling syn v2.0.119
+   Compiling serde v1.0.229
+   Compiling cfg-if v1.0.4
+   Compiling zerocopy v0.8.57
+   Compiling zerocopy-derive v0.8.57
+   Compiling shlex v2.0.1
+   Compiling find-msvc-tools v0.1.12
+   Compiling cc v1.4.5
+   Compiling autocfg v1.5.1
+   Compiling fastrand v2.5.0
+   Compiling num-traits v0.2.19
+   Compiling half v2.7.1
+   Compiling alloca v0.4.0
+   Compiling phf_shared v0.14.0
+   Compiling rustix v1.1.5
+   Compiling either v1.18.0
+   Compiling getrandom v0.4.3
+   Compiling ciborium-io v0.2.2
+   Compiling ciborium-ll v0.2.2
+   Compiling phf_generator v0.14.0
+   Compiling itertools v0.13.0
+   Compiling clap_builder v4.6.7
+   Compiling cast v0.3.0
+   Compiling bitflags v2.13.2
+   Compiling linux-raw-sys v0.12.1
+   Compiling same-file v1.0.6
+   Compiling walkdir v2.5.0
+   Compiling criterion-plot v0.8.2
+   Compiling minijinja v2.24.0
+   Compiling phf_codegen v0.14.0
+   Compiling clap v4.6.7
+   Compiling phf_macros v0.14.0
+   Compiling ciborium v0.2.2
+   Compiling tinytemplate v1.2.1
+   Compiling page_size v0.6.0
+   Compiling quick-xml v0.42.0
+   Compiling yansi v1.0.1
+   Compiling oorandom v11.1.5
+   Compiling diff v0.1.13
+   Compiling anes v0.1.6
+   Compiling once_cell v1.21.4
+   Compiling polyxml v0.34.6 (/home/bailey/github/polyxml-default-literals/crates/polyxml-core)
+   Compiling tempfile v3.27.0
+   Compiling criterion v0.8.2
+   Compiling pretty_assertions v1.4.1
+   Compiling phf v0.14.0
+    Finished `test` profile [unoptimized + debuginfo] target(s) in 26.48s
+     Running tests/test_default_literal_codegen.rs (/home/bailey/github/PolyXML/target/followup-entities-verification/debug/deps/test_default_literal_codegen-2692bac302c8ed5d)
+
+running 1 test
+test generated_string_defaults_and_fixed_values_preserve_xml_characters ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 3.93s
+
diff --git a/research/data/runtime-followups-2026-10-03/default-literals/manifest.json b/research/data/runtime-followups-2026-10-03/default-literals/manifest.json
new file mode 100644
index 0000000..b70291a
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/default-literals/manifest.json
@@ -0,0 +1,58 @@
+{
+  "AttrDecl.txt": {
+    "sha256": "d73b85834c9153f9be0ae2f621f6afedaf7826d8f264d208ff29c527e3a34a5c",
+    "bytes": 1784
+  },
+  "CType.txt": {
+    "sha256": "4ef9c47560aed0ef1a8b651163c5fdea14b5fe5831a1509563ef030f49b7dd2e",
+    "bytes": 4970
+  },
+  "NIST.txt": {
+    "sha256": "ddf82c002fd4720aafe8d74fa0d49f09619193d2a92ec23183e5dbab2fa1a709",
+    "bytes": 2994
+  },
+  "baseline-generated.py.txt": {
+    "sha256": "c66125c0928585c0bd40817717fb9fb268d3d879350dc677bcb814e2fda49fdd",
+    "bytes": 2206
+  },
+  "baseline-reproduction.txt": {
+    "sha256": "01223a5bcb064d6c146bacce42196f6aad63b98f5a3aafcf446dea4665c3118d",
+    "bytes": 503
+  },
+  "candidate-generated.py.txt": {
+    "sha256": "94fe949fe13914d18a6fc1349ec08d139d6782fda534c637508c170f8d05fbaf",
+    "bytes": 2224
+  },
+  "cli-probe.txt": {
+    "sha256": "eb3cae18ddf9655367a3a7a7177eb48f5bb3d6c13fddc8a497f68175122264f3",
+    "bytes": 427
+  },
+  "companion-binding.txt": {
+    "sha256": "5cef6fabdff12503701c85f1175e1858206e6fc7eee8ea87ba2295dc9c65750d",
+    "bytes": 586
+  },
+  "corpus-comparison.json": {
+    "sha256": "44bb1f5f13d114980edb6472ca71591c215c5970fcfceffd0a15bc9d1e20490a",
+    "bytes": 188
+  },
+  "focused-consumers.txt": {
+    "sha256": "745b26713ba7415dbb9a0c4026d66581392e5581e2f6c8fd6969178c78e25909",
+    "bytes": 1958
+  },
+  "native-probe.json": {
+    "sha256": "703399ffbe71231afa356a26fba5a213a53f7a26fbfc533fb2728596b344a83d",
+    "bytes": 202
+  },
+  "quality-gate-missing-target.txt": {
+    "sha256": "647ae9339d02fc25cd83d3de86f811e56d30fb3a86717f17cea6214ad900d65e",
+    "bytes": 277608
+  },
+  "quality-gate.txt": {
+    "sha256": "8789ebdb1cd87682ade6f19f917e87503eac6ede15ba84df66e04ea39a51827c",
+    "bytes": 37508
+  },
+  "seven-backend-cli-smoke.txt": {
+    "sha256": "93d14e4e50af92dffd64a60e9609c9d19a69a655e6d3c6a28d3ffe894e01c281",
+    "bytes": 1060
+  }
+}
diff --git a/research/data/runtime-followups-2026-10-03/default-literals/native-probe.json b/research/data/runtime-followups-2026-10-03/default-literals/native-probe.json
new file mode 100644
index 0000000..7eb9946
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/default-literals/native-probe.json
@@ -0,0 +1,4 @@
+{
+  "native_file": "/home/bailey/github/polyxml-default-literals/crates/polyxml-python/python/polyxml/_polyxml.abi3.so",
+  "sha256": "3fc95d99ccbeac911383f75c6bc1943fc4c51883554de37d2e1ba4332a9aad9d"
+}
diff --git a/research/data/runtime-followups-2026-10-03/default-literals/quality-gate-missing-target.txt b/research/data/runtime-followups-2026-10-03/default-literals/quality-gate-missing-target.txt
new file mode 100644
index 0000000..b812bd7
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/default-literals/quality-gate-missing-target.txt
@@ -0,0 +1,3822 @@
+memcap: <=7774 MiB (60% of 12957 MiB available) [systemd MemoryMax, swap off]
+==> [1/6] Running Rust format check (cargo fmt)...
+==> [2/6] Running Rust Clippy (cargo clippy -D warnings)...
+   Compiling unicode-ident v1.0.24
+   Compiling proc-macro2 v1.0.107
+   Compiling quote v1.0.47
+   Compiling syn v3.0.5
+   Compiling serde_core v1.0.229
+   Compiling serde v1.0.229
+    Checking memchr v2.8.3
+   Compiling serde_derive v1.0.229
+   Compiling syn v2.0.119
+    Checking lexical-util v1.0.7
+   Compiling zmij v1.0.23
+   Compiling serde_json v1.0.151
+    Checking siphasher v1.0.3
+    Checking phf_shared v0.14.0
+    Checking aho-corasick v1.1.5
+    Checking itoa v1.0.18
+    Checking regex-syntax v0.8.11
+    Checking fastrand v2.5.0
+    Checking regex-automata v0.4.18
+    Checking lexical-parse-integer v1.0.6
+    Checking lexical-write-integer v1.0.6
+   Compiling thiserror v2.0.21
+    Checking lexical-write-float v1.0.6
+    Checking lexical-parse-float v1.0.6
+    Checking regex v1.13.1
+    Checking phf_generator v0.14.0
+   Compiling thiserror-impl v2.0.21
+    Checking memo-map v0.3.4
+    Checking minijinja v2.24.0
+    Checking phf_codegen v0.14.0
+    Checking lexical-core v1.0.6
+    Checking quick-xml v0.42.0
+    Checking heck v0.5.0
+    Checking smallvec v1.16.2
+    Checking once_cell v1.21.4
+   Compiling libc v0.2.189
+    Checking polyxml v0.34.6 (/home/bailey/github/polyxml-default-literals/crates/polyxml-core)
+    Checking cfg-if v1.0.4
+    Checking utf8parse v0.2.2
+    Checking anstyle-parse v1.0.0
+    Checking anstyle v1.0.14
+    Checking is_terminal_polyfill v1.70.2
+    Checking colorchoice v1.0.5
+    Checking anstyle-query v1.1.5
+    Checking anstream v1.0.0
+    Checking clap_lex v1.1.0
+    Checking bitflags v2.13.2
+    Checking strsim v0.11.1
+    Checking clap_builder v4.6.7
+   Compiling clap_derive v4.6.7
+    Checking clap v4.6.7
+   Compiling rustix v1.1.5
+   Compiling zerocopy v0.8.57
+   Compiling getrandom v0.4.3
+   Compiling zerocopy-derive v0.8.57
+   Compiling find-msvc-tools v0.1.12
+    Checking linux-raw-sys v0.12.1
+   Compiling shlex v2.0.1
+   Compiling cc v1.4.5
+   Compiling autocfg v1.5.1
+   Compiling num-traits v0.2.19
+    Checking tempfile v3.27.0
+    Checking half v2.7.1
+   Compiling alloca v0.4.0
+    Checking ciborium-io v0.2.2
+    Checking either v1.18.0
+    Checking itertools v0.13.0
+    Checking ciborium-ll v0.2.2
+    Checking cast v0.3.0
+    Checking same-file v1.0.6
+    Checking walkdir v2.5.0
+    Checking criterion-plot v0.8.2
+    Checking ciborium v0.2.2
+   Compiling phf_macros v0.14.0
+    Checking page_size v0.6.0
+    Checking tinytemplate v1.2.1
+    Checking yansi v1.0.1
+    Checking diff v0.1.13
+    Checking anes v0.1.6
+    Checking oorandom v11.1.5
+    Checking criterion v0.8.2
+    Checking pretty_assertions v1.4.1
+    Checking phf v0.14.0
+   Compiling target-lexicon v0.13.5
+   Compiling wasm-bindgen-shared v0.2.129
+   Compiling pyo3-build-config v0.29.2
+   Compiling rustversion v1.0.23
+    Checking winnow v1.0.4
+    Checking toml_parser v1.1.3+spec-1.1.0
+   Compiling pyo3-ffi v0.29.2
+    Checking serde_spanned v1.1.1
+    Checking toml_datetime v1.1.1+spec-1.1.0
+    Checking toml_writer v1.1.2+spec-1.1.0
+    Checking toml v1.1.6+spec-1.1.0
+    Checking glob v0.3.4
+   Compiling bumpalo v3.20.3
+   Compiling unicode-segmentation v1.13.3
+   Compiling convert_case v0.6.0
+   Compiling wasm-bindgen-macro-support v0.2.129
+   Compiling wasm-bindgen v0.2.129
+   Compiling pyo3 v0.29.2
+   Compiling pyo3-macros-backend v0.29.2
+   Compiling napi-build v2.5.0
+   Compiling semver v1.0.28
+   Compiling napi-derive-backend v1.0.75
+   Compiling polyxml-js v0.34.6 (/home/bailey/github/polyxml-default-literals/crates/polyxml-js)
+   Compiling pyo3-macros v0.29.2
+   Compiling wasm-bindgen-macro v0.2.129
+    Checking polyxml-cli v0.34.6 (/home/bailey/github/polyxml-default-literals/crates/polyxml-cli)
+   Compiling ctor v0.2.9
+    Checking napi-sys v2.4.0
+    Checking napi v2.16.17
+   Compiling napi-derive v2.16.13
+    Checking polyxml-wasm v0.34.6 (/home/bailey/github/polyxml-default-literals/crates/polyxml-wasm)
+    Checking polyxml-python v0.34.6 (/home/bailey/github/polyxml-default-literals/crates/polyxml-python)
+    Checking polyxml-c v0.34.6 (/home/bailey/github/polyxml-default-literals/crates/polyxml-c)
+    Finished `dev` profile [unoptimized + debuginfo] target(s) in 47.51s
+==> [3/6] Running Rust workspace tests (cargo test)...
+   Compiling unicode-ident v1.0.24
+   Compiling proc-macro2 v1.0.107
+   Compiling quote v1.0.47
+   Compiling syn v3.0.5
+   Compiling serde_core v1.0.229
+   Compiling siphasher v1.0.3
+   Compiling memchr v2.8.3
+   Compiling regex-syntax v0.8.11
+   Compiling serde_derive v1.0.229
+   Compiling heck v0.5.0
+   Compiling serde v1.0.229
+   Compiling lexical-util v1.0.7
+   Compiling syn v2.0.119
+   Compiling zmij v1.0.23
+   Compiling aho-corasick v1.1.5
+   Compiling phf_shared v0.14.0
+   Compiling cfg-if v1.0.4
+   Compiling itoa v1.0.18
+   Compiling fastrand v2.5.0
+   Compiling serde_json v1.0.151
+   Compiling regex-automata v0.4.18
+   Compiling lexical-write-integer v1.0.6
+   Compiling lexical-parse-integer v1.0.6
+   Compiling once_cell v1.21.4
+   Compiling lexical-parse-float v1.0.6
+   Compiling lexical-write-float v1.0.6
+   Compiling regex v1.13.1
+   Compiling phf_generator v0.14.0
+   Compiling thiserror-impl v2.0.21
+   Compiling memo-map v0.3.4
+   Compiling minijinja v2.24.0
+   Compiling thiserror v2.0.21
+   Compiling phf_codegen v0.14.0
+   Compiling lexical-core v1.0.6
+   Compiling quick-xml v0.42.0
+   Compiling smallvec v1.16.2
+   Compiling libc v0.2.189
+   Compiling polyxml v0.34.6 (/home/bailey/github/polyxml-default-literals/crates/polyxml-core)
+   Compiling utf8parse v0.2.2
+   Compiling anstyle-parse v1.0.0
+   Compiling is_terminal_polyfill v1.70.2
+   Compiling colorchoice v1.0.5
+   Compiling anstyle-query v1.1.5
+   Compiling anstyle v1.0.14
+   Compiling anstream v1.0.0
+   Compiling strsim v0.11.1
+   Compiling clap_lex v1.1.0
+   Compiling clap_builder v4.6.7
+   Compiling clap_derive v4.6.7
+   Compiling bitflags v2.13.2
+   Compiling clap v4.6.7
+   Compiling linux-raw-sys v0.12.1
+   Compiling rustix v1.1.5
+   Compiling getrandom v0.4.3
+   Compiling zerocopy-derive v0.8.57
+   Compiling zerocopy v0.8.57
+   Compiling tempfile v3.27.0
+   Compiling half v2.7.1
+   Compiling ciborium-io v0.2.2
+   Compiling either v1.18.0
+   Compiling itertools v0.13.0
+   Compiling ciborium-ll v0.2.2
+   Compiling cast v0.3.0
+   Compiling same-file v1.0.6
+   Compiling walkdir v2.5.0
+   Compiling criterion-plot v0.8.2
+   Compiling num-traits v0.2.19
+   Compiling alloca v0.4.0
+   Compiling ciborium v0.2.2
+   Compiling phf_macros v0.14.0
+   Compiling page_size v0.6.0
+   Compiling tinytemplate v1.2.1
+   Compiling oorandom v11.1.5
+   Compiling yansi v1.0.1
+   Compiling anes v0.1.6
+   Compiling diff v0.1.13
+   Compiling pretty_assertions v1.4.1
+   Compiling criterion v0.8.2
+   Compiling phf v0.14.0
+   Compiling winnow v1.0.4
+   Compiling toml_parser v1.1.3+spec-1.1.0
+   Compiling serde_spanned v1.1.1
+   Compiling toml_datetime v1.1.1+spec-1.1.0
+   Compiling toml_writer v1.1.2+spec-1.1.0
+   Compiling toml v1.1.6+spec-1.1.0
+   Compiling wasm-bindgen-shared v0.2.129
+   Compiling glob v0.3.4
+   Compiling wasm-bindgen-macro-support v0.2.129
+   Compiling wasm-bindgen-macro v0.2.129
+   Compiling polyxml-cli v0.34.6 (/home/bailey/github/polyxml-default-literals/crates/polyxml-cli)
+   Compiling wasm-bindgen v0.2.129
+   Compiling pyo3-macros-backend v0.29.2
+   Compiling polyxml-js v0.34.6 (/home/bailey/github/polyxml-default-literals/crates/polyxml-js)
+   Compiling napi-derive-backend v1.0.75
+   Compiling pyo3-macros v0.29.2
+   Compiling pyo3-ffi v0.29.2
+   Compiling ctor v0.2.9
+   Compiling napi-sys v2.4.0
+   Compiling napi v2.16.17
+   Compiling pyo3 v0.29.2
+   Compiling napi-derive v2.16.13
+   Compiling polyxml-wasm v0.34.6 (/home/bailey/github/polyxml-default-literals/crates/polyxml-wasm)
+   Compiling polyxml-python v0.34.6 (/home/bailey/github/polyxml-default-literals/crates/polyxml-python)
+   Compiling polyxml-c v0.34.6 (/home/bailey/github/polyxml-default-literals/crates/polyxml-c)
+    Finished `test` profile [unoptimized + debuginfo] target(s) in 1m 20s
+     Running unittests src/lib.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/polyxml-675b717e531d04ed)
+
+running 16 tests
+test integer::tests::comparison_uses_sign_and_magnitude ... ok
+test ir::root_selection_tests::inherited_base_does_not_select_sibling_types ... ok
+test ir::chunker::tests::test_topological_scc_chunking_dag_invariants ... ok
+test ir::root_selection_tests::keeps_references_descendants_and_substitutions ... ok
+test ir::root_selection_tests::rejects_missing_and_ambiguous_roots ... ok
+test json::tests::test_json_deserialization_accepts_python_field_names ... ok
+test json::tests::test_json_roundtrip_primitives ... ok
+test tests::test_deserialization_does_not_confuse_xmlns_with_attributes ... ok
+test tests::test_namespaced_serialization ... ok
+test tests::test_roundtrip_serialization_deserialization ... ok
+test ir::root_selection_tests::field_reference_keeps_substitution_group_members ... ok
+test tests::test_streaming_xml_item_stream ... ok
+test tests::test_nested_elements_and_lists ... ok
+test pattern::tests::bounded_cache_evicts_and_retains_invalid_results ... ok
+test pattern::tests::cache_matches_uncached_regex_under_churn_and_concurrency ... ok
+test pattern::tests::cyclic_working_set_above_capacity_keeps_reusing_entries ... ok
+
+test result: ok. 16 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.15s
+
+     Running tests/test_adversarial_identifiers.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_adversarial_identifiers-34056256ccaa17cb)
+
+running 7 tests
+test test_rust_adversarial_compilation ... ok
+test test_python_adversarial_compilation ... ok
+test test_go_adversarial_compilation ... ok
+test test_cpp_adversarial_compilation ... ok
+test test_java_adversarial_compilation ... ok
+test test_typescript_adversarial_compilation ... ok
+test test_csharp_adversarial_compilation ... ok
+
+test result: ok. 7 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 4.36s
+
+     Running tests/test_any_attribute.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_any_attribute-d5795d9c5e0fdefd)
+
+running 1 test
+test test_any_attribute_schema_parser_and_runtime_roundtrip ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_any_element.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_any_element-1fb225d6616938e8)
+
+running 2 tests
+test test_any_element_schema_parser_and_runtime_roundtrip ... ok
+test test_any_element_go_codegen ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_conformance.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_conformance-0b37810d65fedfce)
+
+running 4 tests
+test test_soap_envelope_conformance ... ok
+test test_ubl_invoice_conformance ... ok
+test test_atom_feed_conformance ... ok
+test test_streaming_catalog_conformance ... ok
+
+test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.02s
+
+     Running tests/test_core.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_core-f4cc1079f88df2bc)
+
+running 9 tests
+test integer_mappings_keep_fixed_width_builtins ... ok
+test test_gregorian_partial_date_lexical_validation ... ok
+test test_malformed_xml_syntax_error ... ok
+test test_error_handling_invalid_scalars ... ok
+test test_all_scalar_types ... ok
+test test_xsi_nil_handling ... ok
+test test_roundtrip_serialization_with_indentation ... ok
+test unbounded_integers_round_trip_and_compare_exact_bounds ... ok
+test test_xsd_gregorian_fields_round_trip_and_reject_invalid_dates ... ok
+
+test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_cpp_codegen.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_cpp_codegen-a4cd5571504c64d5)
+
+running 14 tests
+test test_cpp_cmake_modules_file_set ... ok
+test test_cpp_cmake_and_meson_generation ... ok
+test simple_aliases_follow_their_base_types ... ok
+test test_cpp_glaze_backend_meta_generation ... ok
+test test_cpp_mode_and_backend_from_str_loose ... ok
+test test_cpp_sanitization ... ok
+test mixed_content_self_cycle_compiles ... ok
+test mixed_content_mutual_cycle_compiles ... ok
+Inheritance test passed.
+test test_cpp_inheritance_codegen ... ok
+Recursive tree unique_ptr passed.
+test test_cpp_recursive_cycle_unique_ptr ... ok
+Choice pattern matching passed.
+test test_cpp_choice_variant_compilation ... ok
+All C++20 tests passed successfully.
+test test_cpp_struct_and_enum_codegen_compilation ... ok
+test test_cpp_modules_compilation ... ok
+ISO 20022 pacs.008 C++20 test passed.
+test test_cpp_from_xsd_schema ... ok
+
+test result: ok. 14 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.86s
+
+     Running tests/test_csharp_codegen.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_csharp_codegen-cf32febf6e7f0777)
+
+running 20 tests
+test choice_variants_avoid_record_member_names ... ok
+test emits_unrestricted_simple_types_and_validates_empty_records ... ok
+test test_csharp_any_attribute_codegen ... ok
+test test_csharp_date_or_datetime_lexical_union ... ok
+test test_csharp_record_kind_from_str_loose ... ok
+test test_csharp_sanitization ... ok
+test test_csharp_sequence_nested_inside_choice_codegen ... ok
+test test_csharp_source_gen_context ... ok
+  Determining projects to restore...
+  Restored /tmp/.tmpX3tt8X/PaymentsApp.csproj (in 197 ms).
+  PaymentsApp -> /tmp/.tmpX3tt8X/bin/Debug/net8.0/PaymentsApp.dll
+
+Build succeeded.
+    0 Warning(s)
+    0 Error(s)
+
+Time Elapsed 00:00:01.25
+Choice pattern matching and XML serialization passed!
+test test_csharp_choice_polymorphic_hierarchy ... ok
+test unbounded_integer_xml_preserves_digits ... ok
+test test_csharp_mutable_inheritance_roundtrip ... ok
+  Determining projects to restore...
+  Restored /tmp/.tmpGRg3NP/TreeApp.csproj (in 170 ms).
+  TreeApp -> /tmp/.tmpGRg3NP/bin/Debug/net8.0/TreeApp.dll
+
+Build succeeded.
+    0 Warning(s)
+    0 Error(s)
+
+Time Elapsed 00:00:01.03
+Recursive tree C# tests passed cleanly!
+test test_csharp_recursive_cycle ... ok
+  Determining projects to restore...
+  Restored /tmp/.tmpJhLSyK/CrmApp.csproj (in 168 ms).
+  CrmApp -> /tmp/.tmpJhLSyK/bin/Debug/net8.0/CrmApp.dll
+
+Build succeeded.
+    0 Warning(s)
+    0 Error(s)
+
+Time Elapsed 00:00:01.04
+Customer C# tests passed cleanly!
+test test_csharp_records_and_enums_generation ... ok
+test test_csharp_mutable_wrappers_and_choices_without_validation ... ok
+test test_csharp_simple_content_class_validator_and_unsealed_records ... ok
+test lexical_union_attributes_round_trip ... ok
+test element_defaults_preserve_absence_and_empty_presence ... ok
+test fixed_values_are_enforced_on_read_and_write ... ok
+test nillable_enum_collection_round_trips ... ok
+test particle_wire_structure_round_trips ... ok
+
+test result: ok. 20 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 51.04s
+
+     Running tests/test_default_literal_codegen.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_default_literal_codegen-4c3562e7020c30db)
+
+running 1 test
+test generated_string_defaults_and_fixed_values_preserve_xml_characters ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 1.96s
+
+     Running tests/test_enum_literal_codegen.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_enum_literal_codegen-0c92c71c8d4587d6)
+
+running 1 test
+test enum_literals_compile_and_preserve_values_in_all_seven_languages ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 27.06s
+
+     Running tests/test_go_codegen.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_go_codegen-005c45ed4341be87)
+
+running 25 tests
+test root_alias_names_are_unique_after_go_normalization ... ok
+test referenced_element_uses_declared_type_after_includes ... ok
+test test_go_any_attribute_codegen ... ok
+test test_go_backend_from_str_loose ... ok
+go: creating new go.mod: module payments
+go: to add module requirements and sums:
+	go mod tidy
+test imported_ordered_types_do_not_add_unused_bytes_import ... ok
+test test_go_date_or_datetime_lexical_union ... ok
+test test_go_easyjson_backend ... ok
+test test_go_enum_only_schema_omits_unused_xml_import ... ok
+test repeated_choice_branch_rejects_mixed_and_empty_selections ... ok
+go: creating new go.mod: module tree
+go: to add module requirements and sums:
+	go mod tidy
+test nested_lexical_unions_compile_and_round_trip_in_go ... ok
+test test_go_sanitization ... ok
+test test_go_sonic_backend ... ok
+go: creating new go.mod: module crm
+go: to add module requirements and sums:
+	go mod tidy
+test abstract_substitution_heads_are_rejected ... ok
+test test_go_abstract_xsi_type_dispatch ... ok
+test roots_and_union_attributes_round_trip ... ok
+test separate_choices_enforce_each_group ... ok
+=== RUN   TestChoiceMutualExclusivity
+    payments_test.go:44: Correctly rejected concurrent choice branches: choice ContactChoice mutual exclusivity violation: multiple branches populated (2)
+--- PASS: TestChoiceMutualExclusivity (0.00s)
+PASS
+ok  	payments	0.004s
+test duplicate_choice_names_reject_invalid_branch_shapes ... ok
+test test_go_choice_mutual_exclusivity ... ok
+test temporal_scalars_preserve_xsd_lexical_values ... ok
+test repeated_sequence_groups_enforce_bounds_and_order ... ok
+test test_go_namespaced_element_ref_matching ... ok
+=== RUN   TestRecursiveTree
+--- PASS: TestRecursiveTree (0.00s)
+PASS
+ok  	tree	0.002s
+test test_go_recursive_cycle_pointers ... ok
+=== RUN   TestCustomerRoundtrip
+--- PASS: TestCustomerRoundtrip (0.00s)
+PASS
+ok  	crm	0.002s
+test test_go_struct_and_enum_generation ... ok
+test unbounded_integer_xml_preserves_digits ... ok
+test ordered_particles_and_choice_branches_round_trip ... ok
+
+test result: ok. 25 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 1.03s
+
+     Running tests/test_java_codegen.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_java_codegen-a6078e165fc64681)
+
+running 17 tests
+test test_java_jackson_backend_enum_annotations ... ok
+test test_java_identifier_sanitization ... ok
+test test_java_jackson_backend_from_str_loose ... ok
+test test_java_jackson_backend_simple_type_annotations ... ok
+test test_direct_codec_rejects_wildcards_and_name_collisions ... ok
+test test_java_jackson_backend_struct_annotations ... ok
+test test_java_jackson_backend_union_annotations ... ok
+test test_java_bean_validation_annotations_are_opt_in ... ok
+test test_java_plain_record_inlines_base_fields ... ok
+test jackson3_preserves_core_annotations_and_maps_record_text ... ok
+test test_java_sealed_interface_choice ... ok
+test test_java_module_container_class ... ok
+test test_java_records_and_enums_generation ... ok
+test test_java_plain_record_extension_javac_execute ... ok
+test test_java_record_builder_and_nested_codec_execute ... ok
+test test_java_mutable_builders_and_direct_codecs_execute ... ok
+test test_java_direct_nil_lists_choices_and_namespaces ... ok
+
+test result: ok. 17 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 2.46s
+
+     Running tests/test_json.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_json-74440efee0e911e7)
+
+running 4 tests
+test test_json_scalar_coercion ... ok
+test test_json_nested_objects_and_lists ... ok
+test test_json_primitives_and_alias_modes ... ok
+test test_polyvalue_direct_json_methods ... ok
+
+test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_lexical_lists.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_lexical_lists-0f6750d9c4bf9a3c)
+
+running 2 tests
+test named_list_items_enforce_facets_and_enumerations ... ok
+test typed_lexical_lists_round_trip_across_codecs ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 3.31s
+
+     Running tests/test_lexical_union_codegen.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_lexical_union_codegen-3c208893561d2732)
+
+running 2 tests
+test lexical_union_xml_selects_first_valid_member_and_round_trips ... ok
+test lexical_unions_are_typed_in_all_targets ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_mixed_content.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_mixed_content-1a697ad935ae2797)
+
+running 5 tests
+test mixed_items_field_avoids_existing_attribute_name ... ok
+test parser_builds_ordered_mixed_content_union ... ok
+test mixed_content_preserves_nested_child_order ... ok
+test mixed_content_preserves_text_and_child_order ... ok
+test generated_models_keep_typed_content_items_in_all_targets ... ok
+
+test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_pattern_codegen.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_pattern_codegen-5eee5f9fe2ed3d1a)
+
+running 9 tests
+test generated_typescript_pattern_validation_all_backends ... ok
+test pattern_restrictions_preserve_or_groups_and_inherited_and_steps ... ok
+test gregorian_primitives_emit_validated_types_across_targets ... ok
+test generated_python_pattern_validation ... ok
+test generated_go_pattern_validation_and_xml_roundtrip ... ok
+test generated_java_pattern_validation_and_direct_codecs ... ok
+test generated_cpp_pattern_validation ... ok
+test generated_csharp_pattern_validation ... ok
+test generated_rust_pattern_validation_and_xml_roundtrip ... ok
+
+test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 24.63s
+
+     Running tests/test_python_codegen.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_python_codegen-cc734e908fb39fb6)
+
+running 16 tests
+test test_identifier_sanitization ... ok
+test multiline_xsd_documentation_stays_inside_python_comments ... ok
+test test_python_any_attribute_codegen ... ok
+test test_python_abstract_meta_emission ... ok
+test test_python_any_element_codegen ... ok
+test test_python_codecs_generation ... ok
+test test_python_choice_union_codegen ... ok
+test test_python_aot_codegen ... ok
+test test_python_dataclass_codegen ... ok
+test test_python_generated_tag_and_custom_header ... ok
+test test_python_pydantic_codegen_with_facets ... ok
+test test_python_recursive_type_codegen ... ok
+test test_python_derived_meta_inheritance ... ok
+test test_python_simplecontent_default_factory ... ok
+test test_python_sequence_nested_inside_choice_codegen ... ok
+test quoted_docstrings_preserve_text_and_remain_valid_python ... ok
+
+test result: ok. 16 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.04s
+
+     Running tests/test_qualified_attributes.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_qualified_attributes-f8397a31cf1ecf15)
+
+running 5 tests
+test global_attribute_references_round_trip_by_namespace ... ok
+test imported_inline_global_attribute_enum_round_trips ... ok
+test derived_validators_preserve_base_constraints ... ok
+test inherited_attribute_and_distinct_element_keep_separate_property_names ... ok
+test lexical_dependencies_compile_and_round_trip_without_implicit_imports ... ok
+
+test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 8.31s
+
+     Running tests/test_runtime_fast_paths.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_runtime_fast_paths-7bf9091b7252b7db)
+
+running 6 tests
+test repeated_lexical_lists_keep_whitespace_validation ... ok
+test lexical_list_formatting_preserves_escaping_empty_lists_and_long_numbers ... ok
+test repeated_nested_records_validate_their_own_lexical_lists ... ok
+test indexed_scalar_state_preserves_enum_pattern_and_split_text ... ok
+test cached_patterns_keep_raw_restriction_and_trimmed_pattern_semantics ... ok
+test unified_scalar_state_keeps_mixed_branch_order_nil_and_nested_frames ... ok
+
+test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_rust_codecs.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_rust_codecs-9692e165bd5e14bf)
+
+running 4 tests
+test test_facet_validation_min_max_length ... ok
+test test_empty_element_codec ... ok
+test test_recursive_boxing_roundtrip ... ok
+test test_order_choice_roundtrip ... ok
+
+test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_rust_codegen.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_rust_codegen-8bce8b4b67c7eca3)
+
+running 26 tests
+test test_rust_attribute_codec_loop_syntax ... ok
+test multiline_docs_and_raw_field_names_are_valid_source ... ok
+test test_rust_enum_and_methods ... ok
+test test_rust_digit_prefixed_module_sanitization ... ok
+test test_rust_choice_union_codegen ... ok
+test test_rust_identifier_sanitization ... ok
+test test_rust_codecs_codegen ... ok
+test test_rust_extension_base_cycle_cut ... ok
+test test_rust_phf_dispatch_uniquifies_like_field_metas ... ok
+test test_rust_phf_dispatch_union_groups_branch_tags ... ok
+test test_rust_extension_inlines_base_fields ... ok
+test test_rust_owned_codegen ... ok
+test test_rust_extension_codecs_decode_and_encode_base_fields ... ok
+test test_rust_recursive_cycle_boxing ... ok
+test test_rust_rkyv_derives ... ok
+test test_rust_simple_type_cycle_resilience ... ok
+test test_rust_topological_scc_chunking ... ok
+test test_rust_zero_copy_codegen ... ok
+test test_rust_phf_dispatch_emission ... ok
+test test_rust_simple_content_extension_shadow_rule ... ok
+test test_rust_simple_content_text_codec ... ok
+test test_rust_read_element_text_accumulates_refs_and_cdata ... ok
+test duplicate_wire_names_keep_distinct_json_values ... ok
+test binary_lexical_values_compile_and_round_trip_in_owned_and_borrowed_modes ... ok
+test empty_modules_compile_without_unused_reexports ... ok
+test named_choice_wrappers_round_trip_without_unreachable_dispatch ... ok
+
+test result: ok. 26 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 59.80s
+
+     Running tests/test_schema_attribute_entities.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_schema_attribute_entities-ce76904e09cb1816)
+
+running 4 tests
+test malformed_attributes_and_undefined_entities_are_errors_even_in_skipped_content ... ok
+test literal_attribute_whitespace_is_normalized_but_character_references_survive ... ok
+test namespace_and_qname_attributes_are_normalized_consistently ... ok
+test attribute_entities_reach_enum_facets_and_defaults_in_value_space ... ok
+
+test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_schema_audit.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_schema_audit-24992dfb5b4a626c)
+
+running 13 tests
+test derived_simple_type_inherits_base_patterns ... ok
+test distinct_values_with_colliding_variant_names_stay_unique ... ok
+test duplicate_enumeration_values_are_deduped ... ok
+test all_languages_disambiguate_flat_collision ... ok
+test quick_xml_serde_skips_unknown_elements ... ok
+test generated_rust_has_no_deny_unknown_fields ... ok
+test named_group_reference_fields_are_parsed ... ok
+test chameleon_include_adopts_including_namespace_per_includer ... ok
+test restricted_simple_types_emit_named_aliases ... ok
+test nested_inline_complex_type_is_extracted_not_leaked ... ok
+test rust_flat_output_has_no_colliding_type_names ... ok
+test simple_content_extension_emits_value_field ... ok
+test diamond_includes_do_not_duplicate_upa_source_documents ... ok
+
+test result: ok. 13 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
+
+     Running tests/test_schema_ir.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_schema_ir-f793c1b9895343c7)
+
+running 20 tests
+test global_attribute_reference_uses_declared_type ... ok
+test consumed_particles_do_not_swallow_following_declarations ... ok
+test test_language_context_adapter ... ok
+test inline_list_item_types_preserve_enum_and_union_declarations ... ok
+test test_list_fields_do_not_trigger_spurious_cycles ... ok
+test derived_complex_type_keeps_base_and_bounded_choice ... ok
+test schema_errors_preserve_forward_imports_and_annotation_payloads ... ok
+test missing_included_schema_is_an_error ... ok
+test consumed_child_subtrees_do_not_swallow_following_types ... ok
+test test_tarjan_mutual_recursive_cycle_detection_and_boxing ... ok
+test test_tarjan_self_recursive_cycle_detection_and_boxing ... ok
+test test_parse_lexical_union_member_types_and_inline_members ... ok
+test test_substitution_groups ... ok
+test schema_for_schemas_declared_types_are_not_unknown_builtins ... ok
+test test_minijinja_template_engine_and_filters ... ok
+test xml_prefix_is_available_without_explicit_declaration ... ok
+test test_parse_complex_type_and_facets ... ok
+test imported_inline_global_attribute_types_are_resolved ... ok
+test test_sequence_nested_inside_choice_preserved_in_ir ... ok
+test test_parse_choice_as_union ... ok
+
+test result: ok. 20 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_security.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_security-c3afa670f1d6c619)
+
+running 6 tests
+test test_cdata_section_handling ... ok
+test test_malformed_unclosed_cdata_rejection ... ok
+test test_xml_entity_roundtrip_escaping ... ok
+test test_numeric_character_references ... ok
+test unsupported_general_entities_are_rejected ... ok
+test test_max_depth_recursion_limit ... ok
+
+test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_temporal_union.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_temporal_union-e25d1f9b83e2fdc4)
+
+running 2 tests
+test go_temporal_union_preserves_branches_and_lexicals ... ok
+test csharp_temporal_union_preserves_branches_and_lexicals ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 3.07s
+
+     Running tests/test_transcoder.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_transcoder-6854114408316a2e)
+
+running 6 tests
+test test_schemaless_pretty_transcoding ... ok
+test test_schemaless_preserves_refs_cdata_and_attr_entities ... ok
+test test_transcoder_errors ... ok
+test test_schemaless_xml_to_json_and_back ... ok
+test test_schema_directed_transcoding ... ok
+test test_schema_from_ir_transcoding ... ok
+
+test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_ts_codegen.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_ts_codegen-4e67290c9758f4d9)
+
+running 9 tests
+test test_ts_backend_from_str_loose ... ok
+test test_ts_identifier_sanitization ... ok
+test test_ts_recursive_cycle_zod_lazy ... ok
+test test_ts_discriminated_union_choice ... ok
+test test_ts_interface_and_enum_codegen ... ok
+test test_ts_typebox_schema_generation ... ok
+test test_ts_valibot_schema_generation ... ok
+test test_ts_zod_schema_generation ... ok
+test mixed_content_inheritance_compiles_with_widened_items ... ok
+
+test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.31s
+
+     Running tests/test_ubl_csharp.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_ubl_csharp-b04bc8d2d5f891c2)
+
+running 2 tests
+test unprefixed_xsd_builtin_simple_content_base_uses_default_namespace ... ok
+test multi_namespace_roots_and_inherited_simple_content_compile_and_round_trip ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 3.07s
+
+     Running tests/test_unbounded_choice.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_unbounded_choice-7672e62aa5ecca1a)
+
+running 1 test
+go: creating new go.mod: module testmod
+go: to add module requirements and sums:
+	go mod tidy
+=== RUN   TestUnboundedChoiceOrder
+--- PASS: TestUnboundedChoiceOrder (0.00s)
+PASS
+ok  	testmod	0.002s
+test test_unbounded_choice_ir_and_all_targets ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.15s
+
+     Running tests/test_upa.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_upa-a20019d257c7eac5)
+
+running 6 tests
+test local_form_and_in_scope_qnames_distinguish_namespaces ... ok
+test model_groups_derivation_and_substitution_members_are_checked ... ok
+test imported_groups_and_chameleon_wildcards_keep_source_namespaces ... ok
+test all_groups_and_wildcard_namespaces_are_checked ... ok
+test optional_siblings_and_choice_lookahead_violate_upa ... ok
+test occurrence_ranges_keep_particle_identity_and_count_boundaries ... ok
+
+test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_value_constraints.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_value_constraints-73eb81a96de588c1)
+
+running 2 tests
+test fixed_constraints_cover_input_and_output_in_value_space ... ok
+test repeated_particle_cardinality_belongs_to_the_group ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_xsi_type.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_xsi_type-2c07a0776bd0ec60)
+
+running 11 tests
+test abstract_type_without_derivations_errors ... ok
+test plain_type_attribute_is_not_mistaken_for_dispatch ... ok
+test abstract_type_requires_concrete_selector ... ok
+test from_ir_flattens_base_fields_and_registers_variants ... ok
+test nil_abstract_complex_type_skips_concrete_dispatch ... ok
+test iterparse_dispatches_each_streamed_item ... ok
+test xsi_type_resolves_namespace_inherited_from_parent ... ok
+test unknown_xsi_type_on_abstract_type_errors ... ok
+test root_xsi_type_dispatch_including_empty_element ... ok
+test nested_xsi_type_dispatch_and_round_trip ... ok
+test variant_serialization_requires_namespaces ... ok
+
+test result: ok. 11 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running unittests src/lib.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/polyxml-4ccc220bbd6a27a0)
+
+running 2 tests
+test tests::test_c_abi_nested_list_batch_roundtrip ... ok
+test tests::test_c_abi_namespaced_roundtrip ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running unittests src/lib.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/polyxml_cli-dabf613ae4318f1b)
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running unittests src/main.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/polyxml-cec02944de7101b9)
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_cli.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_cli-714ccf0c30d96734)
+
+running 47 tests
+test fish_completion_filters_values_when_available ... ok
+Loading manifest: /tmp/.tmpoNUbH1/polyxml.toml
+Compiling schema: /tmp/.tmpoNUbH1/model.xsd
+test manifest_generation_does_not_ignore_cli_overrides ... ok
+  Namespace: urn:app
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Emitting target [csharp] into /tmp/.tmpoNUbH1/cs
+Parsing schema: /tmp/.tmpiAx8Ek/customer.xsd
+Emitting target [ts] into /tmp/.tmpoNUbH1/ts
+Emitting target [go] into /tmp/.tmpoNUbH1/go
+Emitting target [rust] into /tmp/.tmpoNUbH1/rs
+Build finished successfully.
+  Namespace: urn:crm
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+test test_cli_build_polyxml_manifest_with_new_features ... ok
+test test_cli_csharp_source_gen_and_record_struct ... ok
+test test_cli_cpp_modules_and_glaze ... ok
+test test_cli_generate_dry_run ... ok
+test test_cli_generate_custom_header_and_generated_tags ... ok
+test jackson3_cli_and_manifest_emit_equivalent_models ... ok
+test python_features_respect_manifest_false_values_and_backend ... ok
+test test_cli_generate_multi_lang ... ok
+test imported_substitution_helpers_do_not_require_spurious_module_owners ... ok
+test test_cli_generate_help ... ok
+Parsing schema: /tmp/.tmpSaODqQ/service.xsd
+  Namespace: urn:service
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+Parsing schema: /tmp/.tmpSaODqQ/service.xsd
+test test_cli_generate_python_backends ... ok
+  Namespace: urn:service
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+test test_cli_help ... ok
+test test_cli_go_easyjson_and_sonic_backend ... ok
+Loading manifest: /tmp/.tmpKarvgd/polyxml.toml
+Compiling schema: /tmp/.tmpKarvgd/schema.xsd
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Emitting target [rust] into /tmp/.tmpKarvgd/rs
+test test_cli_generate_rust_zero_copy_and_owned ... ok
+Emitting target [go] into /tmp/.tmpKarvgd/go
+Emitting target [csharp] into /tmp/.tmpKarvgd/cs
+Build finished successfully.
+test retained_imported_ordered_helpers_belong_to_the_unique_namespace_module ... ok
+test test_cli_manifest_custom_header_workspace_and_target_override ... ok
+test test_cli_python_aot_generation ... ok
+Parsing schema: /tmp/.tmp7RSljQ/event.xsd
+  Namespace: urn:events
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+test test_cli_rust_phf_feature ... ok
+go: creating new go.mod: module crm
+test completion_candidates_follow_target_validation ... ok
+test test_cli_python_aot_rejects_dataclass_style_and_slots ... ok
+go: to add module requirements and sums:
+	go mod tidy
+test test_cli_multiple_root_element_selection ... ok
+Parsing schema: /tmp/.tmpadBDgK/event.xsd
+test invalid_schema_grammar_and_types_fail_before_generation ... ok
+  Namespace: urn:events
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+test test_cli_rust_rkyv_feature ... ok
+Parsing schema: /tmp/.tmppbNjuC/item.xsd
+test test_cli_transcode_bidirectional ... ok
+  Namespace: urn:store
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+Parsing schema: /tmp/.tmppbNjuC/item.xsd
+  Namespace: urn:store
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+test test_cli_typescript_valibot_and_typebox_backend ... ok
+test test_cli_validate_valid_and_invalid ... ok
+test test_polyxml_toml_manifest_build ... ok
+test bash_completion_filters_values_in_the_shell ... ok
+test unified_help_shows_generation_options ... ok
+test test_cli_root_element_selection ... ok
+test test_root_selection_keeps_imported_module_types ... ok
+test test_java_csharp_model_style_options_and_manifest ... ok
+test validate_and_generate_reject_upa_violations ... ok
+test zsh_completion_filters_values_when_available ... ok
+test unified_manifest_forms_generate_identical_output_and_validate_early ... ok
+test unsupported_xsd_alternatives_fail_explicitly ... ok
+test unified_options_fail_before_schema_io_including_dry_run ... ok
+test unified_supported_backends_and_styles_validate ... ok
+=== RUN   TestAccountE2E
+--- PASS: TestAccountE2E (0.00s)
+PASS
+ok  	crm	0.004s
+test test_cli_go_generation ... ok
+E2E C++20 driver passed!
+test test_cli_cpp_generation ... ok
+test test_cli_java_generation ... ok
+test test_cli_shared_modules_deduplication ... ok
+  Determining projects to restore...
+  Restored /tmp/.tmppl9ein/cli_csharp_app/CrmCliApp.csproj (in 224 ms).
+test test_cli_typescript_generation ... ok
+  CrmCliApp -> /tmp/.tmppl9ein/cli_csharp_app/bin/Debug/net8.0/CrmCliApp.dll
+
+Build succeeded.
+    0 Warning(s)
+    0 Error(s)
+
+Time Elapsed 00:00:01.49
+E2E C# CLI test passed successfully!
+test test_cli_csharp_generation ... ok
+test test_cli_rust_split_units_and_chunking ... ok
+
+test result: ok. 47 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 9.62s
+
+     Running unittests src/lib.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/polyxml_js-878a75d7b7901cc9)
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running unittests src/lib.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/_polyxml-a668b0910babaf29)
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running unittests src/lib.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/polyxml_wasm-d510c7f48918b595)
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+   Doc-tests polyxml
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+   Doc-tests polyxml_cli
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+   Doc-tests polyxml_wasm
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+==> [4/6] Compiling Python PyO3 extension (maturin develop)...
+🍹 Building a mixed python/rust project
+🐍 Found CPython 3.14 at /home/bailey/github/polyxml-default-literals/.venv/bin/python
+🔗 Found pyo3 bindings with abi3-py3.12 support
+📡 Using build options features from pyproject.toml
+Using Python 3.14.4 environment at: /home/bailey/github/polyxml-default-literals/.venv
+Checked 6 packages in 34ms
+   Compiling syn v3.0.5
+   Compiling serde_core v1.0.229
+   Compiling serde_derive v1.0.229
+   Compiling serde v1.0.229
+   Compiling pyo3-ffi v0.29.2
+   Compiling syn v2.0.119
+   Compiling fastrand v2.5.0
+   Compiling phf_generator v0.14.0
+   Compiling pyo3-macros-backend v0.29.2
+   Compiling thiserror-impl v2.0.21
+   Compiling minijinja v2.24.0
+   Compiling serde_json v1.0.151
+   Compiling thiserror v2.0.21
+   Compiling pyo3 v0.29.2
+   Compiling pyo3-macros v0.29.2
+   Compiling phf_codegen v0.14.0
+   Compiling quick-xml v0.42.0
+   Compiling polyxml v0.34.6 (/home/bailey/github/polyxml-default-literals/crates/polyxml-core)
+   Compiling polyxml-python v0.34.6 (/home/bailey/github/polyxml-default-literals/crates/polyxml-python)
+    Finished `dev` profile [unoptimized + debuginfo] target(s) in 24.55s
+📦 Built wheel for abi3 Python ≥ 3.12 to /tmp/.tmpp6ZXi1/polyxml-0.34.6-cp312-abi3-linux_x86_64.whl
+✏️ Setting installed package as editable
+🛠 Installed polyxml-0.34.6
+==> [5/6] Running Python Ruff checks...
+All checks passed!
+10 files already formatted
+==> [6/6] Running Python tests with 100% statement & branch coverage...
+....FFFFFFFFFFFFFEEEEEFFFFFFFFFFFFFFFFFFFFFFF........................... [ 64%]
+........................................                                 [100%]
+==================================== ERRORS ====================================
+____________ ERROR at setup of test_declared_root_models[dataclass] ____________
+
+    @pytest.fixture(scope="module")
+    def generated_models():
+        """Generates both Dataclass and Pydantic models from SAMPLE_XSD using polyxml CLI,
+        verifying ruff and pyright compliance."""
+>       polyxml_bin = _get_polyxml_bin()
+                      ^^^^^^^^^^^^^^^^^^
+
+tests/test_generated_models.py:295: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+____________ ERROR at setup of test_declared_root_models[pydantic] _____________
+
+    @pytest.fixture(scope="module")
+    def generated_models():
+        """Generates both Dataclass and Pydantic models from SAMPLE_XSD using polyxml CLI,
+        verifying ruff and pyright compliance."""
+>       polyxml_bin = _get_polyxml_bin()
+                      ^^^^^^^^^^^^^^^^^^
+
+tests/test_generated_models.py:295: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+_ ERROR at setup of test_generated_dataclass_deserialization_and_serialization _
+
+    @pytest.fixture(scope="module")
+    def generated_models():
+        """Generates both Dataclass and Pydantic models from SAMPLE_XSD using polyxml CLI,
+        verifying ruff and pyright compliance."""
+>       polyxml_bin = _get_polyxml_bin()
+                      ^^^^^^^^^^^^^^^^^^
+
+tests/test_generated_models.py:295: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+_ ERROR at setup of test_generated_pydantic_deserialization_and_serialization __
+
+    @pytest.fixture(scope="module")
+    def generated_models():
+        """Generates both Dataclass and Pydantic models from SAMPLE_XSD using polyxml CLI,
+        verifying ruff and pyright compliance."""
+>       polyxml_bin = _get_polyxml_bin()
+                      ^^^^^^^^^^^^^^^^^^
+
+tests/test_generated_models.py:295: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+______________ ERROR at setup of test_generated_dataclass_codecs _______________
+
+    @pytest.fixture(scope="module")
+    def generated_models():
+        """Generates both Dataclass and Pydantic models from SAMPLE_XSD using polyxml CLI,
+        verifying ruff and pyright compliance."""
+>       polyxml_bin = _get_polyxml_bin()
+                      ^^^^^^^^^^^^^^^^^^
+
+tests/test_generated_models.py:295: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+=================================== FAILURES ===================================
+______ test_generated_abstract_root_preserves_derived_payload[dataclass] _______
+
+tmp_path = PosixPath('/tmp/pytest-of-bailey/pytest-14/test_generated_abstract_root_p0')
+backend = 'dataclass'
+
+    @pytest.mark.parametrize("backend", ["dataclass", "pydantic"])
+    def test_generated_abstract_root_preserves_derived_payload(tmp_path, backend):
+        schema = (
+            pathlib.Path(__file__).resolve().parents[3]
+            / "research/fixtures/wave6/abstract_derived_xsi.xsd"
+        )
+        subprocess.run(
+            [
+>               str(_get_polyxml_bin()),
+                    ^^^^^^^^^^^^^^^^^^
+                "generate",
+                str(schema),
+                "--lang",
+                "python",
+                "--backend",
+                backend,
+                "--out",
+                str(tmp_path),
+            ],
+            check=True,
+            capture_output=True,
+        )
+
+tests/test_generated_models.py:23: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+_______ test_generated_abstract_root_preserves_derived_payload[pydantic] _______
+
+tmp_path = PosixPath('/tmp/pytest-of-bailey/pytest-14/test_generated_abstract_root_p1')
+backend = 'pydantic'
+
+    @pytest.mark.parametrize("backend", ["dataclass", "pydantic"])
+    def test_generated_abstract_root_preserves_derived_payload(tmp_path, backend):
+        schema = (
+            pathlib.Path(__file__).resolve().parents[3]
+            / "research/fixtures/wave6/abstract_derived_xsi.xsd"
+        )
+        subprocess.run(
+            [
+>               str(_get_polyxml_bin()),
+                    ^^^^^^^^^^^^^^^^^^
+                "generate",
+                str(schema),
+                "--lang",
+                "python",
+                "--backend",
+                backend,
+                "--out",
+                str(tmp_path),
+            ],
+            check=True,
+            capture_output=True,
+        )
+
+tests/test_generated_models.py:23: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+__________ test_roots_with_the_same_local_name_in_distinct_namespaces __________
+
+tmp_path = PosixPath('/tmp/pytest-of-bailey/pytest-14/test_roots_with_the_same_local0')
+
+    def test_roots_with_the_same_local_name_in_distinct_namespaces(tmp_path):
+        base = tmp_path / "base.xsd"
+        base.write_text(
+            '<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" targetNamespace="urn:base" xmlns:b="urn:base"><xs:complexType name="A"><xs:sequence><xs:element name="BaseValue" type="xs:string"/></xs:sequence></xs:complexType><xs:element name="a" type="b:A"/></xs:schema>'
+        )
+        main = tmp_path / "main.xsd"
+        main.write_text(
+            '<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" targetNamespace="urn:main" xmlns:m="urn:main"><xs:import namespace="urn:base" schemaLocation="base.xsd"/><xs:complexType name="A"><xs:sequence><xs:element name="MainValue" type="xs:string"/></xs:sequence></xs:complexType><xs:element name="a" type="m:A"/></xs:schema>'
+        )
+        out = tmp_path / "models"
+        subprocess.run(
+>           [str(_get_polyxml_bin()), "generate", str(main), "--lang", "python", "--out", str(out)],
+                 ^^^^^^^^^^^^^^^^^^
+            check=True,
+            capture_output=True,
+        )
+
+tests/test_generated_models.py:64: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+_ test_particle_codec_regressions[nested_sequence_choice.xsd-Root-documents0-dataclass] _
+
+tmp_path = PosixPath('/tmp/pytest-of-bailey/pytest-14/test_particle_codec_regression0')
+backend = 'dataclass', fixture = 'nested_sequence_choice.xsd'
+root_name = 'Root'
+documents = ['<Root><First>A</First><Second>B</Second></Root>', '<Root><Alternative>C</Alternative></Root>']
+
+    @pytest.mark.parametrize("backend", ["dataclass", "pydantic"])
+    @pytest.mark.parametrize(
+        ("fixture", "root_name", "documents"),
+        [
+            (
+                "nested_sequence_choice.xsd",
+                "Root",
+                [
+                    "<Root><First>A</First><Second>B</Second></Root>",
+                    "<Root><Alternative>C</Alternative></Root>",
+                ],
+            ),
+            (
+                "repeated_sequence.xsd",
+                "Root",
+                [
+                    "<Root><First>A1</First><Second>B1</Second><First>A2</First><Second>B2</Second></Root>",
+                    "<Root/>",
+                ],
+            ),
+            (
+                "substitution_group.xsd",
+                "Portfolio",
+                [
+                    "<Portfolio xmlns='urn:audit:substitution'><Bond>A1</Bond><Equity>B1</Equity><Bond>A2</Bond></Portfolio>"
+                ],
+            ),
+            (
+                "choice_branch_cardinality.xsd",
+                "Root",
+                [
+                    "<Root><Timing>A1</Timing><Timing>A2</Timing></Root>",
+                    "<Root><Drive>B</Drive></Root>",
+                ],
+            ),
+            (
+                "wave6/duplicate_choice_branch_name.xsd",
+                "Person",
+                [
+                    "<Person><MinAge>18</MinAge><MaxAge>25</MaxAge></Person>",
+                    "<Person><MaxAge>25</MaxAge></Person>",
+                    "<Person/>",
+                ],
+            ),
+        ],
+    )
+    def test_particle_codec_regressions(tmp_path, backend, fixture, root_name, documents):
+        schema = pathlib.Path(__file__).resolve().parents[3] / "research" / "fixtures" / fixture
+        subprocess.run(
+            [
+>               str(_get_polyxml_bin()),
+                    ^^^^^^^^^^^^^^^^^^
+                "generate",
+                str(schema),
+                "--lang",
+                "python",
+                "--backend",
+                backend,
+                "--out",
+                str(tmp_path),
+            ],
+            check=True,
+            capture_output=True,
+        )
+
+tests/test_generated_models.py:126: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+_ test_particle_codec_regressions[nested_sequence_choice.xsd-Root-documents0-pydantic] _
+
+tmp_path = PosixPath('/tmp/pytest-of-bailey/pytest-14/test_particle_codec_regression1')
+backend = 'pydantic', fixture = 'nested_sequence_choice.xsd', root_name = 'Root'
+documents = ['<Root><First>A</First><Second>B</Second></Root>', '<Root><Alternative>C</Alternative></Root>']
+
+    @pytest.mark.parametrize("backend", ["dataclass", "pydantic"])
+    @pytest.mark.parametrize(
+        ("fixture", "root_name", "documents"),
+        [
+            (
+                "nested_sequence_choice.xsd",
+                "Root",
+                [
+                    "<Root><First>A</First><Second>B</Second></Root>",
+                    "<Root><Alternative>C</Alternative></Root>",
+                ],
+            ),
+            (
+                "repeated_sequence.xsd",
+                "Root",
+                [
+                    "<Root><First>A1</First><Second>B1</Second><First>A2</First><Second>B2</Second></Root>",
+                    "<Root/>",
+                ],
+            ),
+            (
+                "substitution_group.xsd",
+                "Portfolio",
+                [
+                    "<Portfolio xmlns='urn:audit:substitution'><Bond>A1</Bond><Equity>B1</Equity><Bond>A2</Bond></Portfolio>"
+                ],
+            ),
+            (
+                "choice_branch_cardinality.xsd",
+                "Root",
+                [
+                    "<Root><Timing>A1</Timing><Timing>A2</Timing></Root>",
+                    "<Root><Drive>B</Drive></Root>",
+                ],
+            ),
+            (
+                "wave6/duplicate_choice_branch_name.xsd",
+                "Person",
+                [
+                    "<Person><MinAge>18</MinAge><MaxAge>25</MaxAge></Person>",
+                    "<Person><MaxAge>25</MaxAge></Person>",
+                    "<Person/>",
+                ],
+            ),
+        ],
+    )
+    def test_particle_codec_regressions(tmp_path, backend, fixture, root_name, documents):
+        schema = pathlib.Path(__file__).resolve().parents[3] / "research" / "fixtures" / fixture
+        subprocess.run(
+            [
+>               str(_get_polyxml_bin()),
+                    ^^^^^^^^^^^^^^^^^^
+                "generate",
+                str(schema),
+                "--lang",
+                "python",
+                "--backend",
+                backend,
+                "--out",
+                str(tmp_path),
+            ],
+            check=True,
+            capture_output=True,
+        )
+
+tests/test_generated_models.py:126: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+_ test_particle_codec_regressions[repeated_sequence.xsd-Root-documents1-dataclass] _
+
+tmp_path = PosixPath('/tmp/pytest-of-bailey/pytest-14/test_particle_codec_regression2')
+backend = 'dataclass', fixture = 'repeated_sequence.xsd', root_name = 'Root'
+documents = ['<Root><First>A1</First><Second>B1</Second><First>A2</First><Second>B2</Second></Root>', '<Root/>']
+
+    @pytest.mark.parametrize("backend", ["dataclass", "pydantic"])
+    @pytest.mark.parametrize(
+        ("fixture", "root_name", "documents"),
+        [
+            (
+                "nested_sequence_choice.xsd",
+                "Root",
+                [
+                    "<Root><First>A</First><Second>B</Second></Root>",
+                    "<Root><Alternative>C</Alternative></Root>",
+                ],
+            ),
+            (
+                "repeated_sequence.xsd",
+                "Root",
+                [
+                    "<Root><First>A1</First><Second>B1</Second><First>A2</First><Second>B2</Second></Root>",
+                    "<Root/>",
+                ],
+            ),
+            (
+                "substitution_group.xsd",
+                "Portfolio",
+                [
+                    "<Portfolio xmlns='urn:audit:substitution'><Bond>A1</Bond><Equity>B1</Equity><Bond>A2</Bond></Portfolio>"
+                ],
+            ),
+            (
+                "choice_branch_cardinality.xsd",
+                "Root",
+                [
+                    "<Root><Timing>A1</Timing><Timing>A2</Timing></Root>",
+                    "<Root><Drive>B</Drive></Root>",
+                ],
+            ),
+            (
+                "wave6/duplicate_choice_branch_name.xsd",
+                "Person",
+                [
+                    "<Person><MinAge>18</MinAge><MaxAge>25</MaxAge></Person>",
+                    "<Person><MaxAge>25</MaxAge></Person>",
+                    "<Person/>",
+                ],
+            ),
+        ],
+    )
+    def test_particle_codec_regressions(tmp_path, backend, fixture, root_name, documents):
+        schema = pathlib.Path(__file__).resolve().parents[3] / "research" / "fixtures" / fixture
+        subprocess.run(
+            [
+>               str(_get_polyxml_bin()),
+                    ^^^^^^^^^^^^^^^^^^
+                "generate",
+                str(schema),
+                "--lang",
+                "python",
+                "--backend",
+                backend,
+                "--out",
+                str(tmp_path),
+            ],
+            check=True,
+            capture_output=True,
+        )
+
+tests/test_generated_models.py:126: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+_ test_particle_codec_regressions[repeated_sequence.xsd-Root-documents1-pydantic] _
+
+tmp_path = PosixPath('/tmp/pytest-of-bailey/pytest-14/test_particle_codec_regression3')
+backend = 'pydantic', fixture = 'repeated_sequence.xsd', root_name = 'Root'
+documents = ['<Root><First>A1</First><Second>B1</Second><First>A2</First><Second>B2</Second></Root>', '<Root/>']
+
+    @pytest.mark.parametrize("backend", ["dataclass", "pydantic"])
+    @pytest.mark.parametrize(
+        ("fixture", "root_name", "documents"),
+        [
+            (
+                "nested_sequence_choice.xsd",
+                "Root",
+                [
+                    "<Root><First>A</First><Second>B</Second></Root>",
+                    "<Root><Alternative>C</Alternative></Root>",
+                ],
+            ),
+            (
+                "repeated_sequence.xsd",
+                "Root",
+                [
+                    "<Root><First>A1</First><Second>B1</Second><First>A2</First><Second>B2</Second></Root>",
+                    "<Root/>",
+                ],
+            ),
+            (
+                "substitution_group.xsd",
+                "Portfolio",
+                [
+                    "<Portfolio xmlns='urn:audit:substitution'><Bond>A1</Bond><Equity>B1</Equity><Bond>A2</Bond></Portfolio>"
+                ],
+            ),
+            (
+                "choice_branch_cardinality.xsd",
+                "Root",
+                [
+                    "<Root><Timing>A1</Timing><Timing>A2</Timing></Root>",
+                    "<Root><Drive>B</Drive></Root>",
+                ],
+            ),
+            (
+                "wave6/duplicate_choice_branch_name.xsd",
+                "Person",
+                [
+                    "<Person><MinAge>18</MinAge><MaxAge>25</MaxAge></Person>",
+                    "<Person><MaxAge>25</MaxAge></Person>",
+                    "<Person/>",
+                ],
+            ),
+        ],
+    )
+    def test_particle_codec_regressions(tmp_path, backend, fixture, root_name, documents):
+        schema = pathlib.Path(__file__).resolve().parents[3] / "research" / "fixtures" / fixture
+        subprocess.run(
+            [
+>               str(_get_polyxml_bin()),
+                    ^^^^^^^^^^^^^^^^^^
+                "generate",
+                str(schema),
+                "--lang",
+                "python",
+                "--backend",
+                backend,
+                "--out",
+                str(tmp_path),
+            ],
+            check=True,
+            capture_output=True,
+        )
+
+tests/test_generated_models.py:126: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+_ test_particle_codec_regressions[substitution_group.xsd-Portfolio-documents2-dataclass] _
+
+tmp_path = PosixPath('/tmp/pytest-of-bailey/pytest-14/test_particle_codec_regression4')
+backend = 'dataclass', fixture = 'substitution_group.xsd'
+root_name = 'Portfolio'
+documents = ["<Portfolio xmlns='urn:audit:substitution'><Bond>A1</Bond><Equity>B1</Equity><Bond>A2</Bond></Portfolio>"]
+
+    @pytest.mark.parametrize("backend", ["dataclass", "pydantic"])
+    @pytest.mark.parametrize(
+        ("fixture", "root_name", "documents"),
+        [
+            (
+                "nested_sequence_choice.xsd",
+                "Root",
+                [
+                    "<Root><First>A</First><Second>B</Second></Root>",
+                    "<Root><Alternative>C</Alternative></Root>",
+                ],
+            ),
+            (
+                "repeated_sequence.xsd",
+                "Root",
+                [
+                    "<Root><First>A1</First><Second>B1</Second><First>A2</First><Second>B2</Second></Root>",
+                    "<Root/>",
+                ],
+            ),
+            (
+                "substitution_group.xsd",
+                "Portfolio",
+                [
+                    "<Portfolio xmlns='urn:audit:substitution'><Bond>A1</Bond><Equity>B1</Equity><Bond>A2</Bond></Portfolio>"
+                ],
+            ),
+            (
+                "choice_branch_cardinality.xsd",
+                "Root",
+                [
+                    "<Root><Timing>A1</Timing><Timing>A2</Timing></Root>",
+                    "<Root><Drive>B</Drive></Root>",
+                ],
+            ),
+            (
+                "wave6/duplicate_choice_branch_name.xsd",
+                "Person",
+                [
+                    "<Person><MinAge>18</MinAge><MaxAge>25</MaxAge></Person>",
+                    "<Person><MaxAge>25</MaxAge></Person>",
+                    "<Person/>",
+                ],
+            ),
+        ],
+    )
+    def test_particle_codec_regressions(tmp_path, backend, fixture, root_name, documents):
+        schema = pathlib.Path(__file__).resolve().parents[3] / "research" / "fixtures" / fixture
+        subprocess.run(
+            [
+>               str(_get_polyxml_bin()),
+                    ^^^^^^^^^^^^^^^^^^
+                "generate",
+                str(schema),
+                "--lang",
+                "python",
+                "--backend",
+                backend,
+                "--out",
+                str(tmp_path),
+            ],
+            check=True,
+            capture_output=True,
+        )
+
+tests/test_generated_models.py:126: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+_ test_particle_codec_regressions[substitution_group.xsd-Portfolio-documents2-pydantic] _
+
+tmp_path = PosixPath('/tmp/pytest-of-bailey/pytest-14/test_particle_codec_regression5')
+backend = 'pydantic', fixture = 'substitution_group.xsd'
+root_name = 'Portfolio'
+documents = ["<Portfolio xmlns='urn:audit:substitution'><Bond>A1</Bond><Equity>B1</Equity><Bond>A2</Bond></Portfolio>"]
+
+    @pytest.mark.parametrize("backend", ["dataclass", "pydantic"])
+    @pytest.mark.parametrize(
+        ("fixture", "root_name", "documents"),
+        [
+            (
+                "nested_sequence_choice.xsd",
+                "Root",
+                [
+                    "<Root><First>A</First><Second>B</Second></Root>",
+                    "<Root><Alternative>C</Alternative></Root>",
+                ],
+            ),
+            (
+                "repeated_sequence.xsd",
+                "Root",
+                [
+                    "<Root><First>A1</First><Second>B1</Second><First>A2</First><Second>B2</Second></Root>",
+                    "<Root/>",
+                ],
+            ),
+            (
+                "substitution_group.xsd",
+                "Portfolio",
+                [
+                    "<Portfolio xmlns='urn:audit:substitution'><Bond>A1</Bond><Equity>B1</Equity><Bond>A2</Bond></Portfolio>"
+                ],
+            ),
+            (
+                "choice_branch_cardinality.xsd",
+                "Root",
+                [
+                    "<Root><Timing>A1</Timing><Timing>A2</Timing></Root>",
+                    "<Root><Drive>B</Drive></Root>",
+                ],
+            ),
+            (
+                "wave6/duplicate_choice_branch_name.xsd",
+                "Person",
+                [
+                    "<Person><MinAge>18</MinAge><MaxAge>25</MaxAge></Person>",
+                    "<Person><MaxAge>25</MaxAge></Person>",
+                    "<Person/>",
+                ],
+            ),
+        ],
+    )
+    def test_particle_codec_regressions(tmp_path, backend, fixture, root_name, documents):
+        schema = pathlib.Path(__file__).resolve().parents[3] / "research" / "fixtures" / fixture
+        subprocess.run(
+            [
+>               str(_get_polyxml_bin()),
+                    ^^^^^^^^^^^^^^^^^^
+                "generate",
+                str(schema),
+                "--lang",
+                "python",
+                "--backend",
+                backend,
+                "--out",
+                str(tmp_path),
+            ],
+            check=True,
+            capture_output=True,
+        )
+
+tests/test_generated_models.py:126: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+_ test_particle_codec_regressions[choice_branch_cardinality.xsd-Root-documents3-dataclass] _
+
+tmp_path = PosixPath('/tmp/pytest-of-bailey/pytest-14/test_particle_codec_regression6')
+backend = 'dataclass', fixture = 'choice_branch_cardinality.xsd'
+root_name = 'Root'
+documents = ['<Root><Timing>A1</Timing><Timing>A2</Timing></Root>', '<Root><Drive>B</Drive></Root>']
+
+    @pytest.mark.parametrize("backend", ["dataclass", "pydantic"])
+    @pytest.mark.parametrize(
+        ("fixture", "root_name", "documents"),
+        [
+            (
+                "nested_sequence_choice.xsd",
+                "Root",
+                [
+                    "<Root><First>A</First><Second>B</Second></Root>",
+                    "<Root><Alternative>C</Alternative></Root>",
+                ],
+            ),
+            (
+                "repeated_sequence.xsd",
+                "Root",
+                [
+                    "<Root><First>A1</First><Second>B1</Second><First>A2</First><Second>B2</Second></Root>",
+                    "<Root/>",
+                ],
+            ),
+            (
+                "substitution_group.xsd",
+                "Portfolio",
+                [
+                    "<Portfolio xmlns='urn:audit:substitution'><Bond>A1</Bond><Equity>B1</Equity><Bond>A2</Bond></Portfolio>"
+                ],
+            ),
+            (
+                "choice_branch_cardinality.xsd",
+                "Root",
+                [
+                    "<Root><Timing>A1</Timing><Timing>A2</Timing></Root>",
+                    "<Root><Drive>B</Drive></Root>",
+                ],
+            ),
+            (
+                "wave6/duplicate_choice_branch_name.xsd",
+                "Person",
+                [
+                    "<Person><MinAge>18</MinAge><MaxAge>25</MaxAge></Person>",
+                    "<Person><MaxAge>25</MaxAge></Person>",
+                    "<Person/>",
+                ],
+            ),
+        ],
+    )
+    def test_particle_codec_regressions(tmp_path, backend, fixture, root_name, documents):
+        schema = pathlib.Path(__file__).resolve().parents[3] / "research" / "fixtures" / fixture
+        subprocess.run(
+            [
+>               str(_get_polyxml_bin()),
+                    ^^^^^^^^^^^^^^^^^^
+                "generate",
+                str(schema),
+                "--lang",
+                "python",
+                "--backend",
+                backend,
+                "--out",
+                str(tmp_path),
+            ],
+            check=True,
+            capture_output=True,
+        )
+
+tests/test_generated_models.py:126: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+_ test_particle_codec_regressions[choice_branch_cardinality.xsd-Root-documents3-pydantic] _
+
+tmp_path = PosixPath('/tmp/pytest-of-bailey/pytest-14/test_particle_codec_regression7')
+backend = 'pydantic', fixture = 'choice_branch_cardinality.xsd'
+root_name = 'Root'
+documents = ['<Root><Timing>A1</Timing><Timing>A2</Timing></Root>', '<Root><Drive>B</Drive></Root>']
+
+    @pytest.mark.parametrize("backend", ["dataclass", "pydantic"])
+    @pytest.mark.parametrize(
+        ("fixture", "root_name", "documents"),
+        [
+            (
+                "nested_sequence_choice.xsd",
+                "Root",
+                [
+                    "<Root><First>A</First><Second>B</Second></Root>",
+                    "<Root><Alternative>C</Alternative></Root>",
+                ],
+            ),
+            (
+                "repeated_sequence.xsd",
+                "Root",
+                [
+                    "<Root><First>A1</First><Second>B1</Second><First>A2</First><Second>B2</Second></Root>",
+                    "<Root/>",
+                ],
+            ),
+            (
+                "substitution_group.xsd",
+                "Portfolio",
+                [
+                    "<Portfolio xmlns='urn:audit:substitution'><Bond>A1</Bond><Equity>B1</Equity><Bond>A2</Bond></Portfolio>"
+                ],
+            ),
+            (
+                "choice_branch_cardinality.xsd",
+                "Root",
+                [
+                    "<Root><Timing>A1</Timing><Timing>A2</Timing></Root>",
+                    "<Root><Drive>B</Drive></Root>",
+                ],
+            ),
+            (
+                "wave6/duplicate_choice_branch_name.xsd",
+                "Person",
+                [
+                    "<Person><MinAge>18</MinAge><MaxAge>25</MaxAge></Person>",
+                    "<Person><MaxAge>25</MaxAge></Person>",
+                    "<Person/>",
+                ],
+            ),
+        ],
+    )
+    def test_particle_codec_regressions(tmp_path, backend, fixture, root_name, documents):
+        schema = pathlib.Path(__file__).resolve().parents[3] / "research" / "fixtures" / fixture
+        subprocess.run(
+            [
+>               str(_get_polyxml_bin()),
+                    ^^^^^^^^^^^^^^^^^^
+                "generate",
+                str(schema),
+                "--lang",
+                "python",
+                "--backend",
+                backend,
+                "--out",
+                str(tmp_path),
+            ],
+            check=True,
+            capture_output=True,
+        )
+
+tests/test_generated_models.py:126: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+_ test_particle_codec_regressions[wave6/duplicate_choice_branch_name.xsd-Person-documents4-dataclass] _
+
+tmp_path = PosixPath('/tmp/pytest-of-bailey/pytest-14/test_particle_codec_regression8')
+backend = 'dataclass', fixture = 'wave6/duplicate_choice_branch_name.xsd'
+root_name = 'Person'
+documents = ['<Person><MinAge>18</MinAge><MaxAge>25</MaxAge></Person>', '<Person><MaxAge>25</MaxAge></Person>', '<Person/>']
+
+    @pytest.mark.parametrize("backend", ["dataclass", "pydantic"])
+    @pytest.mark.parametrize(
+        ("fixture", "root_name", "documents"),
+        [
+            (
+                "nested_sequence_choice.xsd",
+                "Root",
+                [
+                    "<Root><First>A</First><Second>B</Second></Root>",
+                    "<Root><Alternative>C</Alternative></Root>",
+                ],
+            ),
+            (
+                "repeated_sequence.xsd",
+                "Root",
+                [
+                    "<Root><First>A1</First><Second>B1</Second><First>A2</First><Second>B2</Second></Root>",
+                    "<Root/>",
+                ],
+            ),
+            (
+                "substitution_group.xsd",
+                "Portfolio",
+                [
+                    "<Portfolio xmlns='urn:audit:substitution'><Bond>A1</Bond><Equity>B1</Equity><Bond>A2</Bond></Portfolio>"
+                ],
+            ),
+            (
+                "choice_branch_cardinality.xsd",
+                "Root",
+                [
+                    "<Root><Timing>A1</Timing><Timing>A2</Timing></Root>",
+                    "<Root><Drive>B</Drive></Root>",
+                ],
+            ),
+            (
+                "wave6/duplicate_choice_branch_name.xsd",
+                "Person",
+                [
+                    "<Person><MinAge>18</MinAge><MaxAge>25</MaxAge></Person>",
+                    "<Person><MaxAge>25</MaxAge></Person>",
+                    "<Person/>",
+                ],
+            ),
+        ],
+    )
+    def test_particle_codec_regressions(tmp_path, backend, fixture, root_name, documents):
+        schema = pathlib.Path(__file__).resolve().parents[3] / "research" / "fixtures" / fixture
+        subprocess.run(
+            [
+>               str(_get_polyxml_bin()),
+                    ^^^^^^^^^^^^^^^^^^
+                "generate",
+                str(schema),
+                "--lang",
+                "python",
+                "--backend",
+                backend,
+                "--out",
+                str(tmp_path),
+            ],
+            check=True,
+            capture_output=True,
+        )
+
+tests/test_generated_models.py:126: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+_ test_particle_codec_regressions[wave6/duplicate_choice_branch_name.xsd-Person-documents4-pydantic] _
+
+tmp_path = PosixPath('/tmp/pytest-of-bailey/pytest-14/test_particle_codec_regression9')
+backend = 'pydantic', fixture = 'wave6/duplicate_choice_branch_name.xsd'
+root_name = 'Person'
+documents = ['<Person><MinAge>18</MinAge><MaxAge>25</MaxAge></Person>', '<Person><MaxAge>25</MaxAge></Person>', '<Person/>']
+
+    @pytest.mark.parametrize("backend", ["dataclass", "pydantic"])
+    @pytest.mark.parametrize(
+        ("fixture", "root_name", "documents"),
+        [
+            (
+                "nested_sequence_choice.xsd",
+                "Root",
+                [
+                    "<Root><First>A</First><Second>B</Second></Root>",
+                    "<Root><Alternative>C</Alternative></Root>",
+                ],
+            ),
+            (
+                "repeated_sequence.xsd",
+                "Root",
+                [
+                    "<Root><First>A1</First><Second>B1</Second><First>A2</First><Second>B2</Second></Root>",
+                    "<Root/>",
+                ],
+            ),
+            (
+                "substitution_group.xsd",
+                "Portfolio",
+                [
+                    "<Portfolio xmlns='urn:audit:substitution'><Bond>A1</Bond><Equity>B1</Equity><Bond>A2</Bond></Portfolio>"
+                ],
+            ),
+            (
+                "choice_branch_cardinality.xsd",
+                "Root",
+                [
+                    "<Root><Timing>A1</Timing><Timing>A2</Timing></Root>",
+                    "<Root><Drive>B</Drive></Root>",
+                ],
+            ),
+            (
+                "wave6/duplicate_choice_branch_name.xsd",
+                "Person",
+                [
+                    "<Person><MinAge>18</MinAge><MaxAge>25</MaxAge></Person>",
+                    "<Person><MaxAge>25</MaxAge></Person>",
+                    "<Person/>",
+                ],
+            ),
+        ],
+    )
+    def test_particle_codec_regressions(tmp_path, backend, fixture, root_name, documents):
+        schema = pathlib.Path(__file__).resolve().parents[3] / "research" / "fixtures" / fixture
+        subprocess.run(
+            [
+>               str(_get_polyxml_bin()),
+                    ^^^^^^^^^^^^^^^^^^
+                "generate",
+                str(schema),
+                "--lang",
+                "python",
+                "--backend",
+                backend,
+                "--out",
+                str(tmp_path),
+            ],
+            check=True,
+            capture_output=True,
+        )
+
+tests/test_generated_models.py:126: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+__________________________ test_codecs_flag_disabled ___________________________
+
+    def test_codecs_flag_disabled():
+>       polyxml_bin = _get_polyxml_bin()
+                      ^^^^^^^^^^^^^^^^^^
+
+tests/test_generated_models.py:506: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+___________ test_generated_models_reject_general_entities[dataclass] ___________
+
+tmp_path = PosixPath('/tmp/pytest-of-bailey/pytest-14/test_generated_models_reject_g0')
+backend = 'dataclass'
+
+    @pytest.mark.parametrize("backend", ["dataclass", "pydantic"])
+    def test_generated_models_reject_general_entities(tmp_path, backend):
+        schema = pathlib.Path(__file__).resolve().parents[3] / "research/fixtures/wave7/xxe_text.xsd"
+        subprocess.run(
+            [
+>               str(_get_polyxml_bin()),
+                    ^^^^^^^^^^^^^^^^^^
+                "generate",
+                str(schema),
+                "--lang",
+                "python",
+                "--backend",
+                backend,
+                "--out",
+                str(tmp_path),
+            ],
+            check=True,
+            capture_output=True,
+        )
+
+tests/test_generated_models.py:541: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+___________ test_generated_models_reject_general_entities[pydantic] ____________
+
+tmp_path = PosixPath('/tmp/pytest-of-bailey/pytest-14/test_generated_models_reject_g1')
+backend = 'pydantic'
+
+    @pytest.mark.parametrize("backend", ["dataclass", "pydantic"])
+    def test_generated_models_reject_general_entities(tmp_path, backend):
+        schema = pathlib.Path(__file__).resolve().parents[3] / "research/fixtures/wave7/xxe_text.xsd"
+        subprocess.run(
+            [
+>               str(_get_polyxml_bin()),
+                    ^^^^^^^^^^^^^^^^^^
+                "generate",
+                str(schema),
+                "--lang",
+                "python",
+                "--backend",
+                backend,
+                "--out",
+                str(tmp_path),
+            ],
+            check=True,
+            capture_output=True,
+        )
+
+tests/test_generated_models.py:541: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+______________ test_element_defaults_preserve_absence[dataclass] _______________
+
+tmp_path = PosixPath('/tmp/pytest-of-bailey/pytest-14/test_element_defaults_preserve0')
+backend = 'dataclass'
+
+    @pytest.mark.parametrize("backend", ["dataclass", "pydantic"])
+    def test_element_defaults_preserve_absence(tmp_path, backend):
+        schema = pathlib.Path(__file__).resolve().parents[3] / "research/fixtures/element_defaults.xsd"
+        subprocess.run(
+            [
+>               str(_get_polyxml_bin()),
+                    ^^^^^^^^^^^^^^^^^^
+                "generate",
+                str(schema),
+                "--lang",
+                "python",
+                "--backend",
+                backend,
+                "--out",
+                str(tmp_path),
+            ],
+            check=True,
+            capture_output=True,
+        )
+
+tests/test_generated_models.py:575: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+_______________ test_element_defaults_preserve_absence[pydantic] _______________
+
+tmp_path = PosixPath('/tmp/pytest-of-bailey/pytest-14/test_element_defaults_preserve1')
+backend = 'pydantic'
+
+    @pytest.mark.parametrize("backend", ["dataclass", "pydantic"])
+    def test_element_defaults_preserve_absence(tmp_path, backend):
+        schema = pathlib.Path(__file__).resolve().parents[3] / "research/fixtures/element_defaults.xsd"
+        subprocess.run(
+            [
+>               str(_get_polyxml_bin()),
+                    ^^^^^^^^^^^^^^^^^^
+                "generate",
+                str(schema),
+                "--lang",
+                "python",
+                "--backend",
+                backend,
+                "--out",
+                str(tmp_path),
+            ],
+            check=True,
+            capture_output=True,
+        )
+
+tests/test_generated_models.py:575: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+____________ test_fixed_values_validate_input_and_output[dataclass] ____________
+
+tmp_path = PosixPath('/tmp/pytest-of-bailey/pytest-14/test_fixed_values_validate_inp0')
+backend = 'dataclass'
+
+    @pytest.mark.parametrize("backend", ["dataclass", "pydantic"])
+    def test_fixed_values_validate_input_and_output(tmp_path, backend):
+        schema = pathlib.Path(__file__).resolve().parents[3] / "research/fixtures/fixed_values.xsd"
+        subprocess.run(
+            [
+>               str(_get_polyxml_bin()),
+                    ^^^^^^^^^^^^^^^^^^
+                "generate",
+                str(schema),
+                "--lang",
+                "python",
+                "--backend",
+                backend,
+                "--out",
+                str(tmp_path),
+            ],
+            check=True,
+            capture_output=True,
+        )
+
+tests/test_generated_models.py:608: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+____________ test_fixed_values_validate_input_and_output[pydantic] _____________
+
+tmp_path = PosixPath('/tmp/pytest-of-bailey/pytest-14/test_fixed_values_validate_inp1')
+backend = 'pydantic'
+
+    @pytest.mark.parametrize("backend", ["dataclass", "pydantic"])
+    def test_fixed_values_validate_input_and_output(tmp_path, backend):
+        schema = pathlib.Path(__file__).resolve().parents[3] / "research/fixtures/fixed_values.xsd"
+        subprocess.run(
+            [
+>               str(_get_polyxml_bin()),
+                    ^^^^^^^^^^^^^^^^^^
+                "generate",
+                str(schema),
+                "--lang",
+                "python",
+                "--backend",
+                backend,
+                "--out",
+                str(tmp_path),
+            ],
+            check=True,
+            capture_output=True,
+        )
+
+tests/test_generated_models.py:608: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+__________ test_separate_choice_groups_enforce_constraints[dataclass] __________
+
+tmp_path = PosixPath('/tmp/pytest-of-bailey/pytest-14/test_separate_choice_groups_en0')
+backend = 'dataclass'
+
+    @pytest.mark.parametrize("backend", ["dataclass", "pydantic"])
+    def test_separate_choice_groups_enforce_constraints(tmp_path, backend):
+        schema = (
+            pathlib.Path(__file__).resolve().parents[3]
+            / "research/fixtures/wave6/two_choice_groups.xsd"
+        )
+        subprocess.run(
+            [
+>               str(_get_polyxml_bin()),
+                    ^^^^^^^^^^^^^^^^^^
+                "generate",
+                str(schema),
+                "--lang",
+                "python",
+                "--backend",
+                backend,
+                "--out",
+                str(tmp_path),
+            ],
+            check=True,
+            capture_output=True,
+        )
+
+tests/test_generated_models.py:647: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+__________ test_separate_choice_groups_enforce_constraints[pydantic] ___________
+
+tmp_path = PosixPath('/tmp/pytest-of-bailey/pytest-14/test_separate_choice_groups_en1')
+backend = 'pydantic'
+
+    @pytest.mark.parametrize("backend", ["dataclass", "pydantic"])
+    def test_separate_choice_groups_enforce_constraints(tmp_path, backend):
+        schema = (
+            pathlib.Path(__file__).resolve().parents[3]
+            / "research/fixtures/wave6/two_choice_groups.xsd"
+        )
+        subprocess.run(
+            [
+>               str(_get_polyxml_bin()),
+                    ^^^^^^^^^^^^^^^^^^
+                "generate",
+                str(schema),
+                "--lang",
+                "python",
+                "--backend",
+                backend,
+                "--out",
+                str(tmp_path),
+            ],
+            check=True,
+            capture_output=True,
+        )
+
+tests/test_generated_models.py:647: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+________________ test_repeated_sequence_constraints[dataclass] _________________
+
+tmp_path = PosixPath('/tmp/pytest-of-bailey/pytest-14/test_repeated_sequence_constra0')
+backend = 'dataclass'
+
+    @pytest.mark.parametrize("backend", ["dataclass", "pydantic"])
+    def test_repeated_sequence_constraints(tmp_path, backend):
+        schema = pathlib.Path(__file__).resolve().parents[3] / "research/fixtures/repeated_sequence.xsd"
+        subprocess.run(
+            [
+>               str(_get_polyxml_bin()),
+                    ^^^^^^^^^^^^^^^^^^
+                "generate",
+                str(schema),
+                "--lang",
+                "python",
+                "--backend",
+                backend,
+                "--out",
+                str(tmp_path),
+            ],
+            check=True,
+            capture_output=True,
+        )
+
+tests/test_generated_models.py:686: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+_________________ test_repeated_sequence_constraints[pydantic] _________________
+
+tmp_path = PosixPath('/tmp/pytest-of-bailey/pytest-14/test_repeated_sequence_constra1')
+backend = 'pydantic'
+
+    @pytest.mark.parametrize("backend", ["dataclass", "pydantic"])
+    def test_repeated_sequence_constraints(tmp_path, backend):
+        schema = pathlib.Path(__file__).resolve().parents[3] / "research/fixtures/repeated_sequence.xsd"
+        subprocess.run(
+            [
+>               str(_get_polyxml_bin()),
+                    ^^^^^^^^^^^^^^^^^^
+                "generate",
+                str(schema),
+                "--lang",
+                "python",
+                "--backend",
+                backend,
+                "--out",
+                str(tmp_path),
+            ],
+            check=True,
+            capture_output=True,
+        )
+
+tests/test_generated_models.py:686: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+_____________________ test_typed_lexical_lists[dataclass] ______________________
+
+tmp_path = PosixPath('/tmp/pytest-of-bailey/pytest-14/test_typed_lexical_lists_datac0')
+backend = 'dataclass'
+
+    @pytest.mark.parametrize("backend", ["dataclass", "pydantic"])
+    def test_typed_lexical_lists(tmp_path, backend):
+        schema = pathlib.Path(__file__).resolve().parents[3] / "research/fixtures/list_simple_types.xsd"
+        subprocess.run(
+            [
+>               str(_get_polyxml_bin()),
+                    ^^^^^^^^^^^^^^^^^^
+                "generate",
+                str(schema),
+                "--lang",
+                "python",
+                "--backend",
+                backend,
+                "--out",
+                str(tmp_path),
+            ],
+            check=True,
+            capture_output=True,
+        )
+
+tests/test_generated_models.py:723: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+______________________ test_typed_lexical_lists[pydantic] ______________________
+
+tmp_path = PosixPath('/tmp/pytest-of-bailey/pytest-14/test_typed_lexical_lists_pydan0')
+backend = 'pydantic'
+
+    @pytest.mark.parametrize("backend", ["dataclass", "pydantic"])
+    def test_typed_lexical_lists(tmp_path, backend):
+        schema = pathlib.Path(__file__).resolve().parents[3] / "research/fixtures/list_simple_types.xsd"
+        subprocess.run(
+            [
+>               str(_get_polyxml_bin()),
+                    ^^^^^^^^^^^^^^^^^^
+                "generate",
+                str(schema),
+                "--lang",
+                "python",
+                "--backend",
+                backend,
+                "--out",
+                str(tmp_path),
+            ],
+            check=True,
+            capture_output=True,
+        )
+
+tests/test_generated_models.py:723: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+_____________ test_named_lexical_list_item_constraints[dataclass] ______________
+
+tmp_path = PosixPath('/tmp/pytest-of-bailey/pytest-14/test_named_lexical_list_item_c0')
+backend = 'dataclass'
+
+    @pytest.mark.parametrize("backend", ["dataclass", "pydantic"])
+    def test_named_lexical_list_item_constraints(tmp_path, backend):
+        schema = (
+            pathlib.Path(__file__).resolve().parents[3] / "research/fixtures/restricted_list_items.xsd"
+        )
+        subprocess.run(
+            [
+>               str(_get_polyxml_bin()),
+                    ^^^^^^^^^^^^^^^^^^
+                "generate",
+                str(schema),
+                "--lang",
+                "python",
+                "--backend",
+                backend,
+                "--out",
+                str(tmp_path),
+            ],
+            check=True,
+            capture_output=True,
+        )
+
+tests/test_generated_models.py:758: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+______________ test_named_lexical_list_item_constraints[pydantic] ______________
+
+tmp_path = PosixPath('/tmp/pytest-of-bailey/pytest-14/test_named_lexical_list_item_c1')
+backend = 'pydantic'
+
+    @pytest.mark.parametrize("backend", ["dataclass", "pydantic"])
+    def test_named_lexical_list_item_constraints(tmp_path, backend):
+        schema = (
+            pathlib.Path(__file__).resolve().parents[3] / "research/fixtures/restricted_list_items.xsd"
+        )
+        subprocess.run(
+            [
+>               str(_get_polyxml_bin()),
+                    ^^^^^^^^^^^^^^^^^^
+                "generate",
+                str(schema),
+                "--lang",
+                "python",
+                "--backend",
+                backend,
+                "--out",
+                str(tmp_path),
+            ],
+            check=True,
+            capture_output=True,
+        )
+
+tests/test_generated_models.py:758: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+______________ test_repeated_choice_branch_boundaries[dataclass] _______________
+
+tmp_path = PosixPath('/tmp/pytest-of-bailey/pytest-14/test_repeated_choice_branch_bo0')
+backend = 'dataclass'
+
+    @pytest.mark.parametrize("backend", ["dataclass", "pydantic"])
+    def test_repeated_choice_branch_boundaries(tmp_path, backend):
+        schema = (
+            pathlib.Path(__file__).resolve().parents[3]
+            / "research/fixtures/choice_branch_cardinality.xsd"
+        )
+        subprocess.run(
+            [
+>               str(_get_polyxml_bin()),
+                    ^^^^^^^^^^^^^^^^^^
+                "generate",
+                str(schema),
+                "--lang",
+                "python",
+                "--backend",
+                backend,
+                "--out",
+                str(tmp_path),
+            ],
+            check=True,
+            capture_output=True,
+        )
+
+tests/test_generated_models.py:796: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+_______________ test_repeated_choice_branch_boundaries[pydantic] _______________
+
+tmp_path = PosixPath('/tmp/pytest-of-bailey/pytest-14/test_repeated_choice_branch_bo1')
+backend = 'pydantic'
+
+    @pytest.mark.parametrize("backend", ["dataclass", "pydantic"])
+    def test_repeated_choice_branch_boundaries(tmp_path, backend):
+        schema = (
+            pathlib.Path(__file__).resolve().parents[3]
+            / "research/fixtures/choice_branch_cardinality.xsd"
+        )
+        subprocess.run(
+            [
+>               str(_get_polyxml_bin()),
+                    ^^^^^^^^^^^^^^^^^^
+                "generate",
+                str(schema),
+                "--lang",
+                "python",
+                "--backend",
+                backend,
+                "--out",
+                str(tmp_path),
+            ],
+            check=True,
+            capture_output=True,
+        )
+
+tests/test_generated_models.py:796: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+________ test_duplicate_choice_names_validate_branch_shapes[dataclass] _________
+
+tmp_path = PosixPath('/tmp/pytest-of-bailey/pytest-14/test_duplicate_choice_names_va0')
+backend = 'dataclass'
+
+    @pytest.mark.parametrize("backend", ["dataclass", "pydantic"])
+    def test_duplicate_choice_names_validate_branch_shapes(tmp_path, backend):
+        schema = (
+            pathlib.Path(__file__).resolve().parents[3]
+            / "research/fixtures/wave6/duplicate_choice_branch_name.xsd"
+        )
+        subprocess.run(
+            [
+>               str(_get_polyxml_bin()),
+                    ^^^^^^^^^^^^^^^^^^
+                "generate",
+                str(schema),
+                "--lang",
+                "python",
+                "--backend",
+                backend,
+                "--out",
+                str(tmp_path),
+            ],
+            check=True,
+            capture_output=True,
+        )
+
+tests/test_generated_models.py:842: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+_________ test_duplicate_choice_names_validate_branch_shapes[pydantic] _________
+
+tmp_path = PosixPath('/tmp/pytest-of-bailey/pytest-14/test_duplicate_choice_names_va1')
+backend = 'pydantic'
+
+    @pytest.mark.parametrize("backend", ["dataclass", "pydantic"])
+    def test_duplicate_choice_names_validate_branch_shapes(tmp_path, backend):
+        schema = (
+            pathlib.Path(__file__).resolve().parents[3]
+            / "research/fixtures/wave6/duplicate_choice_branch_name.xsd"
+        )
+        subprocess.run(
+            [
+>               str(_get_polyxml_bin()),
+                    ^^^^^^^^^^^^^^^^^^
+                "generate",
+                str(schema),
+                "--lang",
+                "python",
+                "--backend",
+                backend,
+                "--out",
+                str(tmp_path),
+            ],
+            check=True,
+            capture_output=True,
+        )
+
+tests/test_generated_models.py:842: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+____________ test_abstract_substitution_head_is_rejected[dataclass] ____________
+
+tmp_path = PosixPath('/tmp/pytest-of-bailey/pytest-14/test_abstract_substitution_hea0')
+backend = 'dataclass'
+
+    @pytest.mark.parametrize("backend", ["dataclass", "pydantic"])
+    def test_abstract_substitution_head_is_rejected(tmp_path, backend):
+        schema = (
+            pathlib.Path(__file__).resolve().parents[3] / "research/fixtures/substitution_group.xsd"
+        )
+        subprocess.run(
+            [
+>               str(_get_polyxml_bin()),
+                    ^^^^^^^^^^^^^^^^^^
+                "generate",
+                str(schema),
+                "--lang",
+                "python",
+                "--backend",
+                backend,
+                "--out",
+                str(tmp_path),
+            ],
+            check=True,
+            capture_output=True,
+        )
+
+tests/test_generated_models.py:877: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+____________ test_abstract_substitution_head_is_rejected[pydantic] _____________
+
+tmp_path = PosixPath('/tmp/pytest-of-bailey/pytest-14/test_abstract_substitution_hea1')
+backend = 'pydantic'
+
+    @pytest.mark.parametrize("backend", ["dataclass", "pydantic"])
+    def test_abstract_substitution_head_is_rejected(tmp_path, backend):
+        schema = (
+            pathlib.Path(__file__).resolve().parents[3] / "research/fixtures/substitution_group.xsd"
+        )
+        subprocess.run(
+            [
+>               str(_get_polyxml_bin()),
+                    ^^^^^^^^^^^^^^^^^^
+                "generate",
+                str(schema),
+                "--lang",
+                "python",
+                "--backend",
+                backend,
+                "--out",
+                str(tmp_path),
+            ],
+            check=True,
+            capture_output=True,
+        )
+
+tests/test_generated_models.py:877: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+_________________ test_unbounded_integer_round_trip[dataclass] _________________
+
+tmp_path = PosixPath('/tmp/pytest-of-bailey/pytest-14/test_unbounded_integer_round_t0')
+backend = 'dataclass'
+
+    @pytest.mark.parametrize("backend", ["dataclass", "pydantic"])
+    def test_unbounded_integer_round_trip(tmp_path, backend):
+        schema = (
+            pathlib.Path(__file__).resolve().parents[3]
+            / "research/fixtures/wave5/unbounded_integer.xsd"
+        )
+        subprocess.run(
+            [
+>               str(_get_polyxml_bin()),
+                    ^^^^^^^^^^^^^^^^^^
+                "generate",
+                str(schema),
+                "--lang",
+                "python",
+                "--backend",
+                backend,
+                "--out",
+                str(tmp_path),
+            ],
+            check=True,
+            capture_output=True,
+        )
+
+tests/test_generated_models.py:915: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+_________________ test_unbounded_integer_round_trip[pydantic] __________________
+
+tmp_path = PosixPath('/tmp/pytest-of-bailey/pytest-14/test_unbounded_integer_round_t1')
+backend = 'pydantic'
+
+    @pytest.mark.parametrize("backend", ["dataclass", "pydantic"])
+    def test_unbounded_integer_round_trip(tmp_path, backend):
+        schema = (
+            pathlib.Path(__file__).resolve().parents[3]
+            / "research/fixtures/wave5/unbounded_integer.xsd"
+        )
+        subprocess.run(
+            [
+>               str(_get_polyxml_bin()),
+                    ^^^^^^^^^^^^^^^^^^
+                "generate",
+                str(schema),
+                "--lang",
+                "python",
+                "--backend",
+                backend,
+                "--out",
+                str(tmp_path),
+            ],
+            check=True,
+            capture_output=True,
+        )
+
+tests/test_generated_models.py:915: 
+_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
+
+    def _get_polyxml_bin() -> pathlib.Path:
+        repo_root = pathlib.Path(__file__).parent.parent.parent.parent
+        exe_name = "polyxml.exe" if sys.platform == "win32" else "polyxml"
+        candidates = [
+            repo_root / "target" / "debug" / exe_name,
+            repo_root / "target" / "release" / exe_name,
+        ]
+        for c in candidates:
+            if c.exists():
+                return c
+    
+        which_path = shutil.which(exe_name) or shutil.which("polyxml")
+        if which_path:
+            return pathlib.Path(which_path)
+    
+        # Attempt on-the-fly compilation via cargo if not found
+        subprocess.run(
+            ["cargo", "build", "-p", "polyxml-cli"],
+            cwd=repo_root,
+            check=True,
+            capture_output=True,
+        )
+        for c in candidates:
+            if c.exists():
+                return c
+    
+>       raise FileNotFoundError(f"polyxml CLI binary could not be found or built at {candidates}")
+E       FileNotFoundError: polyxml CLI binary could not be found or built at [PosixPath('/home/bailey/github/polyxml-default-literals/target/debug/polyxml'), PosixPath('/home/bailey/github/polyxml-default-literals/target/release/polyxml')]
+
+tests/test_generated_models.py:288: FileNotFoundError
+================================ tests coverage ================================
+_______________ coverage: platform linux, python 3.14.4-final-0 ________________
+
+Name    Stmts   Miss Branch BrPart  Cover   Missing
+---------------------------------------------------
+TOTAL     181      0     58      0   100%
+
+3 files skipped due to complete coverage.
+Required test coverage of 100% reached. Total coverage: 100.00%
+=========================== short test summary info ============================
+FAILED tests/test_generated_models.py::test_generated_abstract_root_preserves_derived_payload[dataclass] - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+FAILED tests/test_generated_models.py::test_generated_abstract_root_preserves_derived_payload[pydantic] - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+FAILED tests/test_generated_models.py::test_roots_with_the_same_local_name_in_distinct_namespaces - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+FAILED tests/test_generated_models.py::test_particle_codec_regressions[nested_sequence_choice.xsd-Root-documents0-dataclass] - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+FAILED tests/test_generated_models.py::test_particle_codec_regressions[nested_sequence_choice.xsd-Root-documents0-pydantic] - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+FAILED tests/test_generated_models.py::test_particle_codec_regressions[repeated_sequence.xsd-Root-documents1-dataclass] - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+FAILED tests/test_generated_models.py::test_particle_codec_regressions[repeated_sequence.xsd-Root-documents1-pydantic] - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+FAILED tests/test_generated_models.py::test_particle_codec_regressions[substitution_group.xsd-Portfolio-documents2-dataclass] - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+FAILED tests/test_generated_models.py::test_particle_codec_regressions[substitution_group.xsd-Portfolio-documents2-pydantic] - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+FAILED tests/test_generated_models.py::test_particle_codec_regressions[choice_branch_cardinality.xsd-Root-documents3-dataclass] - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+FAILED tests/test_generated_models.py::test_particle_codec_regressions[choice_branch_cardinality.xsd-Root-documents3-pydantic] - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+FAILED tests/test_generated_models.py::test_particle_codec_regressions[wave6/duplicate_choice_branch_name.xsd-Person-documents4-dataclass] - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+FAILED tests/test_generated_models.py::test_particle_codec_regressions[wave6/duplicate_choice_branch_name.xsd-Person-documents4-pydantic] - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+FAILED tests/test_generated_models.py::test_codecs_flag_disabled - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+FAILED tests/test_generated_models.py::test_generated_models_reject_general_entities[dataclass] - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+FAILED tests/test_generated_models.py::test_generated_models_reject_general_entities[pydantic] - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+FAILED tests/test_generated_models.py::test_element_defaults_preserve_absence[dataclass] - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+FAILED tests/test_generated_models.py::test_element_defaults_preserve_absence[pydantic] - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+FAILED tests/test_generated_models.py::test_fixed_values_validate_input_and_output[dataclass] - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+FAILED tests/test_generated_models.py::test_fixed_values_validate_input_and_output[pydantic] - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+FAILED tests/test_generated_models.py::test_separate_choice_groups_enforce_constraints[dataclass] - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+FAILED tests/test_generated_models.py::test_separate_choice_groups_enforce_constraints[pydantic] - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+FAILED tests/test_generated_models.py::test_repeated_sequence_constraints[dataclass] - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+FAILED tests/test_generated_models.py::test_repeated_sequence_constraints[pydantic] - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+FAILED tests/test_generated_models.py::test_typed_lexical_lists[dataclass] - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+FAILED tests/test_generated_models.py::test_typed_lexical_lists[pydantic] - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+FAILED tests/test_generated_models.py::test_named_lexical_list_item_constraints[dataclass] - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+FAILED tests/test_generated_models.py::test_named_lexical_list_item_constraints[pydantic] - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+FAILED tests/test_generated_models.py::test_repeated_choice_branch_boundaries[dataclass] - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+FAILED tests/test_generated_models.py::test_repeated_choice_branch_boundaries[pydantic] - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+FAILED tests/test_generated_models.py::test_duplicate_choice_names_validate_branch_shapes[dataclass] - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+FAILED tests/test_generated_models.py::test_duplicate_choice_names_validate_branch_shapes[pydantic] - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+FAILED tests/test_generated_models.py::test_abstract_substitution_head_is_rejected[dataclass] - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+FAILED tests/test_generated_models.py::test_abstract_substitution_head_is_rejected[pydantic] - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+FAILED tests/test_generated_models.py::test_unbounded_integer_round_trip[dataclass] - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+FAILED tests/test_generated_models.py::test_unbounded_integer_round_trip[pydantic] - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+ERROR tests/test_generated_models.py::test_declared_root_models[dataclass] - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+ERROR tests/test_generated_models.py::test_declared_root_models[pydantic] - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+ERROR tests/test_generated_models.py::test_generated_dataclass_deserialization_and_serialization - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+ERROR tests/test_generated_models.py::test_generated_pydantic_deserialization_and_serialization - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+ERROR tests/test_generated_models.py::test_generated_dataclass_codecs - FileNotFoundError: polyxml CLI binary could not be found or built at [Posix...
+36 failed, 71 passed, 5 errors in 21.41s
diff --git a/research/data/runtime-followups-2026-10-03/default-literals/quality-gate.txt b/research/data/runtime-followups-2026-10-03/default-literals/quality-gate.txt
new file mode 100644
index 0000000..a3ebf79
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/default-literals/quality-gate.txt
@@ -0,0 +1,769 @@
+memcap: <=7790 MiB (60% of 12984 MiB available) [systemd MemoryMax, swap off]
+==> [1/6] Running Rust format check (cargo fmt)...
+==> [2/6] Running Rust Clippy (cargo clippy -D warnings)...
+   Compiling pyo3-ffi v0.29.2
+   Compiling pyo3 v0.29.2
+    Checking polyxml-python v0.34.6 (/home/bailey/github/polyxml-default-literals/crates/polyxml-python)
+    Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.92s
+==> [3/6] Running Rust workspace tests (cargo test)...
+   Compiling pyo3-ffi v0.29.2
+   Compiling pyo3 v0.29.2
+   Compiling polyxml-python v0.34.6 (/home/bailey/github/polyxml-default-literals/crates/polyxml-python)
+    Finished `test` profile [unoptimized + debuginfo] target(s) in 2.65s
+     Running unittests src/lib.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/polyxml-675b717e531d04ed)
+
+running 16 tests
+test integer::tests::comparison_uses_sign_and_magnitude ... ok
+test ir::root_selection_tests::inherited_base_does_not_select_sibling_types ... ok
+test ir::root_selection_tests::rejects_missing_and_ambiguous_roots ... ok
+test ir::root_selection_tests::keeps_references_descendants_and_substitutions ... ok
+test ir::chunker::tests::test_topological_scc_chunking_dag_invariants ... ok
+test json::tests::test_json_deserialization_accepts_python_field_names ... ok
+test json::tests::test_json_roundtrip_primitives ... ok
+test tests::test_deserialization_does_not_confuse_xmlns_with_attributes ... ok
+test tests::test_nested_elements_and_lists ... ok
+test tests::test_namespaced_serialization ... ok
+test ir::root_selection_tests::field_reference_keeps_substitution_group_members ... ok
+test tests::test_roundtrip_serialization_deserialization ... ok
+test tests::test_streaming_xml_item_stream ... ok
+test pattern::tests::bounded_cache_evicts_and_retains_invalid_results ... ok
+test pattern::tests::cache_matches_uncached_regex_under_churn_and_concurrency ... ok
+test pattern::tests::cyclic_working_set_above_capacity_keeps_reusing_entries ... ok
+
+test result: ok. 16 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.15s
+
+     Running tests/test_adversarial_identifiers.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_adversarial_identifiers-34056256ccaa17cb)
+
+running 7 tests
+test test_rust_adversarial_compilation ... ok
+test test_python_adversarial_compilation ... ok
+test test_go_adversarial_compilation ... ok
+test test_cpp_adversarial_compilation ... ok
+test test_java_adversarial_compilation ... ok
+test test_typescript_adversarial_compilation ... ok
+test test_csharp_adversarial_compilation ... ok
+
+test result: ok. 7 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 3.25s
+
+     Running tests/test_any_attribute.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_any_attribute-d5795d9c5e0fdefd)
+
+running 1 test
+test test_any_attribute_schema_parser_and_runtime_roundtrip ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_any_element.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_any_element-1fb225d6616938e8)
+
+running 2 tests
+test test_any_element_go_codegen ... ok
+test test_any_element_schema_parser_and_runtime_roundtrip ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_conformance.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_conformance-0b37810d65fedfce)
+
+running 4 tests
+test test_soap_envelope_conformance ... ok
+test test_ubl_invoice_conformance ... ok
+test test_atom_feed_conformance ... ok
+test test_streaming_catalog_conformance ... ok
+
+test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.02s
+
+     Running tests/test_core.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_core-f4cc1079f88df2bc)
+
+running 9 tests
+test integer_mappings_keep_fixed_width_builtins ... ok
+test test_gregorian_partial_date_lexical_validation ... ok
+test test_error_handling_invalid_scalars ... ok
+test test_all_scalar_types ... ok
+test test_roundtrip_serialization_with_indentation ... ok
+test test_malformed_xml_syntax_error ... ok
+test test_xsi_nil_handling ... ok
+test unbounded_integers_round_trip_and_compare_exact_bounds ... ok
+test test_xsd_gregorian_fields_round_trip_and_reject_invalid_dates ... ok
+
+test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_cpp_codegen.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_cpp_codegen-a4cd5571504c64d5)
+
+running 14 tests
+test simple_aliases_follow_their_base_types ... ok
+test test_cpp_cmake_modules_file_set ... ok
+test test_cpp_cmake_and_meson_generation ... ok
+test test_cpp_mode_and_backend_from_str_loose ... ok
+test test_cpp_glaze_backend_meta_generation ... ok
+test test_cpp_sanitization ... ok
+test mixed_content_mutual_cycle_compiles ... ok
+test mixed_content_self_cycle_compiles ... ok
+Inheritance test passed.
+test test_cpp_inheritance_codegen ... ok
+Recursive tree unique_ptr passed.
+test test_cpp_recursive_cycle_unique_ptr ... ok
+All C++20 tests passed successfully.
+test test_cpp_struct_and_enum_codegen_compilation ... ok
+Choice pattern matching passed.
+test test_cpp_choice_variant_compilation ... ok
+test test_cpp_modules_compilation ... ok
+ISO 20022 pacs.008 C++20 test passed.
+test test_cpp_from_xsd_schema ... ok
+
+test result: ok. 14 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.86s
+
+     Running tests/test_csharp_codegen.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_csharp_codegen-cf32febf6e7f0777)
+
+running 20 tests
+test choice_variants_avoid_record_member_names ... ok
+test test_csharp_record_kind_from_str_loose ... ok
+test test_csharp_any_attribute_codegen ... ok
+test emits_unrestricted_simple_types_and_validates_empty_records ... ok
+test test_csharp_sanitization ... ok
+test test_csharp_date_or_datetime_lexical_union ... ok
+test test_csharp_sequence_nested_inside_choice_codegen ... ok
+test test_csharp_source_gen_context ... ok
+  Determining projects to restore...
+  Restored /tmp/.tmp51oDF2/PaymentsApp.csproj (in 222 ms).
+  PaymentsApp -> /tmp/.tmp51oDF2/bin/Debug/net8.0/PaymentsApp.dll
+
+Build succeeded.
+    0 Warning(s)
+    0 Error(s)
+
+Time Elapsed 00:00:01.31
+Choice pattern matching and XML serialization passed!
+test test_csharp_choice_polymorphic_hierarchy ... ok
+test unbounded_integer_xml_preserves_digits ... ok
+  Determining projects to restore...
+  Restored /tmp/.tmp6wrcLy/CrmApp.csproj (in 169 ms).
+  CrmApp -> /tmp/.tmp6wrcLy/bin/Debug/net8.0/CrmApp.dll
+
+Build succeeded.
+    0 Warning(s)
+    0 Error(s)
+
+Time Elapsed 00:00:01.04
+Customer C# tests passed cleanly!
+test test_csharp_records_and_enums_generation ... ok
+  Determining projects to restore...
+  Restored /tmp/.tmpKT1yLL/TreeApp.csproj (in 166 ms).
+  TreeApp -> /tmp/.tmpKT1yLL/bin/Debug/net8.0/TreeApp.dll
+
+Build succeeded.
+    0 Warning(s)
+    0 Error(s)
+
+Time Elapsed 00:00:01.02
+Recursive tree C# tests passed cleanly!
+test test_csharp_recursive_cycle ... ok
+test test_csharp_mutable_inheritance_roundtrip ... ok
+test test_csharp_mutable_wrappers_and_choices_without_validation ... ok
+test test_csharp_simple_content_class_validator_and_unsealed_records ... ok
+test fixed_values_are_enforced_on_read_and_write ... ok
+test element_defaults_preserve_absence_and_empty_presence ... ok
+test lexical_union_attributes_round_trip ... ok
+test nillable_enum_collection_round_trips ... ok
+test particle_wire_structure_round_trips ... ok
+
+test result: ok. 20 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 50.88s
+
+     Running tests/test_default_literal_codegen.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_default_literal_codegen-4c3562e7020c30db)
+
+running 1 test
+test generated_string_defaults_and_fixed_values_preserve_xml_characters ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 2.01s
+
+     Running tests/test_enum_literal_codegen.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_enum_literal_codegen-0c92c71c8d4587d6)
+
+running 1 test
+test enum_literals_compile_and_preserve_values_in_all_seven_languages ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 3.40s
+
+     Running tests/test_go_codegen.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_go_codegen-005c45ed4341be87)
+
+running 25 tests
+test referenced_element_uses_declared_type_after_includes ... ok
+test root_alias_names_are_unique_after_go_normalization ... ok
+test test_go_any_attribute_codegen ... ok
+test test_go_backend_from_str_loose ... ok
+go: creating new go.mod: module payments
+go: to add module requirements and sums:
+	go mod tidy
+test imported_ordered_types_do_not_add_unused_bytes_import ... ok
+test test_go_date_or_datetime_lexical_union ... ok
+test test_go_easyjson_backend ... ok
+test test_go_enum_only_schema_omits_unused_xml_import ... ok
+test separate_choices_enforce_each_group ... ok
+go: creating new go.mod: module tree
+go: to add module requirements and sums:
+	go mod tidy
+test roots_and_union_attributes_round_trip ... ok
+test test_go_sanitization ... ok
+test test_go_sonic_backend ... ok
+go: creating new go.mod: module crm
+go: to add module requirements and sums:
+	go mod tidy
+test abstract_substitution_heads_are_rejected ... ok
+=== RUN   TestChoiceMutualExclusivity
+    payments_test.go:44: Correctly rejected concurrent choice branches: choice ContactChoice mutual exclusivity violation: multiple branches populated (2)
+--- PASS: TestChoiceMutualExclusivity (0.00s)
+PASS
+ok  	payments	0.004s
+test test_go_choice_mutual_exclusivity ... ok
+test duplicate_choice_names_reject_invalid_branch_shapes ... ok
+test test_go_abstract_xsi_type_dispatch ... ok
+test nested_lexical_unions_compile_and_round_trip_in_go ... ok
+test repeated_choice_branch_rejects_mixed_and_empty_selections ... ok
+test repeated_sequence_groups_enforce_bounds_and_order ... ok
+test temporal_scalars_preserve_xsd_lexical_values ... ok
+test test_go_namespaced_element_ref_matching ... ok
+=== RUN   TestRecursiveTree
+--- PASS: TestRecursiveTree (0.00s)
+PASS
+ok  	tree	0.002s
+test test_go_recursive_cycle_pointers ... ok
+=== RUN   TestCustomerRoundtrip
+--- PASS: TestCustomerRoundtrip (0.00s)
+PASS
+ok  	crm	0.002s
+test test_go_struct_and_enum_generation ... ok
+test unbounded_integer_xml_preserves_digits ... ok
+test ordered_particles_and_choice_branches_round_trip ... ok
+
+test result: ok. 25 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 1.03s
+
+     Running tests/test_java_codegen.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_java_codegen-a6078e165fc64681)
+
+running 17 tests
+test test_java_jackson_backend_enum_annotations ... ok
+test test_java_identifier_sanitization ... ok
+test test_java_jackson_backend_from_str_loose ... ok
+test test_direct_codec_rejects_wildcards_and_name_collisions ... ok
+test test_java_bean_validation_annotations_are_opt_in ... ok
+test test_java_jackson_backend_struct_annotations ... ok
+test test_java_jackson_backend_simple_type_annotations ... ok
+test test_java_jackson_backend_union_annotations ... ok
+test test_java_plain_record_inlines_base_fields ... ok
+test jackson3_preserves_core_annotations_and_maps_record_text ... ok
+test test_java_sealed_interface_choice ... ok
+test test_java_module_container_class ... ok
+test test_java_records_and_enums_generation ... ok
+test test_java_plain_record_extension_javac_execute ... ok
+test test_java_record_builder_and_nested_codec_execute ... ok
+test test_java_mutable_builders_and_direct_codecs_execute ... ok
+test test_java_direct_nil_lists_choices_and_namespaces ... ok
+
+test result: ok. 17 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 2.43s
+
+     Running tests/test_json.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_json-74440efee0e911e7)
+
+running 4 tests
+test test_polyvalue_direct_json_methods ... ok
+test test_json_nested_objects_and_lists ... ok
+test test_json_primitives_and_alias_modes ... ok
+test test_json_scalar_coercion ... ok
+
+test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_lexical_lists.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_lexical_lists-0f6750d9c4bf9a3c)
+
+running 2 tests
+test named_list_items_enforce_facets_and_enumerations ... ok
+test typed_lexical_lists_round_trip_across_codecs ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 3.31s
+
+     Running tests/test_lexical_union_codegen.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_lexical_union_codegen-3c208893561d2732)
+
+running 2 tests
+test lexical_union_xml_selects_first_valid_member_and_round_trips ... ok
+test lexical_unions_are_typed_in_all_targets ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_mixed_content.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_mixed_content-1a697ad935ae2797)
+
+running 5 tests
+test mixed_items_field_avoids_existing_attribute_name ... ok
+test mixed_content_preserves_nested_child_order ... ok
+test mixed_content_preserves_text_and_child_order ... ok
+test parser_builds_ordered_mixed_content_union ... ok
+test generated_models_keep_typed_content_items_in_all_targets ... ok
+
+test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_pattern_codegen.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_pattern_codegen-5eee5f9fe2ed3d1a)
+
+running 9 tests
+test generated_typescript_pattern_validation_all_backends ... ok
+test pattern_restrictions_preserve_or_groups_and_inherited_and_steps ... ok
+test gregorian_primitives_emit_validated_types_across_targets ... ok
+test generated_python_pattern_validation ... ok
+test generated_go_pattern_validation_and_xml_roundtrip ... ok
+test generated_rust_pattern_validation_and_xml_roundtrip ... ok
+test generated_java_pattern_validation_and_direct_codecs ... ok
+test generated_cpp_pattern_validation ... ok
+test generated_csharp_pattern_validation ... ok
+
+test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 2.05s
+
+     Running tests/test_python_codegen.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_python_codegen-cc734e908fb39fb6)
+
+running 16 tests
+test test_identifier_sanitization ... ok
+test multiline_xsd_documentation_stays_inside_python_comments ... ok
+test test_python_abstract_meta_emission ... ok
+test test_python_any_attribute_codegen ... ok
+test test_python_codecs_generation ... ok
+test test_python_choice_union_codegen ... ok
+test test_python_dataclass_codegen ... ok
+test test_python_any_element_codegen ... ok
+test test_python_generated_tag_and_custom_header ... ok
+test test_python_pydantic_codegen_with_facets ... ok
+test test_python_recursive_type_codegen ... ok
+test test_python_aot_codegen ... ok
+test test_python_derived_meta_inheritance ... ok
+test test_python_simplecontent_default_factory ... ok
+test test_python_sequence_nested_inside_choice_codegen ... ok
+test quoted_docstrings_preserve_text_and_remain_valid_python ... ok
+
+test result: ok. 16 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.05s
+
+     Running tests/test_qualified_attributes.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_qualified_attributes-f8397a31cf1ecf15)
+
+running 5 tests
+test global_attribute_references_round_trip_by_namespace ... ok
+test imported_inline_global_attribute_enum_round_trips ... ok
+test derived_validators_preserve_base_constraints ... ok
+test inherited_attribute_and_distinct_element_keep_separate_property_names ... ok
+test lexical_dependencies_compile_and_round_trip_without_implicit_imports ... ok
+
+test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 8.28s
+
+     Running tests/test_runtime_fast_paths.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_runtime_fast_paths-7bf9091b7252b7db)
+
+running 6 tests
+test repeated_nested_records_validate_their_own_lexical_lists ... ok
+test repeated_lexical_lists_keep_whitespace_validation ... ok
+test lexical_list_formatting_preserves_escaping_empty_lists_and_long_numbers ... ok
+test indexed_scalar_state_preserves_enum_pattern_and_split_text ... ok
+test cached_patterns_keep_raw_restriction_and_trimmed_pattern_semantics ... ok
+test unified_scalar_state_keeps_mixed_branch_order_nil_and_nested_frames ... ok
+
+test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_rust_codecs.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_rust_codecs-9692e165bd5e14bf)
+
+running 4 tests
+test test_facet_validation_min_max_length ... ok
+test test_order_choice_roundtrip ... ok
+test test_empty_element_codec ... ok
+test test_recursive_boxing_roundtrip ... ok
+
+test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_rust_codegen.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_rust_codegen-8bce8b4b67c7eca3)
+
+running 26 tests
+test test_rust_attribute_codec_loop_syntax ... ok
+test multiline_docs_and_raw_field_names_are_valid_source ... ok
+test test_rust_choice_union_codegen ... ok
+test test_rust_digit_prefixed_module_sanitization ... ok
+test test_rust_codecs_codegen ... ok
+test test_rust_enum_and_methods ... ok
+test test_rust_extension_base_cycle_cut ... ok
+test test_rust_identifier_sanitization ... ok
+test test_rust_phf_dispatch_uniquifies_like_field_metas ... ok
+test test_rust_owned_codegen ... ok
+test test_rust_phf_dispatch_union_groups_branch_tags ... ok
+test test_rust_recursive_cycle_boxing ... ok
+test test_rust_extension_codecs_decode_and_encode_base_fields ... ok
+test test_rust_extension_inlines_base_fields ... ok
+test test_rust_rkyv_derives ... ok
+test test_rust_zero_copy_codegen ... ok
+test test_rust_topological_scc_chunking ... ok
+test test_rust_simple_type_cycle_resilience ... ok
+test test_rust_simple_content_extension_shadow_rule ... ok
+test test_rust_simple_content_text_codec ... ok
+test test_rust_read_element_text_accumulates_refs_and_cdata ... ok
+test test_rust_phf_dispatch_emission ... ok
+test duplicate_wire_names_keep_distinct_json_values ... ok
+test binary_lexical_values_compile_and_round_trip_in_owned_and_borrowed_modes ... ok
+test empty_modules_compile_without_unused_reexports ... ok
+test named_choice_wrappers_round_trip_without_unreachable_dispatch ... ok
+
+test result: ok. 26 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 2.07s
+
+     Running tests/test_schema_attribute_entities.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_schema_attribute_entities-ce76904e09cb1816)
+
+running 4 tests
+test malformed_attributes_and_undefined_entities_are_errors_even_in_skipped_content ... ok
+test literal_attribute_whitespace_is_normalized_but_character_references_survive ... ok
+test namespace_and_qname_attributes_are_normalized_consistently ... ok
+test attribute_entities_reach_enum_facets_and_defaults_in_value_space ... ok
+
+test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_schema_audit.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_schema_audit-24992dfb5b4a626c)
+
+running 13 tests
+test derived_simple_type_inherits_base_patterns ... ok
+test duplicate_enumeration_values_are_deduped ... ok
+test distinct_values_with_colliding_variant_names_stay_unique ... ok
+test quick_xml_serde_skips_unknown_elements ... ok
+test all_languages_disambiguate_flat_collision ... ok
+test generated_rust_has_no_deny_unknown_fields ... ok
+test named_group_reference_fields_are_parsed ... ok
+test nested_inline_complex_type_is_extracted_not_leaked ... ok
+test rust_flat_output_has_no_colliding_type_names ... ok
+test simple_content_extension_emits_value_field ... ok
+test chameleon_include_adopts_including_namespace_per_includer ... ok
+test restricted_simple_types_emit_named_aliases ... ok
+test diamond_includes_do_not_duplicate_upa_source_documents ... ok
+
+test result: ok. 13 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
+
+     Running tests/test_schema_ir.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_schema_ir-f793c1b9895343c7)
+
+running 20 tests
+test global_attribute_reference_uses_declared_type ... ok
+test consumed_particles_do_not_swallow_following_declarations ... ok
+test schema_errors_preserve_forward_imports_and_annotation_payloads ... ok
+test consumed_child_subtrees_do_not_swallow_following_types ... ok
+test test_language_context_adapter ... ok
+test inline_list_item_types_preserve_enum_and_union_declarations ... ok
+test test_list_fields_do_not_trigger_spurious_cycles ... ok
+test missing_included_schema_is_an_error ... ok
+test schema_for_schemas_declared_types_are_not_unknown_builtins ... ok
+test derived_complex_type_keeps_base_and_bounded_choice ... ok
+test test_tarjan_self_recursive_cycle_detection_and_boxing ... ok
+test test_tarjan_mutual_recursive_cycle_detection_and_boxing ... ok
+test test_parse_lexical_union_member_types_and_inline_members ... ok
+test test_substitution_groups ... ok
+test test_minijinja_template_engine_and_filters ... ok
+test test_parse_complex_type_and_facets ... ok
+test imported_inline_global_attribute_types_are_resolved ... ok
+test xml_prefix_is_available_without_explicit_declaration ... ok
+test test_parse_choice_as_union ... ok
+test test_sequence_nested_inside_choice_preserved_in_ir ... ok
+
+test result: ok. 20 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_security.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_security-c3afa670f1d6c619)
+
+running 6 tests
+test test_malformed_unclosed_cdata_rejection ... ok
+test test_numeric_character_references ... ok
+test test_cdata_section_handling ... ok
+test unsupported_general_entities_are_rejected ... ok
+test test_xml_entity_roundtrip_escaping ... ok
+test test_max_depth_recursion_limit ... ok
+
+test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_temporal_union.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_temporal_union-e25d1f9b83e2fdc4)
+
+running 2 tests
+test go_temporal_union_preserves_branches_and_lexicals ... ok
+test csharp_temporal_union_preserves_branches_and_lexicals ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 3.01s
+
+     Running tests/test_transcoder.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_transcoder-6854114408316a2e)
+
+running 6 tests
+test test_schemaless_pretty_transcoding ... ok
+test test_transcoder_errors ... ok
+test test_schemaless_xml_to_json_and_back ... ok
+test test_schemaless_preserves_refs_cdata_and_attr_entities ... ok
+test test_schema_from_ir_transcoding ... ok
+test test_schema_directed_transcoding ... ok
+
+test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_ts_codegen.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_ts_codegen-4e67290c9758f4d9)
+
+running 9 tests
+test test_ts_backend_from_str_loose ... ok
+test test_ts_identifier_sanitization ... ok
+test test_ts_recursive_cycle_zod_lazy ... ok
+test test_ts_discriminated_union_choice ... ok
+test test_ts_typebox_schema_generation ... ok
+test test_ts_interface_and_enum_codegen ... ok
+test test_ts_valibot_schema_generation ... ok
+test test_ts_zod_schema_generation ... ok
+test mixed_content_inheritance_compiles_with_widened_items ... ok
+
+test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.32s
+
+     Running tests/test_ubl_csharp.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_ubl_csharp-b04bc8d2d5f891c2)
+
+running 2 tests
+test unprefixed_xsd_builtin_simple_content_base_uses_default_namespace ... ok
+test multi_namespace_roots_and_inherited_simple_content_compile_and_round_trip ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 3.01s
+
+     Running tests/test_unbounded_choice.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_unbounded_choice-7672e62aa5ecca1a)
+
+running 1 test
+go: creating new go.mod: module testmod
+go: to add module requirements and sums:
+	go mod tidy
+=== RUN   TestUnboundedChoiceOrder
+--- PASS: TestUnboundedChoiceOrder (0.00s)
+PASS
+ok  	testmod	0.002s
+test test_unbounded_choice_ir_and_all_targets ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.15s
+
+     Running tests/test_upa.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_upa-a20019d257c7eac5)
+
+running 6 tests
+test local_form_and_in_scope_qnames_distinguish_namespaces ... ok
+test model_groups_derivation_and_substitution_members_are_checked ... ok
+test imported_groups_and_chameleon_wildcards_keep_source_namespaces ... ok
+test optional_siblings_and_choice_lookahead_violate_upa ... ok
+test all_groups_and_wildcard_namespaces_are_checked ... ok
+test occurrence_ranges_keep_particle_identity_and_count_boundaries ... ok
+
+test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_value_constraints.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_value_constraints-73eb81a96de588c1)
+
+running 2 tests
+test fixed_constraints_cover_input_and_output_in_value_space ... ok
+test repeated_particle_cardinality_belongs_to_the_group ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_xsi_type.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_xsi_type-2c07a0776bd0ec60)
+
+running 11 tests
+test abstract_type_without_derivations_errors ... ok
+test plain_type_attribute_is_not_mistaken_for_dispatch ... ok
+test abstract_type_requires_concrete_selector ... ok
+test iterparse_dispatches_each_streamed_item ... ok
+test from_ir_flattens_base_fields_and_registers_variants ... ok
+test nested_xsi_type_dispatch_and_round_trip ... ok
+test root_xsi_type_dispatch_including_empty_element ... ok
+test nil_abstract_complex_type_skips_concrete_dispatch ... ok
+test unknown_xsi_type_on_abstract_type_errors ... ok
+test xsi_type_resolves_namespace_inherited_from_parent ... ok
+test variant_serialization_requires_namespaces ... ok
+
+test result: ok. 11 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running unittests src/lib.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/polyxml-4ccc220bbd6a27a0)
+
+running 2 tests
+test tests::test_c_abi_namespaced_roundtrip ... ok
+test tests::test_c_abi_nested_list_batch_roundtrip ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running unittests src/lib.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/polyxml_cli-dabf613ae4318f1b)
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running unittests src/main.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/polyxml-cec02944de7101b9)
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_cli.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/test_cli-714ccf0c30d96734)
+
+running 47 tests
+test fish_completion_filters_values_when_available ... ok
+test manifest_generation_does_not_ignore_cli_overrides ... ok
+Loading manifest: /tmp/.tmpjIemUz/polyxml.toml
+Compiling schema: /tmp/.tmpjIemUz/model.xsd
+  Namespace: urn:app
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Emitting target [csharp] into /tmp/.tmpjIemUz/cs
+Emitting target [ts] into /tmp/.tmpjIemUz/ts
+Emitting target [go] into /tmp/.tmpjIemUz/go
+Emitting target [rust] into /tmp/.tmpjIemUz/rs
+Build finished successfully.
+Parsing schema: /tmp/.tmpWpQzZc/customer.xsd
+test test_cli_build_polyxml_manifest_with_new_features ... ok
+  Namespace: urn:crm
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+test test_cli_csharp_source_gen_and_record_struct ... ok
+test test_cli_generate_custom_header_and_generated_tags ... ok
+test test_cli_cpp_modules_and_glaze ... ok
+test test_cli_generate_dry_run ... ok
+test jackson3_cli_and_manifest_emit_equivalent_models ... ok
+test test_cli_generate_help ... ok
+test test_cli_generate_multi_lang ... ok
+test python_features_respect_manifest_false_values_and_backend ... ok
+test imported_substitution_helpers_do_not_require_spurious_module_owners ... ok
+Parsing schema: /tmp/.tmpMChXrp/service.xsd
+test test_cli_help ... ok
+  Namespace: urn:service
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+test test_cli_generate_python_backends ... ok
+test retained_imported_ordered_helpers_belong_to_the_unique_namespace_module ... ok
+test test_cli_generate_rust_zero_copy_and_owned ... ok
+Loading manifest: /tmp/.tmpkcpVMJ/polyxml.toml
+Compiling schema: /tmp/.tmpkcpVMJ/schema.xsd
+Parsing schema: /tmp/.tmpMChXrp/service.xsd
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Emitting target [rust] into /tmp/.tmpkcpVMJ/rs
+  Namespace: urn:service
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+Emitting target [go] into /tmp/.tmpkcpVMJ/go
+Emitting target [csharp] into /tmp/.tmpkcpVMJ/cs
+Build finished successfully.
+test test_cli_go_easyjson_and_sonic_backend ... ok
+test test_cli_python_aot_generation ... ok
+test test_cli_manifest_custom_header_workspace_and_target_override ... ok
+test completion_candidates_follow_target_validation ... ok
+test test_cli_python_aot_rejects_dataclass_style_and_slots ... ok
+go: creating new go.mod: module crm
+Parsing schema: /tmp/.tmp4LMj9p/event.xsd
+go: to add module requirements and sums:
+	go mod tidy
+  Namespace: urn:events
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+test test_cli_multiple_root_element_selection ... ok
+test test_cli_rust_rkyv_feature ... ok
+Parsing schema: /tmp/.tmpEAXA5F/event.xsd
+  Namespace: urn:events
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+test test_cli_rust_phf_feature ... ok
+test invalid_schema_grammar_and_types_fail_before_generation ... ok
+test test_cli_validate_valid_and_invalid ... ok
+test test_cli_transcode_bidirectional ... ok
+test bash_completion_filters_values_in_the_shell ... ok
+Parsing schema: /tmp/.tmp96Kaev/item.xsd
+  Namespace: urn:store
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+test test_polyxml_toml_manifest_build ... ok
+Parsing schema: /tmp/.tmp96Kaev/item.xsd
+  Namespace: urn:store
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+test test_cli_typescript_valibot_and_typebox_backend ... ok
+test unified_help_shows_generation_options ... ok
+test test_cli_root_element_selection ... ok
+test test_root_selection_keeps_imported_module_types ... ok
+test test_java_csharp_model_style_options_and_manifest ... ok
+test unified_manifest_forms_generate_identical_output_and_validate_early ... ok
+test zsh_completion_filters_values_when_available ... ok
+test unsupported_xsd_alternatives_fail_explicitly ... ok
+test validate_and_generate_reject_upa_violations ... ok
+test unified_options_fail_before_schema_io_including_dry_run ... ok
+test unified_supported_backends_and_styles_validate ... ok
+=== RUN   TestAccountE2E
+--- PASS: TestAccountE2E (0.00s)
+PASS
+ok  	crm	0.004s
+test test_cli_go_generation ... ok
+test test_cli_rust_split_units_and_chunking ... ok
+E2E C++20 driver passed!
+test test_cli_cpp_generation ... ok
+test test_cli_java_generation ... ok
+test test_cli_shared_modules_deduplication ... ok
+  Determining projects to restore...
+  Restored /tmp/.tmpDBAA8l/cli_csharp_app/CrmCliApp.csproj (in 195 ms).
+test test_cli_typescript_generation ... ok
+  CrmCliApp -> /tmp/.tmpDBAA8l/cli_csharp_app/bin/Debug/net8.0/CrmCliApp.dll
+
+Build succeeded.
+    0 Warning(s)
+    0 Error(s)
+
+Time Elapsed 00:00:01.30
+E2E C# CLI test passed successfully!
+test test_cli_csharp_generation ... ok
+
+test result: ok. 47 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 3.17s
+
+     Running unittests src/lib.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/polyxml_js-878a75d7b7901cc9)
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running unittests src/lib.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/_polyxml-a668b0910babaf29)
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running unittests src/lib.rs (/home/bailey/github/PolyXML/target/followup-default-verification/debug/deps/polyxml_wasm-d510c7f48918b595)
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+   Doc-tests polyxml
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+   Doc-tests polyxml_cli
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+   Doc-tests polyxml_wasm
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+==> [4/6] Compiling Python PyO3 extension (maturin develop)...
+🍹 Building a mixed python/rust project
+🐍 Found CPython 3.14 at /home/bailey/github/polyxml-default-literals/.venv/bin/python
+🔗 Found pyo3 bindings with abi3-py3.12 support
+📡 Using build options features from pyproject.toml
+Using Python 3.14.4 environment at: /home/bailey/github/polyxml-default-literals/.venv
+Checked 6 packages in 0.55ms
+   Compiling pyo3-ffi v0.29.2
+   Compiling pyo3 v0.29.2
+   Compiling polyxml-python v0.34.6 (/home/bailey/github/polyxml-default-literals/crates/polyxml-python)
+    Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.54s
+📦 Built wheel for abi3 Python ≥ 3.12 to /tmp/.tmpJVA4UN/polyxml-0.34.6-cp312-abi3-linux_x86_64.whl
+✏️ Setting installed package as editable
+🛠 Installed polyxml-0.34.6
+==> [5/6] Running Python Ruff checks...
+All checks passed!
+10 files already formatted
+==> [6/6] Running Python tests with 100% statement & branch coverage...
+........................................................................ [ 62%]
+...........................................                              [100%]
+================================ tests coverage ================================
+_______________ coverage: platform linux, python 3.14.4-final-0 ________________
+
+Name    Stmts   Miss Branch BrPart  Cover   Missing
+---------------------------------------------------
+TOTAL     181      0     58      0   100%
+
+3 files skipped due to complete coverage.
+Required test coverage of 100% reached. Total coverage: 100.00%
+115 passed in 0.54s
+✨ All PolyXML dual-language quality gates passed!
diff --git a/research/data/runtime-followups-2026-10-03/default-literals/seven-backend-cli-smoke.txt b/research/data/runtime-followups-2026-10-03/default-literals/seven-backend-cli-smoke.txt
new file mode 100644
index 0000000..437be78
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/default-literals/seven-backend-cli-smoke.txt
@@ -0,0 +1,21 @@
+memcap: <=7775 MiB (60% of 12959 MiB available) [systemd MemoryMax, swap off]
+==> Building polyxml CLI binary...
+==> Testing code generation across all 7 target ecosystems...
+  • Rust (--feature zero-copy,rkyv,phf)... OK
+  • Python (dataclasses)... OK
+  • Python (pydantic-v2)... OK
+  • C++20 (headers + glaze)... OK
+  • C++20 (modules)... OK
+  • Java 22+ (standard records)... OK
+  • Java 22+ (jackson)... OK
+  • Java (POJO + builder + direct codec)... OK
+  • TypeScript (zod)... OK
+  • TypeScript (valibot)... OK
+  • TypeScript (typebox)... OK
+  • Go (standard)... OK
+  • Go (sonic)... OK
+  • Go (easyjson)... OK
+  • C# (record class)... OK
+  • C# (record struct + source-gen)... OK
+  • C# (mutable class + source-gen)... OK
+✨ Multi-target smoke verification passed completely across all 7 ecosystems!
diff --git a/research/data/runtime-followups-2026-10-03/entities/baseline/AttrDecl.txt b/research/data/runtime-followups-2026-10-03/entities/baseline/AttrDecl.txt
new file mode 100644
index 0000000..27c1c65
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/baseline/AttrDecl.txt
@@ -0,0 +1,23 @@
+memcap: <=7741 MiB (60% of 12902 MiB available) [systemd MemoryMax, swap off]
+╭─────────────────────────────────────────────────────────────╮
+│ PolyXML W3C XML Schema Conformance Suite                    │
+│ Compiler Binary: /tmp/polyxml-followup-baseline-bin/polyxml │
+│ W3C Submodule: /home/bailey/github/polyxml-w3c-tests/w3c    │
+│ Selected Suite: AttrDecl                                    │
+╰─────────────────────────────────────────────────────────────╯
+Executing 50 test group(s)...
+
+  Testing AttrDecl/ad_name00108m5... ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 100% 0:00:00
+
+       W3C XML Schema Conformance Summary        
+┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━┳━━━━━━━━┓
+┃ Category                     ┃ Count ┃   Rate ┃
+┡━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━╇━━━━━━━━┩
+│ Total Test Groups            │    50 │ 100.0% │
+│ Schema Compilations Passed   │    50 │ 100.0% │
+│ Schema Compilations Failed   │     0 │   0.0% │
+│ Valid Instances Evaluated    │    50 │      - │
+│ Roundtrip Validations Passed │    50 │ 100.0% │
+└──────────────────────────────┴───────┴────────┘
+
+All executed tests passed with 100% compliance!
diff --git a/research/data/runtime-followups-2026-10-03/entities/baseline/CType.txt b/research/data/runtime-followups-2026-10-03/entities/baseline/CType.txt
new file mode 100644
index 0000000..f06846b
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/baseline/CType.txt
@@ -0,0 +1,53 @@
+memcap: <=7742 MiB (60% of 12904 MiB available) [systemd MemoryMax, swap off]
+╭─────────────────────────────────────────────────────────────╮
+│ PolyXML W3C XML Schema Conformance Suite                    │
+│ Compiler Binary: /tmp/polyxml-followup-baseline-bin/polyxml │
+│ W3C Submodule: /home/bailey/github/polyxml-w3c-tests/w3c    │
+│ Selected Suite: CType                                       │
+╰─────────────────────────────────────────────────────────────╯
+Executing 31 test group(s)...
+
+  Testing CType/targetns00101m... ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 100% 0:00:00
+
+       W3C XML Schema Conformance Summary        
+┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━┳━━━━━━━━┓
+┃ Category                     ┃ Count ┃   Rate ┃
+┡━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━╇━━━━━━━━┩
+│ Total Test Groups            │    31 │ 100.0% │
+│ Schema Compilations Passed   │    31 │ 100.0% │
+│ Schema Compilations Failed   │     0 │   0.0% │
+│ Valid Instances Evaluated    │    28 │      - │
+│ Roundtrip Validations Passed │    23 │  82.1% │
+└──────────────────────────────┴───────┴────────┘
+
+Failures & Exceptions (5 groups):
+┏━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━┓
+┃                    ┃               ┃     Instances      ┃ Error / First      ┃
+┃ Suite/Group        ┃ Schema Status ┃    (Pass/Total)    ┃ Failure            ┃
+┡━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━┩
+│ CType/basetd00101… │ PASS          │        0/1         │ Positive: FAIL -   │
+│                    │               │                    │ Root.__init__()    │
+│                    │               │                    │ missing 1 required │
+│                    │               │                    │ keyword-only       │
+│                    │               │                    │ argument: 'valu    │
+│ CType/basetd00101… │ PASS          │        0/1         │ Positive: FAIL -   │
+│                    │               │                    │ Root.__init__()    │
+│                    │               │                    │ missing 1 required │
+│                    │               │                    │ keyword-only       │
+│                    │               │                    │ argument: 'valu    │
+│ CType/derivationm… │ PASS          │        0/1         │ Positive: FAIL -   │
+│                    │               │                    │ B.__init__()       │
+│                    │               │                    │ missing 1 required │
+│                    │               │                    │ keyword-only       │
+│                    │               │                    │ argument: 'value'  │
+│ CType/psubstituti… │ PASS          │        1/2         │ pSubstitutions001… │
+│                    │               │                    │ FAIL - Schema      │
+│                    │               │                    │ error: Unexpected  │
+│                    │               │                    │ root element       │
+│                    │               │                    │ {pSubstitu         │
+│ CType/psubstituti… │ PASS          │        1/2         │ pSubstitutions001… │
+│                    │               │                    │ FAIL - Schema      │
+│                    │               │                    │ error: Unexpected  │
+│                    │               │                    │ root element       │
+│                    │               │                    │ {pSubstitu         │
+└────────────────────┴───────────────┴────────────────────┴────────────────────┘
diff --git a/research/data/runtime-followups-2026-10-03/entities/baseline/NIST.txt b/research/data/runtime-followups-2026-10-03/entities/baseline/NIST.txt
new file mode 100644
index 0000000..fc5acd7
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/baseline/NIST.txt
@@ -0,0 +1,32 @@
+memcap: <=7745 MiB (60% of 12909 MiB available) [systemd MemoryMax, swap off]
+╭─────────────────────────────────────────────────────────────╮
+│ PolyXML W3C XML Schema Conformance Suite                    │
+│ Compiler Binary: /tmp/polyxml-followup-baseline-bin/polyxml │
+│ W3C Submodule: /home/bailey/github/polyxml-w3c-tests/w3c    │
+│ Selected Suite: NISTXMLSchemaDatatypes                      │
+╰─────────────────────────────────────────────────────────────╯
+Executing 100 test group(s)...
+
+  Testing NIST2004-01-14/atomic-nonPositiveInteger-totalDigits... ━━━━ 100% 0:0…
+
+       W3C XML Schema Conformance Summary        
+┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━┳━━━━━━━━┓
+┃ Category                     ┃ Count ┃   Rate ┃
+┡━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━╇━━━━━━━━┩
+│ Total Test Groups            │   100 │ 100.0% │
+│ Schema Compilations Passed   │   100 │ 100.0% │
+│ Schema Compilations Failed   │     0 │   0.0% │
+│ Valid Instances Evaluated    │   452 │      - │
+│ Roundtrip Validations Passed │   447 │  98.9% │
+└──────────────────────────────┴───────┴────────┘
+
+Failures & Exceptions (1 groups):
+┏━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━┓
+┃                    ┃               ┃     Instances      ┃ Error / First      ┃
+┃ Suite/Group        ┃ Schema Status ┃    (Pass/Total)    ┃ Failure            ┃
+┡━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━┩
+│ NIST2004-01-14/at… │ PASS          │        0/5         │ NISTXML-SV-IV-ato… │
+│                    │               │                    │ FAIL - Scalar      │
+│                    │               │                    │ parse error for    │
+│                    │               │                    │ field 'v           │
+└────────────────────┴───────────────┴────────────────────┴────────────────────┘
diff --git a/research/data/runtime-followups-2026-10-03/entities/baseline/binding.txt b/research/data/runtime-followups-2026-10-03/entities/baseline/binding.txt
new file mode 100644
index 0000000..8dd49aa
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/baseline/binding.txt
@@ -0,0 +1,30 @@
+memcap: <=7778 MiB (60% of 12964 MiB available) [systemd MemoryMax, swap off]
+🍹 Building a mixed python/rust project
+🐍 Found CPython 3.14 at /home/bailey/github/polyxml-w3c-tests/.venv/bin/python
+🔗 Found pyo3 bindings with abi3-py3.12 support
+📡 Using build options features from pyproject.toml
+Checked 6 packages in 0.51ms
+   Compiling target-lexicon v0.13.5
+   Compiling syn v3.0.5
+   Compiling serde_core v1.0.229
+   Compiling pyo3-build-config v0.29.2
+   Compiling pyo3-ffi v0.29.2
+   Compiling serde_derive v1.0.229
+   Compiling libc v0.2.189
+   Compiling serde v1.0.229
+   Compiling syn v2.0.119
+   Compiling pyo3-macros-backend v0.29.2
+   Compiling pyo3 v0.29.2
+   Compiling thiserror-impl v2.0.21
+   Compiling serde_json v1.0.151
+   Compiling minijinja v2.24.0
+   Compiling thiserror v2.0.21
+   Compiling pyo3-macros v0.29.2
+   Compiling quick-xml v0.42.0
+   Compiling once_cell v1.21.4
+   Compiling polyxml v0.34.6 (/home/bailey/github/polyxml-perf-selected/crates/polyxml-core)
+   Compiling polyxml-python v0.34.6 (/home/bailey/github/polyxml-perf-selected/crates/polyxml-python)
+    Finished `dev` profile [unoptimized + debuginfo] target(s) in 25.77s
+📦 Built wheel for abi3 Python ≥ 3.12 to /tmp/.tmpggf2rx/polyxml-0.34.6-cp312-abi3-linux_x86_64.whl
+✏️ Setting installed package as editable
+🛠 Installed polyxml-0.34.6
diff --git a/research/data/runtime-followups-2026-10-03/entities/baseline/cli-build.txt b/research/data/runtime-followups-2026-10-03/entities/baseline/cli-build.txt
new file mode 100644
index 0000000..6212b3e
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/baseline/cli-build.txt
@@ -0,0 +1,56 @@
+memcap: <=7798 MiB (60% of 12997 MiB available) [systemd MemoryMax, swap off]
+   Compiling proc-macro2 v1.0.107
+   Compiling quote v1.0.47
+   Compiling unicode-ident v1.0.24
+   Compiling serde_core v1.0.229
+   Compiling syn v3.0.5
+   Compiling lexical-util v1.0.7
+   Compiling memchr v2.8.3
+   Compiling serde v1.0.229
+   Compiling serde_derive v1.0.229
+   Compiling zmij v1.0.23
+   Compiling siphasher v1.0.3
+   Compiling utf8parse v0.2.2
+   Compiling anstyle-parse v1.0.0
+   Compiling phf_shared v0.14.0
+   Compiling aho-corasick v1.1.5
+   Compiling lexical-write-integer v1.0.6
+   Compiling lexical-parse-integer v1.0.6
+   Compiling serde_json v1.0.151
+   Compiling fastrand v2.5.0
+   Compiling heck v0.5.0
+   Compiling is_terminal_polyfill v1.70.2
+   Compiling colorchoice v1.0.5
+   Compiling anstyle-query v1.1.5
+   Compiling anstyle v1.0.14
+   Compiling regex-syntax v0.8.11
+   Compiling thiserror v2.0.21
+   Compiling regex-automata v0.4.18
+   Compiling anstream v1.0.0
+   Compiling phf_generator v0.14.0
+   Compiling lexical-parse-float v1.0.6
+   Compiling lexical-write-float v1.0.6
+   Compiling thiserror-impl v2.0.21
+   Compiling memo-map v0.3.4
+   Compiling itoa v1.0.18
+   Compiling strsim v0.11.1
+   Compiling clap_lex v1.1.0
+   Compiling winnow v1.0.4
+   Compiling toml_parser v1.1.3+spec-1.1.0
+   Compiling clap_builder v4.6.7
+   Compiling minijinja v2.24.0
+   Compiling lexical-core v1.0.6
+   Compiling phf_codegen v0.14.0
+   Compiling regex v1.13.1
+   Compiling clap_derive v4.6.7
+   Compiling quick-xml v0.42.0
+   Compiling toml_datetime v1.1.1+spec-1.1.0
+   Compiling serde_spanned v1.1.1
+   Compiling smallvec v1.16.2
+   Compiling toml_writer v1.1.2+spec-1.1.0
+   Compiling toml v1.1.6+spec-1.1.0
+   Compiling polyxml v0.34.6 (/home/bailey/github/polyxml-perf-selected/crates/polyxml-core)
+   Compiling clap v4.6.7
+   Compiling glob v0.3.4
+   Compiling polyxml-cli v0.34.6 (/home/bailey/github/polyxml-perf-selected/crates/polyxml-cli)
+    Finished `dev` profile [unoptimized + debuginfo] target(s) in 32.13s
diff --git a/research/data/runtime-followups-2026-10-03/entities/baseline/cli-proof/enum_literal_escaping.rs b/research/data/runtime-followups-2026-10-03/entities/baseline/cli-proof/enum_literal_escaping.rs
new file mode 100644
index 0000000..3bd543d
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/baseline/cli-proof/enum_literal_escaping.rs
@@ -0,0 +1,125 @@
+// @generated by PolyXML Compiler (https://github.com/polyxml/PolyXML)
+#![allow(dead_code, unused_imports, unused_mut, unused_variables, unused_assignments, non_camel_case_types, non_snake_case)]
+
+use std::borrow::Cow;
+use serde::{Deserialize, Serialize};
+use std::str::FromStr;
+use quick_xml::events::{BytesEnd, BytesStart, BytesText, Event};
+use quick_xml::{Reader, Writer};
+use polyxml::{PolyXmlError, Result};
+
+#[allow(dead_code)]
+pub(crate) fn skip_xml_element(reader: &mut Reader<&[u8]>) -> Result<()> {
+    let mut depth = 1;
+    loop {
+        match reader.read_event()? {
+            Event::Start(_) => depth += 1,
+            Event::End(_) => {
+                depth -= 1;
+                if depth == 0 {
+                    break;
+                }
+            }
+            Event::Eof => break,
+            _ => {}
+        }
+    }
+    Ok(())
+}
+
+#[allow(dead_code)]
+pub(crate) fn read_element_text<'a>(reader: &mut Reader<&'a [u8]>, tag_name: &str) -> Result<Cow<'a, str>> {
+    let mut text = Cow::Borrowed("");
+    loop {
+        match reader.read_event()? {
+            Event::Text(t) => {
+                let raw = match t.into_inner() {
+                    Cow::Borrowed(b) => match quick_xml::escape::unescape(b)? {
+                        Cow::Borrowed(s) => Cow::Borrowed(s),
+                        Cow::Owned(s) => Cow::Owned(s),
+                    },
+                    Cow::Owned(s) => Cow::Owned(quick_xml::escape::unescape(&s)?.into_owned()),
+                };
+                if text.is_empty() {
+                    text = raw;
+                } else {
+                    text.to_mut().push_str(&raw);
+                }
+            }
+            Event::CData(c) => {
+                text.to_mut().push_str(c.as_ref());
+            }
+            Event::GeneralRef(r) => {
+                if r.is_char_ref() {
+                    if let Some(ch) = r.resolve_char_ref()? {
+                        text.to_mut().push(ch);
+                    }
+                } else if let Some(val) = quick_xml::escape::resolve_xml_entity(r.as_ref()) {
+                    text.to_mut().push_str(val);
+                } else {
+                    text.to_mut().push_str(r.as_ref());
+                }
+            }
+            Event::End(e) if e.local_name().as_ref() == tag_name => break,
+            Event::Eof => break,
+            _ => {}
+        }
+    }
+    Ok(text)
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Default, Serialize, Deserialize)]
+pub enum Status {
+    #[serde(rename = "R&amp;D")]
+    #[default]
+    RAmpD,
+    #[serde(rename = "&quot;quoted&quot; &apos;value&apos; &lt;tag&gt;")]
+    QuotQuotedQuotAposValueAposLtTagGt,
+    #[serde(rename = "caf&#xE9; &#128512;")]
+    CafHashxE9Hash128512,
+    #[serde(rename = "literal &amp;amp;")]
+    LiteralAmpAmp,
+    #[serde(rename = "slash\path\u000a")]
+    SlashPathU000a,
+    #[serde(rename = "tab&#9;line&#10;carriage&#13;tail")]
+    TabHash9LineHash10CarriageHash13Tail,
+    #[serde(rename = "&#x85;next&#x2028;line")]
+    Hashx85NextHashx2028Line,
+}
+
+impl Status {
+    pub fn as_str(&self) -> &'static str {
+        match self {
+            Self::RAmpD => "R&amp;D",
+            Self::QuotQuotedQuotAposValueAposLtTagGt => "&quot;quoted&quot; &apos;value&apos; &lt;tag&gt;",
+            Self::CafHashxE9Hash128512 => "caf&#xE9; &#128512;",
+            Self::LiteralAmpAmp => "literal &amp;amp;",
+            Self::SlashPathU000a => "slash\path\u000a",
+            Self::TabHash9LineHash10CarriageHash13Tail => "tab&#9;line&#10;carriage&#13;tail",
+            Self::Hashx85NextHashx2028Line => "&#x85;next&#x2028;line",
+        }
+    }
+}
+
+impl std::str::FromStr for Status {
+    type Err = String;
+
+    fn from_str(s: &str) -> std::result::Result<Self, Self::Err> {
+        match s {
+            "R&amp;D" => Ok(Self::RAmpD),
+            "&quot;quoted&quot; &apos;value&apos; &lt;tag&gt;" => Ok(Self::QuotQuotedQuotAposValueAposLtTagGt),
+            "caf&#xE9; &#128512;" => Ok(Self::CafHashxE9Hash128512),
+            "literal &amp;amp;" => Ok(Self::LiteralAmpAmp),
+            "slash\path\u000a" => Ok(Self::SlashPathU000a),
+            "tab&#9;line&#10;carriage&#13;tail" => Ok(Self::TabHash9LineHash10CarriageHash13Tail),
+            "&#x85;next&#x2028;line" => Ok(Self::Hashx85NextHashx2028Line),
+            _ => Err(format!("Unknown Status variant: {}", s)),
+        }
+    }
+}
+
+impl std::fmt::Display for Status {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", self.as_str())
+    }
+}
diff --git a/research/data/runtime-followups-2026-10-03/entities/baseline/cli-proof/mod.rs b/research/data/runtime-followups-2026-10-03/entities/baseline/cli-proof/mod.rs
new file mode 100644
index 0000000..cdd253c
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/baseline/cli-proof/mod.rs
@@ -0,0 +1,2 @@
+pub mod enum_literal_escaping;
+pub use enum_literal_escaping::*;
diff --git a/research/data/runtime-followups-2026-10-03/entities/baseline/native-proof.json b/research/data/runtime-followups-2026-10-03/entities/baseline/native-proof.json
new file mode 100644
index 0000000..c291e62
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/baseline/native-proof.json
@@ -0,0 +1,6 @@
+{
+  "result": "rejected",
+  "error": "Scalar parse error for field 'status': expected enumeration, got 'R&D'",
+  "module": "/home/bailey/github/polyxml-perf-selected/crates/polyxml-python/python/polyxml/_polyxml.abi3.so",
+  "sha256": "3eb1ac4f969508274e2f0073ed35e142a9be876278add61eff1e2977b70c4eb0"
+}
diff --git a/research/data/runtime-followups-2026-10-03/entities/baseline/proof.txt b/research/data/runtime-followups-2026-10-03/entities/baseline/proof.txt
new file mode 100644
index 0000000..d76e530
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/baseline/proof.txt
@@ -0,0 +1,4 @@
+Parsing schema: /home/bailey/github/polyxml-xsd-attributes/research/fixtures/enum_literal_escaping.xsd
+  Types: 1 total (0 structs, 1 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
diff --git a/research/data/runtime-followups-2026-10-03/entities/candidate/AttrDecl.txt b/research/data/runtime-followups-2026-10-03/entities/candidate/AttrDecl.txt
new file mode 100644
index 0000000..a3036bc
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/candidate/AttrDecl.txt
@@ -0,0 +1,23 @@
+memcap: <=7667 MiB (60% of 12779 MiB available) [systemd MemoryMax, swap off]
+╭───────────────────────────────────────────────────────────╮
+│ PolyXML W3C XML Schema Conformance Suite                  │
+│ Compiler Binary: /tmp/polyxml-followup-entity-bin/polyxml │
+│ W3C Submodule: /home/bailey/github/polyxml-w3c-tests/w3c  │
+│ Selected Suite: AttrDecl                                  │
+╰───────────────────────────────────────────────────────────╯
+Executing 50 test group(s)...
+
+  Testing AttrDecl/ad_name00108m5... ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 100% 0:00:00
+
+       W3C XML Schema Conformance Summary        
+┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━┳━━━━━━━━┓
+┃ Category                     ┃ Count ┃   Rate ┃
+┡━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━╇━━━━━━━━┩
+│ Total Test Groups            │    50 │ 100.0% │
+│ Schema Compilations Passed   │    50 │ 100.0% │
+│ Schema Compilations Failed   │     0 │   0.0% │
+│ Valid Instances Evaluated    │    50 │      - │
+│ Roundtrip Validations Passed │    50 │ 100.0% │
+└──────────────────────────────┴───────┴────────┘
+
+All executed tests passed with 100% compliance!
diff --git a/research/data/runtime-followups-2026-10-03/entities/candidate/CType.txt b/research/data/runtime-followups-2026-10-03/entities/candidate/CType.txt
new file mode 100644
index 0000000..8d33a24
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/candidate/CType.txt
@@ -0,0 +1,53 @@
+memcap: <=7670 MiB (60% of 12783 MiB available) [systemd MemoryMax, swap off]
+╭───────────────────────────────────────────────────────────╮
+│ PolyXML W3C XML Schema Conformance Suite                  │
+│ Compiler Binary: /tmp/polyxml-followup-entity-bin/polyxml │
+│ W3C Submodule: /home/bailey/github/polyxml-w3c-tests/w3c  │
+│ Selected Suite: CType                                     │
+╰───────────────────────────────────────────────────────────╯
+Executing 31 test group(s)...
+
+  Testing CType/targetns00101m... ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 100% 0:00:00
+
+       W3C XML Schema Conformance Summary        
+┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━┳━━━━━━━━┓
+┃ Category                     ┃ Count ┃   Rate ┃
+┡━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━╇━━━━━━━━┩
+│ Total Test Groups            │    31 │ 100.0% │
+│ Schema Compilations Passed   │    31 │ 100.0% │
+│ Schema Compilations Failed   │     0 │   0.0% │
+│ Valid Instances Evaluated    │    28 │      - │
+│ Roundtrip Validations Passed │    23 │  82.1% │
+└──────────────────────────────┴───────┴────────┘
+
+Failures & Exceptions (5 groups):
+┏━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━┓
+┃                    ┃               ┃     Instances      ┃ Error / First      ┃
+┃ Suite/Group        ┃ Schema Status ┃    (Pass/Total)    ┃ Failure            ┃
+┡━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━┩
+│ CType/basetd00101… │ PASS          │        0/1         │ Positive: FAIL -   │
+│                    │               │                    │ Root.__init__()    │
+│                    │               │                    │ missing 1 required │
+│                    │               │                    │ keyword-only       │
+│                    │               │                    │ argument: 'valu    │
+│ CType/basetd00101… │ PASS          │        0/1         │ Positive: FAIL -   │
+│                    │               │                    │ Root.__init__()    │
+│                    │               │                    │ missing 1 required │
+│                    │               │                    │ keyword-only       │
+│                    │               │                    │ argument: 'valu    │
+│ CType/derivationm… │ PASS          │        0/1         │ Positive: FAIL -   │
+│                    │               │                    │ B.__init__()       │
+│                    │               │                    │ missing 1 required │
+│                    │               │                    │ keyword-only       │
+│                    │               │                    │ argument: 'value'  │
+│ CType/psubstituti… │ PASS          │        1/2         │ pSubstitutions001… │
+│                    │               │                    │ FAIL - Schema      │
+│                    │               │                    │ error: Unexpected  │
+│                    │               │                    │ root element       │
+│                    │               │                    │ {pSubstitu         │
+│ CType/psubstituti… │ PASS          │        1/2         │ pSubstitutions001… │
+│                    │               │                    │ FAIL - Schema      │
+│                    │               │                    │ error: Unexpected  │
+│                    │               │                    │ root element       │
+│                    │               │                    │ {pSubstitu         │
+└────────────────────┴───────────────┴────────────────────┴────────────────────┘
diff --git a/research/data/runtime-followups-2026-10-03/entities/candidate/NIST.txt b/research/data/runtime-followups-2026-10-03/entities/candidate/NIST.txt
new file mode 100644
index 0000000..cf150cf
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/candidate/NIST.txt
@@ -0,0 +1,32 @@
+memcap: <=7665 MiB (60% of 12775 MiB available) [systemd MemoryMax, swap off]
+╭───────────────────────────────────────────────────────────╮
+│ PolyXML W3C XML Schema Conformance Suite                  │
+│ Compiler Binary: /tmp/polyxml-followup-entity-bin/polyxml │
+│ W3C Submodule: /home/bailey/github/polyxml-w3c-tests/w3c  │
+│ Selected Suite: NISTXMLSchemaDatatypes                    │
+╰───────────────────────────────────────────────────────────╯
+Executing 100 test group(s)...
+
+  Testing NIST2004-01-14/atomic-nonPositiveInteger-totalDigits... ━━━━ 100% 0:0…
+
+       W3C XML Schema Conformance Summary        
+┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━┳━━━━━━━━┓
+┃ Category                     ┃ Count ┃   Rate ┃
+┡━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━╇━━━━━━━━┩
+│ Total Test Groups            │   100 │ 100.0% │
+│ Schema Compilations Passed   │   100 │ 100.0% │
+│ Schema Compilations Failed   │     0 │   0.0% │
+│ Valid Instances Evaluated    │   452 │      - │
+│ Roundtrip Validations Passed │   447 │  98.9% │
+└──────────────────────────────┴───────┴────────┘
+
+Failures & Exceptions (1 groups):
+┏━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━┓
+┃                    ┃               ┃     Instances      ┃ Error / First      ┃
+┃ Suite/Group        ┃ Schema Status ┃    (Pass/Total)    ┃ Failure            ┃
+┡━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━┩
+│ NIST2004-01-14/at… │ PASS          │        0/5         │ NISTXML-SV-IV-ato… │
+│                    │               │                    │ FAIL - Scalar      │
+│                    │               │                    │ parse error for    │
+│                    │               │                    │ field 'v           │
+└────────────────────┴───────────────┴────────────────────┴────────────────────┘
diff --git a/research/data/runtime-followups-2026-10-03/entities/candidate/binding.txt b/research/data/runtime-followups-2026-10-03/entities/candidate/binding.txt
new file mode 100644
index 0000000..0e09560
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/candidate/binding.txt
@@ -0,0 +1,30 @@
+memcap: <=7703 MiB (60% of 12838 MiB available) [systemd MemoryMax, swap off]
+🍹 Building a mixed python/rust project
+🐍 Found CPython 3.14 at /home/bailey/github/polyxml-w3c-tests/.venv/bin/python
+🔗 Found pyo3 bindings with abi3-py3.12 support
+📡 Using build options features from pyproject.toml
+Checked 6 packages in 0.44ms
+   Compiling target-lexicon v0.13.5
+   Compiling syn v3.0.5
+   Compiling serde_core v1.0.229
+   Compiling pyo3-build-config v0.29.2
+   Compiling pyo3-ffi v0.29.2
+   Compiling serde_derive v1.0.229
+   Compiling libc v0.2.189
+   Compiling serde v1.0.229
+   Compiling syn v2.0.119
+   Compiling pyo3-macros-backend v0.29.2
+   Compiling pyo3 v0.29.2
+   Compiling thiserror-impl v2.0.21
+   Compiling minijinja v2.24.0
+   Compiling serde_json v1.0.151
+   Compiling thiserror v2.0.21
+   Compiling pyo3-macros v0.29.2
+   Compiling quick-xml v0.42.0
+   Compiling once_cell v1.21.4
+   Compiling polyxml v0.34.6 (/home/bailey/github/polyxml-xsd-attributes/crates/polyxml-core)
+   Compiling polyxml-python v0.34.6 (/home/bailey/github/polyxml-xsd-attributes/crates/polyxml-python)
+    Finished `dev` profile [unoptimized + debuginfo] target(s) in 25.79s
+📦 Built wheel for abi3 Python ≥ 3.12 to /tmp/.tmpRxhzYp/polyxml-0.34.6-cp312-abi3-linux_x86_64.whl
+✏️ Setting installed package as editable
+🛠 Installed polyxml-0.34.6
diff --git a/research/data/runtime-followups-2026-10-03/entities/candidate/cli-build.txt b/research/data/runtime-followups-2026-10-03/entities/candidate/cli-build.txt
new file mode 100644
index 0000000..e2d6ca1
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/candidate/cli-build.txt
@@ -0,0 +1,56 @@
+memcap: <=7795 MiB (60% of 12993 MiB available) [systemd MemoryMax, swap off]
+   Compiling proc-macro2 v1.0.107
+   Compiling quote v1.0.47
+   Compiling unicode-ident v1.0.24
+   Compiling serde_core v1.0.229
+   Compiling syn v3.0.5
+   Compiling lexical-util v1.0.7
+   Compiling memchr v2.8.3
+   Compiling serde v1.0.229
+   Compiling serde_derive v1.0.229
+   Compiling siphasher v1.0.3
+   Compiling utf8parse v0.2.2
+   Compiling zmij v1.0.23
+   Compiling anstyle-parse v1.0.0
+   Compiling phf_shared v0.14.0
+   Compiling aho-corasick v1.1.5
+   Compiling lexical-write-integer v1.0.6
+   Compiling lexical-parse-integer v1.0.6
+   Compiling fastrand v2.5.0
+   Compiling serde_json v1.0.151
+   Compiling heck v0.5.0
+   Compiling is_terminal_polyfill v1.70.2
+   Compiling colorchoice v1.0.5
+   Compiling anstyle-query v1.1.5
+   Compiling regex-syntax v0.8.11
+   Compiling anstyle v1.0.14
+   Compiling thiserror v2.0.21
+   Compiling anstream v1.0.0
+   Compiling regex-automata v0.4.18
+   Compiling phf_generator v0.14.0
+   Compiling lexical-parse-float v1.0.6
+   Compiling lexical-write-float v1.0.6
+   Compiling thiserror-impl v2.0.21
+   Compiling memo-map v0.3.4
+   Compiling strsim v0.11.1
+   Compiling clap_lex v1.1.0
+   Compiling itoa v1.0.18
+   Compiling winnow v1.0.4
+   Compiling toml_parser v1.1.3+spec-1.1.0
+   Compiling clap_builder v4.6.7
+   Compiling minijinja v2.24.0
+   Compiling lexical-core v1.0.6
+   Compiling phf_codegen v0.14.0
+   Compiling regex v1.13.1
+   Compiling clap_derive v4.6.7
+   Compiling quick-xml v0.42.0
+   Compiling serde_spanned v1.1.1
+   Compiling toml_datetime v1.1.1+spec-1.1.0
+   Compiling toml_writer v1.1.2+spec-1.1.0
+   Compiling smallvec v1.16.2
+   Compiling polyxml v0.34.6 (/home/bailey/github/polyxml-xsd-attributes/crates/polyxml-core)
+   Compiling toml v1.1.6+spec-1.1.0
+   Compiling clap v4.6.7
+   Compiling glob v0.3.4
+   Compiling polyxml-cli v0.34.6 (/home/bailey/github/polyxml-xsd-attributes/crates/polyxml-cli)
+    Finished `dev` profile [unoptimized + debuginfo] target(s) in 32.07s
diff --git a/research/data/runtime-followups-2026-10-03/entities/candidate/cli-proof/enum_literal_escaping.rs b/research/data/runtime-followups-2026-10-03/entities/candidate/cli-proof/enum_literal_escaping.rs
new file mode 100644
index 0000000..cf445af
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/candidate/cli-proof/enum_literal_escaping.rs
@@ -0,0 +1,125 @@
+// @generated by PolyXML Compiler (https://github.com/polyxml/PolyXML)
+#![allow(dead_code, unused_imports, unused_mut, unused_variables, unused_assignments, non_camel_case_types, non_snake_case)]
+
+use std::borrow::Cow;
+use serde::{Deserialize, Serialize};
+use std::str::FromStr;
+use quick_xml::events::{BytesEnd, BytesStart, BytesText, Event};
+use quick_xml::{Reader, Writer};
+use polyxml::{PolyXmlError, Result};
+
+#[allow(dead_code)]
+pub(crate) fn skip_xml_element(reader: &mut Reader<&[u8]>) -> Result<()> {
+    let mut depth = 1;
+    loop {
+        match reader.read_event()? {
+            Event::Start(_) => depth += 1,
+            Event::End(_) => {
+                depth -= 1;
+                if depth == 0 {
+                    break;
+                }
+            }
+            Event::Eof => break,
+            _ => {}
+        }
+    }
+    Ok(())
+}
+
+#[allow(dead_code)]
+pub(crate) fn read_element_text<'a>(reader: &mut Reader<&'a [u8]>, tag_name: &str) -> Result<Cow<'a, str>> {
+    let mut text = Cow::Borrowed("");
+    loop {
+        match reader.read_event()? {
+            Event::Text(t) => {
+                let raw = match t.into_inner() {
+                    Cow::Borrowed(b) => match quick_xml::escape::unescape(b)? {
+                        Cow::Borrowed(s) => Cow::Borrowed(s),
+                        Cow::Owned(s) => Cow::Owned(s),
+                    },
+                    Cow::Owned(s) => Cow::Owned(quick_xml::escape::unescape(&s)?.into_owned()),
+                };
+                if text.is_empty() {
+                    text = raw;
+                } else {
+                    text.to_mut().push_str(&raw);
+                }
+            }
+            Event::CData(c) => {
+                text.to_mut().push_str(c.as_ref());
+            }
+            Event::GeneralRef(r) => {
+                if r.is_char_ref() {
+                    if let Some(ch) = r.resolve_char_ref()? {
+                        text.to_mut().push(ch);
+                    }
+                } else if let Some(val) = quick_xml::escape::resolve_xml_entity(r.as_ref()) {
+                    text.to_mut().push_str(val);
+                } else {
+                    text.to_mut().push_str(r.as_ref());
+                }
+            }
+            Event::End(e) if e.local_name().as_ref() == tag_name => break,
+            Event::Eof => break,
+            _ => {}
+        }
+    }
+    Ok(text)
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Default, Serialize, Deserialize)]
+pub enum Status {
+    #[serde(rename = "R&D")]
+    #[default]
+    Rd,
+    #[serde(rename = "\"quoted\" 'value' <tag>")]
+    QuotedValueTag,
+    #[serde(rename = "café 😀")]
+    Café,
+    #[serde(rename = "literal &amp;")]
+    LiteralAmp,
+    #[serde(rename = "slash\\path\\u000a")]
+    SlashPathU000a,
+    #[serde(rename = "tab\tline\ncarriage\rtail")]
+    TabLineCarriageTail,
+    #[serde(rename = "\u{85}next\u{2028}line")]
+    NextLine,
+}
+
+impl Status {
+    pub fn as_str(&self) -> &'static str {
+        match self {
+            Self::Rd => "R&D",
+            Self::QuotedValueTag => "\"quoted\" 'value' <tag>",
+            Self::Café => "café 😀",
+            Self::LiteralAmp => "literal &amp;",
+            Self::SlashPathU000a => "slash\\path\\u000a",
+            Self::TabLineCarriageTail => "tab\tline\ncarriage\rtail",
+            Self::NextLine => "\u{85}next\u{2028}line",
+        }
+    }
+}
+
+impl std::str::FromStr for Status {
+    type Err = String;
+
+    fn from_str(s: &str) -> std::result::Result<Self, Self::Err> {
+        match s {
+            "R&D" => Ok(Self::Rd),
+            "\"quoted\" 'value' <tag>" => Ok(Self::QuotedValueTag),
+            "café 😀" => Ok(Self::Café),
+            "literal &amp;" => Ok(Self::LiteralAmp),
+            "slash\\path\\u000a" => Ok(Self::SlashPathU000a),
+            "tab\tline\ncarriage\rtail" => Ok(Self::TabLineCarriageTail),
+            "\u{85}next\u{2028}line" => Ok(Self::NextLine),
+            _ => Err(format!("Unknown Status variant: {}", s)),
+        }
+    }
+}
+
+impl std::fmt::Display for Status {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", self.as_str())
+    }
+}
diff --git a/research/data/runtime-followups-2026-10-03/entities/candidate/cli-proof/mod.rs b/research/data/runtime-followups-2026-10-03/entities/candidate/cli-proof/mod.rs
new file mode 100644
index 0000000..cdd253c
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/candidate/cli-proof/mod.rs
@@ -0,0 +1,2 @@
+pub mod enum_literal_escaping;
+pub use enum_literal_escaping::*;
diff --git a/research/data/runtime-followups-2026-10-03/entities/candidate/native-proof.json b/research/data/runtime-followups-2026-10-03/entities/candidate/native-proof.json
new file mode 100644
index 0000000..b2f1fca
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/candidate/native-proof.json
@@ -0,0 +1,6 @@
+{
+  "result": "accepted",
+  "json": "{\"Code\":\"A&B\",\"Default\":\"caf\u00e9\",\"Fixed\":\"R&D\",\"Status\":\"R&D\",\"label\":\"<label>\",\"mode\":\"R&D\"}",
+  "module": "/home/bailey/github/polyxml-xsd-attributes/crates/polyxml-python/python/polyxml/_polyxml.abi3.so",
+  "sha256": "1c68a5177253ad4f9009c9ce586124241b5c4c3ff39b11d00a191227cbfe1a2d"
+}
diff --git a/research/data/runtime-followups-2026-10-03/entities/candidate/proof.txt b/research/data/runtime-followups-2026-10-03/entities/candidate/proof.txt
new file mode 100644
index 0000000..d76e530
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/candidate/proof.txt
@@ -0,0 +1,4 @@
+Parsing schema: /home/bailey/github/polyxml-xsd-attributes/research/fixtures/enum_literal_escaping.xsd
+  Types: 1 total (0 structs, 1 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
diff --git a/research/data/runtime-followups-2026-10-03/entities/corpus-comparison.json b/research/data/runtime-followups-2026-10-03/entities/corpus-comparison.json
new file mode 100644
index 0000000..e274fc4
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/corpus-comparison.json
@@ -0,0 +1,53 @@
+{
+  "CType": {
+    "identical_results": true,
+    "baseline_summary": [
+      "\u2502 Total Test Groups            \u2502    31 \u2502 100.0% \u2502",
+      "\u2502 Schema Compilations Passed   \u2502    31 \u2502 100.0% \u2502",
+      "\u2502 Schema Compilations Failed   \u2502     0 \u2502   0.0% \u2502",
+      "\u2502 Valid Instances Evaluated    \u2502    28 \u2502      - \u2502",
+      "\u2502 Roundtrip Validations Passed \u2502    23 \u2502  82.1% \u2502"
+    ],
+    "candidate_summary": [
+      "\u2502 Total Test Groups            \u2502    31 \u2502 100.0% \u2502",
+      "\u2502 Schema Compilations Passed   \u2502    31 \u2502 100.0% \u2502",
+      "\u2502 Schema Compilations Failed   \u2502     0 \u2502   0.0% \u2502",
+      "\u2502 Valid Instances Evaluated    \u2502    28 \u2502      - \u2502",
+      "\u2502 Roundtrip Validations Passed \u2502    23 \u2502  82.1% \u2502"
+    ]
+  },
+  "AttrDecl": {
+    "identical_results": true,
+    "baseline_summary": [
+      "\u2502 Total Test Groups            \u2502    50 \u2502 100.0% \u2502",
+      "\u2502 Schema Compilations Passed   \u2502    50 \u2502 100.0% \u2502",
+      "\u2502 Schema Compilations Failed   \u2502     0 \u2502   0.0% \u2502",
+      "\u2502 Valid Instances Evaluated    \u2502    50 \u2502      - \u2502",
+      "\u2502 Roundtrip Validations Passed \u2502    50 \u2502 100.0% \u2502"
+    ],
+    "candidate_summary": [
+      "\u2502 Total Test Groups            \u2502    50 \u2502 100.0% \u2502",
+      "\u2502 Schema Compilations Passed   \u2502    50 \u2502 100.0% \u2502",
+      "\u2502 Schema Compilations Failed   \u2502     0 \u2502   0.0% \u2502",
+      "\u2502 Valid Instances Evaluated    \u2502    50 \u2502      - \u2502",
+      "\u2502 Roundtrip Validations Passed \u2502    50 \u2502 100.0% \u2502"
+    ]
+  },
+  "NIST": {
+    "identical_results": true,
+    "baseline_summary": [
+      "\u2502 Total Test Groups            \u2502   100 \u2502 100.0% \u2502",
+      "\u2502 Schema Compilations Passed   \u2502   100 \u2502 100.0% \u2502",
+      "\u2502 Schema Compilations Failed   \u2502     0 \u2502   0.0% \u2502",
+      "\u2502 Valid Instances Evaluated    \u2502   452 \u2502      - \u2502",
+      "\u2502 Roundtrip Validations Passed \u2502   447 \u2502  98.9% \u2502"
+    ],
+    "candidate_summary": [
+      "\u2502 Total Test Groups            \u2502   100 \u2502 100.0% \u2502",
+      "\u2502 Schema Compilations Passed   \u2502   100 \u2502 100.0% \u2502",
+      "\u2502 Schema Compilations Failed   \u2502     0 \u2502   0.0% \u2502",
+      "\u2502 Valid Instances Evaluated    \u2502   452 \u2502      - \u2502",
+      "\u2502 Roundtrip Validations Passed \u2502   447 \u2502  98.9% \u2502"
+    ]
+  }
+}
diff --git a/research/data/runtime-followups-2026-10-03/entities/decoded-but-unescaped-rust/generation.log b/research/data/runtime-followups-2026-10-03/entities/decoded-but-unescaped-rust/generation.log
new file mode 100644
index 0000000..92f3576
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/decoded-but-unescaped-rust/generation.log
@@ -0,0 +1,4 @@
+Parsing schema: research/fixtures/schema_attribute_entities.xsd
+  Types: 3 total (1 structs, 1 enums, 0 unions, 1 simple restrictions)
+  Root elements: 1
+Code generation complete.
diff --git a/research/data/runtime-followups-2026-10-03/entities/decoded-but-unescaped-rust/rust-syntax.log b/research/data/runtime-followups-2026-10-03/entities/decoded-but-unescaped-rust/rust-syntax.log
new file mode 100644
index 0000000..171e68e
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/decoded-but-unescaped-rust/rust-syntax.log
@@ -0,0 +1,14 @@
+error: expected one of `,`, `.`, `?`, `}`, or an operator, found `" 'value' <tag>"`
+  --> /tmp/polyxml-entity-before/rust/schema_attribute_entities.rs:96:45
+   |
+96 |             Self::QuotedValueTag => ""quoted" 'value' <tag>",
+   |                                  --         ^^^^^^^^^^^^^^^^ expected one of `,`, `.`, `?`, `}`, or an operator
+   |                                  |
+   |                                  while parsing the `match` arm starting here
+
+error: expected one of `...`, `..=`, `..`, `=>`, `if`, or `|`, found `" 'value' <tag>"`
+   --> /tmp/polyxml-entity-before/rust/schema_attribute_entities.rs:109:21
+    |
+109 |             ""quoted" 'value' <tag>" => Ok(Self::QuotedValueTag),
+    |                     ^^^^^^^^^^^^^^^^ expected one of `...`, `..=`, `..`, `=>`, `if`, or `|`
+
diff --git a/research/data/runtime-followups-2026-10-03/entities/decoded-but-unescaped-rust/rust/mod.rs b/research/data/runtime-followups-2026-10-03/entities/decoded-but-unescaped-rust/rust/mod.rs
new file mode 100644
index 0000000..6d454ad
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/decoded-but-unescaped-rust/rust/mod.rs
@@ -0,0 +1,2 @@
+pub mod schema_attribute_entities;
+pub use schema_attribute_entities::*;
diff --git a/research/data/runtime-followups-2026-10-03/entities/decoded-but-unescaped-rust/rust/schema_attribute_entities.rs b/research/data/runtime-followups-2026-10-03/entities/decoded-but-unescaped-rust/rust/schema_attribute_entities.rs
new file mode 100644
index 0000000..796a7dd
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/decoded-but-unescaped-rust/rust/schema_attribute_entities.rs
@@ -0,0 +1,356 @@
+// @generated by PolyXML Compiler (https://github.com/polyxml/PolyXML)
+#![allow(dead_code, unused_imports, unused_mut, unused_variables, unused_assignments, non_camel_case_types, non_snake_case)]
+
+use std::borrow::Cow;
+use serde::{Deserialize, Serialize};
+use std::str::FromStr;
+use quick_xml::events::{BytesEnd, BytesStart, BytesText, Event};
+use quick_xml::{Reader, Writer};
+use polyxml::{PolyXmlError, Result};
+
+#[allow(dead_code)]
+pub(crate) fn skip_xml_element(reader: &mut Reader<&[u8]>) -> Result<()> {
+    let mut depth = 1;
+    loop {
+        match reader.read_event()? {
+            Event::Start(_) => depth += 1,
+            Event::End(_) => {
+                depth -= 1;
+                if depth == 0 {
+                    break;
+                }
+            }
+            Event::Eof => break,
+            _ => {}
+        }
+    }
+    Ok(())
+}
+
+#[allow(dead_code)]
+pub(crate) fn read_element_text<'a>(reader: &mut Reader<&'a [u8]>, tag_name: &str) -> Result<Cow<'a, str>> {
+    let mut text = Cow::Borrowed("");
+    loop {
+        match reader.read_event()? {
+            Event::Text(t) => {
+                let raw = match t.into_inner() {
+                    Cow::Borrowed(b) => match quick_xml::escape::unescape(b)? {
+                        Cow::Borrowed(s) => Cow::Borrowed(s),
+                        Cow::Owned(s) => Cow::Owned(s),
+                    },
+                    Cow::Owned(s) => Cow::Owned(quick_xml::escape::unescape(&s)?.into_owned()),
+                };
+                if text.is_empty() {
+                    text = raw;
+                } else {
+                    text.to_mut().push_str(&raw);
+                }
+            }
+            Event::CData(c) => {
+                text.to_mut().push_str(c.as_ref());
+            }
+            Event::GeneralRef(r) => {
+                if r.is_char_ref() {
+                    if let Some(ch) = r.resolve_char_ref()? {
+                        text.to_mut().push(ch);
+                    }
+                } else if let Some(val) = quick_xml::escape::resolve_xml_entity(r.as_ref()) {
+                    text.to_mut().push_str(val);
+                } else {
+                    text.to_mut().push_str(r.as_ref());
+                }
+            }
+            Event::End(e) if e.local_name().as_ref() == tag_name => break,
+            Event::Eof => break,
+            _ => {}
+        }
+    }
+    Ok(text)
+}
+
+pub type Code<'a> = Cow<'a, str>;
+pub fn validate_Code_patterns(value: &str) -> std::result::Result<(), &'static str> {
+    static PATTERN_0: std::sync::OnceLock<std::result::Result<regex::Regex, regex::Error>> = std::sync::OnceLock::new();
+    let pattern = PATTERN_0.get_or_init(|| regex::Regex::new("\\A(?:[A-Z]&[A-Z])\\z")).as_ref().map_err(|_| "unsupported pattern syntax")?;
+    if !pattern.is_match(value) { return Err("pattern constraint failed"); }
+    Ok(())
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Default, Serialize, Deserialize)]
+pub enum Status {
+    #[serde(rename = "R&D")]
+    #[default]
+    Rd,
+    #[serde(rename = ""quoted" 'value' <tag>")]
+    QuotedValueTag,
+    #[serde(rename = "café 😀")]
+    Café,
+    #[serde(rename = "literal &amp;")]
+    LiteralAmp,
+}
+
+impl Status {
+    pub fn as_str(&self) -> &'static str {
+        match self {
+            Self::Rd => "R&D",
+            Self::QuotedValueTag => ""quoted" 'value' <tag>",
+            Self::Café => "café 😀",
+            Self::LiteralAmp => "literal &amp;",
+        }
+    }
+}
+
+impl std::str::FromStr for Status {
+    type Err = String;
+
+    fn from_str(s: &str) -> std::result::Result<Self, Self::Err> {
+        match s {
+            "R&D" => Ok(Self::Rd),
+            ""quoted" 'value' <tag>" => Ok(Self::QuotedValueTag),
+            "café 😀" => Ok(Self::Café),
+            "literal &amp;" => Ok(Self::LiteralAmp),
+            _ => Err(format!("Unknown Status variant: {}", s)),
+        }
+    }
+}
+
+impl std::fmt::Display for Status {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", self.as_str())
+    }
+}
+
+#[derive(Debug, Clone, PartialEq, Default, Serialize, Deserialize)]
+pub struct RootType<'a> {
+    #[serde(rename = "Status")]
+    pub status: Status,
+    #[serde(rename = "Code")]
+    pub code: Code<'a>,
+    #[serde(rename = "Fixed")]
+    pub fixed: Cow<'a, str>,
+    #[serde(rename = "Default")]
+    pub default: Cow<'a, str>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub label: Option<Cow<'a, str>>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub mode: Option<Cow<'a, str>>,
+}
+
+impl<'a> RootType<'a> {
+    pub fn from_xml(xml: &'a str) -> Result<Self>
+    {
+        let mut reader = Reader::from_str(xml);
+        loop {
+            match reader.read_event()? {
+                Event::Start(e) => return Self::decode_xml(&mut reader, &e),
+                Event::Empty(e) => return Self::decode_xml_empty(&e),
+                Event::Eof => break,
+                _ => {}
+            }
+        }
+        Err(PolyXmlError::SchemaError("Unexpected EOF while parsing RootType".into()))
+    }
+
+    pub fn from_xml_bytes(xml_bytes: &'a [u8]) -> Result<Self>
+    {
+        let s = std::str::from_utf8(xml_bytes)?;
+        Self::from_xml(s)
+    }
+
+    pub fn decode_xml(reader: &mut Reader<&'a [u8]>, start: &BytesStart<'_>) -> Result<Self>
+    {
+        let mut var_status = None;
+        let mut var_code = None;
+        let mut var_fixed = None;
+        let mut var_default = None;
+        let mut var_label = None;
+        let mut var_mode = None;
+
+        for attr in start.attributes() {
+            let attr = attr?;
+            match attr.key.local_name().as_ref() {
+                "label" => {
+                    let s = attr.value.as_ref();
+                    let val: Cow<'_, str> = match quick_xml::escape::unescape(s)? {
+                        Cow::Borrowed(s) => Cow::Owned(s.to_string()),
+                        Cow::Owned(s) => Cow::Owned(s),
+                    };
+                    var_label = Some(val);
+                }
+                "mode" => {
+                    let s = attr.value.as_ref();
+                    let val: Cow<'_, str> = match quick_xml::escape::unescape(s)? {
+                        Cow::Borrowed(s) => Cow::Owned(s.to_string()),
+                        Cow::Owned(s) => Cow::Owned(s),
+                    };
+                    var_mode = Some(val);
+                }
+                _ => {}
+            }
+        }
+
+        loop {
+            match reader.read_event()? {
+                Event::Start(e) => match e.local_name().as_ref() {
+                    "Status" => {
+                        let text = read_element_text(reader, "Status")?;
+                        let s = text.trim();
+                        let val = Status::from_str(s).map_err(|_| PolyXmlError::ScalarParseError { field: "status".into(), expected: "Status", value: s.into() })?;
+                        var_status = Some(val);
+                    }
+                    "Code" => {
+                        let text = read_element_text(reader, "Code")?;
+        validate_Code_patterns(&text).map_err(|message| PolyXmlError::FacetViolation { field: "code".into(), expected: message.into(), actual: (&text).to_string() })?;
+                        var_code = Some(text);
+                    }
+                    "Fixed" => {
+                        let text = read_element_text(reader, "Fixed")?;
+                        var_fixed = Some(text);
+                    }
+                    "Default" => {
+                        let text = read_element_text(reader, "Default")?;
+                        var_default = Some(text);
+                    }
+                    _ => {
+                        skip_xml_element(reader)?;
+                    }
+                },
+                Event::Empty(e) => match e.local_name().as_ref() {
+                    "Status" => {
+                    }
+                    "Code" => {
+        validate_Code_patterns("").map_err(|message| PolyXmlError::FacetViolation { field: "code".into(), expected: message.into(), actual: ("").to_string() })?;
+                        var_code = Some(Cow::Borrowed(""));
+                    }
+                    "Fixed" => {
+                        var_fixed = Some(Cow::Borrowed(""));
+                    }
+                    "Default" => {
+                        var_default = Some(Cow::Borrowed(""));
+                    }
+                    _ => {}
+                },
+                Event::End(e) if e.local_name().as_ref() == start.local_name().as_ref() => break,
+                Event::Eof => break,
+                _ => {}
+            }
+        }
+
+        let value = Self {
+            status: var_status.ok_or_else(|| PolyXmlError::SchemaError("Missing required field 'Status'".into()))?,
+            code: var_code.ok_or_else(|| PolyXmlError::SchemaError("Missing required field 'Code'".into()))?,
+            fixed: var_fixed.ok_or_else(|| PolyXmlError::SchemaError("Missing required field 'Fixed'".into()))?,
+            default: var_default.ok_or_else(|| PolyXmlError::SchemaError("Missing required field 'Default'".into()))?,
+            label: var_label,
+            mode: var_mode,
+        };
+        value.validate_patterns()?;
+        Ok(value)
+    }
+
+    pub fn decode_xml_empty(start: &BytesStart<'_>) -> Result<Self> {
+        let mut var_status = None;
+        let mut var_code = None;
+        let mut var_fixed = None;
+        let mut var_default = None;
+        let mut var_label = None;
+        let mut var_mode = None;
+
+        for attr in start.attributes() {
+            let attr = attr?;
+            match attr.key.local_name().as_ref() {
+                "label" => {
+                    let s = attr.value.as_ref();
+                    let val: Cow<'_, str> = match quick_xml::escape::unescape(s)? {
+                        Cow::Borrowed(s) => Cow::Owned(s.to_string()),
+                        Cow::Owned(s) => Cow::Owned(s),
+                    };
+                    var_label = Some(val);
+                }
+                "mode" => {
+                    let s = attr.value.as_ref();
+                    let val: Cow<'_, str> = match quick_xml::escape::unescape(s)? {
+                        Cow::Borrowed(s) => Cow::Owned(s.to_string()),
+                        Cow::Owned(s) => Cow::Owned(s),
+                    };
+                    var_mode = Some(val);
+                }
+                _ => {}
+            }
+        }
+
+        let value = Self {
+            status: var_status.unwrap_or_default(),
+            code: var_code.unwrap_or(Cow::Borrowed("")),
+            fixed: var_fixed.unwrap_or(Cow::Borrowed("")),
+            default: var_default.unwrap_or(Cow::Borrowed("")),
+            label: var_label,
+            mode: var_mode,
+        };
+        value.validate_patterns()?;
+        Ok(value)
+    }
+
+    pub fn to_xml(&self) -> Result<Vec<u8>> {
+        let mut buf = Vec::new();
+        let mut writer = Writer::new(std::io::Cursor::new(&mut buf));
+        self.encode_xml(&mut writer, None)?;
+        Ok(buf)
+    }
+
+    pub fn to_xml_string(&self) -> Result<String> {
+        let bytes = self.to_xml()?;
+        String::from_utf8(bytes).map_err(|e| PolyXmlError::Utf8Error(e.utf8_error()))
+    }
+
+    pub fn from_json_str(json_str: &'a str) -> std::result::Result<Self, serde_json::Error>
+    {
+        serde_json::from_str(json_str)
+    }
+
+    pub fn from_json_slice(bytes: &'a [u8]) -> std::result::Result<Self, serde_json::Error>
+    {
+        serde_json::from_slice(bytes)
+    }
+
+    pub fn to_json_string(&self) -> std::result::Result<String, serde_json::Error> {
+        serde_json::to_string(self)
+    }
+
+    pub fn to_json_vec(&self) -> std::result::Result<Vec<u8>, serde_json::Error> {
+        serde_json::to_vec(self)
+    }
+
+    pub fn validate_patterns(&self) -> Result<()> {
+        validate_Code_patterns(&self.code.to_string()).map_err(|message| PolyXmlError::FacetViolation { field: "code".into(), expected: message.into(), actual: (&self.code.to_string()).to_string() })?;
+        Ok(())
+    }
+    pub fn encode_xml<W: std::io::Write>(&self, writer: &mut Writer<W>, tag_name: Option<&str>) -> Result<()> {
+        self.validate_patterns()?;
+        let tag = tag_name.unwrap_or("RootType");
+        let mut start = BytesStart::new(tag);
+        if let Some(ref val) = self.label {
+            start.push_attribute(("label", val.as_ref()));
+        }
+        if let Some(ref val) = self.mode {
+            start.push_attribute(("mode", val.as_ref()));
+        }
+        writer.write_event(Event::Start(start))?;
+        writer.write_event(Event::Start(BytesStart::new("Status")))?;
+        writer.write_event(Event::Text(BytesText::new(self.status.as_str())))?;
+        writer.write_event(Event::End(BytesEnd::new("Status")))?;
+        writer.write_event(Event::Start(BytesStart::new("Code")))?;
+        writer.write_event(Event::Text(BytesText::new(self.code.as_ref())))?;
+        writer.write_event(Event::End(BytesEnd::new("Code")))?;
+        writer.write_event(Event::Start(BytesStart::new("Fixed")))?;
+        writer.write_event(Event::Text(BytesText::new(self.fixed.as_ref())))?;
+        writer.write_event(Event::End(BytesEnd::new("Fixed")))?;
+        writer.write_event(Event::Start(BytesStart::new("Default")))?;
+        writer.write_event(Event::Text(BytesText::new(self.default.as_ref())))?;
+        writer.write_event(Event::End(BytesEnd::new("Default")))?;
+        writer.write_event(Event::End(BytesEnd::new(tag)))?;
+        Ok(())
+    }
+}
+
+pub type Root<'a> = RootType<'a>;
diff --git a/research/data/runtime-followups-2026-10-03/entities/entity-tests.txt b/research/data/runtime-followups-2026-10-03/entities/entity-tests.txt
new file mode 100644
index 0000000..894e8c4
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/entity-tests.txt
@@ -0,0 +1,13 @@
+memcap: <=7851 MiB (60% of 13085 MiB available) [systemd MemoryMax, swap off]
+   Compiling polyxml v0.34.6 (/home/bailey/github/polyxml-xsd-attributes/crates/polyxml-core)
+    Finished `test` profile [unoptimized + debuginfo] target(s) in 6.86s
+     Running tests/test_schema_attribute_entities.rs (/home/bailey/github/PolyXML/target/debug/deps/test_schema_attribute_entities-9c9a3aa83120aff2)
+
+running 4 tests
+test malformed_attributes_and_undefined_entities_are_errors_even_in_skipped_content ... ok
+test literal_attribute_whitespace_is_normalized_but_character_references_survive ... ok
+test namespace_and_qname_attributes_are_normalized_consistently ... ok
+test attribute_entities_reach_enum_facets_and_defaults_in_value_space ... ok
+
+test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
diff --git a/research/data/runtime-followups-2026-10-03/entities/independent-validator.txt b/research/data/runtime-followups-2026-10-03/entities/independent-validator.txt
new file mode 100644
index 0000000..f83518e
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/independent-validator.txt
@@ -0,0 +1,3 @@
+WARN `--no-project` was provided, but no project was found
+lxml (6, 1, 3, 0) libxml2 (2, 14, 6)
+Fixture and all four valid instances pass independent XSD validation
diff --git a/research/data/runtime-followups-2026-10-03/entities/probe-binding.py b/research/data/runtime-followups-2026-10-03/entities/probe-binding.py
new file mode 100644
index 0000000..c90d534
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/probe-binding.py
@@ -0,0 +1,16 @@
+import hashlib,json,sys
+from pathlib import Path
+import polyxml
+import polyxml._polyxml as native
+expected=sys.argv[1]
+fixture='/home/bailey/github/polyxml-xsd-attributes/research/fixtures/schema_attribute_entities.xsd'
+xml=b'<Root><Status>R&amp;D</Status><Code>A&amp;B</Code><Fixed/><Default/></Root>'
+try:
+    result=polyxml.xml_to_json(xml,schema_path=fixture,root='Root')
+    output={'result':'accepted','json':result.decode()}
+except ValueError as error:
+    output={'result':'rejected','error':str(error)}
+output['module']=native.__file__
+output['sha256']=hashlib.sha256(Path(native.__file__).read_bytes()).hexdigest()
+assert output['result']==expected, output
+print(json.dumps(output,indent=2))
diff --git a/research/data/runtime-followups-2026-10-03/entities/quality-gate.txt b/research/data/runtime-followups-2026-10-03/entities/quality-gate.txt
new file mode 100644
index 0000000..f6fcbf6
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/quality-gate.txt
@@ -0,0 +1,773 @@
+memcap: <=7786 MiB (60% of 12978 MiB available) [systemd MemoryMax, swap off]
+==> [1/6] Running Rust format check (cargo fmt)...
+==> [2/6] Running Rust Clippy (cargo clippy -D warnings)...
+    Checking polyxml v0.34.6 (/home/bailey/github/polyxml-xsd-attributes/crates/polyxml-core)
+   Compiling pyo3-ffi v0.29.2
+   Compiling pyo3 v0.29.2
+    Checking polyxml-cli v0.34.6 (/home/bailey/github/polyxml-xsd-attributes/crates/polyxml-cli)
+    Checking polyxml-js v0.34.6 (/home/bailey/github/polyxml-xsd-attributes/crates/polyxml-js)
+    Checking polyxml-wasm v0.34.6 (/home/bailey/github/polyxml-xsd-attributes/crates/polyxml-wasm)
+    Checking polyxml-python v0.34.6 (/home/bailey/github/polyxml-xsd-attributes/crates/polyxml-python)
+    Checking polyxml-c v0.34.6 (/home/bailey/github/polyxml-xsd-attributes/crates/polyxml-c)
+    Finished `dev` profile [unoptimized + debuginfo] target(s) in 10.41s
+==> [3/6] Running Rust workspace tests (cargo test)...
+   Compiling polyxml v0.34.6 (/home/bailey/github/polyxml-xsd-attributes/crates/polyxml-core)
+   Compiling polyxml-cli v0.34.6 (/home/bailey/github/polyxml-xsd-attributes/crates/polyxml-cli)
+   Compiling pyo3-ffi v0.29.2
+   Compiling pyo3 v0.29.2
+   Compiling polyxml-wasm v0.34.6 (/home/bailey/github/polyxml-xsd-attributes/crates/polyxml-wasm)
+   Compiling polyxml-js v0.34.6 (/home/bailey/github/polyxml-xsd-attributes/crates/polyxml-js)
+   Compiling polyxml-python v0.34.6 (/home/bailey/github/polyxml-xsd-attributes/crates/polyxml-python)
+   Compiling polyxml-c v0.34.6 (/home/bailey/github/polyxml-xsd-attributes/crates/polyxml-c)
+    Finished `test` profile [unoptimized + debuginfo] target(s) in 37.22s
+     Running unittests src/lib.rs (target/debug/deps/polyxml-675b717e531d04ed)
+
+running 16 tests
+test integer::tests::comparison_uses_sign_and_magnitude ... ok
+test ir::chunker::tests::test_topological_scc_chunking_dag_invariants ... ok
+test ir::root_selection_tests::field_reference_keeps_substitution_group_members ... ok
+test ir::root_selection_tests::inherited_base_does_not_select_sibling_types ... ok
+test ir::root_selection_tests::keeps_references_descendants_and_substitutions ... ok
+test ir::root_selection_tests::rejects_missing_and_ambiguous_roots ... ok
+test json::tests::test_json_deserialization_accepts_python_field_names ... ok
+test json::tests::test_json_roundtrip_primitives ... ok
+test pattern::tests::bounded_cache_evicts_and_retains_invalid_results ... ok
+test pattern::tests::cache_matches_uncached_regex_under_churn_and_concurrency ... ok
+test pattern::tests::cyclic_working_set_above_capacity_keeps_reusing_entries ... ok
+test tests::test_deserialization_does_not_confuse_xmlns_with_attributes ... ok
+test tests::test_namespaced_serialization ... ok
+test tests::test_nested_elements_and_lists ... ok
+test tests::test_roundtrip_serialization_deserialization ... ok
+test tests::test_streaming_xml_item_stream ... ok
+
+test result: ok. 16 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.18s
+
+     Running tests/test_adversarial_identifiers.rs (target/debug/deps/test_adversarial_identifiers-34056256ccaa17cb)
+
+running 7 tests
+test test_cpp_adversarial_compilation ... ok
+test test_csharp_adversarial_compilation ... ok
+test test_go_adversarial_compilation ... ok
+test test_java_adversarial_compilation ... ok
+test test_python_adversarial_compilation ... ok
+test test_rust_adversarial_compilation ... ok
+test test_typescript_adversarial_compilation ... ok
+
+test result: ok. 7 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 2.55s
+
+     Running tests/test_any_attribute.rs (target/debug/deps/test_any_attribute-d5795d9c5e0fdefd)
+
+running 1 test
+test test_any_attribute_schema_parser_and_runtime_roundtrip ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_any_element.rs (target/debug/deps/test_any_element-1fb225d6616938e8)
+
+running 2 tests
+test test_any_element_go_codegen ... ok
+test test_any_element_schema_parser_and_runtime_roundtrip ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_conformance.rs (target/debug/deps/test_conformance-0b37810d65fedfce)
+
+running 4 tests
+test test_atom_feed_conformance ... ok
+test test_soap_envelope_conformance ... ok
+test test_streaming_catalog_conformance ... ok
+test test_ubl_invoice_conformance ... ok
+
+test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.02s
+
+     Running tests/test_core.rs (target/debug/deps/test_core-f4cc1079f88df2bc)
+
+running 9 tests
+test integer_mappings_keep_fixed_width_builtins ... ok
+test test_all_scalar_types ... ok
+test test_error_handling_invalid_scalars ... ok
+test test_gregorian_partial_date_lexical_validation ... ok
+test test_malformed_xml_syntax_error ... ok
+test test_roundtrip_serialization_with_indentation ... ok
+test test_xsd_gregorian_fields_round_trip_and_reject_invalid_dates ... ok
+test test_xsi_nil_handling ... ok
+test unbounded_integers_round_trip_and_compare_exact_bounds ... ok
+
+test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
+
+     Running tests/test_cpp_codegen.rs (target/debug/deps/test_cpp_codegen-a4cd5571504c64d5)
+
+running 14 tests
+test mixed_content_mutual_cycle_compiles ... ok
+test mixed_content_self_cycle_compiles ... ok
+test simple_aliases_follow_their_base_types ... ok
+test test_cpp_choice_variant_compilation ... Choice pattern matching passed.
+ok
+test test_cpp_cmake_and_meson_generation ... ok
+test test_cpp_cmake_modules_file_set ... ok
+test test_cpp_from_xsd_schema ... ISO 20022 pacs.008 C++20 test passed.
+ok
+test test_cpp_glaze_backend_meta_generation ... ok
+test test_cpp_inheritance_codegen ... Inheritance test passed.
+ok
+test test_cpp_mode_and_backend_from_str_loose ... ok
+test test_cpp_modules_compilation ... ok
+test test_cpp_recursive_cycle_unique_ptr ... Recursive tree unique_ptr passed.
+ok
+test test_cpp_sanitization ... ok
+test test_cpp_struct_and_enum_codegen_compilation ... All C++20 tests passed successfully.
+ok
+
+test result: ok. 14 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 2.99s
+
+     Running tests/test_csharp_codegen.rs (target/debug/deps/test_csharp_codegen-cf32febf6e7f0777)
+
+running 20 tests
+test choice_variants_avoid_record_member_names ... ok
+test element_defaults_preserve_absence_and_empty_presence ... ok
+test emits_unrestricted_simple_types_and_validates_empty_records ... ok
+test fixed_values_are_enforced_on_read_and_write ... ok
+test lexical_union_attributes_round_trip ... ok
+test nillable_enum_collection_round_trips ... ok
+test particle_wire_structure_round_trips ... ok
+test test_csharp_any_attribute_codegen ... ok
+test test_csharp_choice_polymorphic_hierarchy ...   Determining projects to restore...
+  Restored /tmp/.tmpcrWJCG/PaymentsApp.csproj (in 170 ms).
+  PaymentsApp -> /tmp/.tmpcrWJCG/bin/Debug/net8.0/PaymentsApp.dll
+
+Build succeeded.
+    0 Warning(s)
+    0 Error(s)
+
+Time Elapsed 00:00:01.02
+Choice pattern matching and XML serialization passed!
+ok
+test test_csharp_date_or_datetime_lexical_union ... ok
+test test_csharp_mutable_inheritance_roundtrip ... ok
+test test_csharp_mutable_wrappers_and_choices_without_validation ... ok
+test test_csharp_record_kind_from_str_loose ... ok
+test test_csharp_records_and_enums_generation ...   Determining projects to restore...
+  Restored /tmp/.tmpiAkLyi/CrmApp.csproj (in 172 ms).
+  CrmApp -> /tmp/.tmpiAkLyi/bin/Debug/net8.0/CrmApp.dll
+
+Build succeeded.
+    0 Warning(s)
+    0 Error(s)
+
+Time Elapsed 00:00:01.04
+Customer C# tests passed cleanly!
+ok
+test test_csharp_recursive_cycle ...   Determining projects to restore...
+  Restored /tmp/.tmpwiJqiB/TreeApp.csproj (in 174 ms).
+  TreeApp -> /tmp/.tmpwiJqiB/bin/Debug/net8.0/TreeApp.dll
+
+Build succeeded.
+    0 Warning(s)
+    0 Error(s)
+
+Time Elapsed 00:00:01.04
+Recursive tree C# tests passed cleanly!
+ok
+test test_csharp_sanitization ... ok
+test test_csharp_sequence_nested_inside_choice_codegen ... ok
+test test_csharp_simple_content_class_validator_and_unsealed_records ... ok
+test test_csharp_source_gen_context ... ok
+test unbounded_integer_xml_preserves_digits ... ok
+
+test result: ok. 20 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 53.47s
+
+     Running tests/test_enum_literal_codegen.rs (target/debug/deps/test_enum_literal_codegen-0c92c71c8d4587d6)
+
+running 1 test
+test enum_literals_compile_and_preserve_values_in_all_seven_languages ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 3.33s
+
+     Running tests/test_go_codegen.rs (target/debug/deps/test_go_codegen-005c45ed4341be87)
+
+running 25 tests
+test abstract_substitution_heads_are_rejected ... ok
+test duplicate_choice_names_reject_invalid_branch_shapes ... ok
+test imported_ordered_types_do_not_add_unused_bytes_import ... ok
+test nested_lexical_unions_compile_and_round_trip_in_go ... ok
+test ordered_particles_and_choice_branches_round_trip ... ok
+test referenced_element_uses_declared_type_after_includes ... ok
+test repeated_choice_branch_rejects_mixed_and_empty_selections ... ok
+test repeated_sequence_groups_enforce_bounds_and_order ... ok
+test root_alias_names_are_unique_after_go_normalization ... ok
+test roots_and_union_attributes_round_trip ... ok
+test separate_choices_enforce_each_group ... ok
+test temporal_scalars_preserve_xsd_lexical_values ... ok
+test test_go_abstract_xsi_type_dispatch ... ok
+test test_go_any_attribute_codegen ... ok
+test test_go_backend_from_str_loose ... ok
+test test_go_choice_mutual_exclusivity ... go: creating new go.mod: module payments
+go: to add module requirements and sums:
+	go mod tidy
+=== RUN   TestChoiceMutualExclusivity
+    payments_test.go:44: Correctly rejected concurrent choice branches: choice ContactChoice mutual exclusivity violation: multiple branches populated (2)
+--- PASS: TestChoiceMutualExclusivity (0.00s)
+PASS
+ok  	payments	0.002s
+ok
+test test_go_date_or_datetime_lexical_union ... ok
+test test_go_easyjson_backend ... ok
+test test_go_enum_only_schema_omits_unused_xml_import ... ok
+test test_go_namespaced_element_ref_matching ... ok
+test test_go_recursive_cycle_pointers ... go: creating new go.mod: module tree
+go: to add module requirements and sums:
+	go mod tidy
+=== RUN   TestRecursiveTree
+--- PASS: TestRecursiveTree (0.00s)
+PASS
+ok  	tree	0.002s
+ok
+test test_go_sanitization ... ok
+test test_go_sonic_backend ... ok
+test test_go_struct_and_enum_generation ... go: creating new go.mod: module crm
+go: to add module requirements and sums:
+	go mod tidy
+=== RUN   TestCustomerRoundtrip
+--- PASS: TestCustomerRoundtrip (0.00s)
+PASS
+ok  	crm	0.002s
+ok
+test unbounded_integer_xml_preserves_digits ... ok
+
+test result: ok. 25 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 2.66s
+
+     Running tests/test_java_codegen.rs (target/debug/deps/test_java_codegen-a6078e165fc64681)
+
+running 17 tests
+test jackson3_preserves_core_annotations_and_maps_record_text ... ok
+test test_direct_codec_rejects_wildcards_and_name_collisions ... ok
+test test_java_bean_validation_annotations_are_opt_in ... ok
+test test_java_direct_nil_lists_choices_and_namespaces ... ok
+test test_java_identifier_sanitization ... ok
+test test_java_jackson_backend_enum_annotations ... ok
+test test_java_jackson_backend_from_str_loose ... ok
+test test_java_jackson_backend_simple_type_annotations ... ok
+test test_java_jackson_backend_struct_annotations ... ok
+test test_java_jackson_backend_union_annotations ... ok
+test test_java_module_container_class ... ok
+test test_java_mutable_builders_and_direct_codecs_execute ... ok
+test test_java_plain_record_extension_javac_execute ... ok
+test test_java_plain_record_inlines_base_fields ... ok
+test test_java_record_builder_and_nested_codec_execute ... ok
+test test_java_records_and_enums_generation ... ok
+test test_java_sealed_interface_choice ... ok
+
+test result: ok. 17 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 4.97s
+
+     Running tests/test_json.rs (target/debug/deps/test_json-74440efee0e911e7)
+
+running 4 tests
+test test_json_nested_objects_and_lists ... ok
+test test_json_primitives_and_alias_modes ... ok
+test test_json_scalar_coercion ... ok
+test test_polyvalue_direct_json_methods ... ok
+
+test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_lexical_lists.rs (target/debug/deps/test_lexical_lists-0f6750d9c4bf9a3c)
+
+running 2 tests
+test named_list_items_enforce_facets_and_enumerations ... ok
+test typed_lexical_lists_round_trip_across_codecs ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 4.84s
+
+     Running tests/test_lexical_union_codegen.rs (target/debug/deps/test_lexical_union_codegen-3c208893561d2732)
+
+running 2 tests
+test lexical_union_xml_selects_first_valid_member_and_round_trips ... ok
+test lexical_unions_are_typed_in_all_targets ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
+
+     Running tests/test_mixed_content.rs (target/debug/deps/test_mixed_content-1a697ad935ae2797)
+
+running 5 tests
+test generated_models_keep_typed_content_items_in_all_targets ... ok
+test mixed_content_preserves_nested_child_order ... ok
+test mixed_content_preserves_text_and_child_order ... ok
+test mixed_items_field_avoids_existing_attribute_name ... ok
+test parser_builds_ordered_mixed_content_union ... ok
+
+test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_pattern_codegen.rs (target/debug/deps/test_pattern_codegen-5eee5f9fe2ed3d1a)
+
+running 9 tests
+test generated_cpp_pattern_validation ... ok
+test generated_csharp_pattern_validation ... ok
+test generated_go_pattern_validation_and_xml_roundtrip ... ok
+test generated_java_pattern_validation_and_direct_codecs ... ok
+test generated_python_pattern_validation ... ok
+test generated_rust_pattern_validation_and_xml_roundtrip ... ok
+test generated_typescript_pattern_validation_all_backends ... ok
+test gregorian_primitives_emit_validated_types_across_targets ... ok
+test pattern_restrictions_preserve_or_groups_and_inherited_and_steps ... ok
+
+test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 6.12s
+
+     Running tests/test_python_codegen.rs (target/debug/deps/test_python_codegen-cc734e908fb39fb6)
+
+running 16 tests
+test multiline_xsd_documentation_stays_inside_python_comments ... ok
+test quoted_docstrings_preserve_text_and_remain_valid_python ... ok
+test test_identifier_sanitization ... ok
+test test_python_abstract_meta_emission ... ok
+test test_python_any_attribute_codegen ... ok
+test test_python_any_element_codegen ... ok
+test test_python_aot_codegen ... ok
+test test_python_choice_union_codegen ... ok
+test test_python_codecs_generation ... ok
+test test_python_dataclass_codegen ... ok
+test test_python_derived_meta_inheritance ... ok
+test test_python_generated_tag_and_custom_header ... ok
+test test_python_pydantic_codegen_with_facets ... ok
+test test_python_recursive_type_codegen ... ok
+test test_python_sequence_nested_inside_choice_codegen ... ok
+test test_python_simplecontent_default_factory ... ok
+
+test result: ok. 16 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.06s
+
+     Running tests/test_qualified_attributes.rs (target/debug/deps/test_qualified_attributes-f8397a31cf1ecf15)
+
+running 5 tests
+test derived_validators_preserve_base_constraints ... ok
+test global_attribute_references_round_trip_by_namespace ... ok
+test imported_inline_global_attribute_enum_round_trips ... ok
+test inherited_attribute_and_distinct_element_keep_separate_property_names ... ok
+test lexical_dependencies_compile_and_round_trip_without_implicit_imports ... ok
+
+test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 26.01s
+
+     Running tests/test_runtime_fast_paths.rs (target/debug/deps/test_runtime_fast_paths-7bf9091b7252b7db)
+
+running 6 tests
+test cached_patterns_keep_raw_restriction_and_trimmed_pattern_semantics ... ok
+test indexed_scalar_state_preserves_enum_pattern_and_split_text ... ok
+test lexical_list_formatting_preserves_escaping_empty_lists_and_long_numbers ... ok
+test repeated_lexical_lists_keep_whitespace_validation ... ok
+test repeated_nested_records_validate_their_own_lexical_lists ... ok
+test unified_scalar_state_keeps_mixed_branch_order_nil_and_nested_frames ... ok
+
+test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_rust_codecs.rs (target/debug/deps/test_rust_codecs-9692e165bd5e14bf)
+
+running 4 tests
+test test_empty_element_codec ... ok
+test test_facet_validation_min_max_length ... ok
+test test_order_choice_roundtrip ... ok
+test test_recursive_boxing_roundtrip ... ok
+
+test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_rust_codegen.rs (target/debug/deps/test_rust_codegen-8bce8b4b67c7eca3)
+
+running 26 tests
+test binary_lexical_values_compile_and_round_trip_in_owned_and_borrowed_modes ... ok
+test duplicate_wire_names_keep_distinct_json_values ... ok
+test empty_modules_compile_without_unused_reexports ... ok
+test multiline_docs_and_raw_field_names_are_valid_source ... ok
+test named_choice_wrappers_round_trip_without_unreachable_dispatch ... ok
+test test_rust_attribute_codec_loop_syntax ... ok
+test test_rust_choice_union_codegen ... ok
+test test_rust_codecs_codegen ... ok
+test test_rust_digit_prefixed_module_sanitization ... ok
+test test_rust_enum_and_methods ... ok
+test test_rust_extension_base_cycle_cut ... ok
+test test_rust_extension_codecs_decode_and_encode_base_fields ... ok
+test test_rust_extension_inlines_base_fields ... ok
+test test_rust_identifier_sanitization ... ok
+test test_rust_owned_codegen ... ok
+test test_rust_phf_dispatch_emission ... ok
+test test_rust_phf_dispatch_union_groups_branch_tags ... ok
+test test_rust_phf_dispatch_uniquifies_like_field_metas ... ok
+test test_rust_read_element_text_accumulates_refs_and_cdata ... ok
+test test_rust_recursive_cycle_boxing ... ok
+test test_rust_rkyv_derives ... ok
+test test_rust_simple_content_extension_shadow_rule ... ok
+test test_rust_simple_content_text_codec ... ok
+test test_rust_simple_type_cycle_resilience ... ok
+test test_rust_topological_scc_chunking ... ok
+test test_rust_zero_copy_codegen ... ok
+
+test result: ok. 26 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 16.72s
+
+     Running tests/test_schema_attribute_entities.rs (target/debug/deps/test_schema_attribute_entities-ce76904e09cb1816)
+
+running 4 tests
+test attribute_entities_reach_enum_facets_and_defaults_in_value_space ... ok
+test literal_attribute_whitespace_is_normalized_but_character_references_survive ... ok
+test malformed_attributes_and_undefined_entities_are_errors_even_in_skipped_content ... ok
+test namespace_and_qname_attributes_are_normalized_consistently ... ok
+
+test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_schema_audit.rs (target/debug/deps/test_schema_audit-24992dfb5b4a626c)
+
+running 13 tests
+test all_languages_disambiguate_flat_collision ... ok
+test chameleon_include_adopts_including_namespace_per_includer ... ok
+test derived_simple_type_inherits_base_patterns ... ok
+test diamond_includes_do_not_duplicate_upa_source_documents ... ok
+test distinct_values_with_colliding_variant_names_stay_unique ... ok
+test duplicate_enumeration_values_are_deduped ... ok
+test generated_rust_has_no_deny_unknown_fields ... ok
+test named_group_reference_fields_are_parsed ... ok
+test nested_inline_complex_type_is_extracted_not_leaked ... ok
+test quick_xml_serde_skips_unknown_elements ... ok
+test restricted_simple_types_emit_named_aliases ... ok
+test rust_flat_output_has_no_colliding_type_names ... ok
+test simple_content_extension_emits_value_field ... ok
+
+test result: ok. 13 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
+
+     Running tests/test_schema_ir.rs (target/debug/deps/test_schema_ir-f793c1b9895343c7)
+
+running 20 tests
+test consumed_child_subtrees_do_not_swallow_following_types ... ok
+test consumed_particles_do_not_swallow_following_declarations ... ok
+test derived_complex_type_keeps_base_and_bounded_choice ... ok
+test global_attribute_reference_uses_declared_type ... ok
+test imported_inline_global_attribute_types_are_resolved ... ok
+test inline_list_item_types_preserve_enum_and_union_declarations ... ok
+test missing_included_schema_is_an_error ... ok
+test schema_errors_preserve_forward_imports_and_annotation_payloads ... ok
+test schema_for_schemas_declared_types_are_not_unknown_builtins ... ok
+test test_language_context_adapter ... ok
+test test_list_fields_do_not_trigger_spurious_cycles ... ok
+test test_minijinja_template_engine_and_filters ... ok
+test test_parse_choice_as_union ... ok
+test test_parse_complex_type_and_facets ... ok
+test test_parse_lexical_union_member_types_and_inline_members ... ok
+test test_sequence_nested_inside_choice_preserved_in_ir ... ok
+test test_substitution_groups ... ok
+test test_tarjan_mutual_recursive_cycle_detection_and_boxing ... ok
+test test_tarjan_self_recursive_cycle_detection_and_boxing ... ok
+test xml_prefix_is_available_without_explicit_declaration ... ok
+
+test result: ok. 20 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
+
+     Running tests/test_security.rs (target/debug/deps/test_security-c3afa670f1d6c619)
+
+running 6 tests
+test test_cdata_section_handling ... ok
+test test_malformed_unclosed_cdata_rejection ... ok
+test test_max_depth_recursion_limit ... ok
+test test_numeric_character_references ... ok
+test test_xml_entity_roundtrip_escaping ... ok
+test unsupported_general_entities_are_rejected ... ok
+
+test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_temporal_union.rs (target/debug/deps/test_temporal_union-e25d1f9b83e2fdc4)
+
+running 2 tests
+test csharp_temporal_union_preserves_branches_and_lexicals ... ok
+test go_temporal_union_preserves_branches_and_lexicals ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 3.23s
+
+     Running tests/test_transcoder.rs (target/debug/deps/test_transcoder-6854114408316a2e)
+
+running 6 tests
+test test_schema_directed_transcoding ... ok
+test test_schema_from_ir_transcoding ... ok
+test test_schemaless_preserves_refs_cdata_and_attr_entities ... ok
+test test_schemaless_pretty_transcoding ... ok
+test test_schemaless_xml_to_json_and_back ... ok
+test test_transcoder_errors ... ok
+
+test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_ts_codegen.rs (target/debug/deps/test_ts_codegen-4e67290c9758f4d9)
+
+running 9 tests
+test mixed_content_inheritance_compiles_with_widened_items ... ok
+test test_ts_backend_from_str_loose ... ok
+test test_ts_discriminated_union_choice ... ok
+test test_ts_identifier_sanitization ... ok
+test test_ts_interface_and_enum_codegen ... ok
+test test_ts_recursive_cycle_zod_lazy ... ok
+test test_ts_typebox_schema_generation ... ok
+test test_ts_valibot_schema_generation ... ok
+test test_ts_zod_schema_generation ... ok
+
+test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.32s
+
+     Running tests/test_ubl_csharp.rs (target/debug/deps/test_ubl_csharp-b04bc8d2d5f891c2)
+
+running 2 tests
+test multi_namespace_roots_and_inherited_simple_content_compile_and_round_trip ... ok
+test unprefixed_xsd_builtin_simple_content_base_uses_default_namespace ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 3.06s
+
+     Running tests/test_unbounded_choice.rs (target/debug/deps/test_unbounded_choice-7672e62aa5ecca1a)
+
+running 1 test
+test test_unbounded_choice_ir_and_all_targets ... go: creating new go.mod: module testmod
+go: to add module requirements and sums:
+	go mod tidy
+=== RUN   TestUnboundedChoiceOrder
+--- PASS: TestUnboundedChoiceOrder (0.00s)
+PASS
+ok  	testmod	0.002s
+ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.15s
+
+     Running tests/test_upa.rs (target/debug/deps/test_upa-a20019d257c7eac5)
+
+running 6 tests
+test all_groups_and_wildcard_namespaces_are_checked ... ok
+test imported_groups_and_chameleon_wildcards_keep_source_namespaces ... ok
+test local_form_and_in_scope_qnames_distinguish_namespaces ... ok
+test model_groups_derivation_and_substitution_members_are_checked ... ok
+test occurrence_ranges_keep_particle_identity_and_count_boundaries ... ok
+test optional_siblings_and_choice_lookahead_violate_upa ... ok
+
+test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
+
+     Running tests/test_value_constraints.rs (target/debug/deps/test_value_constraints-73eb81a96de588c1)
+
+running 2 tests
+test fixed_constraints_cover_input_and_output_in_value_space ... ok
+test repeated_particle_cardinality_belongs_to_the_group ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_xsi_type.rs (target/debug/deps/test_xsi_type-2c07a0776bd0ec60)
+
+running 11 tests
+test abstract_type_requires_concrete_selector ... ok
+test abstract_type_without_derivations_errors ... ok
+test from_ir_flattens_base_fields_and_registers_variants ... ok
+test iterparse_dispatches_each_streamed_item ... ok
+test nested_xsi_type_dispatch_and_round_trip ... ok
+test nil_abstract_complex_type_skips_concrete_dispatch ... ok
+test plain_type_attribute_is_not_mistaken_for_dispatch ... ok
+test root_xsi_type_dispatch_including_empty_element ... ok
+test unknown_xsi_type_on_abstract_type_errors ... ok
+test variant_serialization_requires_namespaces ... ok
+test xsi_type_resolves_namespace_inherited_from_parent ... ok
+
+test result: ok. 11 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
+
+     Running unittests src/lib.rs (target/debug/deps/polyxml-4ccc220bbd6a27a0)
+
+running 2 tests
+test tests::test_c_abi_namespaced_roundtrip ... ok
+test tests::test_c_abi_nested_list_batch_roundtrip ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running unittests src/lib.rs (target/debug/deps/polyxml_cli-dabf613ae4318f1b)
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running unittests src/main.rs (target/debug/deps/polyxml-cec02944de7101b9)
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_cli.rs (target/debug/deps/test_cli-714ccf0c30d96734)
+
+running 47 tests
+test bash_completion_filters_values_in_the_shell ... ok
+test completion_candidates_follow_target_validation ... ok
+test fish_completion_filters_values_when_available ... ok
+test imported_substitution_helpers_do_not_require_spurious_module_owners ... ok
+test invalid_schema_grammar_and_types_fail_before_generation ... ok
+test jackson3_cli_and_manifest_emit_equivalent_models ... ok
+test manifest_generation_does_not_ignore_cli_overrides ... ok
+test python_features_respect_manifest_false_values_and_backend ... ok
+test retained_imported_ordered_helpers_belong_to_the_unique_namespace_module ... ok
+test test_cli_build_polyxml_manifest_with_new_features ... Loading manifest: /tmp/.tmpNmzZh9/polyxml.toml
+Compiling schema: /tmp/.tmpNmzZh9/model.xsd
+  Namespace: urn:app
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Emitting target [csharp] into /tmp/.tmpNmzZh9/cs
+Emitting target [ts] into /tmp/.tmpNmzZh9/ts
+Emitting target [go] into /tmp/.tmpNmzZh9/go
+Emitting target [rust] into /tmp/.tmpNmzZh9/rs
+Build finished successfully.
+ok
+test test_cli_cpp_generation ... E2E C++20 driver passed!
+ok
+test test_cli_cpp_modules_and_glaze ... ok
+test test_cli_csharp_generation ...   Determining projects to restore...
+  Restored /tmp/.tmpYbz9SE/cli_csharp_app/CrmCliApp.csproj (in 174 ms).
+  CrmCliApp -> /tmp/.tmpYbz9SE/cli_csharp_app/bin/Debug/net8.0/CrmCliApp.dll
+
+Build succeeded.
+    0 Warning(s)
+    0 Error(s)
+
+Time Elapsed 00:00:01.02
+E2E C# CLI test passed successfully!
+ok
+test test_cli_csharp_source_gen_and_record_struct ... Parsing schema: /tmp/.tmpbHmxh9/customer.xsd
+  Namespace: urn:crm
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+ok
+test test_cli_generate_custom_header_and_generated_tags ... ok
+test test_cli_generate_dry_run ... ok
+test test_cli_generate_help ... ok
+test test_cli_generate_multi_lang ... ok
+test test_cli_generate_python_backends ... ok
+test test_cli_generate_rust_zero_copy_and_owned ... ok
+test test_cli_go_easyjson_and_sonic_backend ... Parsing schema: /tmp/.tmpY1inX1/service.xsd
+  Namespace: urn:service
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+Parsing schema: /tmp/.tmpY1inX1/service.xsd
+  Namespace: urn:service
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+ok
+test test_cli_go_generation ... go: creating new go.mod: module crm
+go: to add module requirements and sums:
+	go mod tidy
+=== RUN   TestAccountE2E
+--- PASS: TestAccountE2E (0.00s)
+PASS
+ok  	crm	0.002s
+ok
+test test_cli_help ... ok
+test test_cli_java_generation ... ok
+test test_cli_manifest_custom_header_workspace_and_target_override ... Loading manifest: /tmp/.tmpCL7asY/polyxml.toml
+Compiling schema: /tmp/.tmpCL7asY/schema.xsd
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Emitting target [rust] into /tmp/.tmpCL7asY/rs
+Emitting target [go] into /tmp/.tmpCL7asY/go
+Emitting target [csharp] into /tmp/.tmpCL7asY/cs
+Build finished successfully.
+ok
+test test_cli_multiple_root_element_selection ... ok
+test test_cli_python_aot_generation ... ok
+test test_cli_python_aot_rejects_dataclass_style_and_slots ... ok
+test test_cli_root_element_selection ... ok
+test test_cli_rust_phf_feature ... Parsing schema: /tmp/.tmpwtg43i/event.xsd
+  Namespace: urn:events
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+ok
+test test_cli_rust_rkyv_feature ... Parsing schema: /tmp/.tmpUvk52O/event.xsd
+  Namespace: urn:events
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+ok
+test test_cli_rust_split_units_and_chunking ... ok
+test test_cli_shared_modules_deduplication ... ok
+test test_cli_transcode_bidirectional ... ok
+test test_cli_typescript_generation ... ok
+test test_cli_typescript_valibot_and_typebox_backend ... Parsing schema: /tmp/.tmpAMQOnu/item.xsd
+  Namespace: urn:store
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+Parsing schema: /tmp/.tmpAMQOnu/item.xsd
+  Namespace: urn:store
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+ok
+test test_cli_validate_valid_and_invalid ... ok
+test test_java_csharp_model_style_options_and_manifest ... ok
+test test_polyxml_toml_manifest_build ... ok
+test test_root_selection_keeps_imported_module_types ... ok
+test unified_help_shows_generation_options ... ok
+test unified_manifest_forms_generate_identical_output_and_validate_early ... ok
+test unified_options_fail_before_schema_io_including_dry_run ... ok
+test unified_supported_backends_and_styles_validate ... ok
+test unsupported_xsd_alternatives_fail_explicitly ... ok
+test validate_and_generate_reject_upa_violations ... ok
+test zsh_completion_filters_values_when_available ... ok
+
+test result: ok. 47 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 18.30s
+
+     Running unittests src/lib.rs (target/debug/deps/polyxml_js-878a75d7b7901cc9)
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running unittests src/lib.rs (target/debug/deps/_polyxml-a668b0910babaf29)
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running unittests src/lib.rs (target/debug/deps/polyxml_wasm-d510c7f48918b595)
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+   Doc-tests polyxml
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+   Doc-tests polyxml_cli
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+   Doc-tests polyxml_wasm
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+==> [4/6] Compiling Python PyO3 extension (maturin develop)...
+🍹 Building a mixed python/rust project
+🐍 Found CPython 3.14 at /home/bailey/github/PolyXML/.venv/bin/python
+🔗 Found pyo3 bindings with abi3-py3.12 support
+📡 Using build options features from pyproject.toml
+Using Python 3.14.4 environment at: /home/bailey/github/PolyXML/.venv
+Checked 6 packages in 0.53ms
+   Compiling pyo3-ffi v0.29.2
+   Compiling pyo3 v0.29.2
+   Compiling polyxml v0.34.6 (/home/bailey/github/polyxml-xsd-attributes/crates/polyxml-core)
+   Compiling polyxml-python v0.34.6 (/home/bailey/github/polyxml-xsd-attributes/crates/polyxml-python)
+    Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.22s
+📦 Built wheel for abi3 Python ≥ 3.12 to /tmp/.tmpIFoofC/polyxml-0.34.6-cp312-abi3-linux_x86_64.whl
+✏️ Setting installed package as editable
+🛠 Installed polyxml-0.34.6
+==> [5/6] Running Python Ruff checks...
+All checks passed!
+10 files already formatted
+==> [6/6] Running Python tests with 100% statement & branch coverage...
+........................................................................ [ 64%]
+........................................                                 [100%]
+================================ tests coverage ================================
+_______________ coverage: platform linux, python 3.14.4-final-0 ________________
+
+Name    Stmts   Miss Branch BrPart  Cover   Missing
+---------------------------------------------------
+TOTAL     181      0     58      0   100%
+
+3 files skipped due to complete coverage.
+Required test coverage of 100% reached. Total coverage: 100.00%
+112 passed in 0.55s
+✨ All PolyXML dual-language quality gates passed!
diff --git a/research/data/runtime-followups-2026-10-03/entities/rejected-shared-target-preflight/AttrDecl.txt b/research/data/runtime-followups-2026-10-03/entities/rejected-shared-target-preflight/AttrDecl.txt
new file mode 100644
index 0000000..58d8c54
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/rejected-shared-target-preflight/AttrDecl.txt
@@ -0,0 +1,23 @@
+memcap: <=7759 MiB (60% of 12933 MiB available) [systemd MemoryMax, swap off]
+╭─────────────────────────────────────────────────────────────╮
+│ PolyXML W3C XML Schema Conformance Suite                    │
+│ Compiler Binary: /tmp/polyxml-followup-baseline-bin/polyxml │
+│ W3C Submodule: /home/bailey/github/polyxml-w3c-tests/w3c    │
+│ Selected Suite: AttrDecl                                    │
+╰─────────────────────────────────────────────────────────────╯
+Executing 50 test group(s)...
+
+  Testing AttrDecl/ad_name00108m5... ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 100% 0:00:00
+
+       W3C XML Schema Conformance Summary        
+┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━┳━━━━━━━━┓
+┃ Category                     ┃ Count ┃   Rate ┃
+┡━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━╇━━━━━━━━┩
+│ Total Test Groups            │    50 │ 100.0% │
+│ Schema Compilations Passed   │    50 │ 100.0% │
+│ Schema Compilations Failed   │     0 │   0.0% │
+│ Valid Instances Evaluated    │    50 │      - │
+│ Roundtrip Validations Passed │    50 │ 100.0% │
+└──────────────────────────────┴───────┴────────┘
+
+All executed tests passed with 100% compliance!
diff --git a/research/data/runtime-followups-2026-10-03/entities/rejected-shared-target-preflight/CType.txt b/research/data/runtime-followups-2026-10-03/entities/rejected-shared-target-preflight/CType.txt
new file mode 100644
index 0000000..0884ed9
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/rejected-shared-target-preflight/CType.txt
@@ -0,0 +1,53 @@
+memcap: <=7745 MiB (60% of 12909 MiB available) [systemd MemoryMax, swap off]
+╭─────────────────────────────────────────────────────────────╮
+│ PolyXML W3C XML Schema Conformance Suite                    │
+│ Compiler Binary: /tmp/polyxml-followup-baseline-bin/polyxml │
+│ W3C Submodule: /home/bailey/github/polyxml-w3c-tests/w3c    │
+│ Selected Suite: CType                                       │
+╰─────────────────────────────────────────────────────────────╯
+Executing 31 test group(s)...
+
+  Testing CType/targetns00101m... ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 100% 0:00:00
+
+       W3C XML Schema Conformance Summary        
+┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━┳━━━━━━━━┓
+┃ Category                     ┃ Count ┃   Rate ┃
+┡━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━╇━━━━━━━━┩
+│ Total Test Groups            │    31 │ 100.0% │
+│ Schema Compilations Passed   │    31 │ 100.0% │
+│ Schema Compilations Failed   │     0 │   0.0% │
+│ Valid Instances Evaluated    │    28 │      - │
+│ Roundtrip Validations Passed │    23 │  82.1% │
+└──────────────────────────────┴───────┴────────┘
+
+Failures & Exceptions (5 groups):
+┏━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━┓
+┃                    ┃               ┃     Instances      ┃ Error / First      ┃
+┃ Suite/Group        ┃ Schema Status ┃    (Pass/Total)    ┃ Failure            ┃
+┡━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━┩
+│ CType/basetd00101… │ PASS          │        0/1         │ Positive: FAIL -   │
+│                    │               │                    │ Root.__init__()    │
+│                    │               │                    │ missing 1 required │
+│                    │               │                    │ keyword-only       │
+│                    │               │                    │ argument: 'valu    │
+│ CType/basetd00101… │ PASS          │        0/1         │ Positive: FAIL -   │
+│                    │               │                    │ Root.__init__()    │
+│                    │               │                    │ missing 1 required │
+│                    │               │                    │ keyword-only       │
+│                    │               │                    │ argument: 'valu    │
+│ CType/derivationm… │ PASS          │        0/1         │ Positive: FAIL -   │
+│                    │               │                    │ B.__init__()       │
+│                    │               │                    │ missing 1 required │
+│                    │               │                    │ keyword-only       │
+│                    │               │                    │ argument: 'value'  │
+│ CType/psubstituti… │ PASS          │        1/2         │ pSubstitutions001… │
+│                    │               │                    │ FAIL - Schema      │
+│                    │               │                    │ error: Unexpected  │
+│                    │               │                    │ root element       │
+│                    │               │                    │ {pSubstitu         │
+│ CType/psubstituti… │ PASS          │        1/2         │ pSubstitutions001… │
+│                    │               │                    │ FAIL - Schema      │
+│                    │               │                    │ error: Unexpected  │
+│                    │               │                    │ root element       │
+│                    │               │                    │ {pSubstitu         │
+└────────────────────┴───────────────┴────────────────────┴────────────────────┘
diff --git a/research/data/runtime-followups-2026-10-03/entities/rejected-shared-target-preflight/NIST.txt b/research/data/runtime-followups-2026-10-03/entities/rejected-shared-target-preflight/NIST.txt
new file mode 100644
index 0000000..3b1d98d
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/rejected-shared-target-preflight/NIST.txt
@@ -0,0 +1,32 @@
+memcap: <=7758 MiB (60% of 12931 MiB available) [systemd MemoryMax, swap off]
+╭─────────────────────────────────────────────────────────────╮
+│ PolyXML W3C XML Schema Conformance Suite                    │
+│ Compiler Binary: /tmp/polyxml-followup-baseline-bin/polyxml │
+│ W3C Submodule: /home/bailey/github/polyxml-w3c-tests/w3c    │
+│ Selected Suite: NISTXMLSchemaDatatypes                      │
+╰─────────────────────────────────────────────────────────────╯
+Executing 100 test group(s)...
+
+  Testing NIST2004-01-14/atomic-nonPositiveInteger-totalDigits... ━━━━ 100% 0:0…
+
+       W3C XML Schema Conformance Summary        
+┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━┳━━━━━━━━┓
+┃ Category                     ┃ Count ┃   Rate ┃
+┡━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━╇━━━━━━━━┩
+│ Total Test Groups            │   100 │ 100.0% │
+│ Schema Compilations Passed   │   100 │ 100.0% │
+│ Schema Compilations Failed   │     0 │   0.0% │
+│ Valid Instances Evaluated    │   452 │      - │
+│ Roundtrip Validations Passed │   447 │  98.9% │
+└──────────────────────────────┴───────┴────────┘
+
+Failures & Exceptions (1 groups):
+┏━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━┓
+┃                    ┃               ┃     Instances      ┃ Error / First      ┃
+┃ Suite/Group        ┃ Schema Status ┃    (Pass/Total)    ┃ Failure            ┃
+┡━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━┩
+│ NIST2004-01-14/at… │ PASS          │        0/5         │ NISTXML-SV-IV-ato… │
+│                    │               │                    │ FAIL - Scalar      │
+│                    │               │                    │ parse error for    │
+│                    │               │                    │ field 'v           │
+└────────────────────┴───────────────┴────────────────────┴────────────────────┘
diff --git a/research/data/runtime-followups-2026-10-03/entities/rejected-shared-target-preflight/README.txt b/research/data/runtime-followups-2026-10-03/entities/rejected-shared-target-preflight/README.txt
new file mode 100644
index 0000000..12cc48c
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/rejected-shared-target-preflight/README.txt
@@ -0,0 +1 @@
+EXCLUDED: the purported baseline CLI emitted decoded R&D and unescaped quote literals, identifying an intermediate entity-fix binary rather than baseline 1819c91. Cargo reported fresh artifacts in the shared debug target. Corpus results from this preflight are not valid revision comparisons. Rebuild CLI and native binding in distinct revision-owned target directories, then probe both before comparing.
diff --git a/research/data/runtime-followups-2026-10-03/entities/rejected-shared-target-preflight/binding.txt b/research/data/runtime-followups-2026-10-03/entities/rejected-shared-target-preflight/binding.txt
new file mode 100644
index 0000000..a9756cd
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/rejected-shared-target-preflight/binding.txt
@@ -0,0 +1,10 @@
+memcap: <=7789 MiB (60% of 12983 MiB available) [systemd MemoryMax, swap off]
+🍹 Building a mixed python/rust project
+🐍 Found CPython 3.14 at /home/bailey/github/polyxml-w3c-tests/.venv/bin/python
+🔗 Found pyo3 bindings with abi3-py3.12 support
+📡 Using build options features from pyproject.toml
+Checked 6 packages in 0.46ms
+    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.03s
+📦 Built wheel for abi3 Python ≥ 3.12 to /tmp/.tmp6IeP7T/polyxml-0.34.6-cp312-abi3-linux_x86_64.whl
+✏️ Setting installed package as editable
+🛠 Installed polyxml-0.34.6
diff --git a/research/data/runtime-followups-2026-10-03/entities/rejected-shared-target-preflight/cli-build.txt b/research/data/runtime-followups-2026-10-03/entities/rejected-shared-target-preflight/cli-build.txt
new file mode 100644
index 0000000..e7e332c
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/rejected-shared-target-preflight/cli-build.txt
@@ -0,0 +1,2 @@
+memcap: <=7850 MiB (60% of 13084 MiB available) [systemd MemoryMax, swap off]
+    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.04s
diff --git a/research/data/runtime-followups-2026-10-03/entities/rejected-shared-target-preflight/source-probe/enum_literal_escaping.rs b/research/data/runtime-followups-2026-10-03/entities/rejected-shared-target-preflight/source-probe/enum_literal_escaping.rs
new file mode 100644
index 0000000..dd7d015
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/rejected-shared-target-preflight/source-probe/enum_literal_escaping.rs
@@ -0,0 +1,128 @@
+// @generated by PolyXML Compiler (https://github.com/polyxml/PolyXML)
+#![allow(dead_code, unused_imports, unused_mut, unused_variables, unused_assignments, non_camel_case_types, non_snake_case)]
+
+use std::borrow::Cow;
+use serde::{Deserialize, Serialize};
+use std::str::FromStr;
+use quick_xml::events::{BytesEnd, BytesStart, BytesText, Event};
+use quick_xml::{Reader, Writer};
+use polyxml::{PolyXmlError, Result};
+
+#[allow(dead_code)]
+pub(crate) fn skip_xml_element(reader: &mut Reader<&[u8]>) -> Result<()> {
+    let mut depth = 1;
+    loop {
+        match reader.read_event()? {
+            Event::Start(_) => depth += 1,
+            Event::End(_) => {
+                depth -= 1;
+                if depth == 0 {
+                    break;
+                }
+            }
+            Event::Eof => break,
+            _ => {}
+        }
+    }
+    Ok(())
+}
+
+#[allow(dead_code)]
+pub(crate) fn read_element_text<'a>(reader: &mut Reader<&'a [u8]>, tag_name: &str) -> Result<Cow<'a, str>> {
+    let mut text = Cow::Borrowed("");
+    loop {
+        match reader.read_event()? {
+            Event::Text(t) => {
+                let raw = match t.into_inner() {
+                    Cow::Borrowed(b) => match quick_xml::escape::unescape(b)? {
+                        Cow::Borrowed(s) => Cow::Borrowed(s),
+                        Cow::Owned(s) => Cow::Owned(s),
+                    },
+                    Cow::Owned(s) => Cow::Owned(quick_xml::escape::unescape(&s)?.into_owned()),
+                };
+                if text.is_empty() {
+                    text = raw;
+                } else {
+                    text.to_mut().push_str(&raw);
+                }
+            }
+            Event::CData(c) => {
+                text.to_mut().push_str(c.as_ref());
+            }
+            Event::GeneralRef(r) => {
+                if r.is_char_ref() {
+                    if let Some(ch) = r.resolve_char_ref()? {
+                        text.to_mut().push(ch);
+                    }
+                } else if let Some(val) = quick_xml::escape::resolve_xml_entity(r.as_ref()) {
+                    text.to_mut().push_str(val);
+                } else {
+                    text.to_mut().push_str(r.as_ref());
+                }
+            }
+            Event::End(e) if e.local_name().as_ref() == tag_name => break,
+            Event::Eof => break,
+            _ => {}
+        }
+    }
+    Ok(text)
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Default, Serialize, Deserialize)]
+pub enum Status {
+    #[serde(rename = "R&D")]
+    #[default]
+    Rd,
+    #[serde(rename = ""quoted" 'value' <tag>")]
+    QuotedValueTag,
+    #[serde(rename = "café 😀")]
+    Café,
+    #[serde(rename = "literal &amp;")]
+    LiteralAmp,
+    #[serde(rename = "slash\path\u000a")]
+    SlashPathU000a,
+    #[serde(rename = "tab	line
+carriage
tail")]
+    TabLineCarriageTail,
+    #[serde(rename = "…next
line")]
+    NextLine,
+}
+
+impl Status {
+    pub fn as_str(&self) -> &'static str {
+        match self {
+            Self::Rd => "R&D",
+            Self::QuotedValueTag => ""quoted" 'value' <tag>",
+            Self::Café => "café 😀",
+            Self::LiteralAmp => "literal &amp;",
+            Self::SlashPathU000a => "slash\path\u000a",
+            Self::TabLineCarriageTail => "tab	line
+carriage
tail",
+            Self::NextLine => "…next
line",
+        }
+    }
+}
+
+impl std::str::FromStr for Status {
+    type Err = String;
+
+    fn from_str(s: &str) -> std::result::Result<Self, Self::Err> {
+        match s {
+            "R&D" => Ok(Self::Rd),
+            ""quoted" 'value' <tag>" => Ok(Self::QuotedValueTag),
+            "café 😀" => Ok(Self::Café),
+            "literal &amp;" => Ok(Self::LiteralAmp),
+            "slash\path\u000a" => Ok(Self::SlashPathU000a),
+            "tab	line
+carriage
tail" => Ok(Self::TabLineCarriageTail),
+            "…next
line" => Ok(Self::NextLine),
+            _ => Err(format!("Unknown Status variant: {}", s)),
+        }
+    }
+}
+
+impl std::fmt::Display for Status {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", self.as_str())
+    }
+}
diff --git a/research/data/runtime-followups-2026-10-03/entities/rejected-shared-target-preflight/source-probe/mod.rs b/research/data/runtime-followups-2026-10-03/entities/rejected-shared-target-preflight/source-probe/mod.rs
new file mode 100644
index 0000000..cdd253c
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/rejected-shared-target-preflight/source-probe/mod.rs
@@ -0,0 +1,2 @@
+pub mod enum_literal_escaping;
+pub use enum_literal_escaping::*;
diff --git a/research/data/runtime-followups-2026-10-03/entities/seven-language-enums.txt b/research/data/runtime-followups-2026-10-03/entities/seven-language-enums.txt
new file mode 100644
index 0000000..53ac891
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/seven-language-enums.txt
@@ -0,0 +1,10 @@
+memcap: <=7761 MiB (60% of 12935 MiB available) [systemd MemoryMax, swap off]
+   Compiling polyxml v0.34.6 (/home/bailey/github/polyxml-xsd-attributes/crates/polyxml-core)
+    Finished `test` profile [unoptimized + debuginfo] target(s) in 1.08s
+     Running tests/test_enum_literal_codegen.rs (target/debug/deps/test_enum_literal_codegen-6a79ae9a974df2ca)
+
+running 1 test
+test enum_literals_compile_and_preserve_values_in_all_seven_languages ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 4.09s
+
diff --git a/research/data/runtime-followups-2026-10-03/entities/seven-target-smoke.txt b/research/data/runtime-followups-2026-10-03/entities/seven-target-smoke.txt
new file mode 100644
index 0000000..2bed8ec
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/seven-target-smoke.txt
@@ -0,0 +1,21 @@
+memcap: <=7726 MiB (60% of 12876 MiB available) [systemd MemoryMax, swap off]
+==> Building polyxml CLI binary...
+==> Testing code generation across all 7 target ecosystems...
+  • Rust (--feature zero-copy,rkyv,phf)... OK
+  • Python (dataclasses)... OK
+  • Python (pydantic-v2)... OK
+  • C++20 (headers + glaze)... OK
+  • C++20 (modules)... OK
+  • Java 22+ (standard records)... OK
+  • Java 22+ (jackson)... OK
+  • Java (POJO + builder + direct codec)... OK
+  • TypeScript (zod)... OK
+  • TypeScript (valibot)... OK
+  • TypeScript (typebox)... OK
+  • Go (standard)... OK
+  • Go (sonic)... OK
+  • Go (easyjson)... OK
+  • C# (record class)... OK
+  • C# (record struct + source-gen)... OK
+  • C# (mutable class + source-gen)... OK
+✨ Multi-target smoke verification passed completely across all 7 ecosystems!
diff --git a/research/data/runtime-followups-2026-10-03/entities/source-artifacts.json b/research/data/runtime-followups-2026-10-03/entities/source-artifacts.json
new file mode 100644
index 0000000..aba9241
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/source-artifacts.json
@@ -0,0 +1,22 @@
+{
+  "baseline": {
+    "revision": "1819c91b0808b9242c642d82350d2b657b60108c",
+    "binary_sha256": "b16e6e65aea5615a99cef64a305ae273939a9c2a53691004775489e3ce966f5c",
+    "binding": {
+      "result": "rejected",
+      "error": "Scalar parse error for field 'status': expected enumeration, got 'R&D'",
+      "module": "/home/bailey/github/polyxml-perf-selected/crates/polyxml-python/python/polyxml/_polyxml.abi3.so",
+      "sha256": "3eb1ac4f969508274e2f0073ed35e142a9be876278add61eff1e2977b70c4eb0"
+    }
+  },
+  "candidate": {
+    "revision": "dc38fde3bcbe36261aee1ecd0e0aaf4835d730ea",
+    "binary_sha256": "6641ff2fe5e44736f8d4f338dc1dd78ed4f7f681900ee8491e1b2cf159b9c787",
+    "binding": {
+      "result": "accepted",
+      "json": "{\"Code\":\"A&B\",\"Default\":\"caf\u00e9\",\"Fixed\":\"R&D\",\"Status\":\"R&D\",\"label\":\"<label>\",\"mode\":\"R&D\"}",
+      "module": "/home/bailey/github/polyxml-xsd-attributes/crates/polyxml-python/python/polyxml/_polyxml.abi3.so",
+      "sha256": "1c68a5177253ad4f9009c9ce586124241b5c4c3ff39b11d00a191227cbfe1a2d"
+    }
+  }
+}
diff --git a/research/data/runtime-followups-2026-10-03/entities/toolchains.json b/research/data/runtime-followups-2026-10-03/entities/toolchains.json
new file mode 100644
index 0000000..153e4c9
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/toolchains.json
@@ -0,0 +1,66 @@
+{
+  "rust": {
+    "command": [
+      "rustc",
+      "-Vv"
+    ],
+    "output": "rustc 1.99.0 (b940084d7 2026-09-28)\nbinary: rustc\ncommit-hash: b940084d7eb6a299eb4bfeb8e34901bc051e7ac4\ncommit-date: 2026-09-28\nhost: x86_64-unknown-linux-gnu\nrelease: 1.99.0\nLLVM version: 23.1.1\n",
+    "exit_code": 0
+  },
+  "python": {
+    "command": [
+      "python3",
+      "--version"
+    ],
+    "output": "Python 3.14.4\n",
+    "exit_code": 0
+  },
+  "cpp": {
+    "command": [
+      "c++",
+      "--version"
+    ],
+    "output": "c++ (Ubuntu 15.2.0-16ubuntu1) 15.2.0\nCopyright (C) 2025 Free Software Foundation, Inc.\nThis is free software; see the source for copying conditions.  There is NO\nwarranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\n",
+    "exit_code": 0
+  },
+  "go": {
+    "command": [
+      "go",
+      "version"
+    ],
+    "output": "go version go1.26.0 linux/amd64\n",
+    "exit_code": 0
+  },
+  "java": {
+    "command": [
+      "javac",
+      "-version"
+    ],
+    "output": "javac 25.0.4.1\n",
+    "exit_code": 0
+  },
+  "csharp": {
+    "command": [
+      "dotnet",
+      "--list-runtimes"
+    ],
+    "output": "Microsoft.AspNetCore.App 10.0.12 [/usr/lib/dotnet/shared/Microsoft.AspNetCore.App]\nMicrosoft.NETCore.App 10.0.12 [/usr/lib/dotnet/shared/Microsoft.NETCore.App]\n",
+    "exit_code": 0
+  },
+  "node": {
+    "command": [
+      "node",
+      "--version"
+    ],
+    "output": "v24.21.0\n",
+    "exit_code": 0
+  },
+  "typescript": {
+    "command": [
+      "/tmp/polyxml-corpus-tools/node_modules/.bin/tsc",
+      "--version"
+    ],
+    "output": "Version 5.9.3\n",
+    "exit_code": 0
+  }
+}
diff --git a/research/data/runtime-followups-2026-10-03/entities/verification-metadata.json b/research/data/runtime-followups-2026-10-03/entities/verification-metadata.json
new file mode 100644
index 0000000..4a6d77a
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/entities/verification-metadata.json
@@ -0,0 +1,19 @@
+{
+  "host": "Linux-6.18.40.1-microsoft-standard-WSL2-x86_64-with-glibc2.43",
+  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)\nbinary: rustc\ncommit-hash: b940084d7eb6a299eb4bfeb8e34901bc051e7ac4\ncommit-date: 2026-09-28\nhost: x86_64-unknown-linux-gnu\nrelease: 1.99.0\nLLVM version: 23.1.1\n",
+  "python": "Python 3.14.4\n",
+  "date": "2026-10-03",
+  "memory_cap": "systemd; 60% available RAM; swap off; one Cargo worker",
+  "gates": {
+    "mixed-nil": {
+      "rust_tests": 323,
+      "python_tests": 112,
+      "python_statement_and_branch_coverage": "100%"
+    },
+    "xsd-entities": {
+      "rust_tests": 326,
+      "python_tests": 112,
+      "python_statement_and_branch_coverage": "100%"
+    }
+  }
+}
diff --git a/research/data/runtime-followups-2026-10-03/integration/AttrDecl.log b/research/data/runtime-followups-2026-10-03/integration/AttrDecl.log
new file mode 100644
index 0000000..61882a7
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/integration/AttrDecl.log
@@ -0,0 +1,23 @@
+memcap: <=7569 MiB (60% of 12616 MiB available) [systemd MemoryMax, swap off]
+╭────────────────────────────────────────────────────────────────╮
+│ PolyXML W3C XML Schema Conformance Suite                       │
+│ Compiler Binary: /tmp/polyxml-followup-integration-bin/polyxml │
+│ W3C Submodule: /home/bailey/github/polyxml-w3c-tests/w3c       │
+│ Selected Suite: AttrDecl                                       │
+╰────────────────────────────────────────────────────────────────╯
+Executing 50 test group(s)...
+
+  Testing AttrDecl/ad_name00108m5... ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 100% 0:00:00
+
+       W3C XML Schema Conformance Summary        
+┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━┳━━━━━━━━┓
+┃ Category                     ┃ Count ┃   Rate ┃
+┡━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━╇━━━━━━━━┩
+│ Total Test Groups            │    50 │ 100.0% │
+│ Schema Compilations Passed   │    50 │ 100.0% │
+│ Schema Compilations Failed   │     0 │   0.0% │
+│ Valid Instances Evaluated    │    50 │      - │
+│ Roundtrip Validations Passed │    50 │ 100.0% │
+└──────────────────────────────┴───────┴────────┘
+
+All executed tests passed with 100% compliance!
diff --git a/research/data/runtime-followups-2026-10-03/integration/CType.log b/research/data/runtime-followups-2026-10-03/integration/CType.log
new file mode 100644
index 0000000..522a276
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/integration/CType.log
@@ -0,0 +1,53 @@
+memcap: <=7584 MiB (60% of 12641 MiB available) [systemd MemoryMax, swap off]
+╭────────────────────────────────────────────────────────────────╮
+│ PolyXML W3C XML Schema Conformance Suite                       │
+│ Compiler Binary: /tmp/polyxml-followup-integration-bin/polyxml │
+│ W3C Submodule: /home/bailey/github/polyxml-w3c-tests/w3c       │
+│ Selected Suite: CType                                          │
+╰────────────────────────────────────────────────────────────────╯
+Executing 31 test group(s)...
+
+  Testing CType/targetns00101m... ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 100% 0:00:00
+
+       W3C XML Schema Conformance Summary        
+┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━┳━━━━━━━━┓
+┃ Category                     ┃ Count ┃   Rate ┃
+┡━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━╇━━━━━━━━┩
+│ Total Test Groups            │    31 │ 100.0% │
+│ Schema Compilations Passed   │    31 │ 100.0% │
+│ Schema Compilations Failed   │     0 │   0.0% │
+│ Valid Instances Evaluated    │    28 │      - │
+│ Roundtrip Validations Passed │    23 │  82.1% │
+└──────────────────────────────┴───────┴────────┘
+
+Failures & Exceptions (5 groups):
+┏━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━┓
+┃                    ┃               ┃     Instances      ┃ Error / First      ┃
+┃ Suite/Group        ┃ Schema Status ┃    (Pass/Total)    ┃ Failure            ┃
+┡━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━┩
+│ CType/basetd00101… │ PASS          │        0/1         │ Positive: FAIL -   │
+│                    │               │                    │ Root.__init__()    │
+│                    │               │                    │ missing 1 required │
+│                    │               │                    │ keyword-only       │
+│                    │               │                    │ argument: 'valu    │
+│ CType/basetd00101… │ PASS          │        0/1         │ Positive: FAIL -   │
+│                    │               │                    │ Root.__init__()    │
+│                    │               │                    │ missing 1 required │
+│                    │               │                    │ keyword-only       │
+│                    │               │                    │ argument: 'valu    │
+│ CType/derivationm… │ PASS          │        0/1         │ Positive: FAIL -   │
+│                    │               │                    │ B.__init__()       │
+│                    │               │                    │ missing 1 required │
+│                    │               │                    │ keyword-only       │
+│                    │               │                    │ argument: 'value'  │
+│ CType/psubstituti… │ PASS          │        1/2         │ pSubstitutions001… │
+│                    │               │                    │ FAIL - Schema      │
+│                    │               │                    │ error: Unexpected  │
+│                    │               │                    │ root element       │
+│                    │               │                    │ {pSubstitu         │
+│ CType/psubstituti… │ PASS          │        1/2         │ pSubstitutions001… │
+│                    │               │                    │ FAIL - Schema      │
+│                    │               │                    │ error: Unexpected  │
+│                    │               │                    │ root element       │
+│                    │               │                    │ {pSubstitu         │
+└────────────────────┴───────────────┴────────────────────┴────────────────────┘
diff --git a/research/data/runtime-followups-2026-10-03/integration/NIST.log b/research/data/runtime-followups-2026-10-03/integration/NIST.log
new file mode 100644
index 0000000..5e6216b
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/integration/NIST.log
@@ -0,0 +1,32 @@
+memcap: <=7565 MiB (60% of 12609 MiB available) [systemd MemoryMax, swap off]
+╭────────────────────────────────────────────────────────────────╮
+│ PolyXML W3C XML Schema Conformance Suite                       │
+│ Compiler Binary: /tmp/polyxml-followup-integration-bin/polyxml │
+│ W3C Submodule: /home/bailey/github/polyxml-w3c-tests/w3c       │
+│ Selected Suite: NIST                                           │
+╰────────────────────────────────────────────────────────────────╯
+Executing 100 test group(s)...
+
+  Testing NIST2004-01-14/atomic-nonPositiveInteger-totalDigits... ━━━━ 100% 0:0…
+
+       W3C XML Schema Conformance Summary        
+┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━┳━━━━━━━━┓
+┃ Category                     ┃ Count ┃   Rate ┃
+┡━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━╇━━━━━━━━┩
+│ Total Test Groups            │   100 │ 100.0% │
+│ Schema Compilations Passed   │   100 │ 100.0% │
+│ Schema Compilations Failed   │     0 │   0.0% │
+│ Valid Instances Evaluated    │   452 │      - │
+│ Roundtrip Validations Passed │   447 │  98.9% │
+└──────────────────────────────┴───────┴────────┘
+
+Failures & Exceptions (1 groups):
+┏━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━┓
+┃                    ┃               ┃     Instances      ┃ Error / First      ┃
+┃ Suite/Group        ┃ Schema Status ┃    (Pass/Total)    ┃ Failure            ┃
+┡━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━┩
+│ NIST2004-01-14/at… │ PASS          │        0/5         │ NISTXML-SV-IV-ato… │
+│                    │               │                    │ FAIL - Scalar      │
+│                    │               │                    │ parse error for    │
+│                    │               │                    │ field 'v           │
+└────────────────────┴───────────────┴────────────────────┴────────────────────┘
diff --git a/research/data/runtime-followups-2026-10-03/integration/SHA256SUMS b/research/data/runtime-followups-2026-10-03/integration/SHA256SUMS
new file mode 100644
index 0000000..f7aa77b
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/integration/SHA256SUMS
@@ -0,0 +1,41 @@
+e9d7f2353f3115a639c487445a9cc0c199e97184f1bbaa0c689ba6409cd15d9a  AttrDecl.log
+da6360ccf2ee74e317288eb69303f07d21dd8a9c7c40d488d6264dc51d9f7291  CType.log
+19e6417271d159a095e93c88c6680f4c53d188db082a310bfca8e4a068c9b2f8  NIST.log
+98b24164e3d6f2acde1aa1f9342cf494dbca57d38b77cdd091cdf4c814a701f8  archive-criterion.py.txt
+04f34a6b3d6726b5779e6af55ca63d559ddfdeb02c14afeafecccca0d7994f44  branches/baseline-0.txt
+6b250d5855aa7289a331f3771861f4bd10c58c6716573cdfd9e16aeac99a15d5  branches/baseline-1.txt
+6275e69b07291df9a8d0c182b05d4c4a71cac38fbe71fd445eb6e64646cb5d99  branches/baseline-build.txt
+a73a0247ac41e366eb762eb403780712b9132618b99e02b49fe6ded9862f65c5  branches/baseline.lock
+6bbfd7325f1dda76694d63dbd428ee2846bb2cf360bd5d53a0f48eb74c7b545e  branches/criterion-SHA256SUMS
+34a01120613e8564dec40f86790fcfd709e8bd45c7a52d47332aacf6ef54c819  branches/criterion-results.tar.gz
+ca2242aae257ce3a50b344e94a169542b4c8b7a3b8128b4ad54914c21812715d  branches/current-0.txt
+b5ade8cab5ad765fbd220b065bfb90012605c80e87a8dc172e40b1896c928958  branches/current-1.txt
+dbf8eb8a9b4e8f4eeabab70df9ac12eba3c59fa4487c38a295fb191b6ce45c05  branches/current-build.txt
+a73a0247ac41e366eb762eb403780712b9132618b99e02b49fe6ded9862f65c5  branches/current.lock
+7067c021cacb00e3c103199e251d788d69069fe7ebd286817854ae415701c3ee  branches/harness.rs
+19f29a89eb11d509bcfddf84feab47ceb680079a9b02559c6af45f5c727fc9aa  branches/metadata.json
+d5bc511519f24cf13a1732c22db506b334907138caacb2ca7b2c6cba1e9ac4a7  branches/summary.json
+670bd1431606a0ae8dec7808609d2ffa2124e321b94c7658485b270f98238e35  companion-binding.log
+b1755fd5b058e186fe4088cb6e8b3f8e6ab5112f55dd11279e96773b42a73be0  core/baseline-0.txt
+24f94dc8017a3026eb634c09fd50e1cd759425825e2e55b79950944a34f62c25  core/baseline-1.txt
+6faf2ce57bc109cfc8e3b0d219a6e3a6dfcf15de28320ff7d861e773d3f2d72e  core/baseline-2.txt
+41e3788885466a0571a48a9f71f5feb8d1619f6db7931f4065063f7a29f4574e  core/baseline-build.txt
+a73a0247ac41e366eb762eb403780712b9132618b99e02b49fe6ded9862f65c5  core/baseline.lock
+d0316ef3e19cfa1bacdc2d766bec3fc0b97d2a98c61ab4bb900585c5cb62933b  core/criterion-SHA256SUMS
+3d9d55253a4ef1015343250ca8634bcdf70be0d48d5add2464de891428551e3a  core/criterion-results.tar.gz
+2d98923bc338adfee1d599f1a0c33895fe581f0844c8339aece4fe559520e1e2  core/current-0.txt
+2ba500cd2d1c99573282b912736ee33390f4800dc1042712e15e01056ba0df1e  core/current-1.txt
+4d555b6b2909a6ab90befa0b9f77990aa2ee730fa3efde7eaf5e1a0c7c82d386  core/current-2.txt
+14448595e974ccdca916c301b62ea1622779cee67947ceb37416cfed3d22be28  core/current-build.txt
+a73a0247ac41e366eb762eb403780712b9132618b99e02b49fe6ded9862f65c5  core/current.lock
+543d6b07b2f53e0773ee0c93580197fb497083e93cc525333a822770fa5372b9  core/harness.rs
+1a3e79de1b055a5eaa58ee3343a4f5197f63c8e6a36f96835f9c279356c9e21d  core/metadata.json
+04787be4fd286266064f7dae71e58dbc4caa95109ec38b5404fb6f2c934a2859  core/summary.json
+44bb1f5f13d114980edb6472ca71591c215c5970fcfceffd0a15bc9d1e20490a  corpus-comparison.json
+2ae8f3b1ad0bf690a046f86bccc30b77365c4d24c18eaa955e4a1e66374156dc  gate.log
+14812f20e690a2bab76a1403f6d86adc5d56b503dc6931a8f87bdb77fe693f1a  metadata.json
+8bdd83da98853aa6b4ed923415e9b718e454507e799f308fb8052c807d44bb94  polyxml-integration-corpus.sh.txt
+fdff656cf37b9eda11a2291b702f8443083deabff26a93aeac73ad6118696a26  polyxml-integration-verify.sh.txt
+7e752ac7b8e566ca866fe935e7748cb7924b97d5d9278508cdf87beeca620525  polyxml-probe-integration.py.txt
+31975766d4a5fc91199b397ade779c33ed066f3162c0f915ebd3a80d29f1a4de  probe.json
+88fc3ab3efe483e7d891c180c7cc3a2c6a98cc4fbe901b5c4294cd74c4bfa172  probe.log
diff --git a/research/data/runtime-followups-2026-10-03/integration/archive-criterion.py.txt b/research/data/runtime-followups-2026-10-03/integration/archive-criterion.py.txt
new file mode 100644
index 0000000..e92f73c
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/integration/archive-criterion.py.txt
@@ -0,0 +1,26 @@
+from pathlib import Path
+import gzip,hashlib,re,shutil,sys,tarfile
+root=Path(sys.argv[1])
+original=dict(line.split('  ',1)[::-1] for line in (root/'SHA256SUMS').read_text().splitlines())
+for dataset in sorted(root.iterdir()):
+ if not dataset.is_dir(): continue
+ directories=sorted(p for p in dataset.iterdir() if p.is_dir() and re.fullmatch(r'(baseline|current)-[0-9]+',p.name))
+ if not directories: continue
+ archive=dataset/'criterion-results.tar.gz'
+ assert not archive.exists(),archive
+ files=sorted(p for directory in directories for p in directory.rglob('*') if p.is_file())
+ expected={str(p.relative_to(dataset)):hashlib.sha256(p.read_bytes()).hexdigest() for p in files}
+ for path in files:
+  assert original[str(path.relative_to(root))]==expected[str(path.relative_to(dataset))],path
+ with archive.open('wb') as output,gzip.GzipFile(filename='',mode='wb',fileobj=output,mtime=0) as compressed,tarfile.open(fileobj=compressed,mode='w') as tar:
+  for path in files:
+   info=tar.gettarinfo(str(path),arcname=str(path.relative_to(dataset)))
+   info.mtime=0;info.uid=0;info.gid=0;info.uname='';info.gname=''
+   with path.open('rb') as source:tar.addfile(info,source)
+ with tarfile.open(archive,'r:gz') as tar:
+  observed={member.name:hashlib.sha256(tar.extractfile(member).read()).hexdigest() for member in tar.getmembers() if member.isfile()}
+ assert observed==expected,archive
+ (dataset/'criterion-SHA256SUMS').write_text(''.join(digest+'  '+name+'\n' for name,digest in expected.items()))
+ for directory in directories:shutil.rmtree(directory)
+ print(dataset.name,len(files))
+(root/'SHA256SUMS').write_text(''.join(hashlib.sha256(p.read_bytes()).hexdigest()+'  '+str(p.relative_to(root))+'\n' for p in sorted(root.rglob('*')) if p.is_file() and p!=root/'SHA256SUMS'))
diff --git a/research/data/runtime-followups-2026-10-03/integration/branches/baseline-0.txt b/research/data/runtime-followups-2026-10-03/integration/branches/baseline-0.txt
new file mode 100644
index 0000000..6166e6b
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/integration/branches/baseline-0.txt
@@ -0,0 +1,41 @@
+memcap: <=7645 MiB (60% of 12742 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_1/1000
+Benchmarking branch_write/branches_1/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_1/1000: Collecting 50 samples in estimated 2.0016 s (30k iterations)
+Benchmarking branch_write/branches_1/1000: Analyzing
+branch_write/branches_1/1000
+                        time:   [63.357 µs 64.648 µs 66.883 µs]
+                        thrpt:  [169.72 MiB/s 175.59 MiB/s 179.17 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  3 (6.00%) high mild
+  4 (8.00%) high severe
+Benchmarking branch_write/branches_16/1000
+Benchmarking branch_write/branches_16/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_16/1000: Collecting 50 samples in estimated 2.0028 s (29k iterations)
+Benchmarking branch_write/branches_16/1000: Analyzing
+branch_write/branches_16/1000
+                        time:   [68.977 µs 69.508 µs 70.163 µs]
+                        thrpt:  [171.90 MiB/s 173.52 MiB/s 174.86 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  2 (4.00%) high mild
+  4 (8.00%) high severe
+Benchmarking branch_write/branches_64/1000
+Benchmarking branch_write/branches_64/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/1000: Collecting 50 samples in estimated 2.0013 s (19k iterations)
+Benchmarking branch_write/branches_64/1000: Analyzing
+branch_write/branches_64/1000
+                        time:   [103.81 µs 104.23 µs 104.75 µs]
+                        thrpt:  [123.67 MiB/s 124.28 MiB/s 124.78 MiB/s]
+Found 2 outliers among 50 measurements (4.00%)
+  1 (2.00%) high mild
+  1 (2.00%) high severe
+Benchmarking branch_write/branches_256/1000
+Benchmarking branch_write/branches_256/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/1000: Collecting 50 samples in estimated 2.0057 s (12k iterations)
+Benchmarking branch_write/branches_256/1000: Analyzing
+branch_write/branches_256/1000
+                        time:   [174.69 µs 177.35 µs 180.84 µs]
+                        thrpt:  [79.226 MiB/s 80.786 MiB/s 82.012 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  6 (12.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/integration/branches/baseline-1.txt b/research/data/runtime-followups-2026-10-03/integration/branches/baseline-1.txt
new file mode 100644
index 0000000..ea64049
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/integration/branches/baseline-1.txt
@@ -0,0 +1,41 @@
+memcap: <=7708 MiB (60% of 12847 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_1/1000
+Benchmarking branch_write/branches_1/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_1/1000: Collecting 50 samples in estimated 2.0009 s (31k iterations)
+Benchmarking branch_write/branches_1/1000: Analyzing
+branch_write/branches_1/1000
+                        time:   [63.470 µs 64.009 µs 64.632 µs]
+                        thrpt:  [175.63 MiB/s 177.34 MiB/s 178.85 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  1 (2.00%) high mild
+  6 (12.00%) high severe
+Benchmarking branch_write/branches_16/1000
+Benchmarking branch_write/branches_16/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_16/1000: Collecting 50 samples in estimated 2.0003 s (28k iterations)
+Benchmarking branch_write/branches_16/1000: Analyzing
+branch_write/branches_16/1000
+                        time:   [69.247 µs 70.069 µs 71.176 µs]
+                        thrpt:  [169.45 MiB/s 172.13 MiB/s 174.18 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  1 (2.00%) high mild
+  4 (8.00%) high severe
+Benchmarking branch_write/branches_64/1000
+Benchmarking branch_write/branches_64/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/1000: Collecting 50 samples in estimated 2.0048 s (19k iterations)
+Benchmarking branch_write/branches_64/1000: Analyzing
+branch_write/branches_64/1000
+                        time:   [104.43 µs 105.87 µs 107.79 µs]
+                        thrpt:  [120.18 MiB/s 122.36 MiB/s 124.04 MiB/s]
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+  5 (10.00%) high severe
+Benchmarking branch_write/branches_256/1000
+Benchmarking branch_write/branches_256/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/1000: Collecting 50 samples in estimated 2.0066 s (11k iterations)
+Benchmarking branch_write/branches_256/1000: Analyzing
+branch_write/branches_256/1000
+                        time:   [174.23 µs 174.69 µs 175.23 µs]
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diff --git a/research/data/runtime-followups-2026-10-03/integration/branches/baseline-build.txt b/research/data/runtime-followups-2026-10-03/integration/branches/baseline-build.txt
new file mode 100644
index 0000000..a00df3e
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diff --git a/research/data/runtime-followups-2026-10-03/integration/branches/baseline.lock b/research/data/runtime-followups-2026-10-03/integration/branches/baseline.lock
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new file mode 100644
index 0000000..eeb0cf1
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/integration/branches/criterion-SHA256SUMS
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diff --git a/research/data/runtime-followups-2026-10-03/integration/branches/criterion-results.tar.gz b/research/data/runtime-followups-2026-10-03/integration/branches/criterion-results.tar.gz
new file mode 100644
index 0000000..432798e
Binary files /dev/null and b/research/data/runtime-followups-2026-10-03/integration/branches/criterion-results.tar.gz differ
diff --git a/research/data/runtime-followups-2026-10-03/integration/branches/current-0.txt b/research/data/runtime-followups-2026-10-03/integration/branches/current-0.txt
new file mode 100644
index 0000000..cfa0599
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/integration/branches/current-0.txt
@@ -0,0 +1,42 @@
+memcap: <=7709 MiB (60% of 12848 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_1/1000
+Benchmarking branch_write/branches_1/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_1/1000: Collecting 50 samples in estimated 2.0010 s (33k iterations)
+Benchmarking branch_write/branches_1/1000: Analyzing
+branch_write/branches_1/1000
+                        time:   [61.873 µs 62.061 µs 62.274 µs]
+                        thrpt:  [182.28 MiB/s 182.91 MiB/s 183.47 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  2 (4.00%) high mild
+  1 (2.00%) high severe
+Benchmarking branch_write/branches_16/1000
+Benchmarking branch_write/branches_16/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_16/1000: Collecting 50 samples in estimated 2.0003 s (31k iterations)
+Benchmarking branch_write/branches_16/1000: Analyzing
+branch_write/branches_16/1000
+                        time:   [65.234 µs 65.573 µs 65.992 µs]
+                        thrpt:  [182.77 MiB/s 183.94 MiB/s 184.89 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  2 (4.00%) high mild
+  3 (6.00%) high severe
+Benchmarking branch_write/branches_64/1000
+Benchmarking branch_write/branches_64/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/1000: Collecting 50 samples in estimated 2.0002 s (27k iterations)
+Benchmarking branch_write/branches_64/1000: Analyzing
+branch_write/branches_64/1000
+                        time:   [74.421 µs 74.774 µs 75.227 µs]
+                        thrpt:  [172.20 MiB/s 173.24 MiB/s 174.06 MiB/s]
+Found 2 outliers among 50 measurements (4.00%)
+  1 (2.00%) high mild
+  1 (2.00%) high severe
+Benchmarking branch_write/branches_256/1000
+Benchmarking branch_write/branches_256/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/1000: Collecting 50 samples in estimated 2.0022 s (25k iterations)
+Benchmarking branch_write/branches_256/1000: Analyzing
+branch_write/branches_256/1000
+                        time:   [80.771 µs 81.673 µs 82.778 µs]
+                        thrpt:  [173.08 MiB/s 175.42 MiB/s 177.38 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  1 (2.00%) high mild
+  4 (8.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/integration/branches/current-1.txt b/research/data/runtime-followups-2026-10-03/integration/branches/current-1.txt
new file mode 100644
index 0000000..b62a6aa
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/integration/branches/current-1.txt
@@ -0,0 +1,41 @@
+memcap: <=7709 MiB (60% of 12849 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_1/1000
+Benchmarking branch_write/branches_1/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_1/1000: Collecting 50 samples in estimated 2.0018 s (32k iterations)
+Benchmarking branch_write/branches_1/1000: Analyzing
+branch_write/branches_1/1000
+                        time:   [59.795 µs 59.997 µs 60.236 µs]
+                        thrpt:  [188.45 MiB/s 189.20 MiB/s 189.84 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  1 (2.00%) high mild
+  2 (4.00%) high severe
+Benchmarking branch_write/branches_16/1000
+Benchmarking branch_write/branches_16/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_16/1000: Collecting 50 samples in estimated 2.0004 s (31k iterations)
+Benchmarking branch_write/branches_16/1000: Analyzing
+branch_write/branches_16/1000
+                        time:   [65.302 µs 65.987 µs 66.796 µs]
+                        thrpt:  [180.57 MiB/s 182.78 MiB/s 184.70 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  4 (8.00%) high mild
+  3 (6.00%) high severe
+Benchmarking branch_write/branches_64/1000
+Benchmarking branch_write/branches_64/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/1000: Collecting 50 samples in estimated 2.0007 s (27k iterations)
+Benchmarking branch_write/branches_64/1000: Analyzing
+branch_write/branches_64/1000
+                        time:   [73.639 µs 74.045 µs 74.633 µs]
+                        thrpt:  [173.57 MiB/s 174.94 MiB/s 175.91 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  2 (4.00%) high mild
+  1 (2.00%) high severe
+Benchmarking branch_write/branches_256/1000
+Benchmarking branch_write/branches_256/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/1000: Collecting 50 samples in estimated 2.0037 s (25k iterations)
+Benchmarking branch_write/branches_256/1000: Analyzing
+branch_write/branches_256/1000
+                        time:   [78.641 µs 78.895 µs 79.173 µs]
+                        thrpt:  [180.96 MiB/s 181.60 MiB/s 182.18 MiB/s]
+Found 1 outliers among 50 measurements (2.00%)
+  1 (2.00%) high mild
+
diff --git a/research/data/runtime-followups-2026-10-03/integration/branches/current-build.txt b/research/data/runtime-followups-2026-10-03/integration/branches/current-build.txt
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index 0000000..fdcc35c
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+++ b/research/data/runtime-followups-2026-10-03/integration/branches/current-build.txt
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+    Finished `bench` profile [optimized] target(s) in 2.73s
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index 0000000..78a11b2
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diff --git a/research/data/runtime-followups-2026-10-03/integration/branches/harness.rs b/research/data/runtime-followups-2026-10-03/integration/branches/harness.rs
new file mode 100644
index 0000000..04793ae
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/integration/branches/harness.rs
@@ -0,0 +1,77 @@
+use criterion::{
+    criterion_group, criterion_main, BenchmarkId, Criterion, SamplingMode, Throughput,
+};
+use polyxml::schema::ModelSchema;
+use polyxml::schema_parser::XsdParser;
+use polyxml::{deserialize, serialize, PolyValue};
+use std::{hint::black_box, sync::Arc};
+
+fn fixture(branches: usize, count: usize) -> (Arc<ModelSchema>, Vec<u8>) {
+    let declarations = (0..branches)
+        .map(|i| format!(r#"<xs:element name="B{i}" type="xs:int"/>"#))
+        .collect::<String>();
+    let xsd = format!(
+        r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"><xs:element name="Root"><xs:complexType mixed="true"><xs:choice minOccurs="0" maxOccurs="unbounded">{declarations}</xs:choice></xs:complexType></xs:element></xs:schema>"#
+    );
+    let ir = XsdParser::new().parse_str(&xsd).unwrap();
+    let schema = ModelSchema::from_ir(&ir, Some("Root")).unwrap();
+    let body = (0..count)
+        .map(|i| format!("<B{}>{i}</B{}>", i % branches, i % branches))
+        .collect::<String>();
+    let xml = format!("<Root>{body}</Root>").into_bytes();
+    let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+    let mixed = schema.mixed_content.as_ref().unwrap();
+    let field = &schema.fields[mixed.items_index].name;
+    let items = value.get(field).and_then(PolyValue::as_list).unwrap();
+    assert_eq!(items.len(), count);
+    for (i, item) in items.iter().enumerate() {
+        assert_eq!(item.get("value"), Some(&PolyValue::Int(i as i64)));
+        let kind = item.get("kind").and_then(PolyValue::as_str).unwrap();
+        let branch = mixed
+            .branches
+            .iter()
+            .find(|b| b.variant_name == kind)
+            .unwrap();
+        assert_eq!(branch.xml_name, format!("B{}", i % branches).as_bytes());
+    }
+    let output = serialize("Root", &value, &schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+    let output = serialize("Sensor", &value, &schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    (schema, xml)
+}
+
+fn benchmarks(c: &mut Criterion) {
+    for operation in ["branch_read", "branch_write"] {
+        let mut group = c.benchmark_group(operation);
+        group.sampling_mode(SamplingMode::Flat);
+        for branches in [1, 16, 64, 256] {
+            for count in [1, 32, 64, 128, 1000, 1024] {
+                let (schema, xml) = fixture(branches, count);
+                let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+                group.throughput(Throughput::Bytes(xml.len() as u64));
+                group.bench_with_input(
+                    BenchmarkId::new(format!("branches_{branches}"), count),
+                    &count,
+                    |b, _| {
+                        b.iter(|| {
+                            if operation == "branch_read" {
+                                black_box(
+                                    deserialize(black_box(&xml), Arc::clone(&schema)).unwrap(),
+                                );
+                            } else {
+                                black_box(
+                                    serialize("Root", black_box(&value), &schema, None).unwrap(),
+                                );
+                            }
+                        });
+                    },
+                );
+            }
+        }
+        group.finish();
+    }
+}
+criterion_group!(benches, benchmarks);
+criterion_main!(benches);
diff --git a/research/data/runtime-followups-2026-10-03/integration/branches/metadata.json b/research/data/runtime-followups-2026-10-03/integration/branches/metadata.json
new file mode 100644
index 0000000..c891572
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/integration/branches/metadata.json
@@ -0,0 +1,19 @@
+{
+  "revisions": {
+    "baseline": "1819c91b0808b9242c642d82350d2b657b60108c",
+    "current": "71aff6ca6cbe7106dcc2389a2428571a16d69430"
+  },
+  "core_status": {
+    "baseline": "",
+    "current": ""
+  },
+  "sample_size": 50,
+  "warmup_seconds": 1.0,
+  "measurement_seconds": 2.0,
+  "rounds": 2,
+  "filter": "^branch_write/.*/1000$",
+  "order": "alternate baseline/current per round",
+  "os": "Linux-6.18.40.1-microsoft-standard-WSL2-x86_64-with-glibc2.43",
+  "cpu": "11th Gen Intel(R) Core(TM) i5-11600K @ 3.90GHz",
+  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)\nbinary: rustc\ncommit-hash: b940084d7eb6a299eb4bfeb8e34901bc051e7ac4\ncommit-date: 2026-09-28\nhost: x86_64-unknown-linux-gnu\nrelease: 1.99.0\nLLVM version: 23.1.1\n"
+}
diff --git a/research/data/runtime-followups-2026-10-03/integration/branches/summary.json b/research/data/runtime-followups-2026-10-03/integration/branches/summary.json
new file mode 100644
index 0000000..960cfab
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/integration/branches/summary.json
@@ -0,0 +1,210 @@
+{
+  "branch_write/branches_1/1000": {
+    "baseline_ns": 64328.74713332762,
+    "candidate_ns": 61028.935791734955,
+    "delta_percent": -5.129606107131979,
+    "speedup": 1.054069619579366,
+    "process_deltas_percent": [
+      -4.001836090906141,
+      -6.268627927265181
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 63356.84208940396,
+            "upper_bound": 66882.69534519868
+          },
+          "point_estimate": 64648.05940397352,
+          "standard_error": 1008.9430052109713
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 63469.66638368338,
+            "upper_bound": 64631.88791437803
+          },
+          "point_estimate": 64009.43486268172,
+          "standard_error": 297.7645355927075
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 61873.18512116564,
+            "upper_bound": 62274.32493941717
+          },
+          "point_estimate": 62060.95003067487,
+          "standard_error": 102.62286776560046
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 59795.200436335406,
+            "upper_bound": 60236.26950310559
+          },
+          "point_estimate": 59996.921552795044,
+          "standard_error": 112.6986931439003
+        }
+      ]
+    }
+  },
+  "branch_write/branches_16/1000": {
+    "baseline_ns": 69788.80172768669,
+    "candidate_ns": 65779.89423701298,
+    "delta_percent": -5.744342059799679,
+    "speedup": 1.0609442678066512,
+    "process_deltas_percent": [
+      -5.661943017448334,
+      -5.826081090040914
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 68977.31994502616,
+            "upper_bound": 70162.93964746944
+          },
+          "point_estimate": 69508.17546247819,
+          "standard_error": 305.5510094965081
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 69246.79457282415,
+            "upper_bound": 71176.44141119007
+          },
+          "point_estimate": 70069.4279928952,
+          "standard_error": 499.0342372706271
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 65233.60918019481,
+            "upper_bound": 65992.32039204544
+          },
+          "point_estimate": 65572.66217532467,
+          "standard_error": 195.24058330160977
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 65301.794221590906,
+            "upper_bound": 66796.20570616885
+          },
+          "point_estimate": 65987.1262987013,
+          "standard_error": 383.1903178118608
+        }
+      ]
+    }
+  },
+  "branch_write/branches_256/1000": {
+    "baseline_ns": 176019.79193173148,
+    "candidate_ns": 80284.23228507678,
+    "delta_percent": -54.38908806561101,
+    "speedup": 2.1924578079879082,
+    "process_deltas_percent": [
+      -53.94669417036191,
+      -54.83819628151125
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 174694.0258913044,
+            "upper_bound": 180836.71660869557
+          },
+          "point_estimate": 177345.4795652174,
+          "standard_error": 1584.1448051598036
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 174225.54936842105,
+            "upper_bound": 175234.65001754387
+          },
+          "point_estimate": 174694.10429824557,
+          "standard_error": 259.50283421567826
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 80771.13179207918,
+            "upper_bound": 82778.00618019803
+          },
+          "point_estimate": 81673.45607920788,
+          "standard_error": 514.899994792032
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 78641.46049496983,
+            "upper_bound": 79172.90482193159
+          },
+          "point_estimate": 78895.00849094568,
+          "standard_error": 135.71874370091737
+        }
+      ]
+    }
+  },
+  "branch_write/branches_64/1000": {
+    "baseline_ns": 105048.19752017889,
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+      -30.059974534272538
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+            "lower_bound": 103812.7218193717,
+            "upper_bound": 104748.2042185864
+          },
+          "point_estimate": 104226.9577486911,
+          "standard_error": 241.27708733912684
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+        {
+          "confidence_interval": {
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+            "lower_bound": 104433.97616796875,
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+        {
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+            "lower_bound": 74421.39472559853,
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+          "standard_error": 206.43462684982683
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+            "confidence_level": 0.95,
+            "lower_bound": 73638.917652214,
+            "upper_bound": 74632.85560424355
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diff --git a/research/data/runtime-followups-2026-10-03/integration/companion-binding.log b/research/data/runtime-followups-2026-10-03/integration/companion-binding.log
new file mode 100644
index 0000000..2fe371b
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/integration/companion-binding.log
@@ -0,0 +1,10 @@
+memcap: <=7646 MiB (60% of 12744 MiB available) [systemd MemoryMax, swap off]
+🍹 Building a mixed python/rust project
+🐍 Found CPython 3.14 at /home/bailey/github/polyxml-w3c-tests/.venv/bin/python
+🔗 Found pyo3 bindings with abi3-py3.12 support
+📡 Using build options features from pyproject.toml
+Checked 6 packages in 0.59ms
+    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.02s
+📦 Built wheel for abi3 Python ≥ 3.12 to /tmp/.tmp4r6aDh/polyxml-0.34.6-cp312-abi3-linux_x86_64.whl
+✏️ Setting installed package as editable
+🛠 Installed polyxml-0.34.6
diff --git a/research/data/runtime-followups-2026-10-03/integration/core/baseline-0.txt b/research/data/runtime-followups-2026-10-03/integration/core/baseline-0.txt
new file mode 100644
index 0000000..556e00a
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/integration/core/baseline-0.txt
@@ -0,0 +1,65 @@
+memcap: <=7650 MiB (60% of 12750 MiB available) [systemd MemoryMax, swap off]
+Benchmarking deserialization/sensor_micro
+Benchmarking deserialization/sensor_micro: Warming up for 3.0000 s
+Benchmarking deserialization/sensor_micro: Collecting 100 samples in estimated 5.0043 s (4.8M iterations)
+Benchmarking deserialization/sensor_micro: Analyzing
+deserialization/sensor_micro
+                        time:   [1.0081 µs 1.0139 µs 1.0204 µs]
+                        thrpt:  [87.855 MiB/s 88.416 MiB/s 88.926 MiB/s]
+Found 7 outliers among 100 measurements (7.00%)
+  6 (6.00%) high mild
+  1 (1.00%) high severe
+Benchmarking deserialization/catalog_items/1000
+Benchmarking deserialization/catalog_items/1000: Warming up for 3.0000 s
+Benchmarking deserialization/catalog_items/1000: Collecting 100 samples in estimated 8.0122 s (10k iterations)
+Benchmarking deserialization/catalog_items/1000: Analyzing
+deserialization/catalog_items/1000
+                        time:   [788.85 µs 794.20 µs 800.89 µs]
+                        thrpt:  [76.104 MiB/s 76.744 MiB/s 77.264 MiB/s]
+Found 12 outliers among 100 measurements (12.00%)
+  5 (5.00%) high mild
+  7 (7.00%) high severe
+Benchmarking deserialization/catalog_items/10000
+Benchmarking deserialization/catalog_items/10000: Warming up for 3.0000 s
+Benchmarking deserialization/catalog_items/10000: Collecting 100 samples in estimated 5.6033 s (700 iterations)
+Benchmarking deserialization/catalog_items/10000: Analyzing
+deserialization/catalog_items/10000
+                        time:   [7.9448 ms 8.0001 ms 8.0622 ms]
+                        thrpt:  [79.126 MiB/s 79.739 MiB/s 80.294 MiB/s]
+Found 13 outliers among 100 measurements (13.00%)
+  2 (2.00%) high mild
+  11 (11.00%) high severe
+
+Benchmarking serialization/sensor_micro
+Benchmarking serialization/sensor_micro: Warming up for 3.0000 s
+Benchmarking serialization/sensor_micro: Collecting 100 samples in estimated 5.0010 s (22M iterations)
+Benchmarking serialization/sensor_micro: Analyzing
+serialization/sensor_micro
+                        time:   [225.44 ns 226.79 ns 228.44 ns]
+                        thrpt:  [392.42 MiB/s 395.28 MiB/s 397.65 MiB/s]
+Found 11 outliers among 100 measurements (11.00%)
+  5 (5.00%) high mild
+  6 (6.00%) high severe
+Benchmarking serialization/catalog_items/1000
+Benchmarking serialization/catalog_items/1000: Warming up for 3.0000 s
+Benchmarking serialization/catalog_items/1000: Collecting 100 samples in estimated 5.3844 s (30k iterations)
+Benchmarking serialization/catalog_items/1000: Analyzing
+serialization/catalog_items/1000
+                        time:   [177.08 µs 178.04 µs 179.19 µs]
+                        thrpt:  [337.48 MiB/s 339.67 MiB/s 341.51 MiB/s]
+Found 13 outliers among 100 measurements (13.00%)
+  7 (7.00%) high mild
+  6 (6.00%) high severe
+Benchmarking serialization/catalog_items/10000
+Benchmarking serialization/catalog_items/10000: Warming up for 3.0000 s
+
+Warning: Unable to complete 100 samples in 5.0s. You may wish to increase target time to 9.0s, enable flat sampling, or reduce sample count to 50.
+Benchmarking serialization/catalog_items/10000: Collecting 100 samples in estimated 9.0271 s (5050 iterations)
+Benchmarking serialization/catalog_items/10000: Analyzing
+serialization/catalog_items/10000
+                        time:   [1.7831 ms 1.7906 ms 1.7997 ms]
+                        thrpt:  [351.82 MiB/s 353.59 MiB/s 355.10 MiB/s]
+Found 9 outliers among 100 measurements (9.00%)
+  4 (4.00%) high mild
+  5 (5.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/integration/core/baseline-1.txt b/research/data/runtime-followups-2026-10-03/integration/core/baseline-1.txt
new file mode 100644
index 0000000..5522cd5
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/integration/core/baseline-1.txt
@@ -0,0 +1,65 @@
+memcap: <=7701 MiB (60% of 12836 MiB available) [systemd MemoryMax, swap off]
+Benchmarking deserialization/sensor_micro
+Benchmarking deserialization/sensor_micro: Warming up for 3.0000 s
+Benchmarking deserialization/sensor_micro: Collecting 100 samples in estimated 5.0011 s (4.9M iterations)
+Benchmarking deserialization/sensor_micro: Analyzing
+deserialization/sensor_micro
+                        time:   [1000.00 ns 1.0040 µs 1.0089 µs]
+                        thrpt:  [88.852 MiB/s 89.288 MiB/s 89.646 MiB/s]
+Found 10 outliers among 100 measurements (10.00%)
+  7 (7.00%) high mild
+  3 (3.00%) high severe
+Benchmarking deserialization/catalog_items/1000
+Benchmarking deserialization/catalog_items/1000: Warming up for 3.0000 s
+Benchmarking deserialization/catalog_items/1000: Collecting 100 samples in estimated 8.0144 s (10k iterations)
+Benchmarking deserialization/catalog_items/1000: Analyzing
+deserialization/catalog_items/1000
+                        time:   [785.28 µs 790.95 µs 798.31 µs]
+                        thrpt:  [76.349 MiB/s 77.060 MiB/s 77.616 MiB/s]
+Found 12 outliers among 100 measurements (12.00%)
+  5 (5.00%) high mild
+  7 (7.00%) high severe
+Benchmarking deserialization/catalog_items/10000
+Benchmarking deserialization/catalog_items/10000: Warming up for 3.0000 s
+Benchmarking deserialization/catalog_items/10000: Collecting 100 samples in estimated 5.6172 s (700 iterations)
+Benchmarking deserialization/catalog_items/10000: Analyzing
+deserialization/catalog_items/10000
+                        time:   [7.8955 ms 7.9343 ms 7.9818 ms]
+                        thrpt:  [79.923 MiB/s 80.400 MiB/s 80.796 MiB/s]
+Found 8 outliers among 100 measurements (8.00%)
+  2 (2.00%) high mild
+  6 (6.00%) high severe
+
+Benchmarking serialization/sensor_micro
+Benchmarking serialization/sensor_micro: Warming up for 3.0000 s
+Benchmarking serialization/sensor_micro: Collecting 100 samples in estimated 5.0010 s (22M iterations)
+Benchmarking serialization/sensor_micro: Analyzing
+serialization/sensor_micro
+                        time:   [226.18 ns 228.74 ns 232.03 ns]
+                        thrpt:  [386.36 MiB/s 391.90 MiB/s 396.35 MiB/s]
+Found 15 outliers among 100 measurements (15.00%)
+  3 (3.00%) high mild
+  12 (12.00%) high severe
+Benchmarking serialization/catalog_items/1000
+Benchmarking serialization/catalog_items/1000: Warming up for 3.0000 s
+Benchmarking serialization/catalog_items/1000: Collecting 100 samples in estimated 5.4132 s (30k iterations)
+Benchmarking serialization/catalog_items/1000: Analyzing
+serialization/catalog_items/1000
+                        time:   [177.08 µs 177.56 µs 178.11 µs]
+                        thrpt:  [339.53 MiB/s 340.57 MiB/s 341.51 MiB/s]
+Found 9 outliers among 100 measurements (9.00%)
+  5 (5.00%) high mild
+  4 (4.00%) high severe
+Benchmarking serialization/catalog_items/10000
+Benchmarking serialization/catalog_items/10000: Warming up for 3.0000 s
+
+Warning: Unable to complete 100 samples in 5.0s. You may wish to increase target time to 9.1s, enable flat sampling, or reduce sample count to 50.
+Benchmarking serialization/catalog_items/10000: Collecting 100 samples in estimated 9.0851 s (5050 iterations)
+Benchmarking serialization/catalog_items/10000: Analyzing
+serialization/catalog_items/10000
+                        time:   [1.7944 ms 1.7996 ms 1.8051 ms]
+                        thrpt:  [350.76 MiB/s 351.83 MiB/s 352.86 MiB/s]
+Found 5 outliers among 100 measurements (5.00%)
+  3 (3.00%) high mild
+  2 (2.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/integration/core/baseline-2.txt b/research/data/runtime-followups-2026-10-03/integration/core/baseline-2.txt
new file mode 100644
index 0000000..d816ad1
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/integration/core/baseline-2.txt
@@ -0,0 +1,65 @@
+memcap: <=7710 MiB (60% of 12851 MiB available) [systemd MemoryMax, swap off]
+Benchmarking deserialization/sensor_micro
+Benchmarking deserialization/sensor_micro: Warming up for 3.0000 s
+Benchmarking deserialization/sensor_micro: Collecting 100 samples in estimated 5.0028 s (4.9M iterations)
+Benchmarking deserialization/sensor_micro: Analyzing
+deserialization/sensor_micro
+                        time:   [1.0070 µs 1.0131 µs 1.0214 µs]
+                        thrpt:  [87.768 MiB/s 88.483 MiB/s 89.018 MiB/s]
+Found 7 outliers among 100 measurements (7.00%)
+  2 (2.00%) high mild
+  5 (5.00%) high severe
+Benchmarking deserialization/catalog_items/1000
+Benchmarking deserialization/catalog_items/1000: Warming up for 3.0000 s
+Benchmarking deserialization/catalog_items/1000: Collecting 100 samples in estimated 8.0225 s (10k iterations)
+Benchmarking deserialization/catalog_items/1000: Analyzing
+deserialization/catalog_items/1000
+                        time:   [793.56 µs 798.14 µs 803.90 µs]
+                        thrpt:  [75.818 MiB/s 76.365 MiB/s 76.807 MiB/s]
+Found 11 outliers among 100 measurements (11.00%)
+  3 (3.00%) high mild
+  8 (8.00%) high severe
+Benchmarking deserialization/catalog_items/10000
+Benchmarking deserialization/catalog_items/10000: Warming up for 3.0000 s
+Benchmarking deserialization/catalog_items/10000: Collecting 100 samples in estimated 5.5805 s (700 iterations)
+Benchmarking deserialization/catalog_items/10000: Analyzing
+deserialization/catalog_items/10000
+                        time:   [7.9600 ms 8.0202 ms 8.0939 ms]
+                        thrpt:  [78.816 MiB/s 79.540 MiB/s 80.142 MiB/s]
+Found 9 outliers among 100 measurements (9.00%)
+  4 (4.00%) high mild
+  5 (5.00%) high severe
+
+Benchmarking serialization/sensor_micro
+Benchmarking serialization/sensor_micro: Warming up for 3.0000 s
+Benchmarking serialization/sensor_micro: Collecting 100 samples in estimated 5.0006 s (22M iterations)
+Benchmarking serialization/sensor_micro: Analyzing
+serialization/sensor_micro
+                        time:   [225.45 ns 228.31 ns 232.36 ns]
+                        thrpt:  [385.81 MiB/s 392.64 MiB/s 397.62 MiB/s]
+Found 11 outliers among 100 measurements (11.00%)
+  6 (6.00%) high mild
+  5 (5.00%) high severe
+Benchmarking serialization/catalog_items/1000
+Benchmarking serialization/catalog_items/1000: Warming up for 3.0000 s
+Benchmarking serialization/catalog_items/1000: Collecting 100 samples in estimated 5.3523 s (30k iterations)
+Benchmarking serialization/catalog_items/1000: Analyzing
+serialization/catalog_items/1000
+                        time:   [175.92 µs 176.72 µs 177.91 µs]
+                        thrpt:  [339.91 MiB/s 342.19 MiB/s 343.76 MiB/s]
+Found 10 outliers among 100 measurements (10.00%)
+  3 (3.00%) high mild
+  7 (7.00%) high severe
+Benchmarking serialization/catalog_items/10000
+Benchmarking serialization/catalog_items/10000: Warming up for 3.0000 s
+
+Warning: Unable to complete 100 samples in 5.0s. You may wish to increase target time to 9.1s, enable flat sampling, or reduce sample count to 50.
+Benchmarking serialization/catalog_items/10000: Collecting 100 samples in estimated 9.1414 s (5050 iterations)
+Benchmarking serialization/catalog_items/10000: Analyzing
+serialization/catalog_items/10000
+                        time:   [1.7849 ms 1.7910 ms 1.7986 ms]
+                        thrpt:  [352.04 MiB/s 353.51 MiB/s 354.73 MiB/s]
+Found 9 outliers among 100 measurements (9.00%)
+  4 (4.00%) high mild
+  5 (5.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/integration/core/baseline-build.txt b/research/data/runtime-followups-2026-10-03/integration/core/baseline-build.txt
new file mode 100644
index 0000000..50516ad
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/integration/core/baseline-build.txt
@@ -0,0 +1,3 @@
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+    Finished `bench` profile [optimized] target(s) in 2.58s
diff --git a/research/data/runtime-followups-2026-10-03/integration/core/baseline.lock b/research/data/runtime-followups-2026-10-03/integration/core/baseline.lock
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index 0000000..78a11b2
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index 0000000..e388770
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diff --git a/research/data/runtime-followups-2026-10-03/integration/core/criterion-results.tar.gz b/research/data/runtime-followups-2026-10-03/integration/core/criterion-results.tar.gz
new file mode 100644
index 0000000..a1987a2
Binary files /dev/null and b/research/data/runtime-followups-2026-10-03/integration/core/criterion-results.tar.gz differ
diff --git a/research/data/runtime-followups-2026-10-03/integration/core/current-0.txt b/research/data/runtime-followups-2026-10-03/integration/core/current-0.txt
new file mode 100644
index 0000000..a46bcfd
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/integration/core/current-0.txt
@@ -0,0 +1,65 @@
+memcap: <=7708 MiB (60% of 12847 MiB available) [systemd MemoryMax, swap off]
+Benchmarking deserialization/sensor_micro
+Benchmarking deserialization/sensor_micro: Warming up for 3.0000 s
+Benchmarking deserialization/sensor_micro: Collecting 100 samples in estimated 5.0010 s (4.9M iterations)
+Benchmarking deserialization/sensor_micro: Analyzing
+deserialization/sensor_micro
+                        time:   [1.0082 µs 1.0123 µs 1.0171 µs]
+                        thrpt:  [88.142 MiB/s 88.554 MiB/s 88.916 MiB/s]
+Found 12 outliers among 100 measurements (12.00%)
+  6 (6.00%) high mild
+  6 (6.00%) high severe
+Benchmarking deserialization/catalog_items/1000
+Benchmarking deserialization/catalog_items/1000: Warming up for 3.0000 s
+Benchmarking deserialization/catalog_items/1000: Collecting 100 samples in estimated 8.0382 s (10k iterations)
+Benchmarking deserialization/catalog_items/1000: Analyzing
+deserialization/catalog_items/1000
+                        time:   [786.51 µs 790.75 µs 795.69 µs]
+                        thrpt:  [76.600 MiB/s 77.079 MiB/s 77.495 MiB/s]
+Found 13 outliers among 100 measurements (13.00%)
+  7 (7.00%) high mild
+  6 (6.00%) high severe
+Benchmarking deserialization/catalog_items/10000
+Benchmarking deserialization/catalog_items/10000: Warming up for 3.0000 s
+Benchmarking deserialization/catalog_items/10000: Collecting 100 samples in estimated 5.6233 s (700 iterations)
+Benchmarking deserialization/catalog_items/10000: Analyzing
+deserialization/catalog_items/10000
+                        time:   [7.8675 ms 7.9091 ms 7.9565 ms]
+                        thrpt:  [80.177 MiB/s 80.657 MiB/s 81.083 MiB/s]
+Found 11 outliers among 100 measurements (11.00%)
+  4 (4.00%) high mild
+  7 (7.00%) high severe
+
+Benchmarking serialization/sensor_micro
+Benchmarking serialization/sensor_micro: Warming up for 3.0000 s
+Benchmarking serialization/sensor_micro: Collecting 100 samples in estimated 5.0010 s (22M iterations)
+Benchmarking serialization/sensor_micro: Analyzing
+serialization/sensor_micro
+                        time:   [229.00 ns 230.36 ns 231.92 ns]
+                        thrpt:  [386.53 MiB/s 389.16 MiB/s 391.47 MiB/s]
+Found 11 outliers among 100 measurements (11.00%)
+  3 (3.00%) high mild
+  8 (8.00%) high severe
+Benchmarking serialization/catalog_items/1000
+Benchmarking serialization/catalog_items/1000: Warming up for 3.0000 s
+Benchmarking serialization/catalog_items/1000: Collecting 100 samples in estimated 5.4167 s (30k iterations)
+Benchmarking serialization/catalog_items/1000: Analyzing
+serialization/catalog_items/1000
+                        time:   [177.56 µs 179.08 µs 181.16 µs]
+                        thrpt:  [333.81 MiB/s 337.69 MiB/s 340.58 MiB/s]
+Found 10 outliers among 100 measurements (10.00%)
+  4 (4.00%) high mild
+  6 (6.00%) high severe
+Benchmarking serialization/catalog_items/10000
+Benchmarking serialization/catalog_items/10000: Warming up for 3.0000 s
+
+Warning: Unable to complete 100 samples in 5.0s. You may wish to increase target time to 9.2s, enable flat sampling, or reduce sample count to 50.
+Benchmarking serialization/catalog_items/10000: Collecting 100 samples in estimated 9.2456 s (5050 iterations)
+Benchmarking serialization/catalog_items/10000: Analyzing
+serialization/catalog_items/10000
+                        time:   [1.7980 ms 1.8103 ms 1.8257 ms]
+                        thrpt:  [346.80 MiB/s 349.74 MiB/s 352.15 MiB/s]
+Found 12 outliers among 100 measurements (12.00%)
+  2 (2.00%) high mild
+  10 (10.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/integration/core/current-1.txt b/research/data/runtime-followups-2026-10-03/integration/core/current-1.txt
new file mode 100644
index 0000000..57f3372
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/integration/core/current-1.txt
@@ -0,0 +1,65 @@
+memcap: <=7703 MiB (60% of 12838 MiB available) [systemd MemoryMax, swap off]
+Benchmarking deserialization/sensor_micro
+Benchmarking deserialization/sensor_micro: Warming up for 3.0000 s
+Benchmarking deserialization/sensor_micro: Collecting 100 samples in estimated 5.0046 s (4.9M iterations)
+Benchmarking deserialization/sensor_micro: Analyzing
+deserialization/sensor_micro
+                        time:   [1.0040 µs 1.0073 µs 1.0113 µs]
+                        thrpt:  [88.644 MiB/s 88.996 MiB/s 89.285 MiB/s]
+Found 8 outliers among 100 measurements (8.00%)
+  3 (3.00%) high mild
+  5 (5.00%) high severe
+Benchmarking deserialization/catalog_items/1000
+Benchmarking deserialization/catalog_items/1000: Warming up for 3.0000 s
+Benchmarking deserialization/catalog_items/1000: Collecting 100 samples in estimated 8.0267 s (10k iterations)
+Benchmarking deserialization/catalog_items/1000: Analyzing
+deserialization/catalog_items/1000
+                        time:   [787.47 µs 792.99 µs 800.65 µs]
+                        thrpt:  [76.126 MiB/s 76.861 MiB/s 77.400 MiB/s]
+Found 8 outliers among 100 measurements (8.00%)
+  3 (3.00%) high mild
+  5 (5.00%) high severe
+Benchmarking deserialization/catalog_items/10000
+Benchmarking deserialization/catalog_items/10000: Warming up for 3.0000 s
+Benchmarking deserialization/catalog_items/10000: Collecting 100 samples in estimated 5.6222 s (700 iterations)
+Benchmarking deserialization/catalog_items/10000: Analyzing
+deserialization/catalog_items/10000
+                        time:   [7.8906 ms 7.9430 ms 8.0041 ms]
+                        thrpt:  [79.699 MiB/s 80.313 MiB/s 80.846 MiB/s]
+Found 11 outliers among 100 measurements (11.00%)
+  5 (5.00%) high mild
+  6 (6.00%) high severe
+
+Benchmarking serialization/sensor_micro
+Benchmarking serialization/sensor_micro: Warming up for 3.0000 s
+Benchmarking serialization/sensor_micro: Collecting 100 samples in estimated 5.0010 s (22M iterations)
+Benchmarking serialization/sensor_micro: Analyzing
+serialization/sensor_micro
+                        time:   [227.28 ns 228.46 ns 229.82 ns]
+                        thrpt:  [390.06 MiB/s 392.39 MiB/s 394.43 MiB/s]
+Found 15 outliers among 100 measurements (15.00%)
+  9 (9.00%) high mild
+  6 (6.00%) high severe
+Benchmarking serialization/catalog_items/1000
+Benchmarking serialization/catalog_items/1000: Warming up for 3.0000 s
+Benchmarking serialization/catalog_items/1000: Collecting 100 samples in estimated 5.4502 s (30k iterations)
+Benchmarking serialization/catalog_items/1000: Analyzing
+serialization/catalog_items/1000
+                        time:   [179.62 µs 180.85 µs 182.35 µs]
+                        thrpt:  [331.64 MiB/s 334.39 MiB/s 336.67 MiB/s]
+Found 12 outliers among 100 measurements (12.00%)
+  7 (7.00%) high mild
+  5 (5.00%) high severe
+Benchmarking serialization/catalog_items/10000
+Benchmarking serialization/catalog_items/10000: Warming up for 3.0000 s
+
+Warning: Unable to complete 100 samples in 5.0s. You may wish to increase target time to 9.1s, enable flat sampling, or reduce sample count to 50.
+Benchmarking serialization/catalog_items/10000: Collecting 100 samples in estimated 9.0950 s (5050 iterations)
+Benchmarking serialization/catalog_items/10000: Analyzing
+serialization/catalog_items/10000
+                        time:   [1.8013 ms 1.8142 ms 1.8304 ms]
+                        thrpt:  [345.90 MiB/s 349.00 MiB/s 351.49 MiB/s]
+Found 10 outliers among 100 measurements (10.00%)
+  3 (3.00%) high mild
+  7 (7.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/integration/core/current-2.txt b/research/data/runtime-followups-2026-10-03/integration/core/current-2.txt
new file mode 100644
index 0000000..847beb0
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/integration/core/current-2.txt
@@ -0,0 +1,65 @@
+memcap: <=7706 MiB (60% of 12843 MiB available) [systemd MemoryMax, swap off]
+Benchmarking deserialization/sensor_micro
+Benchmarking deserialization/sensor_micro: Warming up for 3.0000 s
+Benchmarking deserialization/sensor_micro: Collecting 100 samples in estimated 5.0002 s (4.9M iterations)
+Benchmarking deserialization/sensor_micro: Analyzing
+deserialization/sensor_micro
+                        time:   [1.0092 µs 1.0140 µs 1.0198 µs]
+                        thrpt:  [87.902 MiB/s 88.411 MiB/s 88.827 MiB/s]
+Found 14 outliers among 100 measurements (14.00%)
+  7 (7.00%) high mild
+  7 (7.00%) high severe
+Benchmarking deserialization/catalog_items/1000
+Benchmarking deserialization/catalog_items/1000: Warming up for 3.0000 s
+Benchmarking deserialization/catalog_items/1000: Collecting 100 samples in estimated 8.0409 s (10k iterations)
+Benchmarking deserialization/catalog_items/1000: Analyzing
+deserialization/catalog_items/1000
+                        time:   [786.36 µs 791.06 µs 796.80 µs]
+                        thrpt:  [76.494 MiB/s 77.048 MiB/s 77.510 MiB/s]
+Found 13 outliers among 100 measurements (13.00%)
+  5 (5.00%) high mild
+  8 (8.00%) high severe
+Benchmarking deserialization/catalog_items/10000
+Benchmarking deserialization/catalog_items/10000: Warming up for 3.0000 s
+Benchmarking deserialization/catalog_items/10000: Collecting 100 samples in estimated 5.5091 s (700 iterations)
+Benchmarking deserialization/catalog_items/10000: Analyzing
+deserialization/catalog_items/10000
+                        time:   [7.8257 ms 7.8601 ms 7.9020 ms]
+                        thrpt:  [80.729 MiB/s 81.160 MiB/s 81.517 MiB/s]
+Found 8 outliers among 100 measurements (8.00%)
+  1 (1.00%) high mild
+  7 (7.00%) high severe
+
+Benchmarking serialization/sensor_micro
+Benchmarking serialization/sensor_micro: Warming up for 3.0000 s
+Benchmarking serialization/sensor_micro: Collecting 100 samples in estimated 5.0011 s (22M iterations)
+Benchmarking serialization/sensor_micro: Analyzing
+serialization/sensor_micro
+                        time:   [227.55 ns 229.20 ns 231.79 ns]
+                        thrpt:  [386.75 MiB/s 391.12 MiB/s 393.95 MiB/s]
+Found 12 outliers among 100 measurements (12.00%)
+  4 (4.00%) high mild
+  8 (8.00%) high severe
+Benchmarking serialization/catalog_items/1000
+Benchmarking serialization/catalog_items/1000: Warming up for 3.0000 s
+Benchmarking serialization/catalog_items/1000: Collecting 100 samples in estimated 5.4290 s (30k iterations)
+Benchmarking serialization/catalog_items/1000: Analyzing
+serialization/catalog_items/1000
+                        time:   [177.55 µs 178.24 µs 179.09 µs]
+                        thrpt:  [337.68 MiB/s 339.29 MiB/s 340.61 MiB/s]
+Found 9 outliers among 100 measurements (9.00%)
+  1 (1.00%) high mild
+  8 (8.00%) high severe
+Benchmarking serialization/catalog_items/10000
+Benchmarking serialization/catalog_items/10000: Warming up for 3.0000 s
+
+Warning: Unable to complete 100 samples in 5.0s. You may wish to increase target time to 9.1s, enable flat sampling, or reduce sample count to 50.
+Benchmarking serialization/catalog_items/10000: Collecting 100 samples in estimated 9.1379 s (5050 iterations)
+Benchmarking serialization/catalog_items/10000: Analyzing
+serialization/catalog_items/10000
+                        time:   [1.8066 ms 1.8278 ms 1.8542 ms]
+                        thrpt:  [341.48 MiB/s 346.41 MiB/s 350.47 MiB/s]
+Found 11 outliers among 100 measurements (11.00%)
+  3 (3.00%) high mild
+  8 (8.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/integration/core/current-build.txt b/research/data/runtime-followups-2026-10-03/integration/core/current-build.txt
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+   Compiling core-regression v0.0.0 (/home/bailey/github/polyxml-runtime-integration/benchmarks/rust-xml-regression/target/core-current)
+    Finished `bench` profile [optimized] target(s) in 26.58s
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diff --git a/research/data/runtime-followups-2026-10-03/integration/core/harness.rs b/research/data/runtime-followups-2026-10-03/integration/core/harness.rs
new file mode 100644
index 0000000..073ad98
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/integration/core/harness.rs
@@ -0,0 +1,172 @@
+use std::hint::black_box;
+
+use criterion::{criterion_group, criterion_main, BenchmarkId, Criterion, Throughput};
+use polyxml::schema::{FieldKind, FieldSchema, ModelSchema, ScalarType, ValueType};
+use polyxml::{deserialize, serialize};
+use std::sync::Arc;
+
+fn build_sensor_fixture() -> (Arc<ModelSchema>, Vec<u8>) {
+    let schema = ModelSchema::builder("Sensor")
+        .field(FieldSchema::new(
+            "id",
+            b"id",
+            FieldKind::Attribute,
+            ValueType::Scalar(ScalarType::Int),
+        ))
+        .field(FieldSchema::new(
+            "temp",
+            b"temp",
+            FieldKind::Element,
+            ValueType::Scalar(ScalarType::Float),
+        ))
+        .field(FieldSchema::new(
+            "status",
+            b"status",
+            FieldKind::Element,
+            ValueType::Scalar(ScalarType::String),
+        ))
+        .field(FieldSchema::new(
+            "active",
+            b"active",
+            FieldKind::Element,
+            ValueType::Scalar(ScalarType::Bool),
+        ))
+        .build();
+
+    let xml = br#"<Sensor id="1001"><temp>23.75</temp><status>OPERATIONAL</status><active>true</active></Sensor>"#.to_vec();
+    let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+    let output = serialize("Sensor", &value, &schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    (schema, xml)
+}
+
+fn build_catalog_fixture(count: usize) -> (Arc<ModelSchema>, Vec<u8>) {
+    let item_schema = ModelSchema::builder("Item")
+        .field(FieldSchema::new(
+            "id",
+            b"id",
+            FieldKind::Attribute,
+            ValueType::Scalar(ScalarType::Int),
+        ))
+        .field(FieldSchema::new(
+            "name",
+            b"name",
+            FieldKind::Element,
+            ValueType::Scalar(ScalarType::String),
+        ))
+        .field(FieldSchema::new(
+            "price",
+            b"price",
+            FieldKind::Element,
+            ValueType::Scalar(ScalarType::Float),
+        ))
+        .build();
+
+    let catalog_schema = ModelSchema::builder("Catalog")
+        .field(FieldSchema::new(
+            "items",
+            b"item",
+            FieldKind::Element,
+            ValueType::List(Box::new(ValueType::Nested(item_schema))),
+        ))
+        .build();
+
+    let mut xml = String::with_capacity(count * 64 + 32);
+    xml.push_str("<Catalog>");
+    for i in 0..count {
+        use std::fmt::Write;
+        write!(
+            xml,
+            r#"<item id="{i}"><name>Part-{i}</name><price>{:.2}</price></item>"#,
+            (i as f64) * 1.25
+        )
+        .unwrap();
+    }
+    xml.push_str("</Catalog>");
+
+    let xml = xml.into_bytes();
+    let value = deserialize(&xml, Arc::clone(&catalog_schema)).unwrap();
+    assert_eq!(value.get("items").unwrap().as_list().unwrap().len(), count);
+    let output = serialize("Catalog", &value, &catalog_schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&catalog_schema)).unwrap());
+    (catalog_schema, xml)
+}
+
+fn bench_deserialization(c: &mut Criterion) {
+    let mut group = c.benchmark_group("deserialization");
+
+    // 1. Sensor Telemetry (Micro)
+    {
+        let (schema, xml) = build_sensor_fixture();
+        group.throughput(Throughput::Bytes(xml.len() as u64));
+        group.bench_function("sensor_micro", |b| {
+            b.iter(|| {
+                let res = deserialize(black_box(&xml), Arc::clone(&schema)).unwrap();
+                black_box(res);
+            });
+        });
+    }
+
+    // 2. Catalog Batch (1,000 and 10,000 items)
+    for &count in &[1_000, 10_000] {
+        let (schema, xml) = build_catalog_fixture(count);
+        group.throughput(Throughput::Bytes(xml.len() as u64));
+        group.bench_with_input(BenchmarkId::new("catalog_items", count), &count, |b, _| {
+            b.iter(|| {
+                let res = deserialize(black_box(&xml), Arc::clone(&schema)).unwrap();
+                black_box(res);
+            });
+        });
+    }
+
+    group.finish();
+}
+
+fn bench_serialization(c: &mut Criterion) {
+    let mut group = c.benchmark_group("serialization");
+
+    // 1. Sensor Telemetry (Micro)
+    {
+        let (schema, xml) = build_sensor_fixture();
+        let val = deserialize(&xml, Arc::clone(&schema)).unwrap();
+        let expected_bytes = serialize("Sensor", &val, &schema, None).unwrap();
+        group.throughput(Throughput::Bytes(expected_bytes.len() as u64));
+        group.bench_function("sensor_micro", |b| {
+            b.iter(|| {
+                let res = serialize(
+                    black_box("Sensor"),
+                    black_box(&val),
+                    black_box(&schema),
+                    black_box(None),
+                )
+                .unwrap();
+                black_box(res);
+            });
+        });
+    }
+
+    // 2. Catalog Batch (1,000 and 10,000 items)
+    for &count in &[1_000, 10_000] {
+        let (schema, xml) = build_catalog_fixture(count);
+        let val = deserialize(&xml, Arc::clone(&schema)).unwrap();
+        let expected_bytes = serialize("Catalog", &val, &schema, None).unwrap();
+        group.throughput(Throughput::Bytes(expected_bytes.len() as u64));
+        group.bench_with_input(BenchmarkId::new("catalog_items", count), &count, |b, _| {
+            b.iter(|| {
+                let res = serialize(
+                    black_box("Catalog"),
+                    black_box(&val),
+                    black_box(&schema),
+                    black_box(None),
+                )
+                .unwrap();
+                black_box(res);
+            });
+        });
+    }
+
+    group.finish();
+}
+
+criterion_group!(benches, bench_deserialization, bench_serialization);
+criterion_main!(benches);
diff --git a/research/data/runtime-followups-2026-10-03/integration/core/metadata.json b/research/data/runtime-followups-2026-10-03/integration/core/metadata.json
new file mode 100644
index 0000000..d094202
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/integration/core/metadata.json
@@ -0,0 +1,19 @@
+{
+  "revisions": {
+    "baseline": "1819c91b0808b9242c642d82350d2b657b60108c",
+    "current": "71aff6ca6cbe7106dcc2389a2428571a16d69430"
+  },
+  "core_status": {
+    "baseline": "",
+    "current": ""
+  },
+  "sample_size": 100,
+  "warmup_seconds": 3.0,
+  "measurement_seconds": 5.0,
+  "rounds": 3,
+  "filter": "",
+  "order": "alternate baseline/current per round",
+  "os": "Linux-6.18.40.1-microsoft-standard-WSL2-x86_64-with-glibc2.43",
+  "cpu": "11th Gen Intel(R) Core(TM) i5-11600K @ 3.90GHz",
+  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)\nbinary: rustc\ncommit-hash: b940084d7eb6a299eb4bfeb8e34901bc051e7ac4\ncommit-date: 2026-09-28\nhost: x86_64-unknown-linux-gnu\nrelease: 1.99.0\nLLVM version: 23.1.1\n"
+}
diff --git a/research/data/runtime-followups-2026-10-03/integration/core/summary.json b/research/data/runtime-followups-2026-10-03/integration/core/summary.json
new file mode 100644
index 0000000..5bbe54c
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/integration/core/summary.json
@@ -0,0 +1,428 @@
+{
+  "deserialization/catalog_items/1000": {
+    "baseline_ns": 793776.1547830481,
+    "candidate_ns": 791796.522976454,
+    "delta_percent": -0.2493942145610495,
+    "speedup": 1.0025001774435083,
+    "process_deltas_percent": [
+      -0.10617011466900195,
+      -0.3123421672583504,
+      -0.779663933768382
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 788585.4450922838,
+            "upper_bound": 797473.1987078039
+          },
+          "point_estimate": 792727.1514495687,
+          "standard_error": 2278.9180674776308
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 789558.6336819933,
+            "upper_bound": 798431.9082832345
+          },
+          "point_estimate": 793776.1547830481,
+          "standard_error": 2264.4295435361896
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 792468.9140329257,
+            "upper_bound": 804890.6113519707
+          },
+          "point_estimate": 798018.3845052827,
+          "standard_error": 3183.9102623588506
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 786346.0651920197,
+            "upper_bound": 799852.6634020013
+          },
+          "point_estimate": 791885.5121238624,
+          "standard_error": 3521.7185596940394
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 786958.4013295003,
+            "upper_bound": 796765.1371311566
+          },
+          "point_estimate": 791296.8571380187,
+          "standard_error": 2519.108473861213
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 787289.5092346176,
+            "upper_bound": 796907.6392526638
+          },
+          "point_estimate": 791796.522976454,
+          "standard_error": 2452.7913055432136
+        }
+      ]
+    }
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diff --git a/research/data/runtime-followups-2026-10-03/integration/corpus-comparison.json b/research/data/runtime-followups-2026-10-03/integration/corpus-comparison.json
new file mode 100644
index 0000000..7ff6421
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/integration/corpus-comparison.json
@@ -0,0 +1,11 @@
+{
+  "CType": {
+    "identical_summary_and_failures": true
+  },
+  "AttrDecl": {
+    "identical_summary_and_failures": true
+  },
+  "NIST": {
+    "identical_summary_and_failures": true
+  }
+}
diff --git a/research/data/runtime-followups-2026-10-03/integration/gate.log b/research/data/runtime-followups-2026-10-03/integration/gate.log
new file mode 100644
index 0000000..04b1002
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/integration/gate.log
@@ -0,0 +1,1024 @@
+memcap: <=7714 MiB (60% of 12857 MiB available) [systemd MemoryMax, swap off]
+==> [1/6] Running Rust format check (cargo fmt)...
+==> [2/6] Running Rust Clippy (cargo clippy -D warnings)...
+   Compiling unicode-ident v1.0.24
+   Compiling proc-macro2 v1.0.107
+   Compiling quote v1.0.47
+   Compiling syn v3.0.5
+   Compiling serde_core v1.0.229
+   Compiling serde v1.0.229
+    Checking memchr v2.8.3
+   Compiling serde_derive v1.0.229
+   Compiling syn v2.0.119
+   Compiling zmij v1.0.23
+    Checking lexical-util v1.0.7
+   Compiling serde_json v1.0.151
+    Checking siphasher v1.0.3
+    Checking phf_shared v0.14.0
+    Checking aho-corasick v1.1.5
+    Checking regex-syntax v0.8.11
+    Checking fastrand v2.5.0
+    Checking itoa v1.0.18
+    Checking regex-automata v0.4.18
+    Checking lexical-write-integer v1.0.6
+    Checking lexical-parse-integer v1.0.6
+   Compiling thiserror v2.0.21
+    Checking lexical-parse-float v1.0.6
+    Checking lexical-write-float v1.0.6
+    Checking regex v1.13.1
+    Checking phf_generator v0.14.0
+   Compiling thiserror-impl v2.0.21
+    Checking memo-map v0.3.4
+    Checking minijinja v2.24.0
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+    Checking lexical-core v1.0.6
+    Checking quick-xml v0.42.0
+    Checking smallvec v1.16.2
+    Checking heck v0.5.0
+   Compiling libc v0.2.189
+    Checking once_cell v1.21.4
+    Checking polyxml v0.34.6 (/home/bailey/github/polyxml-runtime-integration/crates/polyxml-core)
+    Checking cfg-if v1.0.4
+    Checking utf8parse v0.2.2
+    Checking anstyle-parse v1.0.0
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+    Checking clap_lex v1.1.0
+    Checking clap_builder v4.6.7
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+   Compiling getrandom v0.4.3
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+   Compiling convert_case v0.6.0
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+   Compiling pyo3-macros v0.29.2
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+    Finished `dev` profile [unoptimized + debuginfo] target(s) in 47.42s
+==> [3/6] Running Rust workspace tests (cargo test)...
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+   Compiling quote v1.0.47
+   Compiling syn v3.0.5
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+   Compiling lexical-parse-integer v1.0.6
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+   Compiling once_cell v1.21.4
+   Compiling lexical-write-float v1.0.6
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+   Compiling thiserror-impl v2.0.21
+   Compiling memo-map v0.3.4
+   Compiling minijinja v2.24.0
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+   Compiling lexical-core v1.0.6
+   Compiling quick-xml v0.42.0
+   Compiling smallvec v1.16.2
+   Compiling libc v0.2.189
+   Compiling polyxml v0.34.6 (/home/bailey/github/polyxml-runtime-integration/crates/polyxml-core)
+   Compiling utf8parse v0.2.2
+   Compiling anstyle-parse v1.0.0
+   Compiling anstyle v1.0.14
+   Compiling is_terminal_polyfill v1.70.2
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+   Compiling anstyle-query v1.1.5
+   Compiling anstream v1.0.0
+   Compiling strsim v0.11.1
+   Compiling clap_lex v1.1.0
+   Compiling clap_builder v4.6.7
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+   Compiling bitflags v2.13.2
+   Compiling clap v4.6.7
+   Compiling linux-raw-sys v0.12.1
+   Compiling rustix v1.1.5
+   Compiling getrandom v0.4.3
+   Compiling zerocopy-derive v0.8.57
+   Compiling zerocopy v0.8.57
+   Compiling tempfile v3.27.0
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+   Compiling either v1.18.0
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+   Compiling cast v0.3.0
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+   Compiling walkdir v2.5.0
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+   Compiling ciborium v0.2.2
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+   Compiling oorandom v11.1.5
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+   Compiling diff v0.1.13
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+   Compiling criterion v0.8.2
+   Compiling pretty_assertions v1.4.1
+   Compiling phf v0.14.0
+   Compiling winnow v1.0.4
+   Compiling toml_parser v1.1.3+spec-1.1.0
+   Compiling toml_datetime v1.1.1+spec-1.1.0
+   Compiling serde_spanned v1.1.1
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+   Compiling toml v1.1.6+spec-1.1.0
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+   Compiling wasm-bindgen-macro v0.2.129
+   Compiling polyxml-cli v0.34.6 (/home/bailey/github/polyxml-runtime-integration/crates/polyxml-cli)
+   Compiling wasm-bindgen v0.2.129
+   Compiling pyo3-macros-backend v0.29.2
+   Compiling polyxml-js v0.34.6 (/home/bailey/github/polyxml-runtime-integration/crates/polyxml-js)
+   Compiling napi-derive-backend v1.0.75
+   Compiling pyo3-macros v0.29.2
+   Compiling pyo3-ffi v0.29.2
+   Compiling ctor v0.2.9
+   Compiling napi-sys v2.4.0
+   Compiling napi v2.16.17
+   Compiling pyo3 v0.29.2
+   Compiling napi-derive v2.16.13
+   Compiling polyxml-wasm v0.34.6 (/home/bailey/github/polyxml-runtime-integration/crates/polyxml-wasm)
+   Compiling polyxml-python v0.34.6 (/home/bailey/github/polyxml-runtime-integration/crates/polyxml-python)
+   Compiling polyxml-c v0.34.6 (/home/bailey/github/polyxml-runtime-integration/crates/polyxml-c)
+    Finished `test` profile [unoptimized + debuginfo] target(s) in 1m 23s
+     Running unittests src/lib.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/polyxml-675b717e531d04ed)
+
+running 16 tests
+test integer::tests::comparison_uses_sign_and_magnitude ... ok
+test ir::chunker::tests::test_topological_scc_chunking_dag_invariants ... ok
+test ir::root_selection_tests::inherited_base_does_not_select_sibling_types ... ok
+test json::tests::test_json_deserialization_accepts_python_field_names ... ok
+test ir::root_selection_tests::rejects_missing_and_ambiguous_roots ... ok
+test ir::root_selection_tests::keeps_references_descendants_and_substitutions ... ok
+test json::tests::test_json_roundtrip_primitives ... ok
+test tests::test_deserialization_does_not_confuse_xmlns_with_attributes ... ok
+test tests::test_nested_elements_and_lists ... ok
+test tests::test_roundtrip_serialization_deserialization ... ok
+test tests::test_namespaced_serialization ... ok
+test tests::test_streaming_xml_item_stream ... ok
+test ir::root_selection_tests::field_reference_keeps_substitution_group_members ... ok
+test pattern::tests::bounded_cache_evicts_and_retains_invalid_results ... ok
+test pattern::tests::cache_matches_uncached_regex_under_churn_and_concurrency ... ok
+test pattern::tests::cyclic_working_set_above_capacity_keeps_reusing_entries ... ok
+
+test result: ok. 16 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.14s
+
+     Running tests/test_adversarial_identifiers.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_adversarial_identifiers-34056256ccaa17cb)
+
+running 7 tests
+test test_rust_adversarial_compilation ... ok
+test test_python_adversarial_compilation ... ok
+test test_cpp_adversarial_compilation ... ok
+test test_go_adversarial_compilation ... ok
+test test_java_adversarial_compilation ... ok
+test test_typescript_adversarial_compilation ... ok
+test test_csharp_adversarial_compilation ... ok
+
+test result: ok. 7 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 3.34s
+
+     Running tests/test_any_attribute.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_any_attribute-d5795d9c5e0fdefd)
+
+running 1 test
+test test_any_attribute_schema_parser_and_runtime_roundtrip ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_any_element.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_any_element-1fb225d6616938e8)
+
+running 2 tests
+test test_any_element_go_codegen ... ok
+test test_any_element_schema_parser_and_runtime_roundtrip ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_conformance.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_conformance-0b37810d65fedfce)
+
+running 4 tests
+test test_soap_envelope_conformance ... ok
+test test_ubl_invoice_conformance ... ok
+test test_atom_feed_conformance ... ok
+test test_streaming_catalog_conformance ... ok
+
+test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
+
+     Running tests/test_core.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_core-f4cc1079f88df2bc)
+
+running 9 tests
+test integer_mappings_keep_fixed_width_builtins ... ok
+test test_malformed_xml_syntax_error ... ok
+test test_all_scalar_types ... ok
+test test_gregorian_partial_date_lexical_validation ... ok
+test test_error_handling_invalid_scalars ... ok
+test test_xsi_nil_handling ... ok
+test test_roundtrip_serialization_with_indentation ... ok
+test unbounded_integers_round_trip_and_compare_exact_bounds ... ok
+test test_xsd_gregorian_fields_round_trip_and_reject_invalid_dates ... ok
+
+test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_cpp_codegen.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_cpp_codegen-a4cd5571504c64d5)
+
+running 14 tests
+test test_cpp_cmake_and_meson_generation ... ok
+test simple_aliases_follow_their_base_types ... ok
+test test_cpp_cmake_modules_file_set ... ok
+test test_cpp_mode_and_backend_from_str_loose ... ok
+test test_cpp_glaze_backend_meta_generation ... ok
+test test_cpp_sanitization ... ok
+test mixed_content_self_cycle_compiles ... ok
+test mixed_content_mutual_cycle_compiles ... ok
+Inheritance test passed.
+test test_cpp_inheritance_codegen ... ok
+Recursive tree unique_ptr passed.
+test test_cpp_recursive_cycle_unique_ptr ... ok
+All C++20 tests passed successfully.
+test test_cpp_struct_and_enum_codegen_compilation ... ok
+Choice pattern matching passed.
+test test_cpp_choice_variant_compilation ... ok
+test test_cpp_modules_compilation ... ok
+ISO 20022 pacs.008 C++20 test passed.
+test test_cpp_from_xsd_schema ... ok
+
+test result: ok. 14 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.87s
+
+     Running tests/test_csharp_codegen.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_csharp_codegen-cf32febf6e7f0777)
+
+running 20 tests
+test choice_variants_avoid_record_member_names ... ok
+test emits_unrestricted_simple_types_and_validates_empty_records ... ok
+test test_csharp_any_attribute_codegen ... ok
+test test_csharp_record_kind_from_str_loose ... ok
+test test_csharp_sanitization ... ok
+test test_csharp_date_or_datetime_lexical_union ... ok
+test test_csharp_sequence_nested_inside_choice_codegen ... ok
+test test_csharp_source_gen_context ... ok
+test unbounded_integer_xml_preserves_digits ... ok
+  Determining projects to restore...
+  Restored /tmp/.tmp3pihDy/PaymentsApp.csproj (in 167 ms).
+  PaymentsApp -> /tmp/.tmp3pihDy/bin/Debug/net8.0/PaymentsApp.dll
+
+Build succeeded.
+    0 Warning(s)
+    0 Error(s)
+
+Time Elapsed 00:00:01.05
+Choice pattern matching and XML serialization passed!
+test test_csharp_choice_polymorphic_hierarchy ... ok
+  Determining projects to restore...
+  Restored /tmp/.tmpX90gkz/TreeApp.csproj (in 167 ms).
+  TreeApp -> /tmp/.tmpX90gkz/bin/Debug/net8.0/TreeApp.dll
+
+Build succeeded.
+    0 Warning(s)
+    0 Error(s)
+
+Time Elapsed 00:00:01.08
+Recursive tree C# tests passed cleanly!
+test test_csharp_recursive_cycle ... ok
+  Determining projects to restore...
+  Restored /tmp/.tmpiAVmtw/CrmApp.csproj (in 166 ms).
+  CrmApp -> /tmp/.tmpiAVmtw/bin/Debug/net8.0/CrmApp.dll
+
+Build succeeded.
+    0 Warning(s)
+    0 Error(s)
+
+Time Elapsed 00:00:01.04
+Customer C# tests passed cleanly!
+test test_csharp_records_and_enums_generation ... ok
+test test_csharp_mutable_inheritance_roundtrip ... ok
+test test_csharp_mutable_wrappers_and_choices_without_validation ... ok
+test test_csharp_simple_content_class_validator_and_unsealed_records ... ok
+test fixed_values_are_enforced_on_read_and_write ... ok
+test element_defaults_preserve_absence_and_empty_presence ... ok
+test lexical_union_attributes_round_trip ... ok
+test nillable_enum_collection_round_trips ... ok
+test particle_wire_structure_round_trips ... ok
+
+test result: ok. 20 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 50.57s
+
+     Running tests/test_default_literal_codegen.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_default_literal_codegen-4c3562e7020c30db)
+
+running 1 test
+test generated_string_defaults_and_fixed_values_preserve_xml_characters ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 1.94s
+
+     Running tests/test_enum_literal_codegen.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_enum_literal_codegen-0c92c71c8d4587d6)
+
+running 1 test
+test enum_literals_compile_and_preserve_values_in_all_seven_languages ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 27.02s
+
+     Running tests/test_go_codegen.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_go_codegen-005c45ed4341be87)
+
+running 25 tests
+test referenced_element_uses_declared_type_after_includes ... ok
+test root_alias_names_are_unique_after_go_normalization ... ok
+test test_go_any_attribute_codegen ... ok
+test test_go_backend_from_str_loose ... ok
+go: creating new go.mod: module payments
+go: to add module requirements and sums:
+	go mod tidy
+test imported_ordered_types_do_not_add_unused_bytes_import ... ok
+test test_go_date_or_datetime_lexical_union ... ok
+test test_go_easyjson_backend ... ok
+test test_go_enum_only_schema_omits_unused_xml_import ... ok
+test roots_and_union_attributes_round_trip ... ok
+go: creating new go.mod: module tree
+go: to add module requirements and sums:
+	go mod tidy
+test separate_choices_enforce_each_group ... ok
+test test_go_sanitization ... ok
+test test_go_sonic_backend ... ok
+go: creating new go.mod: module crm
+go: to add module requirements and sums:
+	go mod tidy
+test abstract_substitution_heads_are_rejected ... ok
+test test_go_abstract_xsi_type_dispatch ... ok
+test nested_lexical_unions_compile_and_round_trip_in_go ... ok
+test duplicate_choice_names_reject_invalid_branch_shapes ... ok
+test repeated_sequence_groups_enforce_bounds_and_order ... ok
+=== RUN   TestChoiceMutualExclusivity
+    payments_test.go:44: Correctly rejected concurrent choice branches: choice ContactChoice mutual exclusivity violation: multiple branches populated (2)
+--- PASS: TestChoiceMutualExclusivity (0.00s)
+PASS
+ok  	payments	0.009s
+test test_go_choice_mutual_exclusivity ... ok
+test repeated_choice_branch_rejects_mixed_and_empty_selections ... ok
+test temporal_scalars_preserve_xsd_lexical_values ... ok
+test test_go_namespaced_element_ref_matching ... ok
+=== RUN   TestRecursiveTree
+--- PASS: TestRecursiveTree (0.00s)
+PASS
+ok  	tree	0.003s
+test test_go_recursive_cycle_pointers ... ok
+=== RUN   TestCustomerRoundtrip
+--- PASS: TestCustomerRoundtrip (0.00s)
+PASS
+ok  	crm	0.002s
+test test_go_struct_and_enum_generation ... ok
+test unbounded_integer_xml_preserves_digits ... ok
+test ordered_particles_and_choice_branches_round_trip ... ok
+
+test result: ok. 25 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 1.00s
+
+     Running tests/test_java_codegen.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_java_codegen-a6078e165fc64681)
+
+running 17 tests
+test test_java_jackson_backend_from_str_loose ... ok
+test test_java_identifier_sanitization ... ok
+test test_java_jackson_backend_enum_annotations ... ok
+test test_java_jackson_backend_simple_type_annotations ... ok
+test test_direct_codec_rejects_wildcards_and_name_collisions ... ok
+test test_java_bean_validation_annotations_are_opt_in ... ok
+test test_java_jackson_backend_union_annotations ... ok
+test test_java_jackson_backend_struct_annotations ... ok
+test test_java_plain_record_inlines_base_fields ... ok
+test jackson3_preserves_core_annotations_and_maps_record_text ... ok
+test test_java_sealed_interface_choice ... ok
+test test_java_module_container_class ... ok
+test test_java_records_and_enums_generation ... ok
+test test_java_plain_record_extension_javac_execute ... ok
+test test_java_record_builder_and_nested_codec_execute ... ok
+test test_java_mutable_builders_and_direct_codecs_execute ... ok
+test test_java_direct_nil_lists_choices_and_namespaces ... ok
+
+test result: ok. 17 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 2.44s
+
+     Running tests/test_json.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_json-74440efee0e911e7)
+
+running 4 tests
+test test_polyvalue_direct_json_methods ... ok
+test test_json_scalar_coercion ... ok
+test test_json_nested_objects_and_lists ... ok
+test test_json_primitives_and_alias_modes ... ok
+
+test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_lexical_lists.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_lexical_lists-0f6750d9c4bf9a3c)
+
+running 2 tests
+test named_list_items_enforce_facets_and_enumerations ... ok
+test typed_lexical_lists_round_trip_across_codecs ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 3.38s
+
+     Running tests/test_lexical_union_codegen.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_lexical_union_codegen-3c208893561d2732)
+
+running 2 tests
+test lexical_union_xml_selects_first_valid_member_and_round_trips ... ok
+test lexical_unions_are_typed_in_all_targets ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_mixed_branch_lookup.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_mixed_branch_lookup-b361da17b3391045)
+
+running 1 test
+test large_mixed_tables_keep_first_match_metadata_edits_records_and_nil ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
+
+     Running tests/test_mixed_content.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_mixed_content-1a697ad935ae2797)
+
+running 5 tests
+test mixed_items_field_avoids_existing_attribute_name ... ok
+test parser_builds_ordered_mixed_content_union ... ok
+test mixed_content_preserves_nested_child_order ... ok
+test mixed_content_preserves_text_and_child_order ... ok
+test generated_models_keep_typed_content_items_in_all_targets ... ok
+
+test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_mixed_nil.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_mixed_nil-9410990f6ba737b9)
+
+running 2 tests
+test nil_scalar_and_nested_items_keep_order_and_differ_from_empty_strings ... ok
+test nil_instance_prefix_does_not_rebind_the_element_namespace ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_namespace_entities.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_namespace_entities-4c617e2673a7b703)
+
+running 4 tests
+test namespace_entity_values_are_decoded_once ... ok
+test undefined_entities_cannot_form_namespace_bindings ... ok
+test entity_decoding_applies_to_inherited_and_local_xsi_type_bindings ... ok
+test escaped_namespace_bindings_match_strict_root_and_round_trip ... ok
+
+test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_pattern_codegen.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_pattern_codegen-5eee5f9fe2ed3d1a)
+
+running 9 tests
+test generated_typescript_pattern_validation_all_backends ... ok
+test pattern_restrictions_preserve_or_groups_and_inherited_and_steps ... ok
+test gregorian_primitives_emit_validated_types_across_targets ... ok
+test generated_python_pattern_validation ... ok
+test generated_go_pattern_validation_and_xml_roundtrip ... ok
+test generated_java_pattern_validation_and_direct_codecs ... ok
+test generated_cpp_pattern_validation ... ok
+test generated_csharp_pattern_validation ... ok
+test generated_rust_pattern_validation_and_xml_roundtrip ... ok
+
+test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 24.60s
+
+     Running tests/test_python_codegen.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_python_codegen-cc734e908fb39fb6)
+
+running 16 tests
+test test_identifier_sanitization ... ok
+test test_python_abstract_meta_emission ... ok
+test multiline_xsd_documentation_stays_inside_python_comments ... ok
+test test_python_any_attribute_codegen ... ok
+test test_python_choice_union_codegen ... ok
+test test_python_dataclass_codegen ... ok
+test test_python_codecs_generation ... ok
+test test_python_generated_tag_and_custom_header ... ok
+test test_python_aot_codegen ... ok
+test test_python_pydantic_codegen_with_facets ... ok
+test test_python_recursive_type_codegen ... ok
+test test_python_any_element_codegen ... ok
+test test_python_derived_meta_inheritance ... ok
+test test_python_simplecontent_default_factory ... ok
+test test_python_sequence_nested_inside_choice_codegen ... ok
+test quoted_docstrings_preserve_text_and_remain_valid_python ... ok
+
+test result: ok. 16 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.04s
+
+     Running tests/test_qualified_attributes.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_qualified_attributes-f8397a31cf1ecf15)
+
+running 5 tests
+test global_attribute_references_round_trip_by_namespace ... ok
+test imported_inline_global_attribute_enum_round_trips ... ok
+test derived_validators_preserve_base_constraints ... ok
+test lexical_dependencies_compile_and_round_trip_without_implicit_imports ... ok
+test inherited_attribute_and_distinct_element_keep_separate_property_names ... ok
+
+test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 8.12s
+
+     Running tests/test_runtime_fast_paths.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_runtime_fast_paths-7bf9091b7252b7db)
+
+running 6 tests
+test repeated_lexical_lists_keep_whitespace_validation ... ok
+test repeated_nested_records_validate_their_own_lexical_lists ... ok
+test lexical_list_formatting_preserves_escaping_empty_lists_and_long_numbers ... ok
+test indexed_scalar_state_preserves_enum_pattern_and_split_text ... ok
+test cached_patterns_keep_raw_restriction_and_trimmed_pattern_semantics ... ok
+test unified_scalar_state_keeps_mixed_branch_order_nil_and_nested_frames ... ok
+
+test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_rust_codecs.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_rust_codecs-9692e165bd5e14bf)
+
+running 4 tests
+test test_facet_validation_min_max_length ... ok
+test test_order_choice_roundtrip ... ok
+test test_recursive_boxing_roundtrip ... ok
+test test_empty_element_codec ... ok
+
+test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_rust_codegen.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_rust_codegen-8bce8b4b67c7eca3)
+
+running 26 tests
+test test_rust_attribute_codec_loop_syntax ... ok
+test multiline_docs_and_raw_field_names_are_valid_source ... ok
+test test_rust_choice_union_codegen ... ok
+test test_rust_extension_base_cycle_cut ... ok
+test test_rust_identifier_sanitization ... ok
+test test_rust_codecs_codegen ... ok
+test test_rust_enum_and_methods ... ok
+test test_rust_owned_codegen ... ok
+test test_rust_phf_dispatch_union_groups_branch_tags ... ok
+test test_rust_extension_inlines_base_fields ... ok
+test test_rust_extension_codecs_decode_and_encode_base_fields ... ok
+test test_rust_digit_prefixed_module_sanitization ... ok
+test test_rust_phf_dispatch_uniquifies_like_field_metas ... ok
+test test_rust_rkyv_derives ... ok
+test test_rust_recursive_cycle_boxing ... ok
+test test_rust_simple_content_extension_shadow_rule ... ok
+test test_rust_phf_dispatch_emission ... ok
+test test_rust_read_element_text_accumulates_refs_and_cdata ... ok
+test test_rust_simple_content_text_codec ... ok
+test test_rust_simple_type_cycle_resilience ... ok
+test test_rust_zero_copy_codegen ... ok
+test test_rust_topological_scc_chunking ... ok
+test binary_lexical_values_compile_and_round_trip_in_owned_and_borrowed_modes ... ok
+test duplicate_wire_names_keep_distinct_json_values ... ok
+test empty_modules_compile_without_unused_reexports ... ok
+test named_choice_wrappers_round_trip_without_unreachable_dispatch ... ok
+
+test result: ok. 26 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 59.11s
+
+     Running tests/test_schema_attribute_entities.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_schema_attribute_entities-ce76904e09cb1816)
+
+running 4 tests
+test malformed_attributes_and_undefined_entities_are_errors_even_in_skipped_content ... ok
+test literal_attribute_whitespace_is_normalized_but_character_references_survive ... ok
+test namespace_and_qname_attributes_are_normalized_consistently ... ok
+test attribute_entities_reach_enum_facets_and_defaults_in_value_space ... ok
+
+test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_schema_audit.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_schema_audit-24992dfb5b4a626c)
+
+running 13 tests
+test distinct_values_with_colliding_variant_names_stay_unique ... ok
+test duplicate_enumeration_values_are_deduped ... ok
+test derived_simple_type_inherits_base_patterns ... ok
+test generated_rust_has_no_deny_unknown_fields ... ok
+test quick_xml_serde_skips_unknown_elements ... ok
+test named_group_reference_fields_are_parsed ... ok
+test all_languages_disambiguate_flat_collision ... ok
+test nested_inline_complex_type_is_extracted_not_leaked ... ok
+test chameleon_include_adopts_including_namespace_per_includer ... ok
+test rust_flat_output_has_no_colliding_type_names ... ok
+test simple_content_extension_emits_value_field ... ok
+test restricted_simple_types_emit_named_aliases ... ok
+test diamond_includes_do_not_duplicate_upa_source_documents ... ok
+
+test result: ok. 13 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
+
+     Running tests/test_schema_ir.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_schema_ir-f793c1b9895343c7)
+
+running 20 tests
+test missing_included_schema_is_an_error ... ok
+test global_attribute_reference_uses_declared_type ... ok
+test consumed_child_subtrees_do_not_swallow_following_types ... ok
+test test_list_fields_do_not_trigger_spurious_cycles ... ok
+test consumed_particles_do_not_swallow_following_declarations ... ok
+test schema_errors_preserve_forward_imports_and_annotation_payloads ... ok
+test derived_complex_type_keeps_base_and_bounded_choice ... ok
+test test_language_context_adapter ... ok
+test test_tarjan_mutual_recursive_cycle_detection_and_boxing ... ok
+test test_parse_lexical_union_member_types_and_inline_members ... ok
+test inline_list_item_types_preserve_enum_and_union_declarations ... ok
+test test_minijinja_template_engine_and_filters ... ok
+test test_substitution_groups ... ok
+test schema_for_schemas_declared_types_are_not_unknown_builtins ... ok
+test test_tarjan_self_recursive_cycle_detection_and_boxing ... ok
+test imported_inline_global_attribute_types_are_resolved ... ok
+test xml_prefix_is_available_without_explicit_declaration ... ok
+test test_sequence_nested_inside_choice_preserved_in_ir ... ok
+test test_parse_choice_as_union ... ok
+test test_parse_complex_type_and_facets ... ok
+
+test result: ok. 20 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_security.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_security-c3afa670f1d6c619)
+
+running 6 tests
+test test_cdata_section_handling ... ok
+test test_numeric_character_references ... ok
+test unsupported_general_entities_are_rejected ... ok
+test test_malformed_unclosed_cdata_rejection ... ok
+test test_xml_entity_roundtrip_escaping ... ok
+test test_max_depth_recursion_limit ... ok
+
+test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_temporal_union.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_temporal_union-e25d1f9b83e2fdc4)
+
+running 2 tests
+test go_temporal_union_preserves_branches_and_lexicals ... ok
+test csharp_temporal_union_preserves_branches_and_lexicals ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 3.05s
+
+     Running tests/test_transcoder.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_transcoder-6854114408316a2e)
+
+running 6 tests
+test test_schemaless_preserves_refs_cdata_and_attr_entities ... ok
+test test_schemaless_pretty_transcoding ... ok
+test test_schema_directed_transcoding ... ok
+test test_transcoder_errors ... ok
+test test_schemaless_xml_to_json_and_back ... ok
+test test_schema_from_ir_transcoding ... ok
+
+test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_ts_codegen.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_ts_codegen-4e67290c9758f4d9)
+
+running 9 tests
+test test_ts_backend_from_str_loose ... ok
+test test_ts_identifier_sanitization ... ok
+test test_ts_recursive_cycle_zod_lazy ... ok
+test test_ts_discriminated_union_choice ... ok
+test test_ts_interface_and_enum_codegen ... ok
+test test_ts_typebox_schema_generation ... ok
+test test_ts_zod_schema_generation ... ok
+test test_ts_valibot_schema_generation ... ok
+test mixed_content_inheritance_compiles_with_widened_items ... ok
+
+test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.32s
+
+     Running tests/test_ubl_csharp.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_ubl_csharp-b04bc8d2d5f891c2)
+
+running 2 tests
+test unprefixed_xsd_builtin_simple_content_base_uses_default_namespace ... ok
+test multi_namespace_roots_and_inherited_simple_content_compile_and_round_trip ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 2.96s
+
+     Running tests/test_unbounded_choice.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_unbounded_choice-7672e62aa5ecca1a)
+
+running 1 test
+go: creating new go.mod: module testmod
+go: to add module requirements and sums:
+	go mod tidy
+=== RUN   TestUnboundedChoiceOrder
+--- PASS: TestUnboundedChoiceOrder (0.00s)
+PASS
+ok  	testmod	0.002s
+test test_unbounded_choice_ir_and_all_targets ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.14s
+
+     Running tests/test_upa.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_upa-a20019d257c7eac5)
+
+running 6 tests
+test local_form_and_in_scope_qnames_distinguish_namespaces ... ok
+test model_groups_derivation_and_substitution_members_are_checked ... ok
+test optional_siblings_and_choice_lookahead_violate_upa ... ok
+test all_groups_and_wildcard_namespaces_are_checked ... ok
+test imported_groups_and_chameleon_wildcards_keep_source_namespaces ... ok
+test occurrence_ranges_keep_particle_identity_and_count_boundaries ... ok
+
+test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_value_constraints.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_value_constraints-73eb81a96de588c1)
+
+running 2 tests
+test fixed_constraints_cover_input_and_output_in_value_space ... ok
+test repeated_particle_cardinality_belongs_to_the_group ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_xsi_type.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_xsi_type-2c07a0776bd0ec60)
+
+running 11 tests
+test abstract_type_without_derivations_errors ... ok
+test plain_type_attribute_is_not_mistaken_for_dispatch ... ok
+test from_ir_flattens_base_fields_and_registers_variants ... ok
+test iterparse_dispatches_each_streamed_item ... ok
+test abstract_type_requires_concrete_selector ... ok
+test nested_xsi_type_dispatch_and_round_trip ... ok
+test nil_abstract_complex_type_skips_concrete_dispatch ... ok
+test variant_serialization_requires_namespaces ... ok
+test unknown_xsi_type_on_abstract_type_errors ... ok
+test root_xsi_type_dispatch_including_empty_element ... ok
+test xsi_type_resolves_namespace_inherited_from_parent ... ok
+
+test result: ok. 11 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running unittests src/lib.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/polyxml-4ccc220bbd6a27a0)
+
+running 2 tests
+test tests::test_c_abi_namespaced_roundtrip ... ok
+test tests::test_c_abi_nested_list_batch_roundtrip ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running unittests src/lib.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/polyxml_cli-dabf613ae4318f1b)
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running unittests src/main.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/polyxml-cec02944de7101b9)
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_cli.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/test_cli-714ccf0c30d96734)
+
+running 47 tests
+test fish_completion_filters_values_when_available ... ok
+Loading manifest: /tmp/.tmpQZsl4P/polyxml.toml
+Compiling schema: /tmp/.tmpQZsl4P/model.xsd
+test manifest_generation_does_not_ignore_cli_overrides ... ok
+  Namespace: urn:app
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Emitting target [csharp] into /tmp/.tmpQZsl4P/cs
+Emitting target [ts] into /tmp/.tmpQZsl4P/ts
+Emitting target [go] into /tmp/.tmpQZsl4P/go
+Parsing schema: /tmp/.tmpu5jAKI/customer.xsd
+Emitting target [rust] into /tmp/.tmpQZsl4P/rs
+Build finished successfully.
+  Namespace: urn:crm
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+test test_cli_csharp_source_gen_and_record_struct ... ok
+test test_cli_build_polyxml_manifest_with_new_features ... ok
+test test_cli_cpp_modules_and_glaze ... ok
+test test_cli_generate_custom_header_and_generated_tags ... ok
+test jackson3_cli_and_manifest_emit_equivalent_models ... ok
+test test_cli_generate_dry_run ... ok
+test python_features_respect_manifest_false_values_and_backend ... ok
+test test_cli_generate_multi_lang ... ok
+test imported_substitution_helpers_do_not_require_spurious_module_owners ... ok
+Parsing schema: /tmp/.tmpS6nVhg/service.xsd
+  Namespace: urn:service
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+test test_cli_help ... ok
+test test_cli_generate_help ... ok
+Loading manifest: /tmp/.tmp3XUVGN/polyxml.toml
+Parsing schema: /tmp/.tmpS6nVhg/service.xsd
+Compiling schema: /tmp/.tmp3XUVGN/schema.xsd
+  Namespace: urn:service
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Emitting target [rust] into /tmp/.tmp3XUVGN/rs
+Emitting target [go] into /tmp/.tmp3XUVGN/go
+Emitting target [csharp] into /tmp/.tmp3XUVGN/cs
+Build finished successfully.
+test test_cli_go_easyjson_and_sonic_backend ... ok
+test test_cli_generate_rust_zero_copy_and_owned ... ok
+test test_cli_manifest_custom_header_workspace_and_target_override ... ok
+test retained_imported_ordered_helpers_belong_to_the_unique_namespace_module ... ok
+test test_cli_generate_python_backends ... ok
+test test_cli_python_aot_generation ... ok
+go: creating new go.mod: module crm
+go: to add module requirements and sums:
+	go mod tidy
+Parsing schema: /tmp/.tmpDTzmRY/event.xsd
+test test_cli_python_aot_rejects_dataclass_style_and_slots ... ok
+Parsing schema: /tmp/.tmpDxFtAZ/event.xsd
+  Namespace: urn:events
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+  Namespace: urn:events
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+test completion_candidates_follow_target_validation ... ok
+Code generation complete.
+Code generation complete.
+test test_cli_rust_rkyv_feature ... ok
+test test_cli_rust_phf_feature ... ok
+test test_cli_multiple_root_element_selection ... ok
+Parsing schema: /tmp/.tmpLCPO0e/item.xsd
+  Namespace: urn:store
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+test invalid_schema_grammar_and_types_fail_before_generation ... ok
+Parsing schema: /tmp/.tmpLCPO0e/item.xsd
+  Namespace: urn:store
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+test test_cli_transcode_bidirectional ... ok
+test test_cli_typescript_valibot_and_typebox_backend ... ok
+test bash_completion_filters_values_in_the_shell ... ok
+test test_cli_validate_valid_and_invalid ... ok
+test test_root_selection_keeps_imported_module_types ... ok
+test unified_help_shows_generation_options ... ok
+test test_polyxml_toml_manifest_build ... ok
+test test_cli_root_element_selection ... ok
+test test_java_csharp_model_style_options_and_manifest ... ok
+test unified_manifest_forms_generate_identical_output_and_validate_early ... ok
+test unsupported_xsd_alternatives_fail_explicitly ... ok
+test zsh_completion_filters_values_when_available ... ok
+test validate_and_generate_reject_upa_violations ... ok
+test unified_options_fail_before_schema_io_including_dry_run ... ok
+test unified_supported_backends_and_styles_validate ... ok
+=== RUN   TestAccountE2E
+--- PASS: TestAccountE2E (0.00s)
+PASS
+ok  	crm	0.005s
+test test_cli_go_generation ... ok
+E2E C++20 driver passed!
+test test_cli_cpp_generation ... ok
+test test_cli_java_generation ... ok
+test test_cli_shared_modules_deduplication ... ok
+  Determining projects to restore...
+  Restored /tmp/.tmpJDG5XH/cli_csharp_app/CrmCliApp.csproj (in 201 ms).
+test test_cli_typescript_generation ... ok
+  CrmCliApp -> /tmp/.tmpJDG5XH/cli_csharp_app/bin/Debug/net8.0/CrmCliApp.dll
+
+Build succeeded.
+    0 Warning(s)
+    0 Error(s)
+
+Time Elapsed 00:00:01.43
+E2E C# CLI test passed successfully!
+test test_cli_csharp_generation ... ok
+test test_cli_rust_split_units_and_chunking ... ok
+
+test result: ok. 47 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 9.52s
+
+     Running unittests src/lib.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/polyxml_js-878a75d7b7901cc9)
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running unittests src/lib.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/_polyxml-a668b0910babaf29)
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running unittests src/lib.rs (/home/bailey/github/PolyXML/target/followup-runtime-integration-verification/debug/deps/polyxml_wasm-d510c7f48918b595)
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+   Doc-tests polyxml
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+   Doc-tests polyxml_cli
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+   Doc-tests polyxml_wasm
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+==> [4/6] Compiling Python PyO3 extension (maturin develop)...
+🍹 Building a mixed python/rust project
+🐍 Found CPython 3.14 at /home/bailey/github/polyxml-runtime-integration/.venv/bin/python
+🔗 Found pyo3 bindings with abi3-py3.12 support
+📡 Using build options features from pyproject.toml
+Using Python 3.14.4 environment at: /home/bailey/github/polyxml-runtime-integration/.venv
+Checked 6 packages in 30ms
+   Compiling syn v3.0.5
+   Compiling serde_core v1.0.229
+   Compiling serde_derive v1.0.229
+   Compiling serde v1.0.229
+   Compiling pyo3-ffi v0.29.2
+   Compiling syn v2.0.119
+   Compiling fastrand v2.5.0
+   Compiling phf_generator v0.14.0
+   Compiling pyo3-macros-backend v0.29.2
+   Compiling thiserror-impl v2.0.21
+   Compiling serde_json v1.0.151
+   Compiling minijinja v2.24.0
+   Compiling thiserror v2.0.21
+   Compiling pyo3 v0.29.2
+   Compiling pyo3-macros v0.29.2
+   Compiling phf_codegen v0.14.0
+   Compiling quick-xml v0.42.0
+   Compiling polyxml v0.34.6 (/home/bailey/github/polyxml-runtime-integration/crates/polyxml-core)
+   Compiling polyxml-python v0.34.6 (/home/bailey/github/polyxml-runtime-integration/crates/polyxml-python)
+    Finished `dev` profile [unoptimized + debuginfo] target(s) in 24.75s
+📦 Built wheel for abi3 Python ≥ 3.12 to /tmp/.tmpeXAPoi/polyxml-0.34.6-cp312-abi3-linux_x86_64.whl
+✏️ Setting installed package as editable
+🛠 Installed polyxml-0.34.6
+==> [5/6] Running Python Ruff checks...
+All checks passed!
+10 files already formatted
+==> [6/6] Running Python tests with 100% statement & branch coverage...
+........................................................................ [ 62%]
+...........................................                              [100%]
+================================ tests coverage ================================
+_______________ coverage: platform linux, python 3.14.4-final-0 ________________
+
+Name    Stmts   Miss Branch BrPart  Cover   Missing
+---------------------------------------------------
+TOTAL     181      0     58      0   100%
+
+3 files skipped due to complete coverage.
+Required test coverage of 100% reached. Total coverage: 100.00%
+115 passed in 0.62s
+✨ All PolyXML dual-language quality gates passed!
diff --git a/research/data/runtime-followups-2026-10-03/integration/metadata.json b/research/data/runtime-followups-2026-10-03/integration/metadata.json
new file mode 100644
index 0000000..a5934b2
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/integration/metadata.json
@@ -0,0 +1,12 @@
+{
+  "tested_revision": "71aff6ca6cbe7106dcc2389a2428571a16d69430",
+  "baseline": "1819c91",
+  "rust_tests": 334,
+  "python_tests": 115,
+  "wrapper_coverage": "100% statements and branches",
+  "workspace_target": "/home/bailey/github/PolyXML/target/followup-runtime-integration-verification",
+  "compiler_codegen_base": "053c2a9",
+  "namespace_fix": "ad9282e",
+  "mixed_writer_source": "58cb346",
+  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)\nbinary: rustc\ncommit-hash: b940084d7eb6a299eb4bfeb8e34901bc051e7ac4\ncommit-date: 2026-09-28\nhost: x86_64-unknown-linux-gnu\nrelease: 1.99.0\nLLVM version: 23.1.1\n"
+}
diff --git a/research/data/runtime-followups-2026-10-03/integration/polyxml-integration-corpus.sh.txt b/research/data/runtime-followups-2026-10-03/integration/polyxml-integration-corpus.sh.txt
new file mode 100644
index 0000000..30f711c
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/integration/polyxml-integration-corpus.sh.txt
@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+set -euo pipefail
+root=/home/bailey/github/PolyXML
+repo=/home/bailey/github/polyxml-runtime-integration
+companion=/home/bailey/github/polyxml-w3c-tests
+export POLYXML_MEMCAP_BACKEND=systemd CARGO_BUILD_JOBS=1
+export CARGO_TARGET_DIR="$root/target/followup-runtime-integration-verification"
+mkdir -p /tmp/polyxml-followup-integration-bin
+cp "$CARGO_TARGET_DIR/debug/polyxml" /tmp/polyxml-followup-integration-bin/polyxml
+export PATH=/tmp/polyxml-followup-integration-bin:$PATH
+test ! -e "$root/target/release/polyxml"
+"$root/scripts/memcap.sh" uv --directory "$companion" run --no-sync "$root/.venv/bin/maturin" develop --manifest-path "$repo/crates/polyxml-python/Cargo.toml" > /tmp/polyxml-runtime-integration-companion-binding.log 2>&1
+uv --directory "$companion" run --no-sync python /tmp/polyxml-probe-integration.py > /tmp/polyxml-runtime-integration-probe.json 2> /tmp/polyxml-runtime-integration-probe.log
+"$root/scripts/memcap.sh" uv --directory "$companion" run --no-sync runner.py --suite CType --limit 50 > /tmp/polyxml-runtime-integration-CType.log 2>&1
+"$root/scripts/memcap.sh" uv --directory "$companion" run --no-sync runner.py --suite AttrDecl --limit 50 > /tmp/polyxml-runtime-integration-AttrDecl.log 2>&1
+"$root/scripts/memcap.sh" uv --directory "$companion" run --no-sync runner.py --suite NIST --limit 100 > /tmp/polyxml-runtime-integration-NIST.log 2>&1
diff --git a/research/data/runtime-followups-2026-10-03/integration/polyxml-integration-verify.sh.txt b/research/data/runtime-followups-2026-10-03/integration/polyxml-integration-verify.sh.txt
new file mode 100644
index 0000000..bf01a6b
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/integration/polyxml-integration-verify.sh.txt
@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+set -euo pipefail
+cd /home/bailey/github/polyxml-runtime-integration
+export POLYXML_MEMCAP_BACKEND=systemd CARGO_BUILD_JOBS=1 DOTNET_ROLL_FORWARD=Major
+export PATH=/tmp/polyxml-corpus-tools/node_modules/.bin:$PATH
+root=/home/bailey/github/PolyXML
+ln -s "$root/benchmarks/rust-xml-regression/target" benchmarks/rust-xml-regression/target
+python3 benchmarks/rust-xml-regression/run_core.py --baseline ../polyxml-perf-selected --output "$root/benchmarks/rust-runtime-investigation/target/evidence/runtime-integration-core" --rounds 3 --samples 100 --warmup 3 --measurement 5
+python3 benchmarks/rust-xml-regression/run_core.py --baseline ../polyxml-perf-selected --harness benchmarks/rust-runtime-investigation/mixed_branches.rs --output "$root/benchmarks/rust-runtime-investigation/target/evidence/runtime-integration-branches" --rounds 2 --samples 50 --warmup 1 --measurement 2 --filter '^branch_write/.*/1000$'
+unlink benchmarks/rust-xml-regression/target
+export CARGO_TARGET_DIR="$root/target/followup-runtime-integration-verification"
+ln -s "$CARGO_TARGET_DIR" target
+ln -s "$root/.venv" .venv
+scripts/memcap.sh scripts/gate.sh > /tmp/polyxml-runtime-integration-gate.log 2>&1
+unlink target
+unlink .venv
diff --git a/research/data/runtime-followups-2026-10-03/integration/polyxml-probe-integration.py.txt b/research/data/runtime-followups-2026-10-03/integration/polyxml-probe-integration.py.txt
new file mode 100644
index 0000000..7734a4d
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/integration/polyxml-probe-integration.py.txt
@@ -0,0 +1,33 @@
+import dataclasses,hashlib,importlib.util,json,subprocess,sys,tempfile
+from pathlib import Path
+import polyxml
+import polyxml._polyxml as native
+repo=Path('/home/bailey/github/polyxml-runtime-integration')
+cli=Path('/tmp/polyxml-followup-integration-bin/polyxml')
+assert Path(native.__file__).resolve().is_relative_to(repo),native.__file__
+result={"revision":subprocess.check_output(['git','-C',str(repo),'rev-parse','HEAD'],text=True).strip(),"native_file":native.__file__,"native_sha256":hashlib.sha256(Path(native.__file__).read_bytes()).hexdigest(),"cli_sha256":hashlib.sha256(cli.read_bytes()).hexdigest()}
+with tempfile.TemporaryDirectory(prefix='polyxml-integration-probe-') as directory:
+ tmp=Path(directory)
+ subprocess.run([str(cli),'generate',str(repo/'research/fixtures/default_literal_escaping.xsd'),'--lang','python','--out',str(tmp/'models')],check=True,stdout=sys.stderr)
+ generated=next(p for p in (tmp/'models').rglob('*.py') if p.name!='__init__.py')
+ spec=importlib.util.spec_from_file_location('integration_generated_default',generated);module=importlib.util.module_from_spec(spec);sys.modules[spec.name]=module;spec.loader.exec_module(module)
+ # Independent lexical data, not a value read back from generated code.
+ expected='"quoted"'+chr(92)+'path'+chr(92)+'u000a'+chr(9)+chr(10)+chr(13)+chr(0x85)+chr(0x2028)+'café 😀'
+ model=module.RootType(fixed=expected)
+ assert model.value==expected and model.label==expected
+ fields={field.name:field for field in dataclasses.fields(module.RootType)}
+ assert fields['value'].metadata['default']==expected
+ assert fields['fixed'].metadata['fixed']==expected
+ result['generated_defaults']='passed'
+ entity=polyxml.xml_to_json(b'<Root><Status>R&amp;D</Status><Code>A&amp;B</Code><Fixed/><Default/></Root>',schema_path=repo/'research/fixtures/schema_attribute_entities.xsd',root='Root')
+ assert json.loads(entity)['Status']=='R&D';result['schema_entities']='passed'
+ nsxsd=tmp/'namespace.xsd';nsxsd.write_text("<xs:schema xmlns:xs='http://www.w3.org/2001/XMLSchema' targetNamespace='urn:integration:A&#x26;B' elementFormDefault='qualified'><xs:element name='Root'><xs:complexType><xs:sequence><xs:element name='Value' type='xs:int'/></xs:sequence></xs:complexType></xs:element></xs:schema>")
+ assert json.loads(polyxml.xml_to_json(b"<Root xmlns='urn:integration:A&amp;B'><Value>7</Value></Root>",schema_path=nsxsd,root='Root'))['Value']==7
+ result['namespace_entities']='passed'
+ mixed=tmp/'mixed.xsd';mixed.write_text("<xs:schema xmlns:xs='http://www.w3.org/2001/XMLSchema'><xs:element name='Root'><xs:complexType mixed='true'><xs:choice minOccurs='0' maxOccurs='unbounded'><xs:element name='Text' type='xs:string' nillable='true'/></xs:choice></xs:complexType></xs:element></xs:schema>")
+ original=polyxml.xml_to_json(b"<Root xmlns:i='http://www.w3.org/2001/XMLSchema-instance'>before<Text i:nil='true'/>after</Root>",schema_path=mixed,root='Root')
+ output=polyxml.json_to_xml(original,schema_path=mixed,root='Root')
+ assert json.loads(original)==json.loads(polyxml.xml_to_json(output,schema_path=mixed,root='Root'))
+ assert b'nil="true"' in output
+ result['mixed_nil_transcode']='passed'
+print(json.dumps(result,indent=2))
diff --git a/research/data/runtime-followups-2026-10-03/integration/probe.json b/research/data/runtime-followups-2026-10-03/integration/probe.json
new file mode 100644
index 0000000..662d290
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/integration/probe.json
@@ -0,0 +1,10 @@
+{
+  "revision": "71aff6ca6cbe7106dcc2389a2428571a16d69430",
+  "native_file": "/home/bailey/github/polyxml-runtime-integration/crates/polyxml-python/python/polyxml/_polyxml.abi3.so",
+  "native_sha256": "42dbd3a98d575ebdce8a45e277e7e3f9728f6139e0b0eed4b0d59c4d541d8cf1",
+  "cli_sha256": "b1ea4bc3e1ca1df4c40f8e9cf82a2d184e1f18eb120fec83bd4279f1c9529371",
+  "generated_defaults": "passed",
+  "schema_entities": "passed",
+  "namespace_entities": "passed",
+  "mixed_nil_transcode": "passed"
+}
diff --git a/research/data/runtime-followups-2026-10-03/integration/probe.log b/research/data/runtime-followups-2026-10-03/integration/probe.log
new file mode 100644
index 0000000..3d93fb2
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/integration/probe.log
@@ -0,0 +1,4 @@
+Parsing schema: /home/bailey/github/polyxml-runtime-integration/research/fixtures/default_literal_escaping.xsd
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 1
+Code generation complete.
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/SHA256SUMS b/research/data/runtime-followups-2026-10-03/mixed-writer/SHA256SUMS
new file mode 100644
index 0000000..d8b4d0c
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/SHA256SUMS
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/archive-criterion.py.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/archive-criterion.py.txt
new file mode 100644
index 0000000..e92f73c
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/archive-criterion.py.txt
@@ -0,0 +1,26 @@
+from pathlib import Path
+import gzip,hashlib,re,shutil,sys,tarfile
+root=Path(sys.argv[1])
+original=dict(line.split('  ',1)[::-1] for line in (root/'SHA256SUMS').read_text().splitlines())
+for dataset in sorted(root.iterdir()):
+ if not dataset.is_dir(): continue
+ directories=sorted(p for p in dataset.iterdir() if p.is_dir() and re.fullmatch(r'(baseline|current)-[0-9]+',p.name))
+ if not directories: continue
+ archive=dataset/'criterion-results.tar.gz'
+ assert not archive.exists(),archive
+ files=sorted(p for directory in directories for p in directory.rglob('*') if p.is_file())
+ expected={str(p.relative_to(dataset)):hashlib.sha256(p.read_bytes()).hexdigest() for p in files}
+ for path in files:
+  assert original[str(path.relative_to(root))]==expected[str(path.relative_to(dataset))],path
+ with archive.open('wb') as output,gzip.GzipFile(filename='',mode='wb',fileobj=output,mtime=0) as compressed,tarfile.open(fileobj=compressed,mode='w') as tar:
+  for path in files:
+   info=tar.gettarinfo(str(path),arcname=str(path.relative_to(dataset)))
+   info.mtime=0;info.uid=0;info.gid=0;info.uname='';info.gname=''
+   with path.open('rb') as source:tar.addfile(info,source)
+ with tarfile.open(archive,'r:gz') as tar:
+  observed={member.name:hashlib.sha256(tar.extractfile(member).read()).hexdigest() for member in tar.getmembers() if member.isfile()}
+ assert observed==expected,archive
+ (dataset/'criterion-SHA256SUMS').write_text(''.join(digest+'  '+name+'\n' for name,digest in expected.items()))
+ for directory in directories:shutil.rmtree(directory)
+ print(dataset.name,len(files))
+(root/'SHA256SUMS').write_text(''.join(hashlib.sha256(p.read_bytes()).hexdigest()+'  '+str(p.relative_to(root))+'\n' for p in sorted(root.rglob('*')) if p.is_file() and p!=root/'SHA256SUMS'))
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/branch-index.patch b/research/data/runtime-followups-2026-10-03/mixed-writer/branch-index.patch
new file mode 100644
index 0000000..c125578
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/branch-index.patch
@@ -0,0 +1,501 @@
+diff --git a/crates/polyxml-core/src/serializer.rs b/crates/polyxml-core/src/serializer.rs
+index f68ba99..3f19b9c 100644
+--- a/crates/polyxml-core/src/serializer.rs
++++ b/crates/polyxml-core/src/serializer.rs
+@@ -523,93 +523,7 @@ impl XmlSerializer {
+             if let Some(PolyValue::List(items)) =
+                 get_field(mixed.items_index, &schema.fields[mixed.items_index].name)
+             {
+-                for item in items {
+-                    let tagged_field = |name: &str| -> Option<&PolyValue> {
+-                        match item {
+-                            PolyValue::Object(tagged) => tagged.get(name),
+-                            PolyValue::Record { schema, values } => schema
+-                                .fields
+-                                .iter()
+-                                .position(|field| field.name == name)
+-                                .and_then(|idx| values.get(idx))
+-                                .and_then(Option::as_ref),
+-                            _ => None,
+-                        }
+-                    };
+-                    let Some(kind) = tagged_field("kind").and_then(PolyValue::as_str) else {
+-                        return Err(PolyXmlError::SerializationError(
+-                            "Mixed content item has no kind".into(),
+-                        ));
+-                    };
+-                    let Some(content) = tagged_field("value") else {
+-                        return Err(PolyXmlError::SerializationError(
+-                            "Mixed content item has no value".into(),
+-                        ));
+-                    };
+-                    if kind == "#text" {
+-                        let Some(text) = content.as_str() else {
+-                            return Err(PolyXmlError::SerializationError(
+-                                "Mixed text item must be a string".into(),
+-                            ));
+-                        };
+-                        writer
+-                            .write_event(Event::Text(BytesText::new(text)))
+-                            .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
+-                        continue;
+-                    }
+-                    let Some(branch) = mixed
+-                        .branches
+-                        .iter()
+-                        .find(|branch| branch.variant_name == kind)
+-                    else {
+-                        return Err(PolyXmlError::SerializationError(format!(
+-                            "Unknown mixed content kind: {kind}"
+-                        )));
+-                    };
+-                    let local_name = std::str::from_utf8(&branch.xml_name)?;
+-                    let qualified = if let Some(ctx) = ns_ctx {
+-                        ctx.qualify_element(
+-                            local_name,
+-                            branch.namespace.as_deref().or(schema.namespace.as_deref()),
+-                        )
+-                    } else {
+-                        Cow::Borrowed(local_name)
+-                    };
+-                    match &branch.val_type {
+-                        ValueType::Scalar(_) => {
+-                            let mut buf = [0u8; lexical_core::BUFFER_SIZE];
+-                            let Some(text) = Self::format_scalar_to(content, &mut buf) else {
+-                                return Err(PolyXmlError::SerializationError(format!(
+-                                    "Invalid mixed content value for {kind}"
+-                                )));
+-                            };
+-                            Self::validate_scalar(&branch.val_type, &text, kind)?;
+-                            writer
+-                                .write_event(Event::Start(BytesStart::new(qualified.as_ref())))
+-                                .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
+-                            writer
+-                                .write_event(Event::Text(BytesText::new(&text)))
+-                                .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
+-                            writer
+-                                .write_event(Event::End(BytesEnd::new(qualified.as_ref())))
+-                                .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
+-                        }
+-                        ValueType::Nested(nested) => Self::write_model(
+-                            writer,
+-                            &branch.xml_name,
+-                            content,
+-                            nested,
+-                            ns_ctx,
+-                            false,
+-                            branch.namespace.as_deref().or(nested.namespace.as_deref()),
+-                        )?,
+-                        ValueType::List(_) => {
+-                            return Err(PolyXmlError::SerializationError(
+-                                "Nested lists are invalid mixed content branches".into(),
+-                            ))
+-                        }
+-                    }
+-                }
++                Self::write_mixed_items(writer, items, schema, mixed, ns_ctx)?;
+             }
+         } else {
+             for (idx, field) in schema.fields.iter().enumerate() {
+@@ -759,6 +673,160 @@ impl XmlSerializer {
+         Ok(())
+     }
+ 
++    fn write_mixed_items<W: std::io::Write>(
++        writer: &mut Writer<W>,
++        items: &[PolyValue],
++        schema: &ModelSchema,
++        mixed: &crate::schema::MixedContentSchema,
++        ns_ctx: Option<&NamespaceContext>,
++    ) -> Result<()> {
++        // Amortize the temporary index only for sufficiently large schemas and
++        // repeated payloads. References avoid cloning keys or branch metadata.
++        if mixed.branches.len() >= 64 && items.len() >= 64 {
++            let mut index = std::collections::HashMap::with_capacity(mixed.branches.len());
++            for branch in &mixed.branches {
++                // Preserve the linear lookup's first-match behavior for public
++                // metadata containing duplicate variant names.
++                index.entry(branch.variant_name.as_str()).or_insert(branch);
++            }
++            Self::write_mixed_items_using(writer, items, schema, ns_ctx, |kind| {
++                index.get(kind).copied()
++            })
++        } else {
++            Self::write_mixed_items_using(writer, items, schema, ns_ctx, |kind| {
++                mixed
++                    .branches
++                    .iter()
++                    .find(|branch| branch.variant_name == kind)
++            })
++        }
++    }
++
++    #[inline(never)]
++    fn write_mixed_items_using<'a, W: std::io::Write, F>(
++        writer: &mut Writer<W>,
++        items: &[PolyValue],
++        schema: &ModelSchema,
++        ns_ctx: Option<&NamespaceContext>,
++        lookup: F,
++    ) -> Result<()>
++    where
++        F: Fn(&str) -> Option<&'a crate::schema::MixedBranchSchema>,
++    {
++        for item in items {
++            let tagged_field = |name: &str| -> Option<&PolyValue> {
++                match item {
++                    PolyValue::Object(tagged) => tagged.get(name),
++                    PolyValue::Record { schema, values } => schema
++                        .fields
++                        .iter()
++                        .position(|field| field.name == name)
++                        .and_then(|idx| values.get(idx))
++                        .and_then(Option::as_ref),
++                    _ => None,
++                }
++            };
++            let Some(kind) = tagged_field("kind").and_then(PolyValue::as_str) else {
++                return Err(PolyXmlError::SerializationError(
++                    "Mixed content item has no kind".into(),
++                ));
++            };
++            let Some(content) = tagged_field("value") else {
++                return Err(PolyXmlError::SerializationError(
++                    "Mixed content item has no value".into(),
++                ));
++            };
++            if kind == "#text" {
++                let Some(text) = content.as_str() else {
++                    return Err(PolyXmlError::SerializationError(
++                        "Mixed text item must be a string".into(),
++                    ));
++                };
++                writer
++                    .write_event(Event::Text(BytesText::new(text)))
++                    .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
++                continue;
++            }
++            let Some(branch) = lookup(kind) else {
++                return Err(PolyXmlError::SerializationError(format!(
++                    "Unknown mixed content kind: {kind}"
++                )));
++            };
++            let local_name = std::str::from_utf8(&branch.xml_name)?;
++            let qualified = if let Some(ctx) = ns_ctx {
++                ctx.qualify_element(
++                    local_name,
++                    branch.namespace.as_deref().or(schema.namespace.as_deref()),
++                )
++            } else {
++                Cow::Borrowed(local_name)
++            };
++            match &branch.val_type {
++                ValueType::Scalar(_) => {
++                    let mut buf = [0u8; lexical_core::BUFFER_SIZE];
++                    let Some(text) = Self::format_scalar_to(content, &mut buf) else {
++                        if content.is_null() {
++                            Self::write_mixed_nil(writer, qualified.as_ref())?;
++                            continue;
++                        }
++                        return Err(PolyXmlError::SerializationError(format!(
++                            "Invalid mixed content value for {kind}"
++                        )));
++                    };
++                    Self::validate_scalar(&branch.val_type, &text, kind)?;
++                    writer
++                        .write_event(Event::Start(BytesStart::new(qualified.as_ref())))
++                        .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
++                    writer
++                        .write_event(Event::Text(BytesText::new(&text)))
++                        .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
++                    writer
++                        .write_event(Event::End(BytesEnd::new(qualified.as_ref())))
++                        .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
++                }
++                ValueType::Nested(nested) => {
++                    if content.is_null() {
++                        Self::write_mixed_nil(writer, qualified.as_ref())?;
++                    } else {
++                        Self::write_model(
++                            writer,
++                            &branch.xml_name,
++                            content,
++                            nested,
++                            ns_ctx,
++                            false,
++                            branch.namespace.as_deref().or(nested.namespace.as_deref()),
++                        )?;
++                    }
++                }
++                ValueType::List(_) => {
++                    return Err(PolyXmlError::SerializationError(
++                        "Nested lists are invalid mixed content branches".into(),
++                    ))
++                }
++            }
++        }
++        Ok(())
++    }
++
++    // A tagged null is a present nil element, unlike an absent ordinary field.
++    // Bind the instance prefix locally without shadowing the element's QName.
++    // Scalar callers reach this through their existing failed-format path.
++    #[cold]
++    fn write_mixed_nil<W: std::io::Write>(writer: &mut Writer<W>, qualified: &str) -> Result<()> {
++        let (declaration, attribute) = if qualified.starts_with("xsi:") {
++            ("xmlns:xsi1", "xsi1:nil")
++        } else {
++            ("xmlns:xsi", "xsi:nil")
++        };
++        let mut element = BytesStart::new(qualified);
++        element.push_attribute((declaration, XSI_NS));
++        element.push_attribute((attribute, "true"));
++        writer
++            .write_event(Event::Empty(element))
++            .map_err(|error| PolyXmlError::SerializationError(error.to_string()))
++    }
++
+     fn write_any_wildcard_element<W: std::io::Write>(
+         writer: &mut quick_xml::Writer<W>,
+         val: &PolyValue,
+diff --git a/crates/polyxml-core/tests/test_mixed_branch_lookup.rs b/crates/polyxml-core/tests/test_mixed_branch_lookup.rs
+new file mode 100644
+index 0000000..52996dc
+--- /dev/null
++++ b/crates/polyxml-core/tests/test_mixed_branch_lookup.rs
+@@ -0,0 +1,122 @@
++use polyxml::schema::{FieldKind, FieldSchema, ModelSchema, ScalarType, ValueType};
++use polyxml::schema_parser::XsdParser;
++use polyxml::{deserialize, serialize, PolyValue};
++use std::{collections::HashMap, sync::Arc};
++
++fn tagged(kind: &str, value: PolyValue) -> PolyValue {
++    PolyValue::Object(HashMap::from([
++        ("kind".into(), PolyValue::String(kind.into())),
++        ("value".into(), value),
++    ]))
++}
++
++#[test]
++fn large_mixed_tables_keep_first_match_metadata_edits_records_and_nil() {
++    let declarations = (0..64)
++        .map(|i| format!(r#"<xs:element name="B{i}" type="xs:int"/>"#))
++        .collect::<String>();
++    let xsd = format!(
++        r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"><xs:element name="Root"><xs:complexType mixed="true"><xs:choice minOccurs="0" maxOccurs="unbounded">{declarations}</xs:choice></xs:complexType></xs:element></xs:schema>"#
++    );
++    let ir = XsdParser::new().parse_str(&xsd).unwrap();
++    let mut schema = ModelSchema::from_ir(&ir, Some("Root")).unwrap();
++    let mixed = schema.mixed_content.as_ref().unwrap();
++    let items_name = schema.fields[mixed.items_index].name.clone();
++    let kinds = (0..64)
++        .map(|i| {
++            mixed
++                .branches
++                .iter()
++                .find(|b| b.xml_name == format!("B{i}").as_bytes())
++                .unwrap()
++                .variant_name
++                .clone()
++        })
++        .collect::<Vec<_>>();
++    let first_index = mixed
++        .branches
++        .iter()
++        .position(|b| b.xml_name == b"B0")
++        .unwrap();
++    let old_kind = kinds[0].clone();
++    let record_schema = ModelSchema::builder("Tagged")
++        .field(FieldSchema::new(
++            "value",
++            b"value",
++            FieldKind::Element,
++            ValueType::Scalar(ScalarType::Int),
++        ))
++        .field(FieldSchema::new(
++            "kind",
++            b"kind",
++            FieldKind::Element,
++            ValueType::Scalar(ScalarType::String),
++        ))
++        .build();
++    let mut items = (0..256)
++        .map(|i| tagged(&kinds[i % 64], PolyValue::Int(i as i64)))
++        .collect::<Vec<_>>();
++    items[0] = PolyValue::Record {
++        schema: record_schema,
++        values: vec![
++            Some(PolyValue::Int(0)),
++            Some(PolyValue::String(old_kind.clone())),
++        ]
++        .into_boxed_slice(),
++    };
++    items.push(tagged(&kinds[63], PolyValue::Null));
++    let mut value = PolyValue::Object(HashMap::from([(
++        items_name.clone(),
++        PolyValue::List(items),
++    )]));
++    {
++        let mixed = Arc::get_mut(&mut schema)
++            .unwrap()
++            .mixed_content
++            .as_mut()
++            .unwrap();
++        let mut duplicate = mixed.branches[first_index].clone();
++        duplicate.xml_name = b"Duplicate".to_vec();
++        mixed.branches.push(duplicate);
++    }
++    let output = serialize("Root", &value, &schema, None).unwrap();
++    assert!(std::str::from_utf8(&output).unwrap().contains("<B0>0</B0>"));
++    assert!(!std::str::from_utf8(&output).unwrap().contains("<Duplicate"));
++    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
++    Arc::get_mut(&mut schema)
++        .unwrap()
++        .mixed_content
++        .as_mut()
++        .unwrap()
++        .branches[first_index]
++        .variant_name = "changed_kind".into();
++    let PolyValue::Object(root) = &mut value else {
++        unreachable!()
++    };
++    let PolyValue::List(items) = root.get_mut(&items_name).unwrap() else {
++        unreachable!()
++    };
++    for item in items.iter_mut() {
++        if item.get("kind").and_then(PolyValue::as_str) == Some(old_kind.as_str()) {
++            match item {
++                PolyValue::Object(fields) => {
++                    fields.insert("kind".into(), PolyValue::String("changed_kind".into()));
++                }
++                PolyValue::Record { values, .. } => {
++                    values[1] = Some(PolyValue::String("changed_kind".into()))
++                }
++                _ => unreachable!(),
++            }
++        }
++    }
++    let output = serialize("Root", &value, &schema, None).unwrap();
++    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
++    let PolyValue::Object(root) = &mut value else {
++        unreachable!()
++    };
++    let PolyValue::List(items) = root.get_mut(&items_name).unwrap() else {
++        unreachable!()
++    };
++    items[0] = tagged("unregistered", PolyValue::Int(0));
++    assert!(serialize("Root", &value, &schema, None).is_err());
++}
+diff --git a/crates/polyxml-core/tests/test_mixed_nil.rs b/crates/polyxml-core/tests/test_mixed_nil.rs
+new file mode 100644
+index 0000000..95cc765
+--- /dev/null
++++ b/crates/polyxml-core/tests/test_mixed_nil.rs
+@@ -0,0 +1,93 @@
++use std::collections::HashMap;
++use std::sync::Arc;
++
++use polyxml::schema::ModelSchema;
++use polyxml::schema_parser::XsdParser;
++use polyxml::serializer::XmlSerializer;
++use polyxml::{deserialize, serialize, PolyValue};
++
++fn schema(namespace: Option<&str>) -> Arc<ModelSchema> {
++    let declaration = namespace
++        .map(|ns| format!("targetNamespace='{ns}' xmlns:t='{ns}' elementFormDefault='qualified'"))
++        .unwrap_or_default();
++    let xsd = format!("<xs:schema xmlns:xs='http://www.w3.org/2001/XMLSchema' {declaration}>
++      <xs:element name='Root'><xs:complexType mixed='true'><xs:choice minOccurs='0' maxOccurs='unbounded'>
++        <xs:element name='Text' type='xs:string' nillable='true'/>
++        <xs:element name='Number' type='xs:int' nillable='true'/>
++        <xs:element name='Child' nillable='true'><xs:complexType><xs:sequence>
++          <xs:element name='Value' type='xs:string'/>
++        </xs:sequence></xs:complexType></xs:element>
++      </xs:choice></xs:complexType></xs:element></xs:schema>");
++    let ir = XsdParser::new().parse_str(&xsd).unwrap();
++    ModelSchema::from_ir(&ir, Some("Root")).unwrap()
++}
++
++#[test]
++fn nil_scalar_and_nested_items_keep_order_and_differ_from_empty_strings() {
++    let schema = schema(None);
++    for nil in [
++        "<Text i:nil='true'/>",
++        "<Text i:nil='1'></Text>",
++        "<Number i:nil='true'/>",
++        "<Child i:nil='true'/>",
++    ] {
++        let xml = format!("<Root xmlns:i='http://www.w3.org/2001/XMLSchema-instance'>before{nil}<Text/><Child><Value>nested</Value></Child>{nil}<Text>after</Text></Root>");
++        let value = deserialize(xml.as_bytes(), Arc::clone(&schema)).unwrap();
++        let items_field = &schema.fields[schema.mixed_content.as_ref().unwrap().items_index].name;
++        let items = value.get(items_field).and_then(PolyValue::as_list).unwrap();
++        assert!(items[1].get("value").unwrap().is_null());
++        assert_eq!(items[2].get("value").and_then(PolyValue::as_str), Some(""));
++        assert!(items[4].get("value").unwrap().is_null());
++        let output = serialize("Root", &value, &schema, None).unwrap();
++        assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
++    }
++}
++
++#[test]
++fn nil_instance_prefix_does_not_rebind_the_element_namespace() {
++    let schema = schema(Some("urn:document"));
++    let xml = b"<Root xmlns='urn:document' xmlns:i='http://www.w3.org/2001/XMLSchema-instance'><Text i:nil='true'/><Number i:nil='true'/><Child i:nil='true'/><Text>after</Text></Root>";
++    let value = deserialize(xml, Arc::clone(&schema)).unwrap();
++    for prefix in ["", "doc", "xsi", "xsi1"] {
++        let ns_map = HashMap::from([(prefix.to_owned(), "urn:document".to_owned())]);
++        let output = XmlSerializer::serialize_with_options(
++            "Root",
++            &value,
++            &schema,
++            None,
++            Some(true),
++            Some(&ns_map),
++        )
++        .unwrap();
++        let mut reader = quick_xml::NsReader::from_reader(output.as_slice());
++        let mut nils = 0;
++        loop {
++            let (namespace, event) = reader.read_resolved_event().unwrap();
++            match event {
++                quick_xml::events::Event::Empty(element) => {
++                    assert!(
++                        matches!(namespace, quick_xml::name::ResolveResult::Bound(uri) if uri.as_ref() == "urn:document")
++                    );
++                    for attribute in element.attributes() {
++                        let attribute = attribute.unwrap();
++                        if attribute.key.local_name().as_ref() == "nil" {
++                            let (namespace, _) = reader.resolver().resolve_attribute(attribute.key);
++                            assert!(
++                                matches!(namespace, quick_xml::name::ResolveResult::Bound(uri) if uri.as_ref() == "http://www.w3.org/2001/XMLSchema-instance")
++                            );
++                            nils += 1;
++                        }
++                    }
++                }
++                quick_xml::events::Event::Eof => break,
++                _ => {}
++            }
++        }
++        assert_eq!(nils, 3);
++        assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
++    }
++    let output =
++        XmlSerializer::serialize_with_options("Root", &value, &schema, None, Some(false), None)
++            .unwrap();
++    assert_eq!(value, deserialize(&output, schema).unwrap());
++}
+diff --git a/crates/polyxml-core/tests/test_runtime_fast_paths.rs b/crates/polyxml-core/tests/test_runtime_fast_paths.rs
+index c0f13f1..07aa439 100644
+--- a/crates/polyxml-core/tests/test_runtime_fast_paths.rs
++++ b/crates/polyxml-core/tests/test_runtime_fast_paths.rs
+@@ -239,6 +239,8 @@ fn unified_scalar_state_keeps_mixed_branch_order_nil_and_nested_frames() {
+         assert_eq!(value,deserialize(&output,Arc::clone(&schema)).unwrap());
+     }
+     let nil_document = b"<Root xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'><Text xsi:nil='true'/><State>Ready</State></Root>";
+-    assert!(deserialize(nil_document, Arc::clone(&schema)).is_ok());
++    let value = deserialize(nil_document, Arc::clone(&schema)).unwrap();
++    let output = serialize("Root", &value, &schema, None).unwrap();
++    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+     assert!(deserialize(b"<Root><State>invalid</State></Root>", schema).is_err());
+ }
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/cold-nil.patch b/research/data/runtime-followups-2026-10-03/mixed-writer/cold-nil.patch
new file mode 100644
index 0000000..c22a9e6
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/cold-nil.patch
@@ -0,0 +1,184 @@
+diff --git a/crates/polyxml-core/src/serializer.rs b/crates/polyxml-core/src/serializer.rs
+index f68ba99..3103f0d 100644
+--- a/crates/polyxml-core/src/serializer.rs
++++ b/crates/polyxml-core/src/serializer.rs
+@@ -579,6 +579,10 @@ impl XmlSerializer {
+                         ValueType::Scalar(_) => {
+                             let mut buf = [0u8; lexical_core::BUFFER_SIZE];
+                             let Some(text) = Self::format_scalar_to(content, &mut buf) else {
++                                if content.is_null() {
++                                    Self::write_mixed_nil(writer, qualified.as_ref())?;
++                                    continue;
++                                }
+                                 return Err(PolyXmlError::SerializationError(format!(
+                                     "Invalid mixed content value for {kind}"
+                                 )));
+@@ -594,15 +598,21 @@ impl XmlSerializer {
+                                 .write_event(Event::End(BytesEnd::new(qualified.as_ref())))
+                                 .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
+                         }
+-                        ValueType::Nested(nested) => Self::write_model(
+-                            writer,
+-                            &branch.xml_name,
+-                            content,
+-                            nested,
+-                            ns_ctx,
+-                            false,
+-                            branch.namespace.as_deref().or(nested.namespace.as_deref()),
+-                        )?,
++                        ValueType::Nested(nested) => {
++                            if content.is_null() {
++                                Self::write_mixed_nil(writer, qualified.as_ref())?;
++                            } else {
++                                Self::write_model(
++                                    writer,
++                                    &branch.xml_name,
++                                    content,
++                                    nested,
++                                    ns_ctx,
++                                    false,
++                                    branch.namespace.as_deref().or(nested.namespace.as_deref()),
++                                )?;
++                            }
++                        }
+                         ValueType::List(_) => {
+                             return Err(PolyXmlError::SerializationError(
+                                 "Nested lists are invalid mixed content branches".into(),
+@@ -759,6 +769,24 @@ impl XmlSerializer {
+         Ok(())
+     }
+ 
++    // A tagged null is a present nil element, unlike an absent ordinary field.
++    // Bind the instance prefix locally without shadowing the element's QName.
++    // Scalar callers reach this through their existing failed-format path.
++    #[cold]
++    fn write_mixed_nil<W: std::io::Write>(writer: &mut Writer<W>, qualified: &str) -> Result<()> {
++        let (declaration, attribute) = if qualified.starts_with("xsi:") {
++            ("xmlns:xsi1", "xsi1:nil")
++        } else {
++            ("xmlns:xsi", "xsi:nil")
++        };
++        let mut element = BytesStart::new(qualified);
++        element.push_attribute((declaration, XSI_NS));
++        element.push_attribute((attribute, "true"));
++        writer
++            .write_event(Event::Empty(element))
++            .map_err(|error| PolyXmlError::SerializationError(error.to_string()))
++    }
++
+     fn write_any_wildcard_element<W: std::io::Write>(
+         writer: &mut quick_xml::Writer<W>,
+         val: &PolyValue,
+diff --git a/crates/polyxml-core/tests/test_mixed_nil.rs b/crates/polyxml-core/tests/test_mixed_nil.rs
+new file mode 100644
+index 0000000..95cc765
+--- /dev/null
++++ b/crates/polyxml-core/tests/test_mixed_nil.rs
+@@ -0,0 +1,93 @@
++use std::collections::HashMap;
++use std::sync::Arc;
++
++use polyxml::schema::ModelSchema;
++use polyxml::schema_parser::XsdParser;
++use polyxml::serializer::XmlSerializer;
++use polyxml::{deserialize, serialize, PolyValue};
++
++fn schema(namespace: Option<&str>) -> Arc<ModelSchema> {
++    let declaration = namespace
++        .map(|ns| format!("targetNamespace='{ns}' xmlns:t='{ns}' elementFormDefault='qualified'"))
++        .unwrap_or_default();
++    let xsd = format!("<xs:schema xmlns:xs='http://www.w3.org/2001/XMLSchema' {declaration}>
++      <xs:element name='Root'><xs:complexType mixed='true'><xs:choice minOccurs='0' maxOccurs='unbounded'>
++        <xs:element name='Text' type='xs:string' nillable='true'/>
++        <xs:element name='Number' type='xs:int' nillable='true'/>
++        <xs:element name='Child' nillable='true'><xs:complexType><xs:sequence>
++          <xs:element name='Value' type='xs:string'/>
++        </xs:sequence></xs:complexType></xs:element>
++      </xs:choice></xs:complexType></xs:element></xs:schema>");
++    let ir = XsdParser::new().parse_str(&xsd).unwrap();
++    ModelSchema::from_ir(&ir, Some("Root")).unwrap()
++}
++
++#[test]
++fn nil_scalar_and_nested_items_keep_order_and_differ_from_empty_strings() {
++    let schema = schema(None);
++    for nil in [
++        "<Text i:nil='true'/>",
++        "<Text i:nil='1'></Text>",
++        "<Number i:nil='true'/>",
++        "<Child i:nil='true'/>",
++    ] {
++        let xml = format!("<Root xmlns:i='http://www.w3.org/2001/XMLSchema-instance'>before{nil}<Text/><Child><Value>nested</Value></Child>{nil}<Text>after</Text></Root>");
++        let value = deserialize(xml.as_bytes(), Arc::clone(&schema)).unwrap();
++        let items_field = &schema.fields[schema.mixed_content.as_ref().unwrap().items_index].name;
++        let items = value.get(items_field).and_then(PolyValue::as_list).unwrap();
++        assert!(items[1].get("value").unwrap().is_null());
++        assert_eq!(items[2].get("value").and_then(PolyValue::as_str), Some(""));
++        assert!(items[4].get("value").unwrap().is_null());
++        let output = serialize("Root", &value, &schema, None).unwrap();
++        assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
++    }
++}
++
++#[test]
++fn nil_instance_prefix_does_not_rebind_the_element_namespace() {
++    let schema = schema(Some("urn:document"));
++    let xml = b"<Root xmlns='urn:document' xmlns:i='http://www.w3.org/2001/XMLSchema-instance'><Text i:nil='true'/><Number i:nil='true'/><Child i:nil='true'/><Text>after</Text></Root>";
++    let value = deserialize(xml, Arc::clone(&schema)).unwrap();
++    for prefix in ["", "doc", "xsi", "xsi1"] {
++        let ns_map = HashMap::from([(prefix.to_owned(), "urn:document".to_owned())]);
++        let output = XmlSerializer::serialize_with_options(
++            "Root",
++            &value,
++            &schema,
++            None,
++            Some(true),
++            Some(&ns_map),
++        )
++        .unwrap();
++        let mut reader = quick_xml::NsReader::from_reader(output.as_slice());
++        let mut nils = 0;
++        loop {
++            let (namespace, event) = reader.read_resolved_event().unwrap();
++            match event {
++                quick_xml::events::Event::Empty(element) => {
++                    assert!(
++                        matches!(namespace, quick_xml::name::ResolveResult::Bound(uri) if uri.as_ref() == "urn:document")
++                    );
++                    for attribute in element.attributes() {
++                        let attribute = attribute.unwrap();
++                        if attribute.key.local_name().as_ref() == "nil" {
++                            let (namespace, _) = reader.resolver().resolve_attribute(attribute.key);
++                            assert!(
++                                matches!(namespace, quick_xml::name::ResolveResult::Bound(uri) if uri.as_ref() == "http://www.w3.org/2001/XMLSchema-instance")
++                            );
++                            nils += 1;
++                        }
++                    }
++                }
++                quick_xml::events::Event::Eof => break,
++                _ => {}
++            }
++        }
++        assert_eq!(nils, 3);
++        assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
++    }
++    let output =
++        XmlSerializer::serialize_with_options("Root", &value, &schema, None, Some(false), None)
++            .unwrap();
++    assert_eq!(value, deserialize(&output, schema).unwrap());
++}
+diff --git a/crates/polyxml-core/tests/test_runtime_fast_paths.rs b/crates/polyxml-core/tests/test_runtime_fast_paths.rs
+index c0f13f1..07aa439 100644
+--- a/crates/polyxml-core/tests/test_runtime_fast_paths.rs
++++ b/crates/polyxml-core/tests/test_runtime_fast_paths.rs
+@@ -239,6 +239,8 @@ fn unified_scalar_state_keeps_mixed_branch_order_nil_and_nested_frames() {
+         assert_eq!(value,deserialize(&output,Arc::clone(&schema)).unwrap());
+     }
+     let nil_document = b"<Root xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'><Text xsi:nil='true'/><State>Ready</State></Root>";
+-    assert!(deserialize(nil_document, Arc::clone(&schema)).is_ok());
++    let value = deserialize(nil_document, Arc::clone(&schema)).unwrap();
++    let output = serialize("Root", &value, &schema, None).unwrap();
++    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+     assert!(deserialize(b"<Root><State>invalid</State></Root>", schema).is_err());
+ }
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/initial-nil.patch b/research/data/runtime-followups-2026-10-03/mixed-writer/initial-nil.patch
new file mode 100644
index 0000000..96bb6c3
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/initial-nil.patch
@@ -0,0 +1,144 @@
+diff --git a/crates/polyxml-core/src/serializer.rs b/crates/polyxml-core/src/serializer.rs
+index f68ba99..c284ffa 100644
+--- a/crates/polyxml-core/src/serializer.rs
++++ b/crates/polyxml-core/src/serializer.rs
+@@ -575,6 +575,26 @@ impl XmlSerializer {
+                     } else {
+                         Cow::Borrowed(local_name)
+                     };
++                    // A tagged null is a present nil element, unlike an absent
++                    // ordinary field. Bind the instance prefix locally so nil
++                    // also works without a root namespace context. Do not
++                    // shadow the prefix used by the element's own QName.
++                    if content.is_null() && !matches!(branch.val_type, ValueType::List(_)) {
++                        let prefix = if qualified.starts_with("xsi:") {
++                            "xsi1"
++                        } else {
++                            "xsi"
++                        };
++                        let mut element = BytesStart::new(qualified.as_ref());
++                        let declaration = format!("xmlns:{prefix}");
++                        let attribute = format!("{prefix}:nil");
++                        element.push_attribute((declaration.as_str(), XSI_NS));
++                        element.push_attribute((attribute.as_str(), "true"));
++                        writer
++                            .write_event(Event::Empty(element))
++                            .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
++                        continue;
++                    }
+                     match &branch.val_type {
+                         ValueType::Scalar(_) => {
+                             let mut buf = [0u8; lexical_core::BUFFER_SIZE];
+diff --git a/crates/polyxml-core/tests/test_mixed_nil.rs b/crates/polyxml-core/tests/test_mixed_nil.rs
+new file mode 100644
+index 0000000..95cc765
+--- /dev/null
++++ b/crates/polyxml-core/tests/test_mixed_nil.rs
+@@ -0,0 +1,93 @@
++use std::collections::HashMap;
++use std::sync::Arc;
++
++use polyxml::schema::ModelSchema;
++use polyxml::schema_parser::XsdParser;
++use polyxml::serializer::XmlSerializer;
++use polyxml::{deserialize, serialize, PolyValue};
++
++fn schema(namespace: Option<&str>) -> Arc<ModelSchema> {
++    let declaration = namespace
++        .map(|ns| format!("targetNamespace='{ns}' xmlns:t='{ns}' elementFormDefault='qualified'"))
++        .unwrap_or_default();
++    let xsd = format!("<xs:schema xmlns:xs='http://www.w3.org/2001/XMLSchema' {declaration}>
++      <xs:element name='Root'><xs:complexType mixed='true'><xs:choice minOccurs='0' maxOccurs='unbounded'>
++        <xs:element name='Text' type='xs:string' nillable='true'/>
++        <xs:element name='Number' type='xs:int' nillable='true'/>
++        <xs:element name='Child' nillable='true'><xs:complexType><xs:sequence>
++          <xs:element name='Value' type='xs:string'/>
++        </xs:sequence></xs:complexType></xs:element>
++      </xs:choice></xs:complexType></xs:element></xs:schema>");
++    let ir = XsdParser::new().parse_str(&xsd).unwrap();
++    ModelSchema::from_ir(&ir, Some("Root")).unwrap()
++}
++
++#[test]
++fn nil_scalar_and_nested_items_keep_order_and_differ_from_empty_strings() {
++    let schema = schema(None);
++    for nil in [
++        "<Text i:nil='true'/>",
++        "<Text i:nil='1'></Text>",
++        "<Number i:nil='true'/>",
++        "<Child i:nil='true'/>",
++    ] {
++        let xml = format!("<Root xmlns:i='http://www.w3.org/2001/XMLSchema-instance'>before{nil}<Text/><Child><Value>nested</Value></Child>{nil}<Text>after</Text></Root>");
++        let value = deserialize(xml.as_bytes(), Arc::clone(&schema)).unwrap();
++        let items_field = &schema.fields[schema.mixed_content.as_ref().unwrap().items_index].name;
++        let items = value.get(items_field).and_then(PolyValue::as_list).unwrap();
++        assert!(items[1].get("value").unwrap().is_null());
++        assert_eq!(items[2].get("value").and_then(PolyValue::as_str), Some(""));
++        assert!(items[4].get("value").unwrap().is_null());
++        let output = serialize("Root", &value, &schema, None).unwrap();
++        assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
++    }
++}
++
++#[test]
++fn nil_instance_prefix_does_not_rebind_the_element_namespace() {
++    let schema = schema(Some("urn:document"));
++    let xml = b"<Root xmlns='urn:document' xmlns:i='http://www.w3.org/2001/XMLSchema-instance'><Text i:nil='true'/><Number i:nil='true'/><Child i:nil='true'/><Text>after</Text></Root>";
++    let value = deserialize(xml, Arc::clone(&schema)).unwrap();
++    for prefix in ["", "doc", "xsi", "xsi1"] {
++        let ns_map = HashMap::from([(prefix.to_owned(), "urn:document".to_owned())]);
++        let output = XmlSerializer::serialize_with_options(
++            "Root",
++            &value,
++            &schema,
++            None,
++            Some(true),
++            Some(&ns_map),
++        )
++        .unwrap();
++        let mut reader = quick_xml::NsReader::from_reader(output.as_slice());
++        let mut nils = 0;
++        loop {
++            let (namespace, event) = reader.read_resolved_event().unwrap();
++            match event {
++                quick_xml::events::Event::Empty(element) => {
++                    assert!(
++                        matches!(namespace, quick_xml::name::ResolveResult::Bound(uri) if uri.as_ref() == "urn:document")
++                    );
++                    for attribute in element.attributes() {
++                        let attribute = attribute.unwrap();
++                        if attribute.key.local_name().as_ref() == "nil" {
++                            let (namespace, _) = reader.resolver().resolve_attribute(attribute.key);
++                            assert!(
++                                matches!(namespace, quick_xml::name::ResolveResult::Bound(uri) if uri.as_ref() == "http://www.w3.org/2001/XMLSchema-instance")
++                            );
++                            nils += 1;
++                        }
++                    }
++                }
++                quick_xml::events::Event::Eof => break,
++                _ => {}
++            }
++        }
++        assert_eq!(nils, 3);
++        assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
++    }
++    let output =
++        XmlSerializer::serialize_with_options("Root", &value, &schema, None, Some(false), None)
++            .unwrap();
++    assert_eq!(value, deserialize(&output, schema).unwrap());
++}
+diff --git a/crates/polyxml-core/tests/test_runtime_fast_paths.rs b/crates/polyxml-core/tests/test_runtime_fast_paths.rs
+index c0f13f1..07aa439 100644
+--- a/crates/polyxml-core/tests/test_runtime_fast_paths.rs
++++ b/crates/polyxml-core/tests/test_runtime_fast_paths.rs
+@@ -239,6 +239,8 @@ fn unified_scalar_state_keeps_mixed_branch_order_nil_and_nested_frames() {
+         assert_eq!(value,deserialize(&output,Arc::clone(&schema)).unwrap());
+     }
+     let nil_document = b"<Root xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'><Text xsi:nil='true'/><State>Ready</State></Root>";
+-    assert!(deserialize(nil_document, Arc::clone(&schema)).is_ok());
++    let value = deserialize(nil_document, Arc::clone(&schema)).unwrap();
++    let output = serialize("Root", &value, &schema, None).unwrap();
++    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+     assert!(deserialize(b"<Root><State>invalid</State></Root>", schema).is_err());
+ }
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/isolated-loop.patch b/research/data/runtime-followups-2026-10-03/mixed-writer/isolated-loop.patch
new file mode 100644
index 0000000..3a6decb
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/isolated-loop.patch
@@ -0,0 +1,345 @@
+diff --git a/crates/polyxml-core/src/serializer.rs b/crates/polyxml-core/src/serializer.rs
+index f68ba99..6021d08 100644
+--- a/crates/polyxml-core/src/serializer.rs
++++ b/crates/polyxml-core/src/serializer.rs
+@@ -523,93 +523,7 @@ impl XmlSerializer {
+             if let Some(PolyValue::List(items)) =
+                 get_field(mixed.items_index, &schema.fields[mixed.items_index].name)
+             {
+-                for item in items {
+-                    let tagged_field = |name: &str| -> Option<&PolyValue> {
+-                        match item {
+-                            PolyValue::Object(tagged) => tagged.get(name),
+-                            PolyValue::Record { schema, values } => schema
+-                                .fields
+-                                .iter()
+-                                .position(|field| field.name == name)
+-                                .and_then(|idx| values.get(idx))
+-                                .and_then(Option::as_ref),
+-                            _ => None,
+-                        }
+-                    };
+-                    let Some(kind) = tagged_field("kind").and_then(PolyValue::as_str) else {
+-                        return Err(PolyXmlError::SerializationError(
+-                            "Mixed content item has no kind".into(),
+-                        ));
+-                    };
+-                    let Some(content) = tagged_field("value") else {
+-                        return Err(PolyXmlError::SerializationError(
+-                            "Mixed content item has no value".into(),
+-                        ));
+-                    };
+-                    if kind == "#text" {
+-                        let Some(text) = content.as_str() else {
+-                            return Err(PolyXmlError::SerializationError(
+-                                "Mixed text item must be a string".into(),
+-                            ));
+-                        };
+-                        writer
+-                            .write_event(Event::Text(BytesText::new(text)))
+-                            .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
+-                        continue;
+-                    }
+-                    let Some(branch) = mixed
+-                        .branches
+-                        .iter()
+-                        .find(|branch| branch.variant_name == kind)
+-                    else {
+-                        return Err(PolyXmlError::SerializationError(format!(
+-                            "Unknown mixed content kind: {kind}"
+-                        )));
+-                    };
+-                    let local_name = std::str::from_utf8(&branch.xml_name)?;
+-                    let qualified = if let Some(ctx) = ns_ctx {
+-                        ctx.qualify_element(
+-                            local_name,
+-                            branch.namespace.as_deref().or(schema.namespace.as_deref()),
+-                        )
+-                    } else {
+-                        Cow::Borrowed(local_name)
+-                    };
+-                    match &branch.val_type {
+-                        ValueType::Scalar(_) => {
+-                            let mut buf = [0u8; lexical_core::BUFFER_SIZE];
+-                            let Some(text) = Self::format_scalar_to(content, &mut buf) else {
+-                                return Err(PolyXmlError::SerializationError(format!(
+-                                    "Invalid mixed content value for {kind}"
+-                                )));
+-                            };
+-                            Self::validate_scalar(&branch.val_type, &text, kind)?;
+-                            writer
+-                                .write_event(Event::Start(BytesStart::new(qualified.as_ref())))
+-                                .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
+-                            writer
+-                                .write_event(Event::Text(BytesText::new(&text)))
+-                                .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
+-                            writer
+-                                .write_event(Event::End(BytesEnd::new(qualified.as_ref())))
+-                                .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
+-                        }
+-                        ValueType::Nested(nested) => Self::write_model(
+-                            writer,
+-                            &branch.xml_name,
+-                            content,
+-                            nested,
+-                            ns_ctx,
+-                            false,
+-                            branch.namespace.as_deref().or(nested.namespace.as_deref()),
+-                        )?,
+-                        ValueType::List(_) => {
+-                            return Err(PolyXmlError::SerializationError(
+-                                "Nested lists are invalid mixed content branches".into(),
+-                            ))
+-                        }
+-                    }
+-                }
++                Self::write_mixed_items(writer, items, schema, mixed, ns_ctx)?;
+             }
+         } else {
+             for (idx, field) in schema.fields.iter().enumerate() {
+@@ -759,6 +673,132 @@ impl XmlSerializer {
+         Ok(())
+     }
+ 
++    #[inline(never)]
++    fn write_mixed_items<W: std::io::Write>(
++        writer: &mut Writer<W>,
++        items: &[PolyValue],
++        schema: &ModelSchema,
++        mixed: &crate::schema::MixedContentSchema,
++        ns_ctx: Option<&NamespaceContext>,
++    ) -> Result<()> {
++        for item in items {
++            let tagged_field = |name: &str| -> Option<&PolyValue> {
++                match item {
++                    PolyValue::Object(tagged) => tagged.get(name),
++                    PolyValue::Record { schema, values } => schema
++                        .fields
++                        .iter()
++                        .position(|field| field.name == name)
++                        .and_then(|idx| values.get(idx))
++                        .and_then(Option::as_ref),
++                    _ => None,
++                }
++            };
++            let Some(kind) = tagged_field("kind").and_then(PolyValue::as_str) else {
++                return Err(PolyXmlError::SerializationError(
++                    "Mixed content item has no kind".into(),
++                ));
++            };
++            let Some(content) = tagged_field("value") else {
++                return Err(PolyXmlError::SerializationError(
++                    "Mixed content item has no value".into(),
++                ));
++            };
++            if kind == "#text" {
++                let Some(text) = content.as_str() else {
++                    return Err(PolyXmlError::SerializationError(
++                        "Mixed text item must be a string".into(),
++                    ));
++                };
++                writer
++                    .write_event(Event::Text(BytesText::new(text)))
++                    .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
++                continue;
++            }
++            let Some(branch) = mixed
++                .branches
++                .iter()
++                .find(|branch| branch.variant_name == kind)
++            else {
++                return Err(PolyXmlError::SerializationError(format!(
++                    "Unknown mixed content kind: {kind}"
++                )));
++            };
++            let local_name = std::str::from_utf8(&branch.xml_name)?;
++            let qualified = if let Some(ctx) = ns_ctx {
++                ctx.qualify_element(
++                    local_name,
++                    branch.namespace.as_deref().or(schema.namespace.as_deref()),
++                )
++            } else {
++                Cow::Borrowed(local_name)
++            };
++            match &branch.val_type {
++                ValueType::Scalar(_) => {
++                    let mut buf = [0u8; lexical_core::BUFFER_SIZE];
++                    let Some(text) = Self::format_scalar_to(content, &mut buf) else {
++                        if content.is_null() {
++                            Self::write_mixed_nil(writer, qualified.as_ref())?;
++                            continue;
++                        }
++                        return Err(PolyXmlError::SerializationError(format!(
++                            "Invalid mixed content value for {kind}"
++                        )));
++                    };
++                    Self::validate_scalar(&branch.val_type, &text, kind)?;
++                    writer
++                        .write_event(Event::Start(BytesStart::new(qualified.as_ref())))
++                        .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
++                    writer
++                        .write_event(Event::Text(BytesText::new(&text)))
++                        .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
++                    writer
++                        .write_event(Event::End(BytesEnd::new(qualified.as_ref())))
++                        .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
++                }
++                ValueType::Nested(nested) => {
++                    if content.is_null() {
++                        Self::write_mixed_nil(writer, qualified.as_ref())?;
++                    } else {
++                        Self::write_model(
++                            writer,
++                            &branch.xml_name,
++                            content,
++                            nested,
++                            ns_ctx,
++                            false,
++                            branch.namespace.as_deref().or(nested.namespace.as_deref()),
++                        )?;
++                    }
++                }
++                ValueType::List(_) => {
++                    return Err(PolyXmlError::SerializationError(
++                        "Nested lists are invalid mixed content branches".into(),
++                    ))
++                }
++            }
++        }
++        Ok(())
++    }
++
++    // A tagged null is a present nil element, unlike an absent ordinary field.
++    // Bind the instance prefix locally without shadowing the element's QName.
++    // Scalar callers reach this through their existing failed-format path.
++    #[cold]
++    fn write_mixed_nil<W: std::io::Write>(writer: &mut Writer<W>, qualified: &str) -> Result<()> {
++        let (declaration, attribute) = if qualified.starts_with("xsi:") {
++            ("xmlns:xsi1", "xsi1:nil")
++        } else {
++            ("xmlns:xsi", "xsi:nil")
++        };
++        let mut element = BytesStart::new(qualified);
++        element.push_attribute((declaration, XSI_NS));
++        element.push_attribute((attribute, "true"));
++        writer
++            .write_event(Event::Empty(element))
++            .map_err(|error| PolyXmlError::SerializationError(error.to_string()))
++    }
++
+     fn write_any_wildcard_element<W: std::io::Write>(
+         writer: &mut quick_xml::Writer<W>,
+         val: &PolyValue,
+diff --git a/crates/polyxml-core/tests/test_mixed_nil.rs b/crates/polyxml-core/tests/test_mixed_nil.rs
+new file mode 100644
+index 0000000..95cc765
+--- /dev/null
++++ b/crates/polyxml-core/tests/test_mixed_nil.rs
+@@ -0,0 +1,93 @@
++use std::collections::HashMap;
++use std::sync::Arc;
++
++use polyxml::schema::ModelSchema;
++use polyxml::schema_parser::XsdParser;
++use polyxml::serializer::XmlSerializer;
++use polyxml::{deserialize, serialize, PolyValue};
++
++fn schema(namespace: Option<&str>) -> Arc<ModelSchema> {
++    let declaration = namespace
++        .map(|ns| format!("targetNamespace='{ns}' xmlns:t='{ns}' elementFormDefault='qualified'"))
++        .unwrap_or_default();
++    let xsd = format!("<xs:schema xmlns:xs='http://www.w3.org/2001/XMLSchema' {declaration}>
++      <xs:element name='Root'><xs:complexType mixed='true'><xs:choice minOccurs='0' maxOccurs='unbounded'>
++        <xs:element name='Text' type='xs:string' nillable='true'/>
++        <xs:element name='Number' type='xs:int' nillable='true'/>
++        <xs:element name='Child' nillable='true'><xs:complexType><xs:sequence>
++          <xs:element name='Value' type='xs:string'/>
++        </xs:sequence></xs:complexType></xs:element>
++      </xs:choice></xs:complexType></xs:element></xs:schema>");
++    let ir = XsdParser::new().parse_str(&xsd).unwrap();
++    ModelSchema::from_ir(&ir, Some("Root")).unwrap()
++}
++
++#[test]
++fn nil_scalar_and_nested_items_keep_order_and_differ_from_empty_strings() {
++    let schema = schema(None);
++    for nil in [
++        "<Text i:nil='true'/>",
++        "<Text i:nil='1'></Text>",
++        "<Number i:nil='true'/>",
++        "<Child i:nil='true'/>",
++    ] {
++        let xml = format!("<Root xmlns:i='http://www.w3.org/2001/XMLSchema-instance'>before{nil}<Text/><Child><Value>nested</Value></Child>{nil}<Text>after</Text></Root>");
++        let value = deserialize(xml.as_bytes(), Arc::clone(&schema)).unwrap();
++        let items_field = &schema.fields[schema.mixed_content.as_ref().unwrap().items_index].name;
++        let items = value.get(items_field).and_then(PolyValue::as_list).unwrap();
++        assert!(items[1].get("value").unwrap().is_null());
++        assert_eq!(items[2].get("value").and_then(PolyValue::as_str), Some(""));
++        assert!(items[4].get("value").unwrap().is_null());
++        let output = serialize("Root", &value, &schema, None).unwrap();
++        assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
++    }
++}
++
++#[test]
++fn nil_instance_prefix_does_not_rebind_the_element_namespace() {
++    let schema = schema(Some("urn:document"));
++    let xml = b"<Root xmlns='urn:document' xmlns:i='http://www.w3.org/2001/XMLSchema-instance'><Text i:nil='true'/><Number i:nil='true'/><Child i:nil='true'/><Text>after</Text></Root>";
++    let value = deserialize(xml, Arc::clone(&schema)).unwrap();
++    for prefix in ["", "doc", "xsi", "xsi1"] {
++        let ns_map = HashMap::from([(prefix.to_owned(), "urn:document".to_owned())]);
++        let output = XmlSerializer::serialize_with_options(
++            "Root",
++            &value,
++            &schema,
++            None,
++            Some(true),
++            Some(&ns_map),
++        )
++        .unwrap();
++        let mut reader = quick_xml::NsReader::from_reader(output.as_slice());
++        let mut nils = 0;
++        loop {
++            let (namespace, event) = reader.read_resolved_event().unwrap();
++            match event {
++                quick_xml::events::Event::Empty(element) => {
++                    assert!(
++                        matches!(namespace, quick_xml::name::ResolveResult::Bound(uri) if uri.as_ref() == "urn:document")
++                    );
++                    for attribute in element.attributes() {
++                        let attribute = attribute.unwrap();
++                        if attribute.key.local_name().as_ref() == "nil" {
++                            let (namespace, _) = reader.resolver().resolve_attribute(attribute.key);
++                            assert!(
++                                matches!(namespace, quick_xml::name::ResolveResult::Bound(uri) if uri.as_ref() == "http://www.w3.org/2001/XMLSchema-instance")
++                            );
++                            nils += 1;
++                        }
++                    }
++                }
++                quick_xml::events::Event::Eof => break,
++                _ => {}
++            }
++        }
++        assert_eq!(nils, 3);
++        assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
++    }
++    let output =
++        XmlSerializer::serialize_with_options("Root", &value, &schema, None, Some(false), None)
++            .unwrap();
++    assert_eq!(value, deserialize(&output, schema).unwrap());
++}
+diff --git a/crates/polyxml-core/tests/test_runtime_fast_paths.rs b/crates/polyxml-core/tests/test_runtime_fast_paths.rs
+index c0f13f1..07aa439 100644
+--- a/crates/polyxml-core/tests/test_runtime_fast_paths.rs
++++ b/crates/polyxml-core/tests/test_runtime_fast_paths.rs
+@@ -239,6 +239,8 @@ fn unified_scalar_state_keeps_mixed_branch_order_nil_and_nested_frames() {
+         assert_eq!(value,deserialize(&output,Arc::clone(&schema)).unwrap());
+     }
+     let nil_document = b"<Root xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'><Text xsi:nil='true'/><State>Ready</State></Root>";
+-    assert!(deserialize(nil_document, Arc::clone(&schema)).is_ok());
++    let value = deserialize(nil_document, Arc::clone(&schema)).unwrap();
++    let output = serialize("Root", &value, &schema, None).unwrap();
++    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+     assert!(deserialize(b"<Root><State>invalid</State></Root>", schema).is_err());
+ }
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/metadata.json b/research/data/runtime-followups-2026-10-03/mixed-writer/metadata.json
new file mode 100644
index 0000000..18d401e
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/metadata.json
@@ -0,0 +1,11 @@
+{
+  "baseline": "1819c91",
+  "implementation": "58cb346",
+  "harness_revision": "58cb346",
+  "rust_tests": 324,
+  "rejected_preflights": [
+    "mixed-nil-instructions-empty-profile: missed marker and zero collected instructions",
+    "mixed-writer-tests.log: shared workspace target linked stale test binary"
+  ],
+  "workspace_target": "/home/bailey/github/PolyXML/target/followup-mixed-index-verification"
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations-sampled/baseline-Cargo.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations-sampled/baseline-Cargo.lock
new file mode 100644
index 0000000..897d8aa
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations-sampled/baseline-Cargo.lock
@@ -0,0 +1,317 @@
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations-sampled/baseline-Cargo.toml b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations-sampled/baseline-Cargo.toml
new file mode 100644
index 0000000..b3146ec
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations-sampled/baseline-Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name="branch-allocations"
+version="0.0.0"
+edition="2021"
+[workspace]
+[dependencies]
+polyxml={path="/home/bailey/github/polyxml-perf-selected/crates/polyxml-core"}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations-sampled/baseline-allocations.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations-sampled/baseline-allocations.txt
new file mode 100644
index 0000000..9c70427
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations-sampled/baseline-allocations.txt
@@ -0,0 +1,9 @@
+memcap: <=7682 MiB (60% of 12803 MiB available) [systemd MemoryMax, swap off]
+branches=1,items=1,allocations=1,reallocations=0,requested_bytes=512,output_bytes=23
+branches=1,items=1000,allocations=1,reallocations=5,requested_bytes=32256,output_bytes=11903
+branches=16,items=1,allocations=1,reallocations=0,requested_bytes=512,output_bytes=23
+branches=16,items=1000,allocations=1,reallocations=5,requested_bytes=32256,output_bytes=12647
+branches=64,items=1,allocations=1,reallocations=0,requested_bytes=512,output_bytes=23
+branches=64,items=1000,allocations=1,reallocations=5,requested_bytes=32256,output_bytes=13583
+branches=256,items=1,allocations=1,reallocations=0,requested_bytes=512,output_bytes=23
+branches=256,items=1000,allocations=1,reallocations=5,requested_bytes=32256,output_bytes=15023
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations-sampled/baseline-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations-sampled/baseline-build.txt
new file mode 100644
index 0000000..ba16df6
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations-sampled/baseline-build.txt
@@ -0,0 +1,3 @@
+memcap: <=7711 MiB (60% of 12853 MiB available) [systemd MemoryMax, swap off]
+   Compiling branch-allocations v0.0.0 (/home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/branch-allocations-baseline)
+    Finished `release` profile [optimized] target(s) in 0.90s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations-sampled/baseline-harness.rs b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations-sampled/baseline-harness.rs
new file mode 100644
index 0000000..c875031
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations-sampled/baseline-harness.rs
@@ -0,0 +1,89 @@
+use polyxml::schema::ModelSchema;
+use polyxml::schema_parser::XsdParser;
+use polyxml::{deserialize,serialize,PolyValue};
+use std::{hint::black_box,sync::Arc};
+use std::alloc::{GlobalAlloc, Layout, System};
+use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
+
+struct CountingAllocator;
+static COUNTING: AtomicBool = AtomicBool::new(false);
+static ALLOCATIONS: AtomicUsize = AtomicUsize::new(0);
+static REALLOCATIONS: AtomicUsize = AtomicUsize::new(0);
+static BYTES: AtomicUsize = AtomicUsize::new(0);
+
+// Diagnostic instrumentation only. The benchmark consumers use System directly.
+unsafe impl GlobalAlloc for CountingAllocator {
+    unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
+        if COUNTING.load(Ordering::Relaxed) {
+            ALLOCATIONS.fetch_add(1, Ordering::Relaxed);
+            BYTES.fetch_add(layout.size(), Ordering::Relaxed);
+        }
+        unsafe { System.alloc(layout) }
+    }
+    unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut u8 {
+        if COUNTING.load(Ordering::Relaxed) {
+            ALLOCATIONS.fetch_add(1, Ordering::Relaxed);
+            BYTES.fetch_add(layout.size(), Ordering::Relaxed);
+        }
+        unsafe { System.alloc_zeroed(layout) }
+    }
+    unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {
+        unsafe { System.dealloc(ptr, layout) }
+    }
+    unsafe fn realloc(&self, ptr: *mut u8, layout: Layout, new_size: usize) -> *mut u8 {
+        if COUNTING.load(Ordering::Relaxed) {
+            REALLOCATIONS.fetch_add(1, Ordering::Relaxed);
+            BYTES.fetch_add(new_size, Ordering::Relaxed);
+        }
+        unsafe { System.realloc(ptr, layout, new_size) }
+    }
+}
+#[global_allocator]
+static ALLOCATOR: CountingAllocator = CountingAllocator;
+
+fn fixture(branches: usize, count: usize) -> (Arc<ModelSchema>, Vec<u8>) {
+    let declarations = (0..branches)
+        .map(|i| format!(r#"<xs:element name="B{i}" type="xs:int"/>"#))
+        .collect::<String>();
+    let xsd = format!(
+        r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"><xs:element name="Root"><xs:complexType mixed="true"><xs:choice minOccurs="0" maxOccurs="unbounded">{declarations}</xs:choice></xs:complexType></xs:element></xs:schema>"#
+    );
+    let ir = XsdParser::new().parse_str(&xsd).unwrap();
+    let schema = ModelSchema::from_ir(&ir, Some("Root")).unwrap();
+    let body = (0..count)
+        .map(|i| format!("<B{}>{i}</B{}>", i % branches, i % branches))
+        .collect::<String>();
+    let xml = format!("<Root>{body}</Root>").into_bytes();
+    let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+    let mixed = schema.mixed_content.as_ref().unwrap();
+    let field = &schema.fields[mixed.items_index].name;
+    let items = value.get(field).and_then(PolyValue::as_list).unwrap();
+    assert_eq!(items.len(), count);
+    for (i, item) in items.iter().enumerate() {
+        assert_eq!(item.get("value"), Some(&PolyValue::Int(i as i64)));
+        let kind = item.get("kind").and_then(PolyValue::as_str).unwrap();
+        let branch = mixed
+            .branches
+            .iter()
+            .find(|b| b.variant_name == kind)
+            .unwrap();
+        assert_eq!(branch.xml_name, format!("B{}", i % branches).as_bytes());
+    }
+    let output = serialize("Root", &value, &schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    (schema, xml)
+}
+
+
+fn main() {
+ for branches in [1,16,64,256] { for count in [1,1000] {
+  let (schema,xml)=fixture(branches,count);
+  let value=deserialize(&xml,Arc::clone(&schema)).unwrap();
+  for _ in 0..3 { black_box(serialize("Root",&value,&schema,None).unwrap()); }
+  ALLOCATIONS.store(0,Ordering::Relaxed);REALLOCATIONS.store(0,Ordering::Relaxed);BYTES.store(0,Ordering::Relaxed);
+  COUNTING.store(true,Ordering::Relaxed);
+  let output=serialize("Root",&value,&schema,None).unwrap();
+  COUNTING.store(false,Ordering::Relaxed);
+  println!("branches={branches},items={count},allocations={},reallocations={},requested_bytes={},output_bytes={}",ALLOCATIONS.load(Ordering::Relaxed),REALLOCATIONS.load(Ordering::Relaxed),BYTES.load(Ordering::Relaxed),output.len());
+ } }
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations-sampled/baseline-metadata.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations-sampled/baseline-metadata.json
new file mode 100644
index 0000000..7053ee5
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations-sampled/baseline-metadata.json
@@ -0,0 +1,16 @@
+{
+  "revision": "1819c91b0808b9242c642d82350d2b657b60108c",
+  "items": [
+    1,
+    1000
+  ],
+  "branches": [
+    1,
+    16,
+    64,
+    256
+  ],
+  "operations": 1,
+  "warmup_operations": 3,
+  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)\nbinary: rustc\ncommit-hash: b940084d7eb6a299eb4bfeb8e34901bc051e7ac4\ncommit-date: 2026-09-28\nhost: x86_64-unknown-linux-gnu\nrelease: 1.99.0\nLLVM version: 23.1.1\n"
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations-sampled/current-Cargo.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations-sampled/current-Cargo.lock
new file mode 100644
index 0000000..897d8aa
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations-sampled/current-Cargo.lock
@@ -0,0 +1,317 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
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+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "branch-allocations"
+version = "0.0.0"
+dependencies = [
+ "polyxml",
+]
+
+[[package]]
+name = "fastrand"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "da7c62ceae207dd37ea5b845da6a0696c799f85e97da1ab5b7910be3c1c80223"
+
+[[package]]
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+[[package]]
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+dependencies = [
+ "lexical-parse-float",
+ "lexical-parse-integer",
+ "lexical-util",
+ "lexical-write-float",
+ "lexical-write-integer",
+]
+
+[[package]]
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+ "lexical-parse-integer",
+ "lexical-util",
+]
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+[[package]]
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+ "lexical-util",
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+ "memo-map",
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+ "phf_generator",
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+]
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+ "siphasher",
+]
+
+[[package]]
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+dependencies = [
+ "heck",
+ "lexical-core",
+ "memchr",
+ "minijinja",
+ "phf_codegen",
+ "quick-xml",
+ "regex",
+ "serde",
+ "serde_json",
+ "smallvec",
+ "thiserror",
+]
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+ "regex-syntax",
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+ "zmij",
+]
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+ "unicode-ident",
+]
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+]
+
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+ "quote",
+ "syn",
+]
+
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+
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations-sampled/current-Cargo.toml b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations-sampled/current-Cargo.toml
new file mode 100644
index 0000000..4788c05
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations-sampled/current-Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name="branch-allocations"
+version="0.0.0"
+edition="2021"
+[workspace]
+[dependencies]
+polyxml={path="/home/bailey/github/polyxml-mixed-index/crates/polyxml-core"}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations-sampled/current-allocations.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations-sampled/current-allocations.txt
new file mode 100644
index 0000000..89d07a1
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations-sampled/current-allocations.txt
@@ -0,0 +1,9 @@
+memcap: <=7662 MiB (60% of 12770 MiB available) [systemd MemoryMax, swap off]
+branches=1,items=1,allocations=1,reallocations=0,requested_bytes=512,output_bytes=23
+branches=1,items=1000,allocations=1,reallocations=5,requested_bytes=32256,output_bytes=11903
+branches=16,items=1,allocations=1,reallocations=0,requested_bytes=512,output_bytes=23
+branches=16,items=1000,allocations=1,reallocations=5,requested_bytes=32256,output_bytes=12647
+branches=64,items=1,allocations=1,reallocations=0,requested_bytes=512,output_bytes=23
+branches=64,items=1000,allocations=2,reallocations=5,requested_bytes=35472,output_bytes=13583
+branches=256,items=1,allocations=1,reallocations=0,requested_bytes=512,output_bytes=23
+branches=256,items=1000,allocations=2,reallocations=5,requested_bytes=45072,output_bytes=15023
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations-sampled/current-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations-sampled/current-build.txt
new file mode 100644
index 0000000..8b74f03
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations-sampled/current-build.txt
@@ -0,0 +1,4 @@
+memcap: <=7692 MiB (60% of 12820 MiB available) [systemd MemoryMax, swap off]
+   Compiling polyxml v0.34.6 (/home/bailey/github/polyxml-mixed-index/crates/polyxml-core)
+   Compiling branch-allocations v0.0.0 (/home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/branch-allocations-current)
+    Finished `release` profile [optimized] target(s) in 24.81s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations-sampled/current-harness.rs b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations-sampled/current-harness.rs
new file mode 100644
index 0000000..c875031
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations-sampled/current-harness.rs
@@ -0,0 +1,89 @@
+use polyxml::schema::ModelSchema;
+use polyxml::schema_parser::XsdParser;
+use polyxml::{deserialize,serialize,PolyValue};
+use std::{hint::black_box,sync::Arc};
+use std::alloc::{GlobalAlloc, Layout, System};
+use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
+
+struct CountingAllocator;
+static COUNTING: AtomicBool = AtomicBool::new(false);
+static ALLOCATIONS: AtomicUsize = AtomicUsize::new(0);
+static REALLOCATIONS: AtomicUsize = AtomicUsize::new(0);
+static BYTES: AtomicUsize = AtomicUsize::new(0);
+
+// Diagnostic instrumentation only. The benchmark consumers use System directly.
+unsafe impl GlobalAlloc for CountingAllocator {
+    unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
+        if COUNTING.load(Ordering::Relaxed) {
+            ALLOCATIONS.fetch_add(1, Ordering::Relaxed);
+            BYTES.fetch_add(layout.size(), Ordering::Relaxed);
+        }
+        unsafe { System.alloc(layout) }
+    }
+    unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut u8 {
+        if COUNTING.load(Ordering::Relaxed) {
+            ALLOCATIONS.fetch_add(1, Ordering::Relaxed);
+            BYTES.fetch_add(layout.size(), Ordering::Relaxed);
+        }
+        unsafe { System.alloc_zeroed(layout) }
+    }
+    unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {
+        unsafe { System.dealloc(ptr, layout) }
+    }
+    unsafe fn realloc(&self, ptr: *mut u8, layout: Layout, new_size: usize) -> *mut u8 {
+        if COUNTING.load(Ordering::Relaxed) {
+            REALLOCATIONS.fetch_add(1, Ordering::Relaxed);
+            BYTES.fetch_add(new_size, Ordering::Relaxed);
+        }
+        unsafe { System.realloc(ptr, layout, new_size) }
+    }
+}
+#[global_allocator]
+static ALLOCATOR: CountingAllocator = CountingAllocator;
+
+fn fixture(branches: usize, count: usize) -> (Arc<ModelSchema>, Vec<u8>) {
+    let declarations = (0..branches)
+        .map(|i| format!(r#"<xs:element name="B{i}" type="xs:int"/>"#))
+        .collect::<String>();
+    let xsd = format!(
+        r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"><xs:element name="Root"><xs:complexType mixed="true"><xs:choice minOccurs="0" maxOccurs="unbounded">{declarations}</xs:choice></xs:complexType></xs:element></xs:schema>"#
+    );
+    let ir = XsdParser::new().parse_str(&xsd).unwrap();
+    let schema = ModelSchema::from_ir(&ir, Some("Root")).unwrap();
+    let body = (0..count)
+        .map(|i| format!("<B{}>{i}</B{}>", i % branches, i % branches))
+        .collect::<String>();
+    let xml = format!("<Root>{body}</Root>").into_bytes();
+    let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+    let mixed = schema.mixed_content.as_ref().unwrap();
+    let field = &schema.fields[mixed.items_index].name;
+    let items = value.get(field).and_then(PolyValue::as_list).unwrap();
+    assert_eq!(items.len(), count);
+    for (i, item) in items.iter().enumerate() {
+        assert_eq!(item.get("value"), Some(&PolyValue::Int(i as i64)));
+        let kind = item.get("kind").and_then(PolyValue::as_str).unwrap();
+        let branch = mixed
+            .branches
+            .iter()
+            .find(|b| b.variant_name == kind)
+            .unwrap();
+        assert_eq!(branch.xml_name, format!("B{}", i % branches).as_bytes());
+    }
+    let output = serialize("Root", &value, &schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    (schema, xml)
+}
+
+
+fn main() {
+ for branches in [1,16,64,256] { for count in [1,1000] {
+  let (schema,xml)=fixture(branches,count);
+  let value=deserialize(&xml,Arc::clone(&schema)).unwrap();
+  for _ in 0..3 { black_box(serialize("Root",&value,&schema,None).unwrap()); }
+  ALLOCATIONS.store(0,Ordering::Relaxed);REALLOCATIONS.store(0,Ordering::Relaxed);BYTES.store(0,Ordering::Relaxed);
+  COUNTING.store(true,Ordering::Relaxed);
+  let output=serialize("Root",&value,&schema,None).unwrap();
+  COUNTING.store(false,Ordering::Relaxed);
+  println!("branches={branches},items={count},allocations={},reallocations={},requested_bytes={},output_bytes={}",ALLOCATIONS.load(Ordering::Relaxed),REALLOCATIONS.load(Ordering::Relaxed),BYTES.load(Ordering::Relaxed),output.len());
+ } }
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations-sampled/current-metadata.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations-sampled/current-metadata.json
new file mode 100644
index 0000000..681d48e
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations-sampled/current-metadata.json
@@ -0,0 +1,16 @@
+{
+  "revision": "58cb346f964b5196dfad62e8a62a8aa4beb9beef",
+  "items": [
+    1,
+    1000
+  ],
+  "branches": [
+    1,
+    16,
+    64,
+    256
+  ],
+  "operations": 1,
+  "warmup_operations": 3,
+  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)\nbinary: rustc\ncommit-hash: b940084d7eb6a299eb4bfeb8e34901bc051e7ac4\ncommit-date: 2026-09-28\nhost: x86_64-unknown-linux-gnu\nrelease: 1.99.0\nLLVM version: 23.1.1\n"
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations/baseline-Cargo.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations/baseline-Cargo.lock
new file mode 100644
index 0000000..897d8aa
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations/baseline-Cargo.lock
@@ -0,0 +1,317 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "aho-corasick"
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+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "branch-allocations"
+version = "0.0.0"
+dependencies = [
+ "polyxml",
+]
+
+[[package]]
+name = "fastrand"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+[[package]]
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+ "lexical-parse-float",
+ "lexical-parse-integer",
+ "lexical-util",
+ "lexical-write-float",
+ "lexical-write-integer",
+]
+
+[[package]]
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+ "lexical-parse-integer",
+ "lexical-util",
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+ "lexical-util",
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+[[package]]
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+[[package]]
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+ "lexical-util",
+ "lexical-write-integer",
+]
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+[[package]]
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+ "memo-map",
+ "serde",
+]
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+dependencies = [
+ "phf_generator",
+ "phf_shared",
+]
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+[[package]]
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+ "siphasher",
+]
+
+[[package]]
+name = "polyxml"
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+dependencies = [
+ "heck",
+ "lexical-core",
+ "memchr",
+ "minijinja",
+ "phf_codegen",
+ "quick-xml",
+ "regex",
+ "serde",
+ "serde_json",
+ "smallvec",
+ "thiserror",
+]
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+ "regex-syntax",
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+ "regex-syntax",
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+]
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+checksum = "67dca2c9c51e58a4791a4b1ed58308b39c64224d349a935ab5039aa360942a48"
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+ "syn",
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+ "serde",
+ "serde_core",
+ "zmij",
+]
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+ "quote",
+ "unicode-ident",
+]
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+
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+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
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+
+[[package]]
+name = "zmij"
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations/baseline-Cargo.toml b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations/baseline-Cargo.toml
new file mode 100644
index 0000000..b3146ec
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations/baseline-Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name="branch-allocations"
+version="0.0.0"
+edition="2021"
+[workspace]
+[dependencies]
+polyxml={path="/home/bailey/github/polyxml-perf-selected/crates/polyxml-core"}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations/baseline-allocations.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations/baseline-allocations.txt
new file mode 100644
index 0000000..62b3cf2
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations/baseline-allocations.txt
@@ -0,0 +1,9 @@
+memcap: <=7672 MiB (60% of 12786 MiB available) [systemd MemoryMax, swap off]
+branches=1,items=1,allocations=1,reallocations=0,requested_bytes=512,output_bytes=23
+branches=1,items=1000,allocations=1,reallocations=5,requested_bytes=32256,output_bytes=11903
+branches=16,items=1,allocations=1,reallocations=0,requested_bytes=512,output_bytes=23
+branches=16,items=1000,allocations=1,reallocations=5,requested_bytes=32256,output_bytes=12647
+branches=64,items=1,allocations=1,reallocations=0,requested_bytes=512,output_bytes=23
+branches=64,items=1000,allocations=1,reallocations=5,requested_bytes=32256,output_bytes=13583
+branches=256,items=1,allocations=1,reallocations=0,requested_bytes=512,output_bytes=23
+branches=256,items=1000,allocations=1,reallocations=5,requested_bytes=32256,output_bytes=15023
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations/baseline-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations/baseline-build.txt
new file mode 100644
index 0000000..d92d65f
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations/baseline-build.txt
@@ -0,0 +1,37 @@
+memcap: <=7737 MiB (60% of 12896 MiB available) [systemd MemoryMax, swap off]
+   Compiling proc-macro2 v1.0.107
+   Compiling unicode-ident v1.0.26
+   Compiling quote v1.0.47
+   Compiling syn v3.0.6
+   Compiling serde_core v1.0.229
+   Compiling memchr v2.8.3
+   Compiling lexical-util v1.0.7
+   Compiling serde v1.0.229
+   Compiling serde_derive v1.0.229
+   Compiling zmij v1.0.23
+   Compiling siphasher v1.0.4
+   Compiling phf_shared v0.14.0
+   Compiling lexical-write-integer v1.0.6
+   Compiling lexical-parse-integer v1.0.6
+   Compiling aho-corasick v1.1.5
+   Compiling regex-syntax v0.8.11
+   Compiling thiserror v2.0.21
+   Compiling serde_json v1.0.151
+   Compiling fastrand v2.5.0
+   Compiling phf_generator v0.14.0
+   Compiling regex-automata v0.4.18
+   Compiling lexical-parse-float v1.0.6
+   Compiling lexical-write-float v1.0.6
+   Compiling thiserror-impl v2.0.21
+   Compiling memo-map v0.3.4
+   Compiling itoa v1.0.18
+   Compiling minijinja v2.24.0
+   Compiling lexical-core v1.0.6
+   Compiling regex v1.13.1
+   Compiling phf_codegen v0.14.0
+   Compiling quick-xml v0.42.0
+   Compiling smallvec v1.16.2
+   Compiling heck v0.5.0
+   Compiling polyxml v0.34.6 (/home/bailey/github/polyxml-perf-selected/crates/polyxml-core)
+   Compiling branch-allocations v0.0.0 (/home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/branch-allocations-baseline)
+    Finished `release` profile [optimized] target(s) in 1m 05s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations/baseline-harness.rs b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations/baseline-harness.rs
new file mode 100644
index 0000000..c875031
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations/baseline-harness.rs
@@ -0,0 +1,89 @@
+use polyxml::schema::ModelSchema;
+use polyxml::schema_parser::XsdParser;
+use polyxml::{deserialize,serialize,PolyValue};
+use std::{hint::black_box,sync::Arc};
+use std::alloc::{GlobalAlloc, Layout, System};
+use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
+
+struct CountingAllocator;
+static COUNTING: AtomicBool = AtomicBool::new(false);
+static ALLOCATIONS: AtomicUsize = AtomicUsize::new(0);
+static REALLOCATIONS: AtomicUsize = AtomicUsize::new(0);
+static BYTES: AtomicUsize = AtomicUsize::new(0);
+
+// Diagnostic instrumentation only. The benchmark consumers use System directly.
+unsafe impl GlobalAlloc for CountingAllocator {
+    unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
+        if COUNTING.load(Ordering::Relaxed) {
+            ALLOCATIONS.fetch_add(1, Ordering::Relaxed);
+            BYTES.fetch_add(layout.size(), Ordering::Relaxed);
+        }
+        unsafe { System.alloc(layout) }
+    }
+    unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut u8 {
+        if COUNTING.load(Ordering::Relaxed) {
+            ALLOCATIONS.fetch_add(1, Ordering::Relaxed);
+            BYTES.fetch_add(layout.size(), Ordering::Relaxed);
+        }
+        unsafe { System.alloc_zeroed(layout) }
+    }
+    unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {
+        unsafe { System.dealloc(ptr, layout) }
+    }
+    unsafe fn realloc(&self, ptr: *mut u8, layout: Layout, new_size: usize) -> *mut u8 {
+        if COUNTING.load(Ordering::Relaxed) {
+            REALLOCATIONS.fetch_add(1, Ordering::Relaxed);
+            BYTES.fetch_add(new_size, Ordering::Relaxed);
+        }
+        unsafe { System.realloc(ptr, layout, new_size) }
+    }
+}
+#[global_allocator]
+static ALLOCATOR: CountingAllocator = CountingAllocator;
+
+fn fixture(branches: usize, count: usize) -> (Arc<ModelSchema>, Vec<u8>) {
+    let declarations = (0..branches)
+        .map(|i| format!(r#"<xs:element name="B{i}" type="xs:int"/>"#))
+        .collect::<String>();
+    let xsd = format!(
+        r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"><xs:element name="Root"><xs:complexType mixed="true"><xs:choice minOccurs="0" maxOccurs="unbounded">{declarations}</xs:choice></xs:complexType></xs:element></xs:schema>"#
+    );
+    let ir = XsdParser::new().parse_str(&xsd).unwrap();
+    let schema = ModelSchema::from_ir(&ir, Some("Root")).unwrap();
+    let body = (0..count)
+        .map(|i| format!("<B{}>{i}</B{}>", i % branches, i % branches))
+        .collect::<String>();
+    let xml = format!("<Root>{body}</Root>").into_bytes();
+    let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+    let mixed = schema.mixed_content.as_ref().unwrap();
+    let field = &schema.fields[mixed.items_index].name;
+    let items = value.get(field).and_then(PolyValue::as_list).unwrap();
+    assert_eq!(items.len(), count);
+    for (i, item) in items.iter().enumerate() {
+        assert_eq!(item.get("value"), Some(&PolyValue::Int(i as i64)));
+        let kind = item.get("kind").and_then(PolyValue::as_str).unwrap();
+        let branch = mixed
+            .branches
+            .iter()
+            .find(|b| b.variant_name == kind)
+            .unwrap();
+        assert_eq!(branch.xml_name, format!("B{}", i % branches).as_bytes());
+    }
+    let output = serialize("Root", &value, &schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    (schema, xml)
+}
+
+
+fn main() {
+ for branches in [1,16,64,256] { for count in [1,1000] {
+  let (schema,xml)=fixture(branches,count);
+  let value=deserialize(&xml,Arc::clone(&schema)).unwrap();
+  for _ in 0..3 { black_box(serialize("Root",&value,&schema,None).unwrap()); }
+  ALLOCATIONS.store(0,Ordering::Relaxed);REALLOCATIONS.store(0,Ordering::Relaxed);BYTES.store(0,Ordering::Relaxed);
+  COUNTING.store(true,Ordering::Relaxed);
+  let output=serialize("Root",&value,&schema,None).unwrap();
+  COUNTING.store(false,Ordering::Relaxed);
+  println!("branches={branches},items={count},allocations={},reallocations={},requested_bytes={},output_bytes={}",ALLOCATIONS.load(Ordering::Relaxed),REALLOCATIONS.load(Ordering::Relaxed),BYTES.load(Ordering::Relaxed),output.len());
+ } }
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations/baseline-metadata.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations/baseline-metadata.json
new file mode 100644
index 0000000..7053ee5
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations/baseline-metadata.json
@@ -0,0 +1,16 @@
+{
+  "revision": "1819c91b0808b9242c642d82350d2b657b60108c",
+  "items": [
+    1,
+    1000
+  ],
+  "branches": [
+    1,
+    16,
+    64,
+    256
+  ],
+  "operations": 1,
+  "warmup_operations": 3,
+  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)\nbinary: rustc\ncommit-hash: b940084d7eb6a299eb4bfeb8e34901bc051e7ac4\ncommit-date: 2026-09-28\nhost: x86_64-unknown-linux-gnu\nrelease: 1.99.0\nLLVM version: 23.1.1\n"
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations/current-Cargo.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations/current-Cargo.lock
new file mode 100644
index 0000000..897d8aa
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations/current-Cargo.lock
@@ -0,0 +1,317 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
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+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "branch-allocations"
+version = "0.0.0"
+dependencies = [
+ "polyxml",
+]
+
+[[package]]
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+ "lexical-write-float",
+ "lexical-write-integer",
+]
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+[[package]]
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+ "lexical-parse-integer",
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+ "siphasher",
+]
+
+[[package]]
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+dependencies = [
+ "heck",
+ "lexical-core",
+ "memchr",
+ "minijinja",
+ "phf_codegen",
+ "quick-xml",
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+ "serde",
+ "serde_json",
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+ "thiserror",
+]
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+ "regex-syntax",
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+]
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+]
+
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+ "syn",
+]
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+ "serde",
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+ "zmij",
+]
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+ "quote",
+ "unicode-ident",
+]
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+ "thiserror-impl",
+]
+
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+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
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+
+[[package]]
+name = "zmij"
+version = "1.0.23"
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations/current-Cargo.toml b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations/current-Cargo.toml
new file mode 100644
index 0000000..4788c05
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations/current-Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name="branch-allocations"
+version="0.0.0"
+edition="2021"
+[workspace]
+[dependencies]
+polyxml={path="/home/bailey/github/polyxml-mixed-index/crates/polyxml-core"}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations/current-allocations.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations/current-allocations.txt
new file mode 100644
index 0000000..0f9e9e8
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations/current-allocations.txt
@@ -0,0 +1,9 @@
+memcap: <=7652 MiB (60% of 12753 MiB available) [systemd MemoryMax, swap off]
+branches=1,items=1,allocations=1,reallocations=0,requested_bytes=512,output_bytes=23
+branches=1,items=1000,allocations=1,reallocations=5,requested_bytes=32256,output_bytes=11903
+branches=16,items=1,allocations=1,reallocations=0,requested_bytes=512,output_bytes=23
+branches=16,items=1000,allocations=1,reallocations=5,requested_bytes=32256,output_bytes=12647
+branches=64,items=1,allocations=1,reallocations=0,requested_bytes=512,output_bytes=23
+branches=64,items=1000,allocations=2,reallocations=5,requested_bytes=35472,output_bytes=13583
+branches=256,items=1,allocations=1,reallocations=0,requested_bytes=512,output_bytes=23
+branches=256,items=1000,allocations=2,reallocations=5,requested_bytes=45072,output_bytes=15023
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations/current-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations/current-build.txt
new file mode 100644
index 0000000..7d15b4a
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations/current-build.txt
@@ -0,0 +1,37 @@
+memcap: <=7700 MiB (60% of 12833 MiB available) [systemd MemoryMax, swap off]
+   Compiling proc-macro2 v1.0.107
+   Compiling unicode-ident v1.0.26
+   Compiling quote v1.0.47
+   Compiling syn v3.0.6
+   Compiling serde_core v1.0.229
+   Compiling memchr v2.8.3
+   Compiling lexical-util v1.0.7
+   Compiling serde v1.0.229
+   Compiling serde_derive v1.0.229
+   Compiling siphasher v1.0.4
+   Compiling zmij v1.0.23
+   Compiling phf_shared v0.14.0
+   Compiling lexical-write-integer v1.0.6
+   Compiling lexical-parse-integer v1.0.6
+   Compiling aho-corasick v1.1.5
+   Compiling serde_json v1.0.151
+   Compiling regex-syntax v0.8.11
+   Compiling thiserror v2.0.21
+   Compiling fastrand v2.5.0
+   Compiling phf_generator v0.14.0
+   Compiling regex-automata v0.4.18
+   Compiling lexical-parse-float v1.0.6
+   Compiling lexical-write-float v1.0.6
+   Compiling thiserror-impl v2.0.21
+   Compiling memo-map v0.3.4
+   Compiling itoa v1.0.18
+   Compiling minijinja v2.24.0
+   Compiling lexical-core v1.0.6
+   Compiling regex v1.13.1
+   Compiling phf_codegen v0.14.0
+   Compiling quick-xml v0.42.0
+   Compiling heck v0.5.0
+   Compiling smallvec v1.16.2
+   Compiling polyxml v0.34.6 (/home/bailey/github/polyxml-mixed-index/crates/polyxml-core)
+   Compiling branch-allocations v0.0.0 (/home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/branch-allocations-current)
+    Finished `release` profile [optimized] target(s) in 1m 05s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations/current-harness.rs b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations/current-harness.rs
new file mode 100644
index 0000000..c875031
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations/current-harness.rs
@@ -0,0 +1,89 @@
+use polyxml::schema::ModelSchema;
+use polyxml::schema_parser::XsdParser;
+use polyxml::{deserialize,serialize,PolyValue};
+use std::{hint::black_box,sync::Arc};
+use std::alloc::{GlobalAlloc, Layout, System};
+use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
+
+struct CountingAllocator;
+static COUNTING: AtomicBool = AtomicBool::new(false);
+static ALLOCATIONS: AtomicUsize = AtomicUsize::new(0);
+static REALLOCATIONS: AtomicUsize = AtomicUsize::new(0);
+static BYTES: AtomicUsize = AtomicUsize::new(0);
+
+// Diagnostic instrumentation only. The benchmark consumers use System directly.
+unsafe impl GlobalAlloc for CountingAllocator {
+    unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
+        if COUNTING.load(Ordering::Relaxed) {
+            ALLOCATIONS.fetch_add(1, Ordering::Relaxed);
+            BYTES.fetch_add(layout.size(), Ordering::Relaxed);
+        }
+        unsafe { System.alloc(layout) }
+    }
+    unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut u8 {
+        if COUNTING.load(Ordering::Relaxed) {
+            ALLOCATIONS.fetch_add(1, Ordering::Relaxed);
+            BYTES.fetch_add(layout.size(), Ordering::Relaxed);
+        }
+        unsafe { System.alloc_zeroed(layout) }
+    }
+    unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {
+        unsafe { System.dealloc(ptr, layout) }
+    }
+    unsafe fn realloc(&self, ptr: *mut u8, layout: Layout, new_size: usize) -> *mut u8 {
+        if COUNTING.load(Ordering::Relaxed) {
+            REALLOCATIONS.fetch_add(1, Ordering::Relaxed);
+            BYTES.fetch_add(new_size, Ordering::Relaxed);
+        }
+        unsafe { System.realloc(ptr, layout, new_size) }
+    }
+}
+#[global_allocator]
+static ALLOCATOR: CountingAllocator = CountingAllocator;
+
+fn fixture(branches: usize, count: usize) -> (Arc<ModelSchema>, Vec<u8>) {
+    let declarations = (0..branches)
+        .map(|i| format!(r#"<xs:element name="B{i}" type="xs:int"/>"#))
+        .collect::<String>();
+    let xsd = format!(
+        r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"><xs:element name="Root"><xs:complexType mixed="true"><xs:choice minOccurs="0" maxOccurs="unbounded">{declarations}</xs:choice></xs:complexType></xs:element></xs:schema>"#
+    );
+    let ir = XsdParser::new().parse_str(&xsd).unwrap();
+    let schema = ModelSchema::from_ir(&ir, Some("Root")).unwrap();
+    let body = (0..count)
+        .map(|i| format!("<B{}>{i}</B{}>", i % branches, i % branches))
+        .collect::<String>();
+    let xml = format!("<Root>{body}</Root>").into_bytes();
+    let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+    let mixed = schema.mixed_content.as_ref().unwrap();
+    let field = &schema.fields[mixed.items_index].name;
+    let items = value.get(field).and_then(PolyValue::as_list).unwrap();
+    assert_eq!(items.len(), count);
+    for (i, item) in items.iter().enumerate() {
+        assert_eq!(item.get("value"), Some(&PolyValue::Int(i as i64)));
+        let kind = item.get("kind").and_then(PolyValue::as_str).unwrap();
+        let branch = mixed
+            .branches
+            .iter()
+            .find(|b| b.variant_name == kind)
+            .unwrap();
+        assert_eq!(branch.xml_name, format!("B{}", i % branches).as_bytes());
+    }
+    let output = serialize("Root", &value, &schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    (schema, xml)
+}
+
+
+fn main() {
+ for branches in [1,16,64,256] { for count in [1,1000] {
+  let (schema,xml)=fixture(branches,count);
+  let value=deserialize(&xml,Arc::clone(&schema)).unwrap();
+  for _ in 0..3 { black_box(serialize("Root",&value,&schema,None).unwrap()); }
+  ALLOCATIONS.store(0,Ordering::Relaxed);REALLOCATIONS.store(0,Ordering::Relaxed);BYTES.store(0,Ordering::Relaxed);
+  COUNTING.store(true,Ordering::Relaxed);
+  let output=serialize("Root",&value,&schema,None).unwrap();
+  COUNTING.store(false,Ordering::Relaxed);
+  println!("branches={branches},items={count},allocations={},reallocations={},requested_bytes={},output_bytes={}",ALLOCATIONS.load(Ordering::Relaxed),REALLOCATIONS.load(Ordering::Relaxed),BYTES.load(Ordering::Relaxed),output.len());
+ } }
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations/current-metadata.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations/current-metadata.json
new file mode 100644
index 0000000..077ddef
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-allocations/current-metadata.json
@@ -0,0 +1,16 @@
+{
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/baseline-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/baseline-0.txt
new file mode 100644
index 0000000..d40ea5f
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/baseline-0.txt
@@ -0,0 +1,48 @@
+memcap: <=7659 MiB (60% of 12766 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_write/text/1000
+Benchmarking mixed_write/text/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/text/1000: Collecting 100 samples in estimated 5.0136 s (34k iterations)
+Benchmarking mixed_write/text/1000: Analyzing
+mixed_write/text/1000   time:   [144.37 µs 145.44 µs 146.94 µs]
+                        thrpt:  [187.59 MiB/s 189.53 MiB/s 190.93 MiB/s]
+Found 10 outliers among 100 measurements (10.00%)
+  2 (2.00%) high mild
+  8 (8.00%) high severe
+Benchmarking mixed_write/scalar/1000
+Benchmarking mixed_write/scalar/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/scalar/1000: Collecting 100 samples in estimated 5.0005 s (42k iterations)
+Benchmarking mixed_write/scalar/1000: Analyzing
+mixed_write/scalar/1000 time:   [118.54 µs 120.76 µs 124.16 µs]
+                        thrpt:  [321.85 MiB/s 330.92 MiB/s 337.10 MiB/s]
+Found 7 outliers among 100 measurements (7.00%)
+  4 (4.00%) high mild
+  3 (3.00%) high severe
+Benchmarking mixed_write/enum/1000
+Benchmarking mixed_write/enum/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/enum/1000: Collecting 100 samples in estimated 5.0004 s (61k iterations)
+Benchmarking mixed_write/enum/1000: Analyzing
+mixed_write/enum/1000   time:   [80.299 µs 80.605 µs 80.981 µs]
+                        thrpt:  [235.68 MiB/s 236.78 MiB/s 237.68 MiB/s]
+Found 8 outliers among 100 measurements (8.00%)
+  4 (4.00%) high mild
+  4 (4.00%) high severe
+Benchmarking mixed_write/pattern/1000
+Benchmarking mixed_write/pattern/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/pattern/1000: Collecting 100 samples in estimated 5.0072 s (34k iterations)
+Benchmarking mixed_write/pattern/1000: Analyzing
+mixed_write/pattern/1000
+                        time:   [144.80 µs 145.33 µs 145.98 µs]
+                        thrpt:  [124.21 MiB/s 124.77 MiB/s 125.22 MiB/s]
+Found 10 outliers among 100 measurements (10.00%)
+  7 (7.00%) high mild
+  3 (3.00%) high severe
+Benchmarking mixed_write/nested/1000
+Benchmarking mixed_write/nested/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/nested/1000: Collecting 100 samples in estimated 5.0039 s (50k iterations)
+Benchmarking mixed_write/nested/1000: Analyzing
+mixed_write/nested/1000 time:   [97.760 µs 98.080 µs 98.475 µs]
+                        thrpt:  [367.07 MiB/s 368.55 MiB/s 369.75 MiB/s]
+Found 7 outliers among 100 measurements (7.00%)
+  3 (3.00%) high mild
+  4 (4.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/baseline-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/baseline-1.txt
new file mode 100644
index 0000000..bda93d7
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/baseline-1.txt
@@ -0,0 +1,48 @@
+memcap: <=7703 MiB (60% of 12839 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_write/text/1000
+Benchmarking mixed_write/text/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/text/1000: Collecting 100 samples in estimated 5.0039 s (34k iterations)
+Benchmarking mixed_write/text/1000: Analyzing
+mixed_write/text/1000   time:   [144.77 µs 145.64 µs 146.67 µs]
+                        thrpt:  [187.94 MiB/s 189.26 MiB/s 190.40 MiB/s]
+Found 14 outliers among 100 measurements (14.00%)
+  4 (4.00%) high mild
+  10 (10.00%) high severe
+Benchmarking mixed_write/scalar/1000
+Benchmarking mixed_write/scalar/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/scalar/1000: Collecting 100 samples in estimated 5.0015 s (47k iterations)
+Benchmarking mixed_write/scalar/1000: Analyzing
+mixed_write/scalar/1000 time:   [105.61 µs 106.00 µs 106.44 µs]
+                        thrpt:  [375.46 MiB/s 377.00 MiB/s 378.39 MiB/s]
+Found 11 outliers among 100 measurements (11.00%)
+  5 (5.00%) high mild
+  6 (6.00%) high severe
+Benchmarking mixed_write/enum/1000
+Benchmarking mixed_write/enum/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/enum/1000: Collecting 100 samples in estimated 5.0068 s (62k iterations)
+Benchmarking mixed_write/enum/1000: Analyzing
+mixed_write/enum/1000   time:   [80.273 µs 80.769 µs 81.369 µs]
+                        thrpt:  [234.56 MiB/s 236.30 MiB/s 237.76 MiB/s]
+Found 6 outliers among 100 measurements (6.00%)
+  1 (1.00%) high mild
+  5 (5.00%) high severe
+Benchmarking mixed_write/pattern/1000
+Benchmarking mixed_write/pattern/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/pattern/1000: Collecting 100 samples in estimated 5.0037 s (34k iterations)
+Benchmarking mixed_write/pattern/1000: Analyzing
+mixed_write/pattern/1000
+                        time:   [143.93 µs 144.29 µs 144.73 µs]
+                        thrpt:  [125.28 MiB/s 125.66 MiB/s 125.98 MiB/s]
+Found 8 outliers among 100 measurements (8.00%)
+  4 (4.00%) high mild
+  4 (4.00%) high severe
+Benchmarking mixed_write/nested/1000
+Benchmarking mixed_write/nested/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/nested/1000: Collecting 100 samples in estimated 5.0029 s (51k iterations)
+Benchmarking mixed_write/nested/1000: Analyzing
+mixed_write/nested/1000 time:   [97.805 µs 98.449 µs 99.344 µs]
+                        thrpt:  [363.86 MiB/s 367.17 MiB/s 369.58 MiB/s]
+Found 14 outliers among 100 measurements (14.00%)
+  7 (7.00%) high mild
+  7 (7.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/baseline-2.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/baseline-2.txt
new file mode 100644
index 0000000..086fdea
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/baseline-2.txt
@@ -0,0 +1,48 @@
+memcap: <=7707 MiB (60% of 12845 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_write/text/1000
+Benchmarking mixed_write/text/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/text/1000: Collecting 100 samples in estimated 5.0070 s (34k iterations)
+Benchmarking mixed_write/text/1000: Analyzing
+mixed_write/text/1000   time:   [144.56 µs 145.33 µs 146.28 µs]
+                        thrpt:  [188.44 MiB/s 189.67 MiB/s 190.67 MiB/s]
+Found 8 outliers among 100 measurements (8.00%)
+  3 (3.00%) high mild
+  5 (5.00%) high severe
+Benchmarking mixed_write/scalar/1000
+Benchmarking mixed_write/scalar/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/scalar/1000: Collecting 100 samples in estimated 5.0037 s (52k iterations)
+Benchmarking mixed_write/scalar/1000: Analyzing
+mixed_write/scalar/1000 time:   [94.106 µs 94.703 µs 95.447 µs]
+                        thrpt:  [418.68 MiB/s 421.97 MiB/s 424.65 MiB/s]
+Found 11 outliers among 100 measurements (11.00%)
+  3 (3.00%) high mild
+  8 (8.00%) high severe
+Benchmarking mixed_write/enum/1000
+Benchmarking mixed_write/enum/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/enum/1000: Collecting 100 samples in estimated 5.0067 s (63k iterations)
+Benchmarking mixed_write/enum/1000: Analyzing
+mixed_write/enum/1000   time:   [79.355 µs 79.863 µs 80.490 µs]
+                        thrpt:  [237.12 MiB/s 238.98 MiB/s 240.51 MiB/s]
+Found 11 outliers among 100 measurements (11.00%)
+  2 (2.00%) high mild
+  9 (9.00%) high severe
+Benchmarking mixed_write/pattern/1000
+Benchmarking mixed_write/pattern/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/pattern/1000: Collecting 100 samples in estimated 5.0006 s (35k iterations)
+Benchmarking mixed_write/pattern/1000: Analyzing
+mixed_write/pattern/1000
+                        time:   [142.89 µs 144.25 µs 146.07 µs]
+                        thrpt:  [124.13 MiB/s 125.70 MiB/s 126.89 MiB/s]
+Found 10 outliers among 100 measurements (10.00%)
+  3 (3.00%) high mild
+  7 (7.00%) high severe
+Benchmarking mixed_write/nested/1000
+Benchmarking mixed_write/nested/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/nested/1000: Collecting 100 samples in estimated 5.0045 s (50k iterations)
+Benchmarking mixed_write/nested/1000: Analyzing
+mixed_write/nested/1000 time:   [97.124 µs 97.760 µs 98.507 µs]
+                        thrpt:  [366.95 MiB/s 369.75 MiB/s 372.18 MiB/s]
+Found 11 outliers among 100 measurements (11.00%)
+  2 (2.00%) high mild
+  9 (9.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/baseline-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/baseline-build.txt
new file mode 100644
index 0000000..389d232
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/baseline-build.txt
@@ -0,0 +1,3 @@
+memcap: <=7707 MiB (60% of 12845 MiB available) [systemd MemoryMax, swap off]
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+    Finished `bench` profile [optimized] target(s) in 2.85s
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new file mode 100644
index 0000000..78a11b2
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/criterion-SHA256SUMS b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/criterion-SHA256SUMS
new file mode 100644
index 0000000..eacdee1
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/criterion-SHA256SUMS
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/criterion-results.tar.gz b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/criterion-results.tar.gz
new file mode 100644
index 0000000..6542600
Binary files /dev/null and b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/criterion-results.tar.gz differ
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/current-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/current-0.txt
new file mode 100644
index 0000000..182db68
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/current-0.txt
@@ -0,0 +1,48 @@
+memcap: <=7702 MiB (60% of 12837 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_write/text/1000
+Benchmarking mixed_write/text/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/text/1000: Collecting 100 samples in estimated 5.0007 s (36k iterations)
+Benchmarking mixed_write/text/1000: Analyzing
+mixed_write/text/1000   time:   [136.84 µs 137.72 µs 139.05 µs]
+                        thrpt:  [198.23 MiB/s 200.15 MiB/s 201.44 MiB/s]
+Found 11 outliers among 100 measurements (11.00%)
+  4 (4.00%) high mild
+  7 (7.00%) high severe
+Benchmarking mixed_write/scalar/1000
+Benchmarking mixed_write/scalar/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/scalar/1000: Collecting 100 samples in estimated 5.0000 s (47k iterations)
+Benchmarking mixed_write/scalar/1000: Analyzing
+mixed_write/scalar/1000 time:   [104.87 µs 105.68 µs 106.67 µs]
+                        thrpt:  [374.62 MiB/s 378.14 MiB/s 381.06 MiB/s]
+Found 13 outliers among 100 measurements (13.00%)
+  5 (5.00%) high mild
+  8 (8.00%) high severe
+Benchmarking mixed_write/enum/1000
+Benchmarking mixed_write/enum/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/enum/1000: Collecting 100 samples in estimated 5.0030 s (65k iterations)
+Benchmarking mixed_write/enum/1000: Analyzing
+mixed_write/enum/1000   time:   [77.012 µs 77.849 µs 78.820 µs]
+                        thrpt:  [242.14 MiB/s 245.17 MiB/s 247.83 MiB/s]
+Found 14 outliers among 100 measurements (14.00%)
+  5 (5.00%) high mild
+  9 (9.00%) high severe
+Benchmarking mixed_write/pattern/1000
+Benchmarking mixed_write/pattern/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/pattern/1000: Collecting 100 samples in estimated 5.0072 s (36k iterations)
+Benchmarking mixed_write/pattern/1000: Analyzing
+mixed_write/pattern/1000
+                        time:   [136.30 µs 136.81 µs 137.37 µs]
+                        thrpt:  [132.00 MiB/s 132.54 MiB/s 133.03 MiB/s]
+Found 5 outliers among 100 measurements (5.00%)
+  3 (3.00%) high mild
+  2 (2.00%) high severe
+Benchmarking mixed_write/nested/1000
+Benchmarking mixed_write/nested/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/nested/1000: Collecting 100 samples in estimated 5.0013 s (52k iterations)
+Benchmarking mixed_write/nested/1000: Analyzing
+mixed_write/nested/1000 time:   [94.860 µs 95.425 µs 96.085 µs]
+                        thrpt:  [376.20 MiB/s 378.80 MiB/s 381.06 MiB/s]
+Found 9 outliers among 100 measurements (9.00%)
+  2 (2.00%) high mild
+  7 (7.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/current-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/current-1.txt
new file mode 100644
index 0000000..bfee361
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/current-1.txt
@@ -0,0 +1,48 @@
+memcap: <=7705 MiB (60% of 12842 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_write/text/1000
+Benchmarking mixed_write/text/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/text/1000: Collecting 100 samples in estimated 5.0038 s (36k iterations)
+Benchmarking mixed_write/text/1000: Analyzing
+mixed_write/text/1000   time:   [138.69 µs 139.87 µs 141.27 µs]
+                        thrpt:  [195.11 MiB/s 197.07 MiB/s 198.75 MiB/s]
+Found 12 outliers among 100 measurements (12.00%)
+  4 (4.00%) high mild
+  8 (8.00%) high severe
+Benchmarking mixed_write/scalar/1000
+Benchmarking mixed_write/scalar/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/scalar/1000: Collecting 100 samples in estimated 5.0065 s (48k iterations)
+Benchmarking mixed_write/scalar/1000: Analyzing
+mixed_write/scalar/1000 time:   [102.91 µs 104.04 µs 105.69 µs]
+                        thrpt:  [378.12 MiB/s 384.10 MiB/s 388.34 MiB/s]
+Found 8 outliers among 100 measurements (8.00%)
+  4 (4.00%) high mild
+  4 (4.00%) high severe
+Benchmarking mixed_write/enum/1000
+Benchmarking mixed_write/enum/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/enum/1000: Collecting 100 samples in estimated 5.0019 s (66k iterations)
+Benchmarking mixed_write/enum/1000: Analyzing
+mixed_write/enum/1000   time:   [74.761 µs 75.162 µs 75.684 µs]
+                        thrpt:  [252.18 MiB/s 253.93 MiB/s 255.29 MiB/s]
+Found 7 outliers among 100 measurements (7.00%)
+  3 (3.00%) high mild
+  4 (4.00%) high severe
+Benchmarking mixed_write/pattern/1000
+Benchmarking mixed_write/pattern/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/pattern/1000: Collecting 100 samples in estimated 5.0028 s (36k iterations)
+Benchmarking mixed_write/pattern/1000: Analyzing
+mixed_write/pattern/1000
+                        time:   [135.88 µs 136.50 µs 137.24 µs]
+                        thrpt:  [132.12 MiB/s 132.84 MiB/s 133.45 MiB/s]
+Found 7 outliers among 100 measurements (7.00%)
+  2 (2.00%) high mild
+  5 (5.00%) high severe
+Benchmarking mixed_write/nested/1000
+Benchmarking mixed_write/nested/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/nested/1000: Collecting 100 samples in estimated 5.0066 s (51k iterations)
+Benchmarking mixed_write/nested/1000: Analyzing
+mixed_write/nested/1000 time:   [96.368 µs 97.061 µs 98.046 µs]
+                        thrpt:  [368.68 MiB/s 372.42 MiB/s 375.09 MiB/s]
+Found 11 outliers among 100 measurements (11.00%)
+  7 (7.00%) high mild
+  4 (4.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/current-2.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/current-2.txt
new file mode 100644
index 0000000..0a4d1dc
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/current-2.txt
@@ -0,0 +1,48 @@
+memcap: <=7707 MiB (60% of 12845 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_write/text/1000
+Benchmarking mixed_write/text/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/text/1000: Collecting 100 samples in estimated 5.0105 s (36k iterations)
+Benchmarking mixed_write/text/1000: Analyzing
+mixed_write/text/1000   time:   [137.53 µs 138.00 µs 138.54 µs]
+                        thrpt:  [198.96 MiB/s 199.74 MiB/s 200.42 MiB/s]
+Found 6 outliers among 100 measurements (6.00%)
+  2 (2.00%) high mild
+  4 (4.00%) high severe
+Benchmarking mixed_write/scalar/1000
+Benchmarking mixed_write/scalar/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/scalar/1000: Collecting 100 samples in estimated 5.0046 s (53k iterations)
+Benchmarking mixed_write/scalar/1000: Analyzing
+mixed_write/scalar/1000 time:   [94.890 µs 95.547 µs 96.352 µs]
+                        thrpt:  [414.75 MiB/s 418.24 MiB/s 421.14 MiB/s]
+Found 14 outliers among 100 measurements (14.00%)
+  5 (5.00%) high mild
+  9 (9.00%) high severe
+Benchmarking mixed_write/enum/1000
+Benchmarking mixed_write/enum/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/enum/1000: Collecting 100 samples in estimated 5.0059 s (66k iterations)
+Benchmarking mixed_write/enum/1000: Analyzing
+mixed_write/enum/1000   time:   [76.177 µs 77.003 µs 77.959 µs]
+                        thrpt:  [244.82 MiB/s 247.86 MiB/s 250.55 MiB/s]
+Found 18 outliers among 100 measurements (18.00%)
+  8 (8.00%) high mild
+  10 (10.00%) high severe
+Benchmarking mixed_write/pattern/1000
+Benchmarking mixed_write/pattern/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/pattern/1000: Collecting 100 samples in estimated 5.0107 s (37k iterations)
+Benchmarking mixed_write/pattern/1000: Analyzing
+mixed_write/pattern/1000
+                        time:   [135.71 µs 136.26 µs 136.91 µs]
+                        thrpt:  [132.44 MiB/s 133.07 MiB/s 133.61 MiB/s]
+Found 8 outliers among 100 measurements (8.00%)
+  4 (4.00%) high mild
+  4 (4.00%) high severe
+Benchmarking mixed_write/nested/1000
+Benchmarking mixed_write/nested/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/nested/1000: Collecting 100 samples in estimated 5.0074 s (53k iterations)
+Benchmarking mixed_write/nested/1000: Analyzing
+mixed_write/nested/1000 time:   [95.415 µs 96.108 µs 96.975 µs]
+                        thrpt:  [372.75 MiB/s 376.11 MiB/s 378.84 MiB/s]
+Found 15 outliers among 100 measurements (15.00%)
+  6 (6.00%) high mild
+  9 (9.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/current-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/current-build.txt
new file mode 100644
index 0000000..793a9aa
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/current-build.txt
@@ -0,0 +1,3 @@
+memcap: <=7659 MiB (60% of 12766 MiB available) [systemd MemoryMax, swap off]
+   Compiling core-regression v0.0.0 (/home/bailey/github/polyxml-mixed-index/benchmarks/rust-xml-regression/target/core-current)
+    Finished `bench` profile [optimized] target(s) in 2.79s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/current.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/current.lock
new file mode 100644
index 0000000..78a11b2
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/harness.rs b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/harness.rs
new file mode 100644
index 0000000..7d0413e
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/harness.rs
@@ -0,0 +1,120 @@
+use criterion::{
+    criterion_group, criterion_main, BenchmarkId, Criterion, SamplingMode, Throughput,
+};
+use polyxml::schema::ModelSchema;
+use polyxml::schema_parser::XsdParser;
+use polyxml::{deserialize, serialize, PolyValue};
+use std::{hint::black_box, sync::Arc};
+
+fn fixture(kind: &str, count: usize) -> (Arc<ModelSchema>, Vec<u8>) {
+    let xsd = r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
+      <xs:simpleType name="State"><xs:restriction base="xs:string"><xs:enumeration value="Ready"/><xs:enumeration value="Done"/></xs:restriction></xs:simpleType>
+      <xs:simpleType name="Code"><xs:restriction base="xs:string"><xs:pattern value="[A-Z]{3}[0-9]{3}"/></xs:restriction></xs:simpleType>
+      <xs:element name="Root"><xs:complexType mixed="true"><xs:choice minOccurs="0" maxOccurs="unbounded">
+        <xs:element name="Text" type="xs:string"/>
+        <xs:element name="Number" type="xs:int"/>
+        <xs:element name="State" type="State"/>
+        <xs:element name="Code" type="Code"/>
+        <xs:element name="Child"><xs:complexType><xs:sequence><xs:element name="Value" type="xs:string"/></xs:sequence></xs:complexType></xs:element>
+      </xs:choice></xs:complexType></xs:element>
+    </xs:schema>"#;
+    let ir = XsdParser::new().parse_str(xsd).unwrap();
+    let schema = ModelSchema::from_ir(&ir, Some("Root")).unwrap();
+    let mut xml = String::from("<Root>");
+    for index in 0..count {
+        let part = match kind {
+            "text" => format!("text-{index}&amp;<![CDATA[more]]>"),
+            "scalar" => format!("<Text>item-{index}&amp;<![CDATA[more]]></Text>"),
+            "enum" => "<State>Ready</State>".into(),
+            "pattern" => format!("<Code>ABC{:03}</Code>", index % 1000),
+            "nested" => format!("<Child><Value>item-{index}</Value></Child>"),
+            _ => unreachable!(),
+        };
+        xml.push_str(&part);
+    }
+    xml.push_str("</Root>");
+    let value = deserialize(xml.as_bytes(), Arc::clone(&schema)).unwrap();
+    let items_name = &schema.fields[schema.mixed_content.as_ref().unwrap().items_index].name;
+    let items = value.get(items_name).and_then(PolyValue::as_list).unwrap();
+    if kind == "text" {
+        // Text, GeneralRef and CData become separate ordered items.
+        assert_eq!(items.len(), count * 3);
+        for (index, items) in items.chunks_exact(3).enumerate() {
+            for (item, expected) in
+                items
+                    .iter()
+                    .zip([format!("text-{index}"), "&".into(), "more".into()])
+            {
+                assert_eq!(item.get("kind").and_then(PolyValue::as_str), Some("#text"));
+                assert_eq!(
+                    item.get("value").and_then(PolyValue::as_str),
+                    Some(expected.as_str())
+                );
+            }
+        }
+    } else {
+        assert_eq!(items.len(), count);
+        for (index, item) in items.iter().enumerate() {
+            let value = item.get("value").unwrap();
+            match kind {
+                "scalar" => assert_eq!(value.as_str(), Some(format!("item-{index}&more").as_str())),
+                "enum" => assert_eq!(value.as_str(), Some("Ready")),
+                "pattern" => assert_eq!(
+                    value.as_str(),
+                    Some(format!("ABC{:03}", index % 1000).as_str())
+                ),
+                "nested" => assert_eq!(
+                    value.get("value").and_then(PolyValue::as_str),
+                    Some(format!("item-{index}").as_str())
+                ),
+                _ => unreachable!(),
+            }
+        }
+    }
+    let output = serialize("Root", &value, &schema, None).unwrap();
+    let reparsed = deserialize(&output, Arc::clone(&schema)).unwrap();
+    if kind == "text" {
+        // XML writers coalesce adjacent text segments. Compare their text value
+        // rather than treating the reader's segmentation as XML semantics.
+        let text = |value: &PolyValue| -> String {
+            value
+                .get(items_name)
+                .unwrap()
+                .as_list()
+                .unwrap()
+                .iter()
+                .map(|item| item.get("value").unwrap().as_str().unwrap())
+                .collect()
+        };
+        assert_eq!(text(&value), text(&reparsed));
+    } else {
+        assert_eq!(value, reparsed);
+    }
+    (schema, xml.into_bytes())
+}
+
+fn benchmarks(c: &mut Criterion) {
+    for operation in ["mixed_read", "mixed_write"] {
+        let mut group = c.benchmark_group(operation);
+        group.sampling_mode(SamplingMode::Flat);
+        for kind in ["text", "scalar", "enum", "pattern", "nested"] {
+            let (schema, xml) = fixture(kind, 1000);
+            let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+            group.throughput(Throughput::Bytes(xml.len() as u64));
+            group.bench_function(BenchmarkId::new(kind, 1000), |b| {
+                if operation == "mixed_read" {
+                    b.iter(|| {
+                        black_box(deserialize(black_box(&xml), Arc::clone(&schema)).unwrap())
+                    });
+                } else {
+                    b.iter(|| {
+                        black_box(serialize("Root", black_box(&value), &schema, None).unwrap())
+                    });
+                }
+            });
+        }
+        group.finish();
+    }
+}
+criterion_group!(benches, benchmarks);
+criterion_main!(benches);
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/metadata.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/metadata.json
new file mode 100644
index 0000000..3e759f2
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/metadata.json
@@ -0,0 +1,19 @@
+{
+  "revisions": {
+    "baseline": "1819c91b0808b9242c642d82350d2b657b60108c",
+    "current": "58cb346f964b5196dfad62e8a62a8aa4beb9beef"
+  },
+  "core_status": {
+    "baseline": "",
+    "current": ""
+  },
+  "sample_size": 100,
+  "warmup_seconds": 3.0,
+  "measurement_seconds": 5.0,
+  "rounds": 3,
+  "filter": "^mixed_write/",
+  "order": "alternate baseline/current per round",
+  "os": "Linux-6.18.40.1-microsoft-standard-WSL2-x86_64-with-glibc2.43",
+  "cpu": "11th Gen Intel(R) Core(TM) i5-11600K @ 3.90GHz",
+  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)\nbinary: rustc\ncommit-hash: b940084d7eb6a299eb4bfeb8e34901bc051e7ac4\ncommit-date: 2026-09-28\nhost: x86_64-unknown-linux-gnu\nrelease: 1.99.0\nLLVM version: 23.1.1\n"
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/summary.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/summary.json
new file mode 100644
index 0000000..edb0025
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common-sampled/summary.json
@@ -0,0 +1,357 @@
+{
+  "mixed_write/enum/1000": {
+    "baseline_ns": 80605.41379537959,
+    "candidate_ns": 77003.08932228915,
+    "delta_percent": -4.469085019816532,
+    "speedup": 1.0467815577893667,
+    "process_deltas_percent": [
+      -3.4197982804833105,
+      -6.942078239819727,
+      -3.5807587525168882
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 80299.25736922443,
+            "upper_bound": 80980.58653341586
+          },
+          "point_estimate": 80605.41379537959,
+          "standard_error": 174.6423910264313
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 80273.16555348462,
+            "upper_bound": 81369.33672366288
+          },
+          "point_estimate": 80768.76735818476,
+          "standard_error": 281.5817411394025
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 79355.34950553799,
+            "upper_bound": 80490.23173773731
+          },
+          "point_estimate": 79862.7829113924,
+          "standard_error": 291.630293016041
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 77011.79812366002,
+            "upper_bound": 78820.16660183764
+          },
+          "point_estimate": 77848.87124042874,
+          "standard_error": 462.43024178247896
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 74761.14801432882,
+            "upper_bound": 75683.617142911
+          },
+          "point_estimate": 75161.7363348416,
+          "standard_error": 236.98779480126768
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 76176.7094318524,
+            "upper_bound": 77959.4278614458
+          },
+          "point_estimate": 77003.08932228915,
+          "standard_error": 456.74770533626946
+        }
+      ]
+    }
+  },
+  "mixed_write/nested/1000": {
+    "baseline_ns": 98080.12799603172,
+    "candidate_ns": 96107.74948669203,
+    "delta_percent": -2.0109868835198608,
+    "speedup": 1.0205225751292075,
+    "process_deltas_percent": [
+      -2.7073174346968543,
+      -1.4096765856766114,
+      -1.6905357440217372
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 97760.00178075401,
+            "upper_bound": 98474.95281696432
+          },
+          "point_estimate": 98080.12799603172,
+          "standard_error": 183.77360902681713
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 97805.44832170925,
+            "upper_bound": 99343.8564277996
+          },
+          "point_estimate": 98449.09275049118,
+          "standard_error": 398.5962914257458
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 97123.70496130956,
+            "upper_bound": 98507.22277331348
+          },
+          "point_estimate": 97760.42440476188,
+          "standard_error": 353.6183443463611
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 94860.39916108988,
+            "upper_bound": 96085.11826481833
+          },
+          "point_estimate": 95424.78759082216,
+          "standard_error": 313.7349421856039
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 96368.103822549,
+            "upper_bound": 98046.01219705888
+          },
+          "point_estimate": 97061.27894117645,
+          "standard_error": 437.696613250102
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 95414.52519676808,
+            "upper_bound": 96974.91226283272
+          },
+          "point_estimate": 96107.74948669203,
+          "standard_error": 399.85236632155966
+        }
+      ]
+    }
+  },
+  "mixed_write/pattern/1000": {
+    "baseline_ns": 144292.46912790695,
+    "candidate_ns": 136500.09766483514,
+    "delta_percent": -5.400400665515215,
+    "speedup": 1.057086929580119,
+    "process_deltas_percent": [
+      -5.8642675391949,
+      -5.400400665515215,
+      -5.537762282933912
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 144798.25790044243,
+            "upper_bound": 145977.57148598824
+          },
+          "point_estimate": 145327.47386430678,
+          "standard_error": 303.4800211412887
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 143929.27314607566,
+            "upper_bound": 144729.6762819768
+          },
+          "point_estimate": 144292.46912790695,
+          "standard_error": 204.96122160539093
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 142893.7255795129,
+            "upper_bound": 146073.5743782235
+          },
+          "point_estimate": 144248.7153295129,
+          "standard_error": 823.0635656304541
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 136301.8419792818,
+            "upper_bound": 137365.80607389504
+          },
+          "point_estimate": 136805.0819889503,
+          "standard_error": 272.8051210096864
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 135877.3712445055,
+            "upper_bound": 137242.78083447806
+          },
+          "point_estimate": 136500.09766483514,
+          "standard_error": 349.77596295883916
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 135707.92078108108,
+            "upper_bound": 136907.7942466216
+          },
+          "point_estimate": 136260.56437837842,
+          "standard_error": 307.1254387593365
+        }
+      ]
+    }
+  },
+  "mixed_write/scalar/1000": {
+    "baseline_ns": 105999.19989361706,
+    "candidate_ns": 104040.42302277431,
+    "delta_percent": -1.8479166567376137,
+    "speedup": 1.0188270752264625,
+    "process_deltas_percent": [
+      -12.489415693419737,
+      -1.8479166567376137,
+      0.8920096818298306
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 118544.19815467625,
+            "upper_bound": 124163.33187829737
+          },
+          "point_estimate": 120761.38760191847,
+          "standard_error": 1501.6317365060381
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 105610.66962978725,
+            "upper_bound": 106435.4447340426
+          },
+          "point_estimate": 105999.19989361706,
+          "standard_error": 210.14868138039745
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 94105.64898187027,
+            "upper_bound": 95447.3673125
+          },
+          "point_estimate": 94702.51400763362,
+          "standard_error": 345.6718740084271
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 104869.26046466247,
+            "upper_bound": 106673.22133649793
+          },
+          "point_estimate": 105678.99590717303,
+          "standard_error": 460.868235223171
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 102905.07908074529,
+            "upper_bound": 105686.8481495859
+          },
+          "point_estimate": 104040.42302277431,
+          "standard_error": 727.8199977682528
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 94890.44879269451,
+            "upper_bound": 96351.79131593928
+          },
+          "point_estimate": 95547.26960151797,
+          "standard_error": 373.78148033457285
+        }
+      ]
+    }
+  },
+  "mixed_write/text/1000": {
+    "baseline_ns": 145435.18029239762,
+    "candidate_ns": 138002.92974860332,
+    "delta_percent": -5.110352618157277,
+    "speedup": 1.0538557446376933,
+    "process_deltas_percent": [
+      -5.306256794878239,
+      -3.963856467379756,
+      -5.038633888261945
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 144366.43207383042,
+            "upper_bound": 146935.30283333332
+          },
+          "point_estimate": 145435.18029239762,
+          "standard_error": 666.1173942311058
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 144766.41907681155,
+            "upper_bound": 146665.52380942027
+          },
+          "point_estimate": 145641.3069565218,
+          "standard_error": 486.77289495081675
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 144563.06917055388,
+            "upper_bound": 146277.53294970843
+          },
+          "point_estimate": 145325.34166180762,
+          "standard_error": 440.67775981226407
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 136837.1171455432,
+            "upper_bound": 139049.5217876045
+          },
+          "point_estimate": 137718.01615598885,
+          "standard_error": 584.8017940029177
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 138690.3314725352,
+            "upper_bound": 141272.03605211267
+          },
+          "point_estimate": 139868.2945915493,
+          "standard_error": 663.842491197093
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 137528.1408072625,
+            "upper_bound": 138541.1055642459
+          },
+          "point_estimate": 138002.92974860332,
+          "standard_error": 258.3452880878344
+        }
+      ]
+    }
+  }
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/baseline-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/baseline-0.txt
new file mode 100644
index 0000000..78139bd
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/baseline-0.txt
@@ -0,0 +1,48 @@
+memcap: <=7653 MiB (60% of 12755 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_write/text/1000
+Benchmarking mixed_write/text/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/text/1000: Collecting 100 samples in estimated 5.0052 s (33k iterations)
+Benchmarking mixed_write/text/1000: Analyzing
+mixed_write/text/1000   time:   [145.39 µs 146.07 µs 146.87 µs]
+                        thrpt:  [187.67 MiB/s 188.70 MiB/s 189.59 MiB/s]
+Found 9 outliers among 100 measurements (9.00%)
+  4 (4.00%) high mild
+  5 (5.00%) high severe
+Benchmarking mixed_write/scalar/1000
+Benchmarking mixed_write/scalar/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/scalar/1000: Collecting 100 samples in estimated 5.0088 s (51k iterations)
+Benchmarking mixed_write/scalar/1000: Analyzing
+mixed_write/scalar/1000 time:   [97.011 µs 97.772 µs 98.773 µs]
+                        thrpt:  [404.58 MiB/s 408.73 MiB/s 411.93 MiB/s]
+Found 8 outliers among 100 measurements (8.00%)
+  4 (4.00%) high mild
+  4 (4.00%) high severe
+Benchmarking mixed_write/enum/1000
+Benchmarking mixed_write/enum/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/enum/1000: Collecting 100 samples in estimated 5.0067 s (62k iterations)
+Benchmarking mixed_write/enum/1000: Analyzing
+mixed_write/enum/1000   time:   [80.483 µs 81.261 µs 82.404 µs]
+                        thrpt:  [231.61 MiB/s 234.87 MiB/s 237.14 MiB/s]
+Found 9 outliers among 100 measurements (9.00%)
+  3 (3.00%) high mild
+  6 (6.00%) high severe
+Benchmarking mixed_write/pattern/1000
+Benchmarking mixed_write/pattern/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/pattern/1000: Collecting 100 samples in estimated 5.0077 s (31k iterations)
+Benchmarking mixed_write/pattern/1000: Analyzing
+mixed_write/pattern/1000
+                        time:   [144.18 µs 145.49 µs 147.39 µs]
+                        thrpt:  [123.02 MiB/s 124.63 MiB/s 125.76 MiB/s]
+Found 8 outliers among 100 measurements (8.00%)
+  4 (4.00%) high mild
+  4 (4.00%) high severe
+Benchmarking mixed_write/nested/1000
+Benchmarking mixed_write/nested/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/nested/1000: Collecting 100 samples in estimated 5.0072 s (51k iterations)
+Benchmarking mixed_write/nested/1000: Analyzing
+mixed_write/nested/1000 time:   [97.941 µs 98.228 µs 98.549 µs]
+                        thrpt:  [366.79 MiB/s 367.99 MiB/s 369.07 MiB/s]
+Found 9 outliers among 100 measurements (9.00%)
+  7 (7.00%) high mild
+  2 (2.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/baseline-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/baseline-1.txt
new file mode 100644
index 0000000..d5f479e
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/baseline-1.txt
@@ -0,0 +1,47 @@
+memcap: <=7730 MiB (60% of 12884 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_write/text/1000
+Benchmarking mixed_write/text/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/text/1000: Collecting 100 samples in estimated 5.0043 s (34k iterations)
+Benchmarking mixed_write/text/1000: Analyzing
+mixed_write/text/1000   time:   [143.73 µs 144.82 µs 146.26 µs]
+                        thrpt:  [188.46 MiB/s 190.34 MiB/s 191.78 MiB/s]
+Found 9 outliers among 100 measurements (9.00%)
+  1 (1.00%) high mild
+  8 (8.00%) high severe
+Benchmarking mixed_write/scalar/1000
+Benchmarking mixed_write/scalar/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/scalar/1000: Collecting 100 samples in estimated 5.0025 s (52k iterations)
+Benchmarking mixed_write/scalar/1000: Analyzing
+mixed_write/scalar/1000 time:   [96.806 µs 97.139 µs 97.521 µs]
+                        thrpt:  [409.78 MiB/s 411.39 MiB/s 412.80 MiB/s]
+Found 6 outliers among 100 measurements (6.00%)
+  6 (6.00%) high severe
+Benchmarking mixed_write/enum/1000
+Benchmarking mixed_write/enum/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/enum/1000: Collecting 100 samples in estimated 5.0064 s (62k iterations)
+Benchmarking mixed_write/enum/1000: Analyzing
+mixed_write/enum/1000   time:   [80.274 µs 81.011 µs 81.911 µs]
+                        thrpt:  [233.01 MiB/s 235.60 MiB/s 237.76 MiB/s]
+Found 13 outliers among 100 measurements (13.00%)
+  6 (6.00%) high mild
+  7 (7.00%) high severe
+Benchmarking mixed_write/pattern/1000
+Benchmarking mixed_write/pattern/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/pattern/1000: Collecting 100 samples in estimated 5.0062 s (35k iterations)
+Benchmarking mixed_write/pattern/1000: Analyzing
+mixed_write/pattern/1000
+                        time:   [144.52 µs 145.54 µs 146.79 µs]
+                        thrpt:  [123.52 MiB/s 124.59 MiB/s 125.46 MiB/s]
+Found 15 outliers among 100 measurements (15.00%)
+  3 (3.00%) high mild
+  12 (12.00%) high severe
+Benchmarking mixed_write/nested/1000
+Benchmarking mixed_write/nested/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/nested/1000: Collecting 100 samples in estimated 5.0094 s (50k iterations)
+Benchmarking mixed_write/nested/1000: Analyzing
+mixed_write/nested/1000 time:   [98.324 µs 98.687 µs 99.100 µs]
+                        thrpt:  [364.75 MiB/s 366.28 MiB/s 367.63 MiB/s]
+Found 11 outliers among 100 measurements (11.00%)
+  5 (5.00%) high mild
+  6 (6.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/baseline-2.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/baseline-2.txt
new file mode 100644
index 0000000..582e903
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/baseline-2.txt
@@ -0,0 +1,47 @@
+memcap: <=7733 MiB (60% of 12889 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_write/text/1000
+Benchmarking mixed_write/text/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/text/1000: Collecting 100 samples in estimated 5.0058 s (34k iterations)
+Benchmarking mixed_write/text/1000: Analyzing
+mixed_write/text/1000   time:   [145.48 µs 146.06 µs 146.74 µs]
+                        thrpt:  [187.85 MiB/s 188.71 MiB/s 189.48 MiB/s]
+Found 12 outliers among 100 measurements (12.00%)
+  5 (5.00%) high mild
+  7 (7.00%) high severe
+Benchmarking mixed_write/scalar/1000
+Benchmarking mixed_write/scalar/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/scalar/1000: Collecting 100 samples in estimated 5.0056 s (53k iterations)
+Benchmarking mixed_write/scalar/1000: Analyzing
+mixed_write/scalar/1000 time:   [94.485 µs 95.239 µs 96.261 µs]
+                        thrpt:  [415.14 MiB/s 419.59 MiB/s 422.94 MiB/s]
+Found 8 outliers among 100 measurements (8.00%)
+  1 (1.00%) high mild
+  7 (7.00%) high severe
+Benchmarking mixed_write/enum/1000
+Benchmarking mixed_write/enum/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/enum/1000: Collecting 100 samples in estimated 5.0044 s (62k iterations)
+Benchmarking mixed_write/enum/1000: Analyzing
+mixed_write/enum/1000   time:   [79.147 µs 79.695 µs 80.396 µs]
+                        thrpt:  [237.40 MiB/s 239.49 MiB/s 241.15 MiB/s]
+Found 7 outliers among 100 measurements (7.00%)
+  7 (7.00%) high severe
+Benchmarking mixed_write/pattern/1000
+Benchmarking mixed_write/pattern/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/pattern/1000: Collecting 100 samples in estimated 5.0020 s (34k iterations)
+Benchmarking mixed_write/pattern/1000: Analyzing
+mixed_write/pattern/1000
+                        time:   [144.87 µs 146.45 µs 148.66 µs]
+                        thrpt:  [121.97 MiB/s 123.81 MiB/s 125.16 MiB/s]
+Found 15 outliers among 100 measurements (15.00%)
+  6 (6.00%) high mild
+  9 (9.00%) high severe
+Benchmarking mixed_write/nested/1000
+Benchmarking mixed_write/nested/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/nested/1000: Collecting 100 samples in estimated 5.0065 s (52k iterations)
+Benchmarking mixed_write/nested/1000: Analyzing
+mixed_write/nested/1000 time:   [97.471 µs 97.920 µs 98.417 µs]
+                        thrpt:  [367.29 MiB/s 369.15 MiB/s 370.85 MiB/s]
+Found 4 outliers among 100 measurements (4.00%)
+  2 (2.00%) high mild
+  2 (2.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/baseline-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/baseline-build.txt
new file mode 100644
index 0000000..87c34f5
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/baseline-build.txt
@@ -0,0 +1,3 @@
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+    Finished `bench` profile [optimized] target(s) in 2.78s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/baseline.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/baseline.lock
new file mode 100644
index 0000000..78a11b2
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/criterion-SHA256SUMS b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/criterion-SHA256SUMS
new file mode 100644
index 0000000..6e1b788
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/criterion-SHA256SUMS
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/criterion-results.tar.gz b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/criterion-results.tar.gz
new file mode 100644
index 0000000..9602b29
Binary files /dev/null and b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/criterion-results.tar.gz differ
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/current-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/current-0.txt
new file mode 100644
index 0000000..a384bad
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/current-0.txt
@@ -0,0 +1,48 @@
+memcap: <=7731 MiB (60% of 12886 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_write/text/1000
+Benchmarking mixed_write/text/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/text/1000: Collecting 100 samples in estimated 5.0122 s (35k iterations)
+Benchmarking mixed_write/text/1000: Analyzing
+mixed_write/text/1000   time:   [140.95 µs 141.72 µs 142.63 µs]
+                        thrpt:  [193.25 MiB/s 194.50 MiB/s 195.56 MiB/s]
+Found 10 outliers among 100 measurements (10.00%)
+  5 (5.00%) high mild
+  5 (5.00%) high severe
+Benchmarking mixed_write/scalar/1000
+Benchmarking mixed_write/scalar/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/scalar/1000: Collecting 100 samples in estimated 5.0085 s (52k iterations)
+Benchmarking mixed_write/scalar/1000: Analyzing
+mixed_write/scalar/1000 time:   [95.757 µs 96.564 µs 97.552 µs]
+                        thrpt:  [409.64 MiB/s 413.84 MiB/s 417.33 MiB/s]
+Found 9 outliers among 100 measurements (9.00%)
+  3 (3.00%) high mild
+  6 (6.00%) high severe
+Benchmarking mixed_write/enum/1000
+Benchmarking mixed_write/enum/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/enum/1000: Collecting 100 samples in estimated 5.0051 s (64k iterations)
+Benchmarking mixed_write/enum/1000: Analyzing
+mixed_write/enum/1000   time:   [78.286 µs 78.986 µs 79.860 µs]
+                        thrpt:  [238.99 MiB/s 241.64 MiB/s 243.80 MiB/s]
+Found 13 outliers among 100 measurements (13.00%)
+  3 (3.00%) high mild
+  10 (10.00%) high severe
+Benchmarking mixed_write/pattern/1000
+Benchmarking mixed_write/pattern/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/pattern/1000: Collecting 100 samples in estimated 5.0121 s (35k iterations)
+Benchmarking mixed_write/pattern/1000: Analyzing
+mixed_write/pattern/1000
+                        time:   [141.24 µs 141.93 µs 142.73 µs]
+                        thrpt:  [127.04 MiB/s 127.75 MiB/s 128.38 MiB/s]
+Found 15 outliers among 100 measurements (15.00%)
+  5 (5.00%) high mild
+  10 (10.00%) high severe
+Benchmarking mixed_write/nested/1000
+Benchmarking mixed_write/nested/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/nested/1000: Collecting 100 samples in estimated 5.0080 s (49k iterations)
+Benchmarking mixed_write/nested/1000: Analyzing
+mixed_write/nested/1000 time:   [99.251 µs 99.909 µs 100.72 µs]
+                        thrpt:  [358.89 MiB/s 361.80 MiB/s 364.20 MiB/s]
+Found 8 outliers among 100 measurements (8.00%)
+  2 (2.00%) high mild
+  6 (6.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/current-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/current-1.txt
new file mode 100644
index 0000000..dc45c13
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/current-1.txt
@@ -0,0 +1,48 @@
+memcap: <=7734 MiB (60% of 12890 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_write/text/1000
+Benchmarking mixed_write/text/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/text/1000: Collecting 100 samples in estimated 5.0024 s (35k iterations)
+Benchmarking mixed_write/text/1000: Analyzing
+mixed_write/text/1000   time:   [142.05 µs 142.67 µs 143.38 µs]
+                        thrpt:  [192.24 MiB/s 193.20 MiB/s 194.05 MiB/s]
+Found 9 outliers among 100 measurements (9.00%)
+  7 (7.00%) high mild
+  2 (2.00%) high severe
+Benchmarking mixed_write/scalar/1000
+Benchmarking mixed_write/scalar/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/scalar/1000: Collecting 100 samples in estimated 5.0061 s (53k iterations)
+Benchmarking mixed_write/scalar/1000: Analyzing
+mixed_write/scalar/1000 time:   [95.130 µs 95.547 µs 96.034 µs]
+                        thrpt:  [416.12 MiB/s 418.24 MiB/s 420.08 MiB/s]
+Found 14 outliers among 100 measurements (14.00%)
+  5 (5.00%) high mild
+  9 (9.00%) high severe
+Benchmarking mixed_write/enum/1000
+Benchmarking mixed_write/enum/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/enum/1000: Collecting 100 samples in estimated 5.0023 s (64k iterations)
+Benchmarking mixed_write/enum/1000: Analyzing
+mixed_write/enum/1000   time:   [77.567 µs 77.982 µs 78.454 µs]
+                        thrpt:  [243.28 MiB/s 244.75 MiB/s 246.06 MiB/s]
+Found 11 outliers among 100 measurements (11.00%)
+  5 (5.00%) high mild
+  6 (6.00%) high severe
+Benchmarking mixed_write/pattern/1000
+Benchmarking mixed_write/pattern/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/pattern/1000: Collecting 100 samples in estimated 5.0017 s (35k iterations)
+Benchmarking mixed_write/pattern/1000: Analyzing
+mixed_write/pattern/1000
+                        time:   [141.52 µs 143.12 µs 145.16 µs]
+                        thrpt:  [124.91 MiB/s 126.69 MiB/s 128.13 MiB/s]
+Found 11 outliers among 100 measurements (11.00%)
+  4 (4.00%) high mild
+  7 (7.00%) high severe
+Benchmarking mixed_write/nested/1000
+Benchmarking mixed_write/nested/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/nested/1000: Collecting 100 samples in estimated 5.0052 s (51k iterations)
+Benchmarking mixed_write/nested/1000: Analyzing
+mixed_write/nested/1000 time:   [97.713 µs 98.018 µs 98.446 µs]
+                        thrpt:  [367.18 MiB/s 368.78 MiB/s 369.93 MiB/s]
+Found 9 outliers among 100 measurements (9.00%)
+  8 (8.00%) high mild
+  1 (1.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/current-2.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/current-2.txt
new file mode 100644
index 0000000..d8f86c4
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/current-2.txt
@@ -0,0 +1,48 @@
+memcap: <=7732 MiB (60% of 12887 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_write/text/1000
+Benchmarking mixed_write/text/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/text/1000: Collecting 100 samples in estimated 5.0067 s (35k iterations)
+Benchmarking mixed_write/text/1000: Analyzing
+mixed_write/text/1000   time:   [142.71 µs 143.46 µs 144.30 µs]
+                        thrpt:  [191.02 MiB/s 192.14 MiB/s 193.14 MiB/s]
+Found 10 outliers among 100 measurements (10.00%)
+  5 (5.00%) high mild
+  5 (5.00%) high severe
+Benchmarking mixed_write/scalar/1000
+Benchmarking mixed_write/scalar/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/scalar/1000: Collecting 100 samples in estimated 5.0020 s (48k iterations)
+Benchmarking mixed_write/scalar/1000: Analyzing
+mixed_write/scalar/1000 time:   [104.49 µs 105.49 µs 107.00 µs]
+                        thrpt:  [373.48 MiB/s 378.80 MiB/s 382.43 MiB/s]
+Found 12 outliers among 100 measurements (12.00%)
+  5 (5.00%) high mild
+  7 (7.00%) high severe
+Benchmarking mixed_write/enum/1000
+Benchmarking mixed_write/enum/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/enum/1000: Collecting 100 samples in estimated 5.0060 s (64k iterations)
+Benchmarking mixed_write/enum/1000: Analyzing
+mixed_write/enum/1000   time:   [77.796 µs 78.304 µs 78.884 µs]
+                        thrpt:  [241.95 MiB/s 243.74 MiB/s 245.33 MiB/s]
+Found 12 outliers among 100 measurements (12.00%)
+  5 (5.00%) high mild
+  7 (7.00%) high severe
+Benchmarking mixed_write/pattern/1000
+Benchmarking mixed_write/pattern/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/pattern/1000: Collecting 100 samples in estimated 5.0095 s (31k iterations)
+Benchmarking mixed_write/pattern/1000: Analyzing
+mixed_write/pattern/1000
+                        time:   [159.93 µs 161.20 µs 162.96 µs]
+                        thrpt:  [111.27 MiB/s 112.48 MiB/s 113.38 MiB/s]
+Found 13 outliers among 100 measurements (13.00%)
+  4 (4.00%) high mild
+  9 (9.00%) high severe
+Benchmarking mixed_write/nested/1000
+Benchmarking mixed_write/nested/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/nested/1000: Collecting 100 samples in estimated 5.0041 s (50k iterations)
+Benchmarking mixed_write/nested/1000: Analyzing
+mixed_write/nested/1000 time:   [99.966 µs 100.85 µs 101.84 µs]
+                        thrpt:  [354.96 MiB/s 358.43 MiB/s 361.59 MiB/s]
+Found 18 outliers among 100 measurements (18.00%)
+  2 (2.00%) high mild
+  16 (16.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/current-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/current-build.txt
new file mode 100644
index 0000000..4a38e3c
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/current-build.txt
@@ -0,0 +1,3 @@
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+    Finished `bench` profile [optimized] target(s) in 2.83s
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/harness.rs b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/harness.rs
new file mode 100644
index 0000000..7d0413e
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/harness.rs
@@ -0,0 +1,120 @@
+use criterion::{
+    criterion_group, criterion_main, BenchmarkId, Criterion, SamplingMode, Throughput,
+};
+use polyxml::schema::ModelSchema;
+use polyxml::schema_parser::XsdParser;
+use polyxml::{deserialize, serialize, PolyValue};
+use std::{hint::black_box, sync::Arc};
+
+fn fixture(kind: &str, count: usize) -> (Arc<ModelSchema>, Vec<u8>) {
+    let xsd = r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
+      <xs:simpleType name="State"><xs:restriction base="xs:string"><xs:enumeration value="Ready"/><xs:enumeration value="Done"/></xs:restriction></xs:simpleType>
+      <xs:simpleType name="Code"><xs:restriction base="xs:string"><xs:pattern value="[A-Z]{3}[0-9]{3}"/></xs:restriction></xs:simpleType>
+      <xs:element name="Root"><xs:complexType mixed="true"><xs:choice minOccurs="0" maxOccurs="unbounded">
+        <xs:element name="Text" type="xs:string"/>
+        <xs:element name="Number" type="xs:int"/>
+        <xs:element name="State" type="State"/>
+        <xs:element name="Code" type="Code"/>
+        <xs:element name="Child"><xs:complexType><xs:sequence><xs:element name="Value" type="xs:string"/></xs:sequence></xs:complexType></xs:element>
+      </xs:choice></xs:complexType></xs:element>
+    </xs:schema>"#;
+    let ir = XsdParser::new().parse_str(xsd).unwrap();
+    let schema = ModelSchema::from_ir(&ir, Some("Root")).unwrap();
+    let mut xml = String::from("<Root>");
+    for index in 0..count {
+        let part = match kind {
+            "text" => format!("text-{index}&amp;<![CDATA[more]]>"),
+            "scalar" => format!("<Text>item-{index}&amp;<![CDATA[more]]></Text>"),
+            "enum" => "<State>Ready</State>".into(),
+            "pattern" => format!("<Code>ABC{:03}</Code>", index % 1000),
+            "nested" => format!("<Child><Value>item-{index}</Value></Child>"),
+            _ => unreachable!(),
+        };
+        xml.push_str(&part);
+    }
+    xml.push_str("</Root>");
+    let value = deserialize(xml.as_bytes(), Arc::clone(&schema)).unwrap();
+    let items_name = &schema.fields[schema.mixed_content.as_ref().unwrap().items_index].name;
+    let items = value.get(items_name).and_then(PolyValue::as_list).unwrap();
+    if kind == "text" {
+        // Text, GeneralRef and CData become separate ordered items.
+        assert_eq!(items.len(), count * 3);
+        for (index, items) in items.chunks_exact(3).enumerate() {
+            for (item, expected) in
+                items
+                    .iter()
+                    .zip([format!("text-{index}"), "&".into(), "more".into()])
+            {
+                assert_eq!(item.get("kind").and_then(PolyValue::as_str), Some("#text"));
+                assert_eq!(
+                    item.get("value").and_then(PolyValue::as_str),
+                    Some(expected.as_str())
+                );
+            }
+        }
+    } else {
+        assert_eq!(items.len(), count);
+        for (index, item) in items.iter().enumerate() {
+            let value = item.get("value").unwrap();
+            match kind {
+                "scalar" => assert_eq!(value.as_str(), Some(format!("item-{index}&more").as_str())),
+                "enum" => assert_eq!(value.as_str(), Some("Ready")),
+                "pattern" => assert_eq!(
+                    value.as_str(),
+                    Some(format!("ABC{:03}", index % 1000).as_str())
+                ),
+                "nested" => assert_eq!(
+                    value.get("value").and_then(PolyValue::as_str),
+                    Some(format!("item-{index}").as_str())
+                ),
+                _ => unreachable!(),
+            }
+        }
+    }
+    let output = serialize("Root", &value, &schema, None).unwrap();
+    let reparsed = deserialize(&output, Arc::clone(&schema)).unwrap();
+    if kind == "text" {
+        // XML writers coalesce adjacent text segments. Compare their text value
+        // rather than treating the reader's segmentation as XML semantics.
+        let text = |value: &PolyValue| -> String {
+            value
+                .get(items_name)
+                .unwrap()
+                .as_list()
+                .unwrap()
+                .iter()
+                .map(|item| item.get("value").unwrap().as_str().unwrap())
+                .collect()
+        };
+        assert_eq!(text(&value), text(&reparsed));
+    } else {
+        assert_eq!(value, reparsed);
+    }
+    (schema, xml.into_bytes())
+}
+
+fn benchmarks(c: &mut Criterion) {
+    for operation in ["mixed_read", "mixed_write"] {
+        let mut group = c.benchmark_group(operation);
+        group.sampling_mode(SamplingMode::Flat);
+        for kind in ["text", "scalar", "enum", "pattern", "nested"] {
+            let (schema, xml) = fixture(kind, 1000);
+            let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+            group.throughput(Throughput::Bytes(xml.len() as u64));
+            group.bench_function(BenchmarkId::new(kind, 1000), |b| {
+                if operation == "mixed_read" {
+                    b.iter(|| {
+                        black_box(deserialize(black_box(&xml), Arc::clone(&schema)).unwrap())
+                    });
+                } else {
+                    b.iter(|| {
+                        black_box(serialize("Root", black_box(&value), &schema, None).unwrap())
+                    });
+                }
+            });
+        }
+        group.finish();
+    }
+}
+criterion_group!(benches, benchmarks);
+criterion_main!(benches);
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/metadata.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/metadata.json
new file mode 100644
index 0000000..e0c0cca
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/metadata.json
@@ -0,0 +1,19 @@
+{
+  "revisions": {
+    "baseline": "1819c91b0808b9242c642d82350d2b657b60108c",
+    "current": "d3bf1728be1d265b6b5d317946492cec9b4a6f8c"
+  },
+  "core_status": {
+    "baseline": "",
+    "current": ""
+  },
+  "sample_size": 100,
+  "warmup_seconds": 3.0,
+  "measurement_seconds": 5.0,
+  "rounds": 3,
+  "filter": "^mixed_write/",
+  "order": "alternate baseline/current per round",
+  "os": "Linux-6.18.40.1-microsoft-standard-WSL2-x86_64-with-glibc2.43",
+  "cpu": "11th Gen Intel(R) Core(TM) i5-11600K @ 3.90GHz",
+  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)\nbinary: rustc\ncommit-hash: b940084d7eb6a299eb4bfeb8e34901bc051e7ac4\ncommit-date: 2026-09-28\nhost: x86_64-unknown-linux-gnu\nrelease: 1.99.0\nLLVM version: 23.1.1\n"
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/summary.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-common/summary.json
new file mode 100644
index 0000000..89b0c62
--- /dev/null
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/baseline-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/baseline-0.txt
new file mode 100644
index 0000000..92bb460
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/baseline-0.txt
@@ -0,0 +1,22 @@
+memcap: <=7643 MiB (60% of 12738 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_64/1000
+Benchmarking branch_write/branches_64/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/1000: Collecting 50 samples in estimated 2.0005 s (31k iterations)
+Benchmarking branch_write/branches_64/1000: Analyzing
+branch_write/branches_64/1000
+                        time:   [64.110 µs 64.537 µs 65.054 µs]
+                        thrpt:  [174.49 MiB/s 175.89 MiB/s 177.06 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  1 (2.00%) high mild
+  2 (4.00%) high severe
+Benchmarking branch_write/branches_256/1000
+Benchmarking branch_write/branches_256/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/1000: Collecting 50 samples in estimated 2.0005 s (31k iterations)
+Benchmarking branch_write/branches_256/1000: Analyzing
+branch_write/branches_256/1000
+                        time:   [64.177 µs 64.606 µs 65.095 µs]
+                        thrpt:  [174.38 MiB/s 175.71 MiB/s 176.88 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  1 (2.00%) high mild
+  6 (12.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/baseline-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/baseline-1.txt
new file mode 100644
index 0000000..593717c
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/baseline-1.txt
@@ -0,0 +1,22 @@
+memcap: <=7696 MiB (60% of 12826 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_64/1000
+Benchmarking branch_write/branches_64/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/1000: Collecting 50 samples in estimated 2.0009 s (31k iterations)
+Benchmarking branch_write/branches_64/1000: Analyzing
+branch_write/branches_64/1000
+                        time:   [63.666 µs 64.004 µs 64.445 µs]
+                        thrpt:  [176.14 MiB/s 177.36 MiB/s 178.30 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  1 (2.00%) high mild
+  2 (4.00%) high severe
+Benchmarking branch_write/branches_256/1000
+Benchmarking branch_write/branches_256/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/1000: Collecting 50 samples in estimated 2.0023 s (31k iterations)
+Benchmarking branch_write/branches_256/1000: Analyzing
+branch_write/branches_256/1000
+                        time:   [63.527 µs 64.478 µs 65.764 µs]
+                        thrpt:  [172.61 MiB/s 176.05 MiB/s 178.69 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  1 (2.00%) high mild
+  4 (8.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/baseline-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/baseline-build.txt
new file mode 100644
index 0000000..0c87797
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/baseline-build.txt
@@ -0,0 +1,3 @@
+memcap: <=7699 MiB (60% of 12833 MiB available) [systemd MemoryMax, swap off]
+   Compiling core-regression v0.0.0 (/home/bailey/github/polyxml-mixed-index/benchmarks/rust-xml-regression/target/core-baseline)
+    Finished `bench` profile [optimized] target(s) in 2.76s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/baseline.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/baseline.lock
new file mode 100644
index 0000000..78a11b2
--- /dev/null
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/criterion-SHA256SUMS b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/criterion-SHA256SUMS
new file mode 100644
index 0000000..5b94376
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/criterion-SHA256SUMS
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/criterion-results.tar.gz b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/criterion-results.tar.gz
new file mode 100644
index 0000000..e44baee
Binary files /dev/null and b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/criterion-results.tar.gz differ
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/current-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/current-0.txt
new file mode 100644
index 0000000..8646eeb
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/current-0.txt
@@ -0,0 +1,22 @@
+memcap: <=7667 MiB (60% of 12778 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_64/1000
+Benchmarking branch_write/branches_64/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/1000: Collecting 50 samples in estimated 2.0005 s (32k iterations)
+Benchmarking branch_write/branches_64/1000: Analyzing
+branch_write/branches_64/1000
+                        time:   [61.579 µs 61.833 µs 62.144 µs]
+                        thrpt:  [182.67 MiB/s 183.58 MiB/s 184.34 MiB/s]
+Found 2 outliers among 50 measurements (4.00%)
+  1 (2.00%) high mild
+  1 (2.00%) high severe
+Benchmarking branch_write/branches_256/1000
+Benchmarking branch_write/branches_256/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/1000: Collecting 50 samples in estimated 2.0024 s (32k iterations)
+Benchmarking branch_write/branches_256/1000: Analyzing
+branch_write/branches_256/1000
+                        time:   [62.265 µs 62.907 µs 63.658 µs]
+                        thrpt:  [178.32 MiB/s 180.45 MiB/s 182.31 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  2 (4.00%) high mild
+  5 (10.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/current-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/current-1.txt
new file mode 100644
index 0000000..7a10722
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/current-1.txt
@@ -0,0 +1,22 @@
+memcap: <=7689 MiB (60% of 12815 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_64/1000
+Benchmarking branch_write/branches_64/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/1000: Collecting 50 samples in estimated 2.0013 s (32k iterations)
+Benchmarking branch_write/branches_64/1000: Analyzing
+branch_write/branches_64/1000
+                        time:   [61.623 µs 61.994 µs 62.458 µs]
+                        thrpt:  [181.75 MiB/s 183.11 MiB/s 184.21 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  2 (4.00%) high mild
+  3 (6.00%) high severe
+Benchmarking branch_write/branches_256/1000
+Benchmarking branch_write/branches_256/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/1000: Collecting 50 samples in estimated 2.0020 s (32k iterations)
+Benchmarking branch_write/branches_256/1000: Analyzing
+branch_write/branches_256/1000
+                        time:   [62.498 µs 63.029 µs 63.661 µs]
+                        thrpt:  [178.31 MiB/s 180.10 MiB/s 181.63 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  1 (2.00%) high mild
+  6 (12.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/current-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/current-build.txt
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--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/current-build.txt
@@ -0,0 +1,3 @@
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+    Finished `bench` profile [optimized] target(s) in 2.73s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/current.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/current.lock
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/harness.rs b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/harness.rs
new file mode 100644
index 0000000..a268184
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/harness.rs
@@ -0,0 +1,77 @@
+use criterion::{
+    criterion_group, criterion_main, BenchmarkId, Criterion, SamplingMode, Throughput,
+};
+use polyxml::schema::ModelSchema;
+use polyxml::schema_parser::XsdParser;
+use polyxml::{deserialize, serialize, PolyValue};
+use std::{hint::black_box, sync::Arc};
+
+fn fixture(branches: usize, count: usize) -> (Arc<ModelSchema>, Vec<u8>) {
+    let declarations = (0..branches)
+        .map(|i| format!(r#"<xs:element name="B{i}" type="xs:int"/>"#))
+        .collect::<String>();
+    let xsd = format!(
+        r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"><xs:element name="Root"><xs:complexType mixed="true"><xs:choice minOccurs="0" maxOccurs="unbounded">{declarations}</xs:choice></xs:complexType></xs:element></xs:schema>"#
+    );
+    let ir = XsdParser::new().parse_str(&xsd).unwrap();
+    let schema = ModelSchema::from_ir(&ir, Some("Root")).unwrap();
+    let body = (0..count)
+        .map(|i| format!("<B{}>{i}</B{}>", i % 1, i % 1))
+        .collect::<String>();
+    let xml = format!("<Root>{body}</Root>").into_bytes();
+    let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+    let mixed = schema.mixed_content.as_ref().unwrap();
+    let field = &schema.fields[mixed.items_index].name;
+    let items = value.get(field).and_then(PolyValue::as_list).unwrap();
+    assert_eq!(items.len(), count);
+    for (i, item) in items.iter().enumerate() {
+        assert_eq!(item.get("value"), Some(&PolyValue::Int(i as i64)));
+        let kind = item.get("kind").and_then(PolyValue::as_str).unwrap();
+        let branch = mixed
+            .branches
+            .iter()
+            .find(|b| b.variant_name == kind)
+            .unwrap();
+        assert_eq!(branch.xml_name, format!("B{}", i % 1).as_bytes());
+    }
+    let output = serialize("Root", &value, &schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+    let output = serialize("Sensor", &value, &schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    (schema, xml)
+}
+
+fn benchmarks(c: &mut Criterion) {
+    for operation in ["branch_read", "branch_write"] {
+        let mut group = c.benchmark_group(operation);
+        group.sampling_mode(SamplingMode::Flat);
+        for branches in [64, 256] {
+            for count in [1000] {
+                let (schema, xml) = fixture(branches, count);
+                let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+                group.throughput(Throughput::Bytes(xml.len() as u64));
+                group.bench_with_input(
+                    BenchmarkId::new(format!("branches_{branches}"), count),
+                    &count,
+                    |b, _| {
+                        b.iter(|| {
+                            if operation == "branch_read" {
+                                black_box(
+                                    deserialize(black_box(&xml), Arc::clone(&schema)).unwrap(),
+                                );
+                            } else {
+                                black_box(
+                                    serialize("Root", black_box(&value), &schema, None).unwrap(),
+                                );
+                            }
+                        });
+                    },
+                );
+            }
+        }
+        group.finish();
+    }
+}
+criterion_group!(benches, benchmarks);
+criterion_main!(benches);
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/metadata.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/metadata.json
new file mode 100644
index 0000000..bb748c9
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/metadata.json
@@ -0,0 +1,19 @@
+{
+  "revisions": {
+    "baseline": "1819c91b0808b9242c642d82350d2b657b60108c",
+    "current": "58cb346f964b5196dfad62e8a62a8aa4beb9beef"
+  },
+  "core_status": {
+    "baseline": "",
+    "current": ""
+  },
+  "sample_size": 50,
+  "warmup_seconds": 1.0,
+  "measurement_seconds": 2.0,
+  "rounds": 2,
+  "filter": "^branch_write/",
+  "order": "alternate baseline/current per round",
+  "os": "Linux-6.18.40.1-microsoft-standard-WSL2-x86_64-with-glibc2.43",
+  "cpu": "11th Gen Intel(R) Core(TM) i5-11600K @ 3.90GHz",
+  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)\nbinary: rustc\ncommit-hash: b940084d7eb6a299eb4bfeb8e34901bc051e7ac4\ncommit-date: 2026-09-28\nhost: x86_64-unknown-linux-gnu\nrelease: 1.99.0\nLLVM version: 23.1.1\n"
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/summary.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/summary.json
new file mode 100644
index 0000000..0d0f5fc
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-final-sampled/summary.json
@@ -0,0 +1,106 @@
+{
+  "branch_write/branches_256/1000": {
+    "baseline_ns": 64541.83328119491,
+    "candidate_ns": 62968.14529938226,
+    "delta_percent": -2.438244936360001,
+    "speedup": 1.024991810928058,
+    "process_deltas_percent": [
+      -2.6292529525412944,
+      -2.246857986524997
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 64176.610931451614,
+            "upper_bound": 65095.36447741932
+          },
+          "point_estimate": 64605.79090322581,
+          "standard_error": 235.14445176437306
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 63527.48307234726,
+            "upper_bound": 65763.99403456593
+          },
+          "point_estimate": 64477.875659164005,
+          "standard_error": 582.357855271789
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 62264.5616749226,
+            "upper_bound": 63657.752735294096
+          },
+          "point_estimate": 62907.14123839009,
+          "standard_error": 358.6922526079523
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 62498.053372854905,
+            "upper_bound": 63661.3006575663
+          },
+          "point_estimate": 63029.149360374424,
+          "standard_error": 299.0012981933105
+        }
+      ]
+    }
+  },
+  "branch_write/branches_64/1000": {
+    "baseline_ns": 64270.401126666664,
+    "candidate_ns": 61913.7858676677,
+    "delta_percent": -3.666719388221107,
+    "speedup": 1.0380628518507318,
+    "process_deltas_percent": [
+      -4.189320376859773,
+      -3.139765604393052
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 64109.80960539215,
+            "upper_bound": 65054.48325571895
+          },
+          "point_estimate": 64536.94833333335,
+          "standard_error": 243.04414568335642
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 63666.41755040003,
+            "upper_bound": 64445.313326400006
+          },
+          "point_estimate": 64003.85391999998,
+          "standard_error": 200.0344031748133
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 61578.960038759695,
+            "upper_bound": 62143.64282713176
+          },
+          "point_estimate": 61833.28880620155,
+          "standard_error": 144.2415709695958
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 61623.31491496063,
+            "upper_bound": 62458.31786377951
+          },
+          "point_estimate": 61994.28292913385,
+          "standard_error": 215.4071323524662
+        }
+      ]
+    }
+  }
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-refined/baseline-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-refined/baseline-0.txt
new file mode 100644
index 0000000..dc53daa
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-refined/baseline-0.txt
@@ -0,0 +1,22 @@
+memcap: <=7651 MiB (60% of 12751 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_64/1000
+Benchmarking branch_write/branches_64/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/1000: Collecting 50 samples in estimated 2.0004 s (30k iterations)
+Benchmarking branch_write/branches_64/1000: Analyzing
+branch_write/branches_64/1000
+                        time:   [63.401 µs 63.740 µs 64.147 µs]
+                        thrpt:  [176.96 MiB/s 178.09 MiB/s 179.04 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  1 (2.00%) high mild
+  3 (6.00%) high severe
+Benchmarking branch_write/branches_256/1000
+Benchmarking branch_write/branches_256/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/1000: Collecting 50 samples in estimated 2.0002 s (31k iterations)
+Benchmarking branch_write/branches_256/1000: Analyzing
+branch_write/branches_256/1000
+                        time:   [63.828 µs 64.047 µs 64.290 µs]
+                        thrpt:  [176.57 MiB/s 177.24 MiB/s 177.85 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  4 (8.00%) high mild
+  1 (2.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-refined/baseline-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-refined/baseline-1.txt
new file mode 100644
index 0000000..1e6dae8
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-refined/baseline-1.txt
@@ -0,0 +1,22 @@
+memcap: <=7704 MiB (60% of 12841 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_64/1000
+Benchmarking branch_write/branches_64/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/1000: Collecting 50 samples in estimated 2.0032 s (31k iterations)
+Benchmarking branch_write/branches_64/1000: Analyzing
+branch_write/branches_64/1000
+                        time:   [64.195 µs 64.436 µs 64.738 µs]
+                        thrpt:  [175.35 MiB/s 176.17 MiB/s 176.83 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  1 (2.00%) high mild
+  3 (6.00%) high severe
+Benchmarking branch_write/branches_256/1000
+Benchmarking branch_write/branches_256/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/1000: Collecting 50 samples in estimated 2.0009 s (31k iterations)
+Benchmarking branch_write/branches_256/1000: Analyzing
+branch_write/branches_256/1000
+                        time:   [63.984 µs 64.268 µs 64.613 µs]
+                        thrpt:  [175.69 MiB/s 176.63 MiB/s 177.41 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  1 (2.00%) high mild
+  3 (6.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-refined/baseline-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-refined/baseline-build.txt
new file mode 100644
index 0000000..025af19
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-refined/baseline-build.txt
@@ -0,0 +1,3 @@
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+    Finished `bench` profile [optimized] target(s) in 2.73s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-refined/baseline.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-refined/baseline.lock
new file mode 100644
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-refined/criterion-results.tar.gz b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-refined/criterion-results.tar.gz
new file mode 100644
index 0000000..814978d
Binary files /dev/null and b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-refined/criterion-results.tar.gz differ
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-refined/current-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-refined/current-0.txt
new file mode 100644
index 0000000..fc0300a
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-refined/current-0.txt
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+memcap: <=7679 MiB (60% of 12798 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_64/1000
+Benchmarking branch_write/branches_64/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/1000: Collecting 50 samples in estimated 2.0031 s (28k iterations)
+Benchmarking branch_write/branches_64/1000: Analyzing
+branch_write/branches_64/1000
+                        time:   [70.109 µs 71.138 µs 72.594 µs]
+                        thrpt:  [156.37 MiB/s 159.57 MiB/s 161.91 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  4 (8.00%) high severe
+Benchmarking branch_write/branches_256/1000
+Benchmarking branch_write/branches_256/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/1000: Collecting 50 samples in estimated 2.0034 s (27k iterations)
+Benchmarking branch_write/branches_256/1000: Analyzing
+branch_write/branches_256/1000
+                        time:   [74.992 µs 76.411 µs 78.168 µs]
+                        thrpt:  [145.22 MiB/s 148.56 MiB/s 151.37 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  1 (2.00%) high mild
+  6 (12.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-refined/current-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-refined/current-1.txt
new file mode 100644
index 0000000..581901b
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-refined/current-1.txt
@@ -0,0 +1,22 @@
+memcap: <=7698 MiB (60% of 12830 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_64/1000
+Benchmarking branch_write/branches_64/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/1000: Collecting 50 samples in estimated 2.0002 s (28k iterations)
+Benchmarking branch_write/branches_64/1000: Analyzing
+branch_write/branches_64/1000
+                        time:   [70.993 µs 71.388 µs 71.938 µs]
+                        thrpt:  [157.80 MiB/s 159.01 MiB/s 159.90 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  2 (4.00%) high mild
+  1 (2.00%) high severe
+Benchmarking branch_write/branches_256/1000
+Benchmarking branch_write/branches_256/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/1000: Collecting 50 samples in estimated 2.0021 s (27k iterations)
+Benchmarking branch_write/branches_256/1000: Analyzing
+branch_write/branches_256/1000
+                        time:   [75.883 µs 77.411 µs 79.234 µs]
+                        thrpt:  [143.27 MiB/s 146.64 MiB/s 149.59 MiB/s]
+Found 8 outliers among 50 measurements (16.00%)
+  4 (8.00%) high mild
+  4 (8.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-refined/current-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-refined/current-build.txt
new file mode 100644
index 0000000..cb853c7
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-refined/current-build.txt
@@ -0,0 +1,3 @@
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+ "windows-sys",
+]
+
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+ "zerocopy-derive",
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+version = "0.8.59"
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+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.119",
+]
+
+[[package]]
+name = "zmij"
+version = "1.0.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-refined/harness.rs b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-refined/harness.rs
new file mode 100644
index 0000000..a268184
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-refined/harness.rs
@@ -0,0 +1,77 @@
+use criterion::{
+    criterion_group, criterion_main, BenchmarkId, Criterion, SamplingMode, Throughput,
+};
+use polyxml::schema::ModelSchema;
+use polyxml::schema_parser::XsdParser;
+use polyxml::{deserialize, serialize, PolyValue};
+use std::{hint::black_box, sync::Arc};
+
+fn fixture(branches: usize, count: usize) -> (Arc<ModelSchema>, Vec<u8>) {
+    let declarations = (0..branches)
+        .map(|i| format!(r#"<xs:element name="B{i}" type="xs:int"/>"#))
+        .collect::<String>();
+    let xsd = format!(
+        r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"><xs:element name="Root"><xs:complexType mixed="true"><xs:choice minOccurs="0" maxOccurs="unbounded">{declarations}</xs:choice></xs:complexType></xs:element></xs:schema>"#
+    );
+    let ir = XsdParser::new().parse_str(&xsd).unwrap();
+    let schema = ModelSchema::from_ir(&ir, Some("Root")).unwrap();
+    let body = (0..count)
+        .map(|i| format!("<B{}>{i}</B{}>", i % 1, i % 1))
+        .collect::<String>();
+    let xml = format!("<Root>{body}</Root>").into_bytes();
+    let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+    let mixed = schema.mixed_content.as_ref().unwrap();
+    let field = &schema.fields[mixed.items_index].name;
+    let items = value.get(field).and_then(PolyValue::as_list).unwrap();
+    assert_eq!(items.len(), count);
+    for (i, item) in items.iter().enumerate() {
+        assert_eq!(item.get("value"), Some(&PolyValue::Int(i as i64)));
+        let kind = item.get("kind").and_then(PolyValue::as_str).unwrap();
+        let branch = mixed
+            .branches
+            .iter()
+            .find(|b| b.variant_name == kind)
+            .unwrap();
+        assert_eq!(branch.xml_name, format!("B{}", i % 1).as_bytes());
+    }
+    let output = serialize("Root", &value, &schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+    let output = serialize("Sensor", &value, &schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    (schema, xml)
+}
+
+fn benchmarks(c: &mut Criterion) {
+    for operation in ["branch_read", "branch_write"] {
+        let mut group = c.benchmark_group(operation);
+        group.sampling_mode(SamplingMode::Flat);
+        for branches in [64, 256] {
+            for count in [1000] {
+                let (schema, xml) = fixture(branches, count);
+                let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+                group.throughput(Throughput::Bytes(xml.len() as u64));
+                group.bench_with_input(
+                    BenchmarkId::new(format!("branches_{branches}"), count),
+                    &count,
+                    |b, _| {
+                        b.iter(|| {
+                            if operation == "branch_read" {
+                                black_box(
+                                    deserialize(black_box(&xml), Arc::clone(&schema)).unwrap(),
+                                );
+                            } else {
+                                black_box(
+                                    serialize("Root", black_box(&value), &schema, None).unwrap(),
+                                );
+                            }
+                        });
+                    },
+                );
+            }
+        }
+        group.finish();
+    }
+}
+criterion_group!(benches, benchmarks);
+criterion_main!(benches);
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-refined/metadata.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-refined/metadata.json
new file mode 100644
index 0000000..26d8361
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-refined/metadata.json
@@ -0,0 +1,19 @@
+{
+  "revisions": {
+    "baseline": "1819c91b0808b9242c642d82350d2b657b60108c",
+    "current": "ba6fd98d252fd736d9ecc9a78c3f372b75f4b118"
+  },
+  "core_status": {
+    "baseline": "",
+    "current": ""
+  },
+  "sample_size": 50,
+  "warmup_seconds": 1.0,
+  "measurement_seconds": 2.0,
+  "rounds": 2,
+  "filter": "^branch_write/",
+  "order": "alternate baseline/current per round",
+  "os": "Linux-6.18.40.1-microsoft-standard-WSL2-x86_64-with-glibc2.43",
+  "cpu": "11th Gen Intel(R) Core(TM) i5-11600K @ 3.90GHz",
+  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)\nbinary: rustc\ncommit-hash: b940084d7eb6a299eb4bfeb8e34901bc051e7ac4\ncommit-date: 2026-09-28\nhost: x86_64-unknown-linux-gnu\nrelease: 1.99.0\nLLVM version: 23.1.1\n"
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-refined/summary.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-refined/summary.json
new file mode 100644
index 0000000..8836db3
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-refined/summary.json
@@ -0,0 +1,106 @@
+{
+  "branch_write/branches_256/1000": {
+    "baseline_ns": 64157.492062359626,
+    "candidate_ns": 76911.28659033397,
+    "delta_percent": 19.878885720124394,
+    "speedup": 0.8341752544602835,
+    "process_deltas_percent": [
+      19.305936757253363,
+      20.449856191065784
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 63828.30107717042,
+            "upper_bound": 64290.17956672025
+          },
+          "point_estimate": 64046.5270096463,
+          "standard_error": 117.45608606786014
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 63983.57186790923,
+            "upper_bound": 64612.50604538088
+          },
+          "point_estimate": 64268.457115072946,
+          "standard_error": 161.62704644839243
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 74992.27313271027,
+            "upper_bound": 78167.85962149531
+          },
+          "point_estimate": 76411.3090093458,
+          "standard_error": 820.6217972535823
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 75882.72660428303,
+            "upper_bound": 79233.86900931096
+          },
+          "point_estimate": 77411.26417132215,
+          "standard_error": 857.8977450927409
+        }
+      ]
+    }
+  },
+  "branch_write/branches_64/1000": {
+    "baseline_ns": 64088.08102521564,
+    "candidate_ns": 71262.94665098566,
+    "delta_percent": 11.19531980205033,
+    "speedup": 0.899318426153365,
+    "process_deltas_percent": [
+      11.607192487511252,
+      10.787898495600977
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 63400.78952961084,
+            "upper_bound": 64146.882143824034
+          },
+          "point_estimate": 63739.878375634544,
+          "standard_error": 191.12743851128332
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 64194.98190406503,
+            "upper_bound": 64738.43025040648
+          },
+          "point_estimate": 64436.28367479674,
+          "standard_error": 139.6706769964146
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 70108.99831875002,
+            "upper_bound": 72594.3854017857
+          },
+          "point_estimate": 71138.28875,
+          "standard_error": 647.322346596766
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 70993.47016935486,
+            "upper_bound": 71938.43634856632
+          },
+          "point_estimate": 71387.60455197131,
+          "standard_error": 246.92293743483856
+        }
+      ]
+    }
+  }
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/baseline-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/baseline-0.txt
new file mode 100644
index 0000000..0a20ed6
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/baseline-0.txt
@@ -0,0 +1,22 @@
+memcap: <=7642 MiB (60% of 12737 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_64/1000
+Benchmarking branch_write/branches_64/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/1000: Collecting 50 samples in estimated 2.0002 s (31k iterations)
+Benchmarking branch_write/branches_64/1000: Analyzing
+branch_write/branches_64/1000
+                        time:   [63.908 µs 64.501 µs 65.215 µs]
+                        thrpt:  [174.06 MiB/s 175.99 MiB/s 177.62 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  1 (2.00%) high mild
+  5 (10.00%) high severe
+Benchmarking branch_write/branches_256/1000
+Benchmarking branch_write/branches_256/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/1000: Collecting 50 samples in estimated 2.0016 s (31k iterations)
+Benchmarking branch_write/branches_256/1000: Analyzing
+branch_write/branches_256/1000
+                        time:   [64.554 µs 64.875 µs 65.301 µs]
+                        thrpt:  [173.83 MiB/s 174.98 MiB/s 175.85 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  1 (2.00%) high mild
+  2 (4.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/baseline-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/baseline-1.txt
new file mode 100644
index 0000000..752229a
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/baseline-1.txt
@@ -0,0 +1,22 @@
+memcap: <=7704 MiB (60% of 12840 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_64/1000
+Benchmarking branch_write/branches_64/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/1000: Collecting 50 samples in estimated 2.0005 s (31k iterations)
+Benchmarking branch_write/branches_64/1000: Analyzing
+branch_write/branches_64/1000
+                        time:   [63.127 µs 63.411 µs 63.739 µs]
+                        thrpt:  [178.09 MiB/s 179.02 MiB/s 179.82 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  2 (4.00%) high mild
+  5 (10.00%) high severe
+Benchmarking branch_write/branches_256/1000
+Benchmarking branch_write/branches_256/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/1000: Collecting 50 samples in estimated 2.0026 s (31k iterations)
+Benchmarking branch_write/branches_256/1000: Analyzing
+branch_write/branches_256/1000
+                        time:   [65.383 µs 67.039 µs 69.146 µs]
+                        thrpt:  [164.17 MiB/s 169.33 MiB/s 173.62 MiB/s]
+Found 9 outliers among 50 measurements (18.00%)
+  2 (4.00%) high mild
+  7 (14.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/baseline-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/baseline-build.txt
new file mode 100644
index 0000000..d9efff5
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/baseline-build.txt
@@ -0,0 +1,3 @@
+memcap: <=7684 MiB (60% of 12807 MiB available) [systemd MemoryMax, swap off]
+   Compiling core-regression v0.0.0 (/home/bailey/github/polyxml-mixed-index/benchmarks/rust-xml-regression/target/core-baseline)
+    Finished `bench` profile [optimized] target(s) in 2.77s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/baseline.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/baseline.lock
new file mode 100644
index 0000000..78a11b2
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/baseline.lock
@@ -0,0 +1,633 @@
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/criterion-SHA256SUMS b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/criterion-SHA256SUMS
new file mode 100644
index 0000000..47279cb
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/criterion-SHA256SUMS
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/criterion-results.tar.gz b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/criterion-results.tar.gz
new file mode 100644
index 0000000..81c7e97
Binary files /dev/null and b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/criterion-results.tar.gz differ
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/current-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/current-0.txt
new file mode 100644
index 0000000..c03ffc4
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/current-0.txt
@@ -0,0 +1,22 @@
+memcap: <=7690 MiB (60% of 12817 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_64/1000
+Benchmarking branch_write/branches_64/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/1000: Collecting 50 samples in estimated 2.0003 s (33k iterations)
+Benchmarking branch_write/branches_64/1000: Analyzing
+branch_write/branches_64/1000
+                        time:   [60.232 µs 61.261 µs 62.606 µs]
+                        thrpt:  [181.32 MiB/s 185.30 MiB/s 188.46 MiB/s]
+Found 8 outliers among 50 measurements (16.00%)
+  4 (8.00%) high mild
+  4 (8.00%) high severe
+Benchmarking branch_write/branches_256/1000
+Benchmarking branch_write/branches_256/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/1000: Collecting 50 samples in estimated 2.0010 s (33k iterations)
+Benchmarking branch_write/branches_256/1000: Analyzing
+branch_write/branches_256/1000
+                        time:   [61.061 µs 61.969 µs 63.030 µs]
+                        thrpt:  [180.10 MiB/s 183.18 MiB/s 185.90 MiB/s]
+Found 10 outliers among 50 measurements (20.00%)
+  3 (6.00%) high mild
+  7 (14.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/current-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/current-1.txt
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index 0000000..4de32a5
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/current-1.txt
@@ -0,0 +1,20 @@
+memcap: <=7700 MiB (60% of 12833 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_64/1000
+Benchmarking branch_write/branches_64/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/1000: Collecting 50 samples in estimated 2.0017 s (33k iterations)
+Benchmarking branch_write/branches_64/1000: Analyzing
+branch_write/branches_64/1000
+                        time:   [59.562 µs 59.763 µs 59.992 µs]
+                        thrpt:  [189.22 MiB/s 189.94 MiB/s 190.58 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  3 (6.00%) high mild
+Benchmarking branch_write/branches_256/1000
+Benchmarking branch_write/branches_256/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/1000: Collecting 50 samples in estimated 2.0017 s (33k iterations)
+Benchmarking branch_write/branches_256/1000: Analyzing
+branch_write/branches_256/1000
+                        time:   [59.703 µs 60.128 µs 60.654 µs]
+                        thrpt:  [187.15 MiB/s 188.79 MiB/s 190.14 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  3 (6.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/current-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/current-build.txt
new file mode 100644
index 0000000..68ac613
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/current-build.txt
@@ -0,0 +1,4 @@
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+   Compiling core-regression v0.0.0 (/home/bailey/github/polyxml-mixed-index/benchmarks/rust-xml-regression/target/core-current)
+    Finished `bench` profile [optimized] target(s) in 26.77s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/current.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/current.lock
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/harness.rs b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/harness.rs
new file mode 100644
index 0000000..a268184
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/harness.rs
@@ -0,0 +1,77 @@
+use criterion::{
+    criterion_group, criterion_main, BenchmarkId, Criterion, SamplingMode, Throughput,
+};
+use polyxml::schema::ModelSchema;
+use polyxml::schema_parser::XsdParser;
+use polyxml::{deserialize, serialize, PolyValue};
+use std::{hint::black_box, sync::Arc};
+
+fn fixture(branches: usize, count: usize) -> (Arc<ModelSchema>, Vec<u8>) {
+    let declarations = (0..branches)
+        .map(|i| format!(r#"<xs:element name="B{i}" type="xs:int"/>"#))
+        .collect::<String>();
+    let xsd = format!(
+        r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"><xs:element name="Root"><xs:complexType mixed="true"><xs:choice minOccurs="0" maxOccurs="unbounded">{declarations}</xs:choice></xs:complexType></xs:element></xs:schema>"#
+    );
+    let ir = XsdParser::new().parse_str(&xsd).unwrap();
+    let schema = ModelSchema::from_ir(&ir, Some("Root")).unwrap();
+    let body = (0..count)
+        .map(|i| format!("<B{}>{i}</B{}>", i % 1, i % 1))
+        .collect::<String>();
+    let xml = format!("<Root>{body}</Root>").into_bytes();
+    let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+    let mixed = schema.mixed_content.as_ref().unwrap();
+    let field = &schema.fields[mixed.items_index].name;
+    let items = value.get(field).and_then(PolyValue::as_list).unwrap();
+    assert_eq!(items.len(), count);
+    for (i, item) in items.iter().enumerate() {
+        assert_eq!(item.get("value"), Some(&PolyValue::Int(i as i64)));
+        let kind = item.get("kind").and_then(PolyValue::as_str).unwrap();
+        let branch = mixed
+            .branches
+            .iter()
+            .find(|b| b.variant_name == kind)
+            .unwrap();
+        assert_eq!(branch.xml_name, format!("B{}", i % 1).as_bytes());
+    }
+    let output = serialize("Root", &value, &schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+    let output = serialize("Sensor", &value, &schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    (schema, xml)
+}
+
+fn benchmarks(c: &mut Criterion) {
+    for operation in ["branch_read", "branch_write"] {
+        let mut group = c.benchmark_group(operation);
+        group.sampling_mode(SamplingMode::Flat);
+        for branches in [64, 256] {
+            for count in [1000] {
+                let (schema, xml) = fixture(branches, count);
+                let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+                group.throughput(Throughput::Bytes(xml.len() as u64));
+                group.bench_with_input(
+                    BenchmarkId::new(format!("branches_{branches}"), count),
+                    &count,
+                    |b, _| {
+                        b.iter(|| {
+                            if operation == "branch_read" {
+                                black_box(
+                                    deserialize(black_box(&xml), Arc::clone(&schema)).unwrap(),
+                                );
+                            } else {
+                                black_box(
+                                    serialize("Root", black_box(&value), &schema, None).unwrap(),
+                                );
+                            }
+                        });
+                    },
+                );
+            }
+        }
+        group.finish();
+    }
+}
+criterion_group!(benches, benchmarks);
+criterion_main!(benches);
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/metadata.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/metadata.json
new file mode 100644
index 0000000..e5a0519
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/metadata.json
@@ -0,0 +1,19 @@
+{
+  "revisions": {
+    "baseline": "1819c91b0808b9242c642d82350d2b657b60108c",
+    "current": "081683a9c4cdc9fded04e8e5d195ba74659c4a24"
+  },
+  "core_status": {
+    "baseline": "",
+    "current": ""
+  },
+  "sample_size": 50,
+  "warmup_seconds": 1.0,
+  "measurement_seconds": 2.0,
+  "rounds": 2,
+  "filter": "^branch_write/",
+  "order": "alternate baseline/current per round",
+  "os": "Linux-6.18.40.1-microsoft-standard-WSL2-x86_64-with-glibc2.43",
+  "cpu": "11th Gen Intel(R) Core(TM) i5-11600K @ 3.90GHz",
+  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)\nbinary: rustc\ncommit-hash: b940084d7eb6a299eb4bfeb8e34901bc051e7ac4\ncommit-date: 2026-09-28\nhost: x86_64-unknown-linux-gnu\nrelease: 1.99.0\nLLVM version: 23.1.1\n"
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/summary.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/summary.json
new file mode 100644
index 0000000..e800537
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-concentrated-sampled/summary.json
@@ -0,0 +1,106 @@
+{
+  "branch_write/branches_256/1000": {
+    "baseline_ns": 65957.08189508638,
+    "candidate_ns": 61048.1895836395,
+    "delta_percent": -7.442555325984756,
+    "speedup": 1.0804101210032022,
+    "process_deltas_percent": [
+      -4.479703733167073,
+      -10.309750270639128
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 64553.60503333334,
+            "upper_bound": 65301.12586585367
+          },
+          "point_estimate": 64874.88926829269,
+          "standard_error": 193.50625735478167
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 65383.13400729334,
+            "upper_bound": 69145.6320680713
+          },
+          "point_estimate": 67039.27452188006,
+          "standard_error": 969.9943474839505
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 61061.48368376723,
+            "upper_bound": 63029.83513476263
+          },
+          "point_estimate": 61968.68643185298,
+          "standard_error": 505.3669389500557
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 59702.65984454411,
+            "upper_bound": 60653.96641330345
+          },
+          "point_estimate": 60127.69273542602,
+          "standard_error": 245.36509966010314
+        }
+      ]
+    }
+  },
+  "branch_write/branches_64/1000": {
+    "baseline_ns": 63955.79468528204,
+    "candidate_ns": 60512.22260736197,
+    "delta_percent": -5.384300351305827,
+    "speedup": 1.0569070500064746,
+    "process_deltas_percent": [
+      -5.0221084659686,
+      -5.7527151613046
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 63907.61722355769,
+            "upper_bound": 65215.06566506409
+          },
+          "point_estimate": 64500.53660256408,
+          "standard_error": 335.37906986831234
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 63127.40642719999,
+            "upper_bound": 63739.139611199964
+          },
+          "point_estimate": 63411.052767999994,
+          "standard_error": 156.99901807177952
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 60231.87865797546,
+            "upper_bound": 62605.522414110404
+          },
+          "point_estimate": 61261.249693251535,
+          "standard_error": 611.3554051081031
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 59562.40175230063,
+            "upper_bound": 59991.60796932517
+          },
+          "point_estimate": 59763.1955214724,
+          "standard_error": 110.13203910385523
+        }
+      ]
+    }
+  }
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/baseline-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/baseline-0.txt
new file mode 100644
index 0000000..8a61f59
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/baseline-0.txt
@@ -0,0 +1,122 @@
+memcap: <=7623 MiB (60% of 12706 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_read/branches_1/1
+Benchmarking branch_read/branches_1/1: Warming up for 1.0000 s
+Benchmarking branch_read/branches_1/1: Collecting 50 samples in estimated 2.0000 s (3.2M iterations)
+Benchmarking branch_read/branches_1/1: Analyzing
+branch_read/branches_1/1
+                        time:   [624.38 ns 627.80 ns 632.24 ns]
+                        thrpt:  [34.693 MiB/s 34.939 MiB/s 35.130 MiB/s]
+Found 8 outliers among 50 measurements (16.00%)
+  5 (10.00%) high mild
+  3 (6.00%) high severe
+Benchmarking branch_read/branches_1/1000
+Benchmarking branch_read/branches_1/1000: Warming up for 1.0000 s
+Benchmarking branch_read/branches_1/1000: Collecting 50 samples in estimated 2.0069 s (6850 iterations)
+Benchmarking branch_read/branches_1/1000: Analyzing
+branch_read/branches_1/1000
+                        time:   [289.65 µs 294.33 µs 300.31 µs]
+                        thrpt:  [37.799 MiB/s 38.568 MiB/s 39.191 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  2 (4.00%) high mild
+  5 (10.00%) high severe
+Benchmarking branch_read/branches_16/1
+Benchmarking branch_read/branches_16/1: Warming up for 1.0000 s
+Benchmarking branch_read/branches_16/1: Collecting 50 samples in estimated 2.0000 s (3.1M iterations)
+Benchmarking branch_read/branches_16/1: Analyzing
+branch_read/branches_16/1
+                        time:   [649.36 ns 668.09 ns 700.95 ns]
+                        thrpt:  [31.293 MiB/s 32.832 MiB/s 33.779 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  1 (2.00%) high mild
+  3 (6.00%) high severe
+Benchmarking branch_read/branches_16/1000
+Benchmarking branch_read/branches_16/1000: Warming up for 1.0000 s
+Benchmarking branch_read/branches_16/1000: Collecting 50 samples in estimated 2.0035 s (6450 iterations)
+Benchmarking branch_read/branches_16/1000: Analyzing
+branch_read/branches_16/1000
+                        time:   [312.05 µs 314.25 µs 316.86 µs]
+                        thrpt:  [38.065 MiB/s 38.380 MiB/s 38.652 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  3 (6.00%) high mild
+  3 (6.00%) high severe
+Benchmarking branch_read/branches_64/1
+Benchmarking branch_read/branches_64/1: Warming up for 1.0000 s
+Benchmarking branch_read/branches_64/1: Collecting 50 samples in estimated 2.0000 s (3.1M iterations)
+Benchmarking branch_read/branches_64/1: Analyzing
+branch_read/branches_64/1
+                        time:   [644.24 ns 648.00 ns 652.91 ns]
+                        thrpt:  [33.595 MiB/s 33.850 MiB/s 34.047 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  2 (4.00%) high mild
+  2 (4.00%) high severe
+Benchmarking branch_read/branches_64/1000
+Benchmarking branch_read/branches_64/1000: Warming up for 1.0000 s
+Benchmarking branch_read/branches_64/1000: Collecting 50 samples in estimated 2.0126 s (5850 iterations)
+Benchmarking branch_read/branches_64/1000: Analyzing
+branch_read/branches_64/1000
+                        time:   [343.14 µs 345.46 µs 348.18 µs]
+                        thrpt:  [37.205 MiB/s 37.497 MiB/s 37.751 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  2 (4.00%) high mild
+  3 (6.00%) high severe
+Benchmarking branch_read/branches_256/1
+Benchmarking branch_read/branches_256/1: Warming up for 1.0000 s
+Benchmarking branch_read/branches_256/1: Collecting 50 samples in estimated 2.0000 s (3.1M iterations)
+Benchmarking branch_read/branches_256/1: Analyzing
+branch_read/branches_256/1
+                        time:   [643.23 ns 647.48 ns 653.83 ns]
+                        thrpt:  [33.548 MiB/s 33.877 MiB/s 34.100 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  4 (8.00%) high mild
+  1 (2.00%) high severe
+Benchmarking branch_read/branches_256/1000
+Benchmarking branch_read/branches_256/1000: Warming up for 1.0000 s
+Benchmarking branch_read/branches_256/1000: Collecting 50 samples in estimated 2.0141 s (4850 iterations)
+Benchmarking branch_read/branches_256/1000: Analyzing
+branch_read/branches_256/1000
+                        time:   [413.64 µs 415.96 µs 419.09 µs]
+                        thrpt:  [34.186 MiB/s 34.443 MiB/s 34.637 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  3 (6.00%) high mild
+  2 (4.00%) high severe
+
+Benchmarking branch_write/branches_1/1
+Benchmarking branch_write/branches_1/1: Warming up for 1.0000 s
+Benchmarking branch_write/branches_1/1: Collecting 50 samples in estimated 2.0000 s (17M iterations)
+Benchmarking branch_write/branches_1/1: Analyzing
+branch_write/branches_1/1
+                        time:   [115.15 ns 115.86 ns 116.77 ns]
+                        thrpt:  [187.84 MiB/s 189.32 MiB/s 190.49 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  1 (2.00%) high mild
+  2 (4.00%) high severe
+Benchmarking branch_write/branches_16/1
+Benchmarking branch_write/branches_16/1: Warming up for 1.0000 s
+Benchmarking branch_write/branches_16/1: Collecting 50 samples in estimated 2.0000 s (16M iterations)
+Benchmarking branch_write/branches_16/1: Analyzing
+branch_write/branches_16/1
+                        time:   [127.44 ns 127.95 ns 128.58 ns]
+                        thrpt:  [170.59 MiB/s 171.43 MiB/s 172.11 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  1 (2.00%) high mild
+  3 (6.00%) high severe
+Benchmarking branch_write/branches_64/1
+Benchmarking branch_write/branches_64/1: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/1: Collecting 50 samples in estimated 2.0000 s (13M iterations)
+Benchmarking branch_write/branches_64/1: Analyzing
+branch_write/branches_64/1
+                        time:   [145.86 ns 146.51 ns 147.27 ns]
+                        thrpt:  [148.94 MiB/s 149.71 MiB/s 150.38 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  1 (2.00%) high mild
+  2 (4.00%) high severe
+Benchmarking branch_write/branches_256/1
+Benchmarking branch_write/branches_256/1: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/1: Collecting 50 samples in estimated 2.0000 s (9.3M iterations)
+Benchmarking branch_write/branches_256/1: Analyzing
+branch_write/branches_256/1
+                        time:   [210.39 ns 214.12 ns 219.81 ns]
+                        thrpt:  [99.789 MiB/s 102.44 MiB/s 104.26 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  3 (6.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/baseline-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/baseline-1.txt
new file mode 100644
index 0000000..ddd85de
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/baseline-1.txt
@@ -0,0 +1,123 @@
+memcap: <=7699 MiB (60% of 12832 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_read/branches_1/1
+Benchmarking branch_read/branches_1/1: Warming up for 1.0000 s
+Benchmarking branch_read/branches_1/1: Collecting 50 samples in estimated 2.0000 s (3.1M iterations)
+Benchmarking branch_read/branches_1/1: Analyzing
+branch_read/branches_1/1
+                        time:   [630.92 ns 634.46 ns 639.00 ns]
+                        thrpt:  [34.326 MiB/s 34.572 MiB/s 34.766 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  1 (2.00%) high mild
+  3 (6.00%) high severe
+Benchmarking branch_read/branches_1/1000
+Benchmarking branch_read/branches_1/1000: Warming up for 1.0000 s
+Benchmarking branch_read/branches_1/1000: Collecting 50 samples in estimated 2.0024 s (6800 iterations)
+Benchmarking branch_read/branches_1/1000: Analyzing
+branch_read/branches_1/1000
+                        time:   [289.69 µs 293.39 µs 298.52 µs]
+                        thrpt:  [38.026 MiB/s 38.692 MiB/s 39.186 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  2 (4.00%) high mild
+  4 (8.00%) high severe
+Benchmarking branch_read/branches_16/1
+Benchmarking branch_read/branches_16/1: Warming up for 1.0000 s
+Benchmarking branch_read/branches_16/1: Collecting 50 samples in estimated 2.0000 s (3.0M iterations)
+Benchmarking branch_read/branches_16/1: Analyzing
+branch_read/branches_16/1
+                        time:   [658.09 ns 664.50 ns 672.47 ns]
+                        thrpt:  [32.618 MiB/s 33.009 MiB/s 33.331 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  2 (4.00%) high mild
+  4 (8.00%) high severe
+Benchmarking branch_read/branches_16/1000
+Benchmarking branch_read/branches_16/1000: Warming up for 1.0000 s
+Benchmarking branch_read/branches_16/1000: Collecting 50 samples in estimated 2.0102 s (6400 iterations)
+Benchmarking branch_read/branches_16/1000: Analyzing
+branch_read/branches_16/1000
+                        time:   [310.27 µs 311.82 µs 313.73 µs]
+                        thrpt:  [38.444 MiB/s 38.680 MiB/s 38.873 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  2 (4.00%) high mild
+  3 (6.00%) high severe
+Benchmarking branch_read/branches_64/1
+Benchmarking branch_read/branches_64/1: Warming up for 1.0000 s
+Benchmarking branch_read/branches_64/1: Collecting 50 samples in estimated 2.0000 s (3.1M iterations)
+Benchmarking branch_read/branches_64/1: Analyzing
+branch_read/branches_64/1
+                        time:   [650.69 ns 657.04 ns 665.00 ns]
+                        thrpt:  [32.984 MiB/s 33.384 MiB/s 33.710 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  1 (2.00%) high mild
+  4 (8.00%) high severe
+Benchmarking branch_read/branches_64/1000
+Benchmarking branch_read/branches_64/1000: Warming up for 1.0000 s
+Benchmarking branch_read/branches_64/1000: Collecting 50 samples in estimated 2.0108 s (5850 iterations)
+Benchmarking branch_read/branches_64/1000: Analyzing
+branch_read/branches_64/1000
+                        time:   [345.80 µs 350.53 µs 356.14 µs]
+                        thrpt:  [36.372 MiB/s 36.954 MiB/s 37.460 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  2 (4.00%) high mild
+  3 (6.00%) high severe
+Benchmarking branch_read/branches_256/1
+Benchmarking branch_read/branches_256/1: Warming up for 1.0000 s
+Benchmarking branch_read/branches_256/1: Collecting 50 samples in estimated 2.0000 s (3.0M iterations)
+Benchmarking branch_read/branches_256/1: Analyzing
+branch_read/branches_256/1
+                        time:   [657.79 ns 660.90 ns 665.46 ns]
+                        thrpt:  [32.961 MiB/s 33.189 MiB/s 33.346 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  2 (4.00%) high mild
+  2 (4.00%) high severe
+Benchmarking branch_read/branches_256/1000
+Benchmarking branch_read/branches_256/1000: Warming up for 1.0000 s
+Benchmarking branch_read/branches_256/1000: Collecting 50 samples in estimated 2.0136 s (4750 iterations)
+Benchmarking branch_read/branches_256/1000: Analyzing
+branch_read/branches_256/1000
+                        time:   [413.38 µs 415.22 µs 417.66 µs]
+                        thrpt:  [34.303 MiB/s 34.505 MiB/s 34.658 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  3 (6.00%) high mild
+  2 (4.00%) high severe
+
+Benchmarking branch_write/branches_1/1
+Benchmarking branch_write/branches_1/1: Warming up for 1.0000 s
+Benchmarking branch_write/branches_1/1: Collecting 50 samples in estimated 2.0000 s (17M iterations)
+Benchmarking branch_write/branches_1/1: Analyzing
+branch_write/branches_1/1
+                        time:   [115.48 ns 116.56 ns 117.88 ns]
+                        thrpt:  [186.07 MiB/s 188.18 MiB/s 189.94 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  2 (4.00%) high mild
+  4 (8.00%) high severe
+Benchmarking branch_write/branches_16/1
+Benchmarking branch_write/branches_16/1: Warming up for 1.0000 s
+Benchmarking branch_write/branches_16/1: Collecting 50 samples in estimated 2.0000 s (15M iterations)
+Benchmarking branch_write/branches_16/1: Analyzing
+branch_write/branches_16/1
+                        time:   [128.46 ns 129.99 ns 132.71 ns]
+                        thrpt:  [165.28 MiB/s 168.75 MiB/s 170.75 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  1 (2.00%) high mild
+  2 (4.00%) high severe
+Benchmarking branch_write/branches_64/1
+Benchmarking branch_write/branches_64/1: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/1: Collecting 50 samples in estimated 2.0000 s (14M iterations)
+Benchmarking branch_write/branches_64/1: Analyzing
+branch_write/branches_64/1
+                        time:   [144.29 ns 145.80 ns 147.89 ns]
+                        thrpt:  [148.31 MiB/s 150.44 MiB/s 152.02 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  2 (4.00%) high mild
+  4 (8.00%) high severe
+Benchmarking branch_write/branches_256/1
+Benchmarking branch_write/branches_256/1: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/1: Collecting 50 samples in estimated 2.0000 s (9.2M iterations)
+Benchmarking branch_write/branches_256/1: Analyzing
+branch_write/branches_256/1
+                        time:   [210.76 ns 212.21 ns 214.06 ns]
+                        thrpt:  [102.47 MiB/s 103.36 MiB/s 104.07 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  1 (2.00%) high mild
+  6 (12.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/baseline-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/baseline-build.txt
new file mode 100644
index 0000000..12e99a2
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/baseline-build.txt
@@ -0,0 +1,3 @@
+memcap: <=7700 MiB (60% of 12834 MiB available) [systemd MemoryMax, swap off]
+   Compiling core-regression v0.0.0 (/home/bailey/github/polyxml-mixed-index/benchmarks/rust-xml-regression/target/core-baseline)
+    Finished `bench` profile [optimized] target(s) in 2.74s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/baseline.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/baseline.lock
new file mode 100644
index 0000000..78a11b2
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/baseline.lock
@@ -0,0 +1,633 @@
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/criterion-SHA256SUMS b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/criterion-SHA256SUMS
new file mode 100644
index 0000000..732dbdd
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/criterion-SHA256SUMS
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/criterion-results.tar.gz b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/criterion-results.tar.gz
new file mode 100644
index 0000000..1613927
Binary files /dev/null and b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/criterion-results.tar.gz differ
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/current-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/current-0.txt
new file mode 100644
index 0000000..a83280e
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/current-0.txt
@@ -0,0 +1,119 @@
+memcap: <=7695 MiB (60% of 12826 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_read/branches_1/1
+Benchmarking branch_read/branches_1/1: Warming up for 1.0000 s
+Benchmarking branch_read/branches_1/1: Collecting 50 samples in estimated 2.0000 s (3.2M iterations)
+Benchmarking branch_read/branches_1/1: Analyzing
+branch_read/branches_1/1
+                        time:   [627.68 ns 633.86 ns 641.33 ns]
+                        thrpt:  [34.202 MiB/s 34.604 MiB/s 34.945 MiB/s]
+Found 8 outliers among 50 measurements (16.00%)
+  8 (16.00%) high severe
+Benchmarking branch_read/branches_1/1000
+Benchmarking branch_read/branches_1/1000: Warming up for 1.0000 s
+Benchmarking branch_read/branches_1/1000: Collecting 50 samples in estimated 2.0023 s (6900 iterations)
+Benchmarking branch_read/branches_1/1000: Analyzing
+branch_read/branches_1/1000
+                        time:   [287.42 µs 289.15 µs 291.53 µs]
+                        thrpt:  [38.938 MiB/s 39.258 MiB/s 39.495 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  1 (2.00%) high mild
+  2 (4.00%) high severe
+Benchmarking branch_read/branches_16/1
+Benchmarking branch_read/branches_16/1: Warming up for 1.0000 s
+Benchmarking branch_read/branches_16/1: Collecting 50 samples in estimated 2.0000 s (3.0M iterations)
+Benchmarking branch_read/branches_16/1: Analyzing
+branch_read/branches_16/1
+                        time:   [650.56 ns 654.41 ns 659.19 ns]
+                        thrpt:  [33.275 MiB/s 33.518 MiB/s 33.716 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  1 (2.00%) high mild
+  2 (4.00%) high severe
+Benchmarking branch_read/branches_16/1000
+Benchmarking branch_read/branches_16/1000: Warming up for 1.0000 s
+Benchmarking branch_read/branches_16/1000: Collecting 50 samples in estimated 2.0099 s (6500 iterations)
+Benchmarking branch_read/branches_16/1000: Analyzing
+branch_read/branches_16/1000
+                        time:   [309.03 µs 310.53 µs 312.41 µs]
+                        thrpt:  [38.606 MiB/s 38.840 MiB/s 39.029 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  3 (6.00%) high mild
+  2 (4.00%) high severe
+Benchmarking branch_read/branches_64/1
+Benchmarking branch_read/branches_64/1: Warming up for 1.0000 s
+Benchmarking branch_read/branches_64/1: Collecting 50 samples in estimated 2.0000 s (3.0M iterations)
+Benchmarking branch_read/branches_64/1: Analyzing
+branch_read/branches_64/1
+                        time:   [655.43 ns 665.43 ns 679.28 ns]
+                        thrpt:  [32.291 MiB/s 32.963 MiB/s 33.466 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  6 (12.00%) high severe
+Benchmarking branch_read/branches_64/1000
+Benchmarking branch_read/branches_64/1000: Warming up for 1.0000 s
+Benchmarking branch_read/branches_64/1000: Collecting 50 samples in estimated 2.0050 s (5750 iterations)
+Benchmarking branch_read/branches_64/1000: Analyzing
+branch_read/branches_64/1000
+                        time:   [341.88 µs 347.67 µs 356.49 µs]
+                        thrpt:  [36.337 MiB/s 37.259 MiB/s 37.890 MiB/s]
+Found 8 outliers among 50 measurements (16.00%)
+  5 (10.00%) high mild
+  3 (6.00%) high severe
+Benchmarking branch_read/branches_256/1
+Benchmarking branch_read/branches_256/1: Warming up for 1.0000 s
+Benchmarking branch_read/branches_256/1: Collecting 50 samples in estimated 2.0000 s (3.1M iterations)
+Benchmarking branch_read/branches_256/1: Analyzing
+branch_read/branches_256/1
+                        time:   [648.77 ns 655.08 ns 663.38 ns]
+                        thrpt:  [33.065 MiB/s 33.484 MiB/s 33.809 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  6 (12.00%) high severe
+Benchmarking branch_read/branches_256/1000
+Benchmarking branch_read/branches_256/1000: Warming up for 1.0000 s
+Benchmarking branch_read/branches_256/1000: Collecting 50 samples in estimated 2.0183 s (4900 iterations)
+Benchmarking branch_read/branches_256/1000: Analyzing
+branch_read/branches_256/1000
+                        time:   [409.19 µs 410.70 µs 412.44 µs]
+                        thrpt:  [34.738 MiB/s 34.885 MiB/s 35.013 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  3 (6.00%) high mild
+  1 (2.00%) high severe
+
+Benchmarking branch_write/branches_1/1
+Benchmarking branch_write/branches_1/1: Warming up for 1.0000 s
+Benchmarking branch_write/branches_1/1: Collecting 50 samples in estimated 2.0000 s (17M iterations)
+Benchmarking branch_write/branches_1/1: Analyzing
+branch_write/branches_1/1
+                        time:   [119.33 ns 121.68 ns 124.67 ns]
+                        thrpt:  [175.94 MiB/s 180.26 MiB/s 183.82 MiB/s]
+Found 9 outliers among 50 measurements (18.00%)
+  4 (8.00%) high mild
+  5 (10.00%) high severe
+Benchmarking branch_write/branches_16/1
+Benchmarking branch_write/branches_16/1: Warming up for 1.0000 s
+Benchmarking branch_write/branches_16/1: Collecting 50 samples in estimated 2.0000 s (16M iterations)
+Benchmarking branch_write/branches_16/1: Analyzing
+branch_write/branches_16/1
+                        time:   [124.80 ns 125.59 ns 126.60 ns]
+                        thrpt:  [173.25 MiB/s 174.65 MiB/s 175.76 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  2 (4.00%) high mild
+  2 (4.00%) high severe
+Benchmarking branch_write/branches_64/1
+Benchmarking branch_write/branches_64/1: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/1: Collecting 50 samples in estimated 2.0000 s (13M iterations)
+Benchmarking branch_write/branches_64/1: Analyzing
+branch_write/branches_64/1
+                        time:   [149.86 ns 150.26 ns 150.68 ns]
+                        thrpt:  [145.57 MiB/s 145.98 MiB/s 146.37 MiB/s]
+Found 2 outliers among 50 measurements (4.00%)
+  2 (4.00%) high mild
+Benchmarking branch_write/branches_256/1
+Benchmarking branch_write/branches_256/1: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/1: Collecting 50 samples in estimated 2.0000 s (9.2M iterations)
+Benchmarking branch_write/branches_256/1: Analyzing
+branch_write/branches_256/1
+                        time:   [217.95 ns 220.17 ns 222.82 ns]
+                        thrpt:  [98.442 MiB/s 99.625 MiB/s 100.64 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  1 (2.00%) high mild
+  6 (12.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/current-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/current-1.txt
new file mode 100644
index 0000000..540c39a
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/current-1.txt
@@ -0,0 +1,120 @@
+memcap: <=7698 MiB (60% of 12830 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_read/branches_1/1
+Benchmarking branch_read/branches_1/1: Warming up for 1.0000 s
+Benchmarking branch_read/branches_1/1: Collecting 50 samples in estimated 2.0000 s (2.9M iterations)
+Benchmarking branch_read/branches_1/1: Analyzing
+branch_read/branches_1/1
+                        time:   [625.23 ns 633.85 ns 645.73 ns]
+                        thrpt:  [33.969 MiB/s 34.605 MiB/s 35.082 MiB/s]
+Found 8 outliers among 50 measurements (16.00%)
+  3 (6.00%) high mild
+  5 (10.00%) high severe
+Benchmarking branch_read/branches_1/1000
+Benchmarking branch_read/branches_1/1000: Warming up for 1.0000 s
+Benchmarking branch_read/branches_1/1000: Collecting 50 samples in estimated 2.0112 s (7000 iterations)
+Benchmarking branch_read/branches_1/1000: Analyzing
+branch_read/branches_1/1000
+                        time:   [286.10 µs 287.10 µs 288.27 µs]
+                        thrpt:  [39.379 MiB/s 39.539 MiB/s 39.677 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  3 (6.00%) high mild
+  1 (2.00%) high severe
+Benchmarking branch_read/branches_16/1
+Benchmarking branch_read/branches_16/1: Warming up for 1.0000 s
+Benchmarking branch_read/branches_16/1: Collecting 50 samples in estimated 2.0000 s (3.0M iterations)
+Benchmarking branch_read/branches_16/1: Analyzing
+branch_read/branches_16/1
+                        time:   [652.25 ns 656.38 ns 661.95 ns]
+                        thrpt:  [33.136 MiB/s 33.417 MiB/s 33.629 MiB/s]
+Found 8 outliers among 50 measurements (16.00%)
+  4 (8.00%) high mild
+  4 (8.00%) high severe
+Benchmarking branch_read/branches_16/1000
+Benchmarking branch_read/branches_16/1000: Warming up for 1.0000 s
+Benchmarking branch_read/branches_16/1000: Collecting 50 samples in estimated 2.0108 s (6500 iterations)
+Benchmarking branch_read/branches_16/1000: Analyzing
+branch_read/branches_16/1000
+                        time:   [308.03 µs 310.49 µs 313.65 µs]
+                        thrpt:  [38.454 MiB/s 38.845 MiB/s 39.156 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  6 (12.00%) high severe
+Benchmarking branch_read/branches_64/1
+Benchmarking branch_read/branches_64/1: Warming up for 1.0000 s
+Benchmarking branch_read/branches_64/1: Collecting 50 samples in estimated 2.0000 s (3.0M iterations)
+Benchmarking branch_read/branches_64/1: Analyzing
+branch_read/branches_64/1
+                        time:   [644.82 ns 646.19 ns 647.63 ns]
+                        thrpt:  [33.869 MiB/s 33.944 MiB/s 34.016 MiB/s]
+Found 1 outliers among 50 measurements (2.00%)
+  1 (2.00%) high mild
+Benchmarking branch_read/branches_64/1000
+Benchmarking branch_read/branches_64/1000: Warming up for 1.0000 s
+Benchmarking branch_read/branches_64/1000: Collecting 50 samples in estimated 2.0176 s (5600 iterations)
+Benchmarking branch_read/branches_64/1000: Analyzing
+branch_read/branches_64/1000
+                        time:   [345.57 µs 350.53 µs 355.98 µs]
+                        thrpt:  [36.389 MiB/s 36.955 MiB/s 37.485 MiB/s]
+Found 2 outliers among 50 measurements (4.00%)
+  2 (4.00%) high mild
+Benchmarking branch_read/branches_256/1
+Benchmarking branch_read/branches_256/1: Warming up for 1.0000 s
+Benchmarking branch_read/branches_256/1: Collecting 50 samples in estimated 2.0000 s (3.0M iterations)
+Benchmarking branch_read/branches_256/1: Analyzing
+branch_read/branches_256/1
+                        time:   [651.89 ns 662.57 ns 679.77 ns]
+                        thrpt:  [32.268 MiB/s 33.105 MiB/s 33.647 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  1 (2.00%) high mild
+  4 (8.00%) high severe
+Benchmarking branch_read/branches_256/1000
+Benchmarking branch_read/branches_256/1000: Warming up for 1.0000 s
+Benchmarking branch_read/branches_256/1000: Collecting 50 samples in estimated 2.0198 s (4950 iterations)
+Benchmarking branch_read/branches_256/1000: Analyzing
+branch_read/branches_256/1000
+                        time:   [405.80 µs 407.98 µs 411.17 µs]
+                        thrpt:  [34.845 MiB/s 35.117 MiB/s 35.306 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  3 (6.00%) high mild
+  3 (6.00%) high severe
+
+Benchmarking branch_write/branches_1/1
+Benchmarking branch_write/branches_1/1: Warming up for 1.0000 s
+Benchmarking branch_write/branches_1/1: Collecting 50 samples in estimated 2.0000 s (17M iterations)
+Benchmarking branch_write/branches_1/1: Analyzing
+branch_write/branches_1/1
+                        time:   [118.36 ns 118.98 ns 119.71 ns]
+                        thrpt:  [183.23 MiB/s 184.35 MiB/s 185.32 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  2 (4.00%) high mild
+  3 (6.00%) high severe
+Benchmarking branch_write/branches_16/1
+Benchmarking branch_write/branches_16/1: Warming up for 1.0000 s
+Benchmarking branch_write/branches_16/1: Collecting 50 samples in estimated 2.0000 s (16M iterations)
+Benchmarking branch_write/branches_16/1: Analyzing
+branch_write/branches_16/1
+                        time:   [126.03 ns 127.12 ns 128.43 ns]
+                        thrpt:  [170.79 MiB/s 172.54 MiB/s 174.05 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  1 (2.00%) high mild
+  6 (12.00%) high severe
+Benchmarking branch_write/branches_64/1
+Benchmarking branch_write/branches_64/1: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/1: Collecting 50 samples in estimated 2.0000 s (14M iterations)
+Benchmarking branch_write/branches_64/1: Analyzing
+branch_write/branches_64/1
+                        time:   [148.84 ns 149.95 ns 151.28 ns]
+                        thrpt:  [144.99 MiB/s 146.28 MiB/s 147.37 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  4 (8.00%) high mild
+  3 (6.00%) high severe
+Benchmarking branch_write/branches_256/1
+Benchmarking branch_write/branches_256/1: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/1: Collecting 50 samples in estimated 2.0000 s (9.4M iterations)
+Benchmarking branch_write/branches_256/1: Analyzing
+branch_write/branches_256/1
+                        time:   [212.50 ns 215.50 ns 219.83 ns]
+                        thrpt:  [99.781 MiB/s 101.78 MiB/s 103.22 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  2 (4.00%) high mild
+  4 (8.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/current-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/current-build.txt
new file mode 100644
index 0000000..f62e248
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/current-build.txt
@@ -0,0 +1,3 @@
+memcap: <=7657 MiB (60% of 12762 MiB available) [systemd MemoryMax, swap off]
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+    Finished `bench` profile [optimized] target(s) in 2.76s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/current.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/current.lock
new file mode 100644
index 0000000..78a11b2
--- /dev/null
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/harness.rs b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/harness.rs
new file mode 100644
index 0000000..04793ae
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/harness.rs
@@ -0,0 +1,77 @@
+use criterion::{
+    criterion_group, criterion_main, BenchmarkId, Criterion, SamplingMode, Throughput,
+};
+use polyxml::schema::ModelSchema;
+use polyxml::schema_parser::XsdParser;
+use polyxml::{deserialize, serialize, PolyValue};
+use std::{hint::black_box, sync::Arc};
+
+fn fixture(branches: usize, count: usize) -> (Arc<ModelSchema>, Vec<u8>) {
+    let declarations = (0..branches)
+        .map(|i| format!(r#"<xs:element name="B{i}" type="xs:int"/>"#))
+        .collect::<String>();
+    let xsd = format!(
+        r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"><xs:element name="Root"><xs:complexType mixed="true"><xs:choice minOccurs="0" maxOccurs="unbounded">{declarations}</xs:choice></xs:complexType></xs:element></xs:schema>"#
+    );
+    let ir = XsdParser::new().parse_str(&xsd).unwrap();
+    let schema = ModelSchema::from_ir(&ir, Some("Root")).unwrap();
+    let body = (0..count)
+        .map(|i| format!("<B{}>{i}</B{}>", i % branches, i % branches))
+        .collect::<String>();
+    let xml = format!("<Root>{body}</Root>").into_bytes();
+    let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+    let mixed = schema.mixed_content.as_ref().unwrap();
+    let field = &schema.fields[mixed.items_index].name;
+    let items = value.get(field).and_then(PolyValue::as_list).unwrap();
+    assert_eq!(items.len(), count);
+    for (i, item) in items.iter().enumerate() {
+        assert_eq!(item.get("value"), Some(&PolyValue::Int(i as i64)));
+        let kind = item.get("kind").and_then(PolyValue::as_str).unwrap();
+        let branch = mixed
+            .branches
+            .iter()
+            .find(|b| b.variant_name == kind)
+            .unwrap();
+        assert_eq!(branch.xml_name, format!("B{}", i % branches).as_bytes());
+    }
+    let output = serialize("Root", &value, &schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+    let output = serialize("Sensor", &value, &schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    (schema, xml)
+}
+
+fn benchmarks(c: &mut Criterion) {
+    for operation in ["branch_read", "branch_write"] {
+        let mut group = c.benchmark_group(operation);
+        group.sampling_mode(SamplingMode::Flat);
+        for branches in [1, 16, 64, 256] {
+            for count in [1, 32, 64, 128, 1000, 1024] {
+                let (schema, xml) = fixture(branches, count);
+                let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+                group.throughput(Throughput::Bytes(xml.len() as u64));
+                group.bench_with_input(
+                    BenchmarkId::new(format!("branches_{branches}"), count),
+                    &count,
+                    |b, _| {
+                        b.iter(|| {
+                            if operation == "branch_read" {
+                                black_box(
+                                    deserialize(black_box(&xml), Arc::clone(&schema)).unwrap(),
+                                );
+                            } else {
+                                black_box(
+                                    serialize("Root", black_box(&value), &schema, None).unwrap(),
+                                );
+                            }
+                        });
+                    },
+                );
+            }
+        }
+        group.finish();
+    }
+}
+criterion_group!(benches, benchmarks);
+criterion_main!(benches);
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/metadata.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/metadata.json
new file mode 100644
index 0000000..a707c0c
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/metadata.json
@@ -0,0 +1,19 @@
+{
+  "revisions": {
+    "baseline": "1819c91b0808b9242c642d82350d2b657b60108c",
+    "current": "58cb346f964b5196dfad62e8a62a8aa4beb9beef"
+  },
+  "core_status": {
+    "baseline": "",
+    "current": ""
+  },
+  "sample_size": 50,
+  "warmup_seconds": 1.0,
+  "measurement_seconds": 2.0,
+  "rounds": 2,
+  "filter": "^branch_read/.*/(1|1000)$|^branch_write/.*/1$",
+  "order": "alternate baseline/current per round",
+  "os": "Linux-6.18.40.1-microsoft-standard-WSL2-x86_64-with-glibc2.43",
+  "cpu": "11th Gen Intel(R) Core(TM) i5-11600K @ 3.90GHz",
+  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)\nbinary: rustc\ncommit-hash: b940084d7eb6a299eb4bfeb8e34901bc051e7ac4\ncommit-date: 2026-09-28\nhost: x86_64-unknown-linux-gnu\nrelease: 1.99.0\nLLVM version: 23.1.1\n"
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/summary.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/summary.json
new file mode 100644
index 0000000..00bc4f7
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls-sampled/summary.json
@@ -0,0 +1,626 @@
+{
+  "branch_read/branches_1/1": {
+    "baseline_ns": 631.1311386920688,
+    "candidate_ns": 633.8546016963317,
+    "delta_percent": 0.4315209371394513,
+    "speedup": 0.9957033316521261,
+    "process_deltas_percent": [
+      0.965416750032233,
+      -0.09677333322299919
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 624.3770734036017,
+            "upper_bound": 632.2392372028171
+          },
+          "point_estimate": 627.802819240283,
+          "standard_error": 2.034200258562132
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 630.9231405159162,
+            "upper_bound": 639.0043698440402
+          },
+          "point_estimate": 634.4594581438545,
+          "standard_error": 2.0824780889401966
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 627.6791020773014,
+            "upper_bound": 641.3256112218581
+          },
+          "point_estimate": 633.8637328144033,
+          "standard_error": 3.4934054559333383
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 625.2300621417668,
+            "upper_bound": 645.7281184585382
+          },
+          "point_estimate": 633.8454705782601,
+          "standard_error": 5.318854923477674
+        }
+      ]
+    }
+  },
+  "branch_read/branches_1/1000": {
+    "baseline_ns": 293857.89456741087,
+    "candidate_ns": 288127.86994927545,
+    "delta_percent": -1.9499304677761398,
+    "speedup": 1.019887089087023,
+    "process_deltas_percent": [
+      -1.7585932866200138,
+      -2.141883222113994
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 289645.870350365,
+            "upper_bound": 300313.83624817524
+          },
+          "point_estimate": 294329.8376642336,
+          "standard_error": 2755.1881758809072
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 289687.4324191176,
+            "upper_bound": 298517.94683455874
+          },
+          "point_estimate": 293385.95147058816,
+          "standard_error": 2307.515293210743
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 287415.88421014487,
+            "upper_bound": 291527.3568369565
+          },
+          "point_estimate": 289153.7728985508,
+          "standard_error": 1065.6115641179365
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 286097.6701607143,
+            "upper_bound": 288265.6359142857
+          },
+          "point_estimate": 287101.9670000001,
+          "standard_error": 553.402561354283
+        }
+      ]
+    }
+  },
+  "branch_read/branches_16/1": {
+    "baseline_ns": 666.2950685311608,
+    "candidate_ns": 655.3966866244266,
+    "delta_percent": -1.6356690033380583,
+    "speedup": 1.016628680201094,
+    "process_deltas_percent": [
+      -2.046453212573751,
+      -1.2226700590858397
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 649.3620848464706,
+            "upper_bound": 700.9452075808177
+          },
+          "point_estimate": 668.0863979767194,
+          "standard_error": 14.584467183538035
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 658.0881434131089,
+            "upper_bound": 672.4673681707051
+          },
+          "point_estimate": 664.5037390856023,
+          "standard_error": 3.6870558400436355
+        }
+      ],
+      "current": [
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+    "baseline_ns": 116.21215615216789,
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+    "baseline_ns": 128.9688656910686,
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+        {
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+    "baseline_ns": 213.16580308594195,
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+      "current": [
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+  "branch_write/branches_64/1": {
+    "baseline_ns": 146.15343582953057,
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+          "standard_error": 0.360358239037809
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+            "lower_bound": 144.28980712174842,
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+          "standard_error": 0.21155957829997324
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+        {
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+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/baseline-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/baseline-0.txt
new file mode 100644
index 0000000..991413f
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/baseline-0.txt
@@ -0,0 +1,121 @@
+memcap: <=7652 MiB (60% of 12753 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_read/branches_1/1
+Benchmarking branch_read/branches_1/1: Warming up for 1.0000 s
+Benchmarking branch_read/branches_1/1: Collecting 50 samples in estimated 2.0000 s (3.1M iterations)
+Benchmarking branch_read/branches_1/1: Analyzing
+branch_read/branches_1/1
+                        time:   [616.77 ns 619.27 ns 623.17 ns]
+                        thrpt:  [35.198 MiB/s 35.420 MiB/s 35.563 MiB/s]
+Found 2 outliers among 50 measurements (4.00%)
+  1 (2.00%) high mild
+  1 (2.00%) high severe
+Benchmarking branch_read/branches_1/1000
+Benchmarking branch_read/branches_1/1000: Warming up for 1.0000 s
+Benchmarking branch_read/branches_1/1000: Collecting 50 samples in estimated 2.0063 s (6850 iterations)
+Benchmarking branch_read/branches_1/1000: Analyzing
+branch_read/branches_1/1000
+                        time:   [290.75 µs 294.21 µs 298.54 µs]
+                        thrpt:  [38.024 MiB/s 38.583 MiB/s 39.042 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  1 (2.00%) high mild
+  3 (6.00%) high severe
+Benchmarking branch_read/branches_16/1
+Benchmarking branch_read/branches_16/1: Warming up for 1.0000 s
+Benchmarking branch_read/branches_16/1: Collecting 50 samples in estimated 2.0000 s (3.1M iterations)
+Benchmarking branch_read/branches_16/1: Analyzing
+branch_read/branches_16/1
+                        time:   [643.38 ns 651.09 ns 662.64 ns]
+                        thrpt:  [33.102 MiB/s 33.689 MiB/s 34.093 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  3 (6.00%) high mild
+  4 (8.00%) high severe
+Benchmarking branch_read/branches_16/1000
+Benchmarking branch_read/branches_16/1000: Warming up for 1.0000 s
+Benchmarking branch_read/branches_16/1000: Collecting 50 samples in estimated 2.0037 s (6450 iterations)
+Benchmarking branch_read/branches_16/1000: Analyzing
+branch_read/branches_16/1000
+                        time:   [311.23 µs 312.58 µs 314.16 µs]
+                        thrpt:  [38.391 MiB/s 38.585 MiB/s 38.753 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  3 (6.00%) high mild
+  3 (6.00%) high severe
+Benchmarking branch_read/branches_64/1
+Benchmarking branch_read/branches_64/1: Warming up for 1.0000 s
+Benchmarking branch_read/branches_64/1: Collecting 50 samples in estimated 2.0000 s (3.0M iterations)
+Benchmarking branch_read/branches_64/1: Analyzing
+branch_read/branches_64/1
+                        time:   [651.34 ns 655.35 ns 660.42 ns]
+                        thrpt:  [33.213 MiB/s 33.470 MiB/s 33.676 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  1 (2.00%) high mild
+  4 (8.00%) high severe
+Benchmarking branch_read/branches_64/1000
+Benchmarking branch_read/branches_64/1000: Warming up for 1.0000 s
+Benchmarking branch_read/branches_64/1000: Collecting 50 samples in estimated 2.0024 s (5850 iterations)
+Benchmarking branch_read/branches_64/1000: Analyzing
+branch_read/branches_64/1000
+                        time:   [342.35 µs 344.37 µs 346.65 µs]
+                        thrpt:  [37.368 MiB/s 37.615 MiB/s 37.838 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  4 (8.00%) high mild
+  1 (2.00%) high severe
+Benchmarking branch_read/branches_256/1
+Benchmarking branch_read/branches_256/1: Warming up for 1.0000 s
+Benchmarking branch_read/branches_256/1: Collecting 50 samples in estimated 2.0000 s (3.2M iterations)
+Benchmarking branch_read/branches_256/1: Analyzing
+branch_read/branches_256/1
+                        time:   [628.47 ns 637.45 ns 648.83 ns]
+                        thrpt:  [33.806 MiB/s 34.410 MiB/s 34.902 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  1 (2.00%) high mild
+  6 (12.00%) high severe
+Benchmarking branch_read/branches_256/1000
+Benchmarking branch_read/branches_256/1000: Warming up for 1.0000 s
+Benchmarking branch_read/branches_256/1000: Collecting 50 samples in estimated 2.0101 s (4800 iterations)
+Benchmarking branch_read/branches_256/1000: Analyzing
+branch_read/branches_256/1000
+                        time:   [413.27 µs 415.25 µs 417.77 µs]
+                        thrpt:  [34.294 MiB/s 34.502 MiB/s 34.668 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  1 (2.00%) high mild
+  3 (6.00%) high severe
+
+Benchmarking branch_write/branches_1/1
+Benchmarking branch_write/branches_1/1: Warming up for 1.0000 s
+Benchmarking branch_write/branches_1/1: Collecting 50 samples in estimated 2.0000 s (18M iterations)
+Benchmarking branch_write/branches_1/1: Analyzing
+branch_write/branches_1/1
+                        time:   [114.93 ns 116.16 ns 117.68 ns]
+                        thrpt:  [186.40 MiB/s 188.83 MiB/s 190.84 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  1 (2.00%) high mild
+  6 (12.00%) high severe
+Benchmarking branch_write/branches_16/1
+Benchmarking branch_write/branches_16/1: Warming up for 1.0000 s
+Benchmarking branch_write/branches_16/1: Collecting 50 samples in estimated 2.0000 s (17M iterations)
+Benchmarking branch_write/branches_16/1: Analyzing
+branch_write/branches_16/1
+                        time:   [120.95 ns 122.96 ns 125.76 ns]
+                        thrpt:  [174.42 MiB/s 178.39 MiB/s 181.35 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  6 (12.00%) high severe
+Benchmarking branch_write/branches_64/1
+Benchmarking branch_write/branches_64/1: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/1: Collecting 50 samples in estimated 2.0000 s (14M iterations)
+Benchmarking branch_write/branches_64/1: Analyzing
+branch_write/branches_64/1
+                        time:   [143.81 ns 144.45 ns 145.35 ns]
+                        thrpt:  [150.91 MiB/s 151.85 MiB/s 152.52 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  1 (2.00%) high mild
+  2 (4.00%) high severe
+Benchmarking branch_write/branches_256/1
+Benchmarking branch_write/branches_256/1: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/1: Collecting 50 samples in estimated 2.0000 s (9.3M iterations)
+Benchmarking branch_write/branches_256/1: Analyzing
+branch_write/branches_256/1
+                        time:   [211.21 ns 211.64 ns 212.09 ns]
+                        thrpt:  [103.42 MiB/s 103.64 MiB/s 103.85 MiB/s]
+Found 1 outliers among 50 measurements (2.00%)
+  1 (2.00%) high mild
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/baseline-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/baseline-1.txt
new file mode 100644
index 0000000..145d5a0
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/baseline-1.txt
@@ -0,0 +1,121 @@
+memcap: <=7731 MiB (60% of 12886 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_read/branches_1/1
+Benchmarking branch_read/branches_1/1: Warming up for 1.0000 s
+Benchmarking branch_read/branches_1/1: Collecting 50 samples in estimated 2.0000 s (3.0M iterations)
+Benchmarking branch_read/branches_1/1: Analyzing
+branch_read/branches_1/1
+                        time:   [620.79 ns 623.26 ns 626.19 ns]
+                        thrpt:  [35.029 MiB/s 35.193 MiB/s 35.333 MiB/s]
+Found 2 outliers among 50 measurements (4.00%)
+  1 (2.00%) high mild
+  1 (2.00%) high severe
+Benchmarking branch_read/branches_1/1000
+Benchmarking branch_read/branches_1/1000: Warming up for 1.0000 s
+Benchmarking branch_read/branches_1/1000: Collecting 50 samples in estimated 2.0136 s (6900 iterations)
+Benchmarking branch_read/branches_1/1000: Analyzing
+branch_read/branches_1/1000
+                        time:   [291.03 µs 292.85 µs 294.94 µs]
+                        thrpt:  [38.488 MiB/s 38.762 MiB/s 39.005 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  6 (12.00%) high mild
+  1 (2.00%) high severe
+Benchmarking branch_read/branches_16/1
+Benchmarking branch_read/branches_16/1: Warming up for 1.0000 s
+Benchmarking branch_read/branches_16/1: Collecting 50 samples in estimated 2.0000 s (3.1M iterations)
+Benchmarking branch_read/branches_16/1: Analyzing
+branch_read/branches_16/1
+                        time:   [648.19 ns 659.24 ns 676.41 ns]
+                        thrpt:  [32.428 MiB/s 33.272 MiB/s 33.840 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  6 (12.00%) high severe
+Benchmarking branch_read/branches_16/1000
+Benchmarking branch_read/branches_16/1000: Warming up for 1.0000 s
+Benchmarking branch_read/branches_16/1000: Collecting 50 samples in estimated 2.0078 s (6450 iterations)
+Benchmarking branch_read/branches_16/1000: Analyzing
+branch_read/branches_16/1000
+                        time:   [311.23 µs 313.40 µs 316.00 µs]
+                        thrpt:  [38.168 MiB/s 38.485 MiB/s 38.754 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  1 (2.00%) high mild
+  6 (12.00%) high severe
+Benchmarking branch_read/branches_64/1
+Benchmarking branch_read/branches_64/1: Warming up for 1.0000 s
+Benchmarking branch_read/branches_64/1: Collecting 50 samples in estimated 2.0000 s (3.1M iterations)
+Benchmarking branch_read/branches_64/1: Analyzing
+branch_read/branches_64/1
+                        time:   [646.13 ns 653.94 ns 664.00 ns]
+                        thrpt:  [33.034 MiB/s 33.542 MiB/s 33.948 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  1 (2.00%) high mild
+  5 (10.00%) high severe
+Benchmarking branch_read/branches_64/1000
+Benchmarking branch_read/branches_64/1000: Warming up for 1.0000 s
+Benchmarking branch_read/branches_64/1000: Collecting 50 samples in estimated 2.0071 s (5850 iterations)
+Benchmarking branch_read/branches_64/1000: Analyzing
+branch_read/branches_64/1000
+                        time:   [341.33 µs 343.21 µs 345.60 µs]
+                        thrpt:  [37.482 MiB/s 37.743 MiB/s 37.951 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  3 (6.00%) high mild
+  4 (8.00%) high severe
+Benchmarking branch_read/branches_256/1
+Benchmarking branch_read/branches_256/1: Warming up for 1.0000 s
+Benchmarking branch_read/branches_256/1: Collecting 50 samples in estimated 2.0000 s (3.1M iterations)
+Benchmarking branch_read/branches_256/1: Analyzing
+branch_read/branches_256/1
+                        time:   [652.24 ns 658.89 ns 666.82 ns]
+                        thrpt:  [32.894 MiB/s 33.290 MiB/s 33.630 MiB/s]
+Found 8 outliers among 50 measurements (16.00%)
+  2 (4.00%) high mild
+  6 (12.00%) high severe
+Benchmarking branch_read/branches_256/1000
+Benchmarking branch_read/branches_256/1000: Warming up for 1.0000 s
+Benchmarking branch_read/branches_256/1000: Collecting 50 samples in estimated 2.0087 s (4800 iterations)
+Benchmarking branch_read/branches_256/1000: Analyzing
+branch_read/branches_256/1000
+                        time:   [412.21 µs 414.89 µs 418.32 µs]
+                        thrpt:  [34.249 MiB/s 34.532 MiB/s 34.757 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  4 (8.00%) high severe
+
+Benchmarking branch_write/branches_1/1
+Benchmarking branch_write/branches_1/1: Warming up for 1.0000 s
+Benchmarking branch_write/branches_1/1: Collecting 50 samples in estimated 2.0000 s (17M iterations)
+Benchmarking branch_write/branches_1/1: Analyzing
+branch_write/branches_1/1
+                        time:   [112.44 ns 112.84 ns 113.34 ns]
+                        thrpt:  [193.52 MiB/s 194.39 MiB/s 195.09 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  2 (4.00%) high mild
+  1 (2.00%) high severe
+Benchmarking branch_write/branches_16/1
+Benchmarking branch_write/branches_16/1: Warming up for 1.0000 s
+Benchmarking branch_write/branches_16/1: Collecting 50 samples in estimated 2.0000 s (17M iterations)
+Benchmarking branch_write/branches_16/1: Analyzing
+branch_write/branches_16/1
+                        time:   [119.14 ns 119.70 ns 120.44 ns]
+                        thrpt:  [182.12 MiB/s 183.24 MiB/s 184.11 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  2 (4.00%) high mild
+  1 (2.00%) high severe
+Benchmarking branch_write/branches_64/1
+Benchmarking branch_write/branches_64/1: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/1: Collecting 50 samples in estimated 2.0000 s (14M iterations)
+Benchmarking branch_write/branches_64/1: Analyzing
+branch_write/branches_64/1
+                        time:   [142.01 ns 142.97 ns 144.27 ns]
+                        thrpt:  [152.03 MiB/s 153.43 MiB/s 154.46 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  3 (6.00%) high mild
+  2 (4.00%) high severe
+Benchmarking branch_write/branches_256/1
+Benchmarking branch_write/branches_256/1: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/1: Collecting 50 samples in estimated 2.0000 s (9.4M iterations)
+Benchmarking branch_write/branches_256/1: Analyzing
+branch_write/branches_256/1
+                        time:   [208.24 ns 209.13 ns 210.20 ns]
+                        thrpt:  [104.35 MiB/s 104.89 MiB/s 105.33 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  3 (6.00%) high mild
+  1 (2.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/baseline-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/baseline-build.txt
new file mode 100644
index 0000000..2393890
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/baseline-build.txt
@@ -0,0 +1,3 @@
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+    Finished `bench` profile [optimized] target(s) in 2.76s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/baseline.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/baseline.lock
new file mode 100644
index 0000000..78a11b2
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/criterion-SHA256SUMS b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/criterion-SHA256SUMS
new file mode 100644
index 0000000..47786ef
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/criterion-SHA256SUMS
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+92a539fcdeb0f19b7d3a5bd95e06a1eb2a36e0ea299794a42ecd45a27824478a  current-1/branch_read/branches_64/1000/new/sample.json
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+e0a17b4a99bb1ea5975a7ed1f96c4ec4bd9df7aaf4d8112b011d10950a02c12a  current-1/branch_write/branches_16/1/base/benchmark.json
+4e53d57a95d04edcc6d56f1478061bb38d20669ea9598f1e295027d0ebe43189  current-1/branch_write/branches_16/1/base/estimates.json
+aabb1acd4efba88c22960e5d014829f3741c1ca02090783e49288b6ae3f4a6bc  current-1/branch_write/branches_16/1/base/sample.json
+62141c523d48687ba1efeb1d945ca3ff523de2fc5d7bc39c5e911dd99e2dc2bc  current-1/branch_write/branches_16/1/base/tukey.json
+e0a17b4a99bb1ea5975a7ed1f96c4ec4bd9df7aaf4d8112b011d10950a02c12a  current-1/branch_write/branches_16/1/new/benchmark.json
+4e53d57a95d04edcc6d56f1478061bb38d20669ea9598f1e295027d0ebe43189  current-1/branch_write/branches_16/1/new/estimates.json
+aabb1acd4efba88c22960e5d014829f3741c1ca02090783e49288b6ae3f4a6bc  current-1/branch_write/branches_16/1/new/sample.json
+62141c523d48687ba1efeb1d945ca3ff523de2fc5d7bc39c5e911dd99e2dc2bc  current-1/branch_write/branches_16/1/new/tukey.json
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+50d8aee6e926c2e8dcc8262cb12a5077809a06c8d02ddf058d087a76d004e1d4  current-1/branch_write/branches_256/1/base/estimates.json
+7a7a70deb0cda18620a9bb55c47a92dfc0eddae0386d4566548b84c9b152beb8  current-1/branch_write/branches_256/1/base/sample.json
+0ac44da1c79d27698bbee1fa5387b8563a3f5ac65415854dfe5a1bea396192d9  current-1/branch_write/branches_256/1/base/tukey.json
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+50d8aee6e926c2e8dcc8262cb12a5077809a06c8d02ddf058d087a76d004e1d4  current-1/branch_write/branches_256/1/new/estimates.json
+7a7a70deb0cda18620a9bb55c47a92dfc0eddae0386d4566548b84c9b152beb8  current-1/branch_write/branches_256/1/new/sample.json
+0ac44da1c79d27698bbee1fa5387b8563a3f5ac65415854dfe5a1bea396192d9  current-1/branch_write/branches_256/1/new/tukey.json
+33a374dc27e26d0a8246ddcbbda7c08ea7a4ace169c0d17bb2283d668e8f40af  current-1/branch_write/branches_64/1/base/benchmark.json
+ab8ecb53191d14674b783b8ac753c14f8716f19d65b7075fe6971e1b1f3ccf44  current-1/branch_write/branches_64/1/base/estimates.json
+d08c8e39b6fb218f761e3892665abd31358a0d8978b58486c0ae1df721d2570e  current-1/branch_write/branches_64/1/base/sample.json
+7b2f5b6717139e29331753fd372da4f9ec0a0b46a63de8e0cabdf3cb5c981cbc  current-1/branch_write/branches_64/1/base/tukey.json
+33a374dc27e26d0a8246ddcbbda7c08ea7a4ace169c0d17bb2283d668e8f40af  current-1/branch_write/branches_64/1/new/benchmark.json
+ab8ecb53191d14674b783b8ac753c14f8716f19d65b7075fe6971e1b1f3ccf44  current-1/branch_write/branches_64/1/new/estimates.json
+d08c8e39b6fb218f761e3892665abd31358a0d8978b58486c0ae1df721d2570e  current-1/branch_write/branches_64/1/new/sample.json
+7b2f5b6717139e29331753fd372da4f9ec0a0b46a63de8e0cabdf3cb5c981cbc  current-1/branch_write/branches_64/1/new/tukey.json
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/criterion-results.tar.gz b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/criterion-results.tar.gz
new file mode 100644
index 0000000..4d42d39
Binary files /dev/null and b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/criterion-results.tar.gz differ
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/current-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/current-0.txt
new file mode 100644
index 0000000..1b13ef7
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/current-0.txt
@@ -0,0 +1,123 @@
+memcap: <=7733 MiB (60% of 12888 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_read/branches_1/1
+Benchmarking branch_read/branches_1/1: Warming up for 1.0000 s
+Benchmarking branch_read/branches_1/1: Collecting 50 samples in estimated 2.0000 s (3.2M iterations)
+Benchmarking branch_read/branches_1/1: Analyzing
+branch_read/branches_1/1
+                        time:   [620.85 ns 624.71 ns 629.15 ns]
+                        thrpt:  [34.864 MiB/s 35.111 MiB/s 35.330 MiB/s]
+Found 8 outliers among 50 measurements (16.00%)
+  3 (6.00%) high mild
+  5 (10.00%) high severe
+Benchmarking branch_read/branches_1/1000
+Benchmarking branch_read/branches_1/1000: Warming up for 1.0000 s
+Benchmarking branch_read/branches_1/1000: Collecting 50 samples in estimated 2.0023 s (6750 iterations)
+Benchmarking branch_read/branches_1/1000: Analyzing
+branch_read/branches_1/1000
+                        time:   [291.52 µs 292.46 µs 293.54 µs]
+                        thrpt:  [38.671 MiB/s 38.815 MiB/s 38.939 MiB/s]
+Found 2 outliers among 50 measurements (4.00%)
+  1 (2.00%) high mild
+  1 (2.00%) high severe
+Benchmarking branch_read/branches_16/1
+Benchmarking branch_read/branches_16/1: Warming up for 1.0000 s
+Benchmarking branch_read/branches_16/1: Collecting 50 samples in estimated 2.0000 s (3.1M iterations)
+Benchmarking branch_read/branches_16/1: Analyzing
+branch_read/branches_16/1
+                        time:   [647.09 ns 653.76 ns 662.14 ns]
+                        thrpt:  [33.126 MiB/s 33.552 MiB/s 33.897 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  2 (4.00%) high mild
+  3 (6.00%) high severe
+Benchmarking branch_read/branches_16/1000
+Benchmarking branch_read/branches_16/1000: Warming up for 1.0000 s
+Benchmarking branch_read/branches_16/1000: Collecting 50 samples in estimated 2.0036 s (6400 iterations)
+Benchmarking branch_read/branches_16/1000: Analyzing
+branch_read/branches_16/1000
+                        time:   [312.06 µs 314.45 µs 317.38 µs]
+                        thrpt:  [38.002 MiB/s 38.356 MiB/s 38.650 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  1 (2.00%) high mild
+  6 (12.00%) high severe
+Benchmarking branch_read/branches_64/1
+Benchmarking branch_read/branches_64/1: Warming up for 1.0000 s
+Benchmarking branch_read/branches_64/1: Collecting 50 samples in estimated 2.0000 s (3.1M iterations)
+Benchmarking branch_read/branches_64/1: Analyzing
+branch_read/branches_64/1
+                        time:   [634.56 ns 636.78 ns 639.60 ns]
+                        thrpt:  [34.294 MiB/s 34.446 MiB/s 34.567 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  2 (4.00%) high mild
+  2 (4.00%) high severe
+Benchmarking branch_read/branches_64/1000
+Benchmarking branch_read/branches_64/1000: Warming up for 1.0000 s
+Benchmarking branch_read/branches_64/1000: Collecting 50 samples in estimated 2.0136 s (5900 iterations)
+Benchmarking branch_read/branches_64/1000: Analyzing
+branch_read/branches_64/1000
+                        time:   [338.38 µs 341.01 µs 344.64 µs]
+                        thrpt:  [37.587 MiB/s 37.986 MiB/s 38.282 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  2 (4.00%) high mild
+  3 (6.00%) high severe
+Benchmarking branch_read/branches_256/1
+Benchmarking branch_read/branches_256/1: Warming up for 1.0000 s
+Benchmarking branch_read/branches_256/1: Collecting 50 samples in estimated 2.0000 s (3.1M iterations)
+Benchmarking branch_read/branches_256/1: Analyzing
+branch_read/branches_256/1
+                        time:   [652.12 ns 659.57 ns 669.03 ns]
+                        thrpt:  [32.786 MiB/s 33.256 MiB/s 33.636 MiB/s]
+Found 8 outliers among 50 measurements (16.00%)
+  2 (4.00%) high mild
+  6 (12.00%) high severe
+Benchmarking branch_read/branches_256/1000
+Benchmarking branch_read/branches_256/1000: Warming up for 1.0000 s
+Benchmarking branch_read/branches_256/1000: Collecting 50 samples in estimated 2.0078 s (4850 iterations)
+Benchmarking branch_read/branches_256/1000: Analyzing
+branch_read/branches_256/1000
+                        time:   [406.78 µs 408.54 µs 411.13 µs]
+                        thrpt:  [34.848 MiB/s 35.069 MiB/s 35.221 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  3 (6.00%) high mild
+  1 (2.00%) high severe
+
+Benchmarking branch_write/branches_1/1
+Benchmarking branch_write/branches_1/1: Warming up for 1.0000 s
+Benchmarking branch_write/branches_1/1: Collecting 50 samples in estimated 2.0000 s (17M iterations)
+Benchmarking branch_write/branches_1/1: Analyzing
+branch_write/branches_1/1
+                        time:   [116.97 ns 119.34 ns 123.39 ns]
+                        thrpt:  [177.76 MiB/s 183.80 MiB/s 187.52 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  2 (4.00%) high mild
+  4 (8.00%) high severe
+Benchmarking branch_write/branches_16/1
+Benchmarking branch_write/branches_16/1: Warming up for 1.0000 s
+Benchmarking branch_write/branches_16/1: Collecting 50 samples in estimated 2.0000 s (16M iterations)
+Benchmarking branch_write/branches_16/1: Analyzing
+branch_write/branches_16/1
+                        time:   [123.68 ns 124.45 ns 125.41 ns]
+                        thrpt:  [174.90 MiB/s 176.25 MiB/s 177.34 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  2 (4.00%) high mild
+  3 (6.00%) high severe
+Benchmarking branch_write/branches_64/1
+Benchmarking branch_write/branches_64/1: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/1: Collecting 50 samples in estimated 2.0000 s (13M iterations)
+Benchmarking branch_write/branches_64/1: Analyzing
+branch_write/branches_64/1
+                        time:   [147.75 ns 148.78 ns 150.06 ns]
+                        thrpt:  [146.17 MiB/s 147.43 MiB/s 148.45 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  3 (6.00%) high mild
+  4 (8.00%) high severe
+Benchmarking branch_write/branches_256/1
+Benchmarking branch_write/branches_256/1: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/1: Collecting 50 samples in estimated 2.0000 s (9.4M iterations)
+Benchmarking branch_write/branches_256/1: Analyzing
+branch_write/branches_256/1
+                        time:   [213.03 ns 214.15 ns 215.47 ns]
+                        thrpt:  [101.80 MiB/s 102.43 MiB/s 102.96 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  3 (6.00%) high mild
+  3 (6.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/current-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/current-1.txt
new file mode 100644
index 0000000..11e8696
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/current-1.txt
@@ -0,0 +1,123 @@
+memcap: <=7731 MiB (60% of 12885 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_read/branches_1/1
+Benchmarking branch_read/branches_1/1: Warming up for 1.0000 s
+Benchmarking branch_read/branches_1/1: Collecting 50 samples in estimated 2.0000 s (3.0M iterations)
+Benchmarking branch_read/branches_1/1: Analyzing
+branch_read/branches_1/1
+                        time:   [623.62 ns 627.89 ns 633.14 ns]
+                        thrpt:  [34.644 MiB/s 34.934 MiB/s 35.173 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  2 (4.00%) high mild
+  4 (8.00%) high severe
+Benchmarking branch_read/branches_1/1000
+Benchmarking branch_read/branches_1/1000: Warming up for 1.0000 s
+Benchmarking branch_read/branches_1/1000: Collecting 50 samples in estimated 2.0008 s (6850 iterations)
+Benchmarking branch_read/branches_1/1000: Analyzing
+branch_read/branches_1/1000
+                        time:   [292.43 µs 298.30 µs 307.55 µs]
+                        thrpt:  [36.910 MiB/s 38.054 MiB/s 38.818 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  3 (6.00%) high mild
+  4 (8.00%) high severe
+Benchmarking branch_read/branches_16/1
+Benchmarking branch_read/branches_16/1: Warming up for 1.0000 s
+Benchmarking branch_read/branches_16/1: Collecting 50 samples in estimated 2.0000 s (3.0M iterations)
+Benchmarking branch_read/branches_16/1: Analyzing
+branch_read/branches_16/1
+                        time:   [649.41 ns 653.22 ns 659.78 ns]
+                        thrpt:  [33.245 MiB/s 33.579 MiB/s 33.776 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  2 (4.00%) high mild
+  1 (2.00%) high severe
+Benchmarking branch_read/branches_16/1000
+Benchmarking branch_read/branches_16/1000: Warming up for 1.0000 s
+Benchmarking branch_read/branches_16/1000: Collecting 50 samples in estimated 2.0011 s (6250 iterations)
+Benchmarking branch_read/branches_16/1000: Analyzing
+branch_read/branches_16/1000
+                        time:   [313.28 µs 320.73 µs 330.88 µs]
+                        thrpt:  [36.452 MiB/s 37.606 MiB/s 38.500 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  3 (6.00%) high mild
+  4 (8.00%) high severe
+Benchmarking branch_read/branches_64/1
+Benchmarking branch_read/branches_64/1: Warming up for 1.0000 s
+Benchmarking branch_read/branches_64/1: Collecting 50 samples in estimated 2.0000 s (3.0M iterations)
+Benchmarking branch_read/branches_64/1: Analyzing
+branch_read/branches_64/1
+                        time:   [647.69 ns 651.31 ns 655.68 ns]
+                        thrpt:  [33.453 MiB/s 33.677 MiB/s 33.866 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  1 (2.00%) high mild
+  4 (8.00%) high severe
+Benchmarking branch_read/branches_64/1000
+Benchmarking branch_read/branches_64/1000: Warming up for 1.0000 s
+Benchmarking branch_read/branches_64/1000: Collecting 50 samples in estimated 2.0136 s (5950 iterations)
+Benchmarking branch_read/branches_64/1000: Analyzing
+branch_read/branches_64/1000
+                        time:   [338.14 µs 339.67 µs 341.57 µs]
+                        thrpt:  [37.924 MiB/s 38.136 MiB/s 38.308 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  4 (8.00%) high mild
+  1 (2.00%) high severe
+Benchmarking branch_read/branches_256/1
+Benchmarking branch_read/branches_256/1: Warming up for 1.0000 s
+Benchmarking branch_read/branches_256/1: Collecting 50 samples in estimated 2.0000 s (3.2M iterations)
+Benchmarking branch_read/branches_256/1: Analyzing
+branch_read/branches_256/1
+                        time:   [622.42 ns 624.64 ns 627.35 ns]
+                        thrpt:  [34.963 MiB/s 35.115 MiB/s 35.241 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  4 (8.00%) high mild
+  2 (4.00%) high severe
+Benchmarking branch_read/branches_256/1000
+Benchmarking branch_read/branches_256/1000: Warming up for 1.0000 s
+Benchmarking branch_read/branches_256/1000: Collecting 50 samples in estimated 2.0039 s (4850 iterations)
+Benchmarking branch_read/branches_256/1000: Analyzing
+branch_read/branches_256/1000
+                        time:   [419.26 µs 444.61 µs 476.54 µs]
+                        thrpt:  [30.065 MiB/s 32.224 MiB/s 34.173 MiB/s]
+Found 10 outliers among 50 measurements (20.00%)
+  2 (4.00%) high mild
+  8 (16.00%) high severe
+
+Benchmarking branch_write/branches_1/1
+Benchmarking branch_write/branches_1/1: Warming up for 1.0000 s
+Benchmarking branch_write/branches_1/1: Collecting 50 samples in estimated 2.0000 s (17M iterations)
+Benchmarking branch_write/branches_1/1: Analyzing
+branch_write/branches_1/1
+                        time:   [117.06 ns 117.49 ns 118.03 ns]
+                        thrpt:  [185.85 MiB/s 186.69 MiB/s 187.37 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  4 (8.00%) high mild
+  1 (2.00%) high severe
+Benchmarking branch_write/branches_16/1
+Benchmarking branch_write/branches_16/1: Warming up for 1.0000 s
+Benchmarking branch_write/branches_16/1: Collecting 50 samples in estimated 2.0000 s (16M iterations)
+Benchmarking branch_write/branches_16/1: Analyzing
+branch_write/branches_16/1
+                        time:   [123.25 ns 123.82 ns 124.63 ns]
+                        thrpt:  [175.99 MiB/s 177.16 MiB/s 177.96 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  6 (12.00%) high mild
+  1 (2.00%) high severe
+Benchmarking branch_write/branches_64/1
+Benchmarking branch_write/branches_64/1: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/1: Collecting 50 samples in estimated 2.0000 s (14M iterations)
+Benchmarking branch_write/branches_64/1: Analyzing
+branch_write/branches_64/1
+                        time:   [147.49 ns 150.67 ns 154.80 ns]
+                        thrpt:  [141.70 MiB/s 145.58 MiB/s 148.72 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  1 (2.00%) high mild
+  6 (12.00%) high severe
+Benchmarking branch_write/branches_256/1
+Benchmarking branch_write/branches_256/1: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/1: Collecting 50 samples in estimated 2.0000 s (9.3M iterations)
+Benchmarking branch_write/branches_256/1: Analyzing
+branch_write/branches_256/1
+                        time:   [214.30 ns 218.06 ns 223.33 ns]
+                        thrpt:  [98.215 MiB/s 100.59 MiB/s 102.35 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  2 (4.00%) high mild
+  4 (8.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/current-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/current-build.txt
new file mode 100644
index 0000000..4ba2b44
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/current-build.txt
@@ -0,0 +1,3 @@
+memcap: <=7656 MiB (60% of 12760 MiB available) [systemd MemoryMax, swap off]
+   Compiling core-regression v0.0.0 (/home/bailey/github/polyxml-mixed-index/benchmarks/rust-xml-regression/target/core-current)
+    Finished `bench` profile [optimized] target(s) in 2.72s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/current.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/current.lock
new file mode 100644
index 0000000..78a11b2
--- /dev/null
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+version = "1.0.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/harness.rs b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/harness.rs
new file mode 100644
index 0000000..29b2c6a
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/harness.rs
@@ -0,0 +1,77 @@
+use criterion::{
+    criterion_group, criterion_main, BenchmarkId, Criterion, SamplingMode, Throughput,
+};
+use polyxml::schema::ModelSchema;
+use polyxml::schema_parser::XsdParser;
+use polyxml::{deserialize, serialize, PolyValue};
+use std::{hint::black_box, sync::Arc};
+
+fn fixture(branches: usize, count: usize) -> (Arc<ModelSchema>, Vec<u8>) {
+    let declarations = (0..branches)
+        .map(|i| format!(r#"<xs:element name="B{i}" type="xs:int"/>"#))
+        .collect::<String>();
+    let xsd = format!(
+        r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"><xs:element name="Root"><xs:complexType mixed="true"><xs:choice minOccurs="0" maxOccurs="unbounded">{declarations}</xs:choice></xs:complexType></xs:element></xs:schema>"#
+    );
+    let ir = XsdParser::new().parse_str(&xsd).unwrap();
+    let schema = ModelSchema::from_ir(&ir, Some("Root")).unwrap();
+    let body = (0..count)
+        .map(|i| format!("<B{}>{i}</B{}>", i % branches, i % branches))
+        .collect::<String>();
+    let xml = format!("<Root>{body}</Root>").into_bytes();
+    let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+    let mixed = schema.mixed_content.as_ref().unwrap();
+    let field = &schema.fields[mixed.items_index].name;
+    let items = value.get(field).and_then(PolyValue::as_list).unwrap();
+    assert_eq!(items.len(), count);
+    for (i, item) in items.iter().enumerate() {
+        assert_eq!(item.get("value"), Some(&PolyValue::Int(i as i64)));
+        let kind = item.get("kind").and_then(PolyValue::as_str).unwrap();
+        let branch = mixed
+            .branches
+            .iter()
+            .find(|b| b.variant_name == kind)
+            .unwrap();
+        assert_eq!(branch.xml_name, format!("B{}", i % branches).as_bytes());
+    }
+    let output = serialize("Root", &value, &schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+    let output = serialize("Sensor", &value, &schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    (schema, xml)
+}
+
+fn benchmarks(c: &mut Criterion) {
+    for operation in ["branch_read", "branch_write"] {
+        let mut group = c.benchmark_group(operation);
+        group.sampling_mode(SamplingMode::Flat);
+        for branches in [1, 16, 64, 256] {
+            for count in [1, 1000] {
+                let (schema, xml) = fixture(branches, count);
+                let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+                group.throughput(Throughput::Bytes(xml.len() as u64));
+                group.bench_with_input(
+                    BenchmarkId::new(format!("branches_{branches}"), count),
+                    &count,
+                    |b, _| {
+                        b.iter(|| {
+                            if operation == "branch_read" {
+                                black_box(
+                                    deserialize(black_box(&xml), Arc::clone(&schema)).unwrap(),
+                                );
+                            } else {
+                                black_box(
+                                    serialize("Root", black_box(&value), &schema, None).unwrap(),
+                                );
+                            }
+                        });
+                    },
+                );
+            }
+        }
+        group.finish();
+    }
+}
+criterion_group!(benches, benchmarks);
+criterion_main!(benches);
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/metadata.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/metadata.json
new file mode 100644
index 0000000..6a69e1a
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/metadata.json
@@ -0,0 +1,19 @@
+{
+  "revisions": {
+    "baseline": "1819c91b0808b9242c642d82350d2b657b60108c",
+    "current": "d3bf1728be1d265b6b5d317946492cec9b4a6f8c"
+  },
+  "core_status": {
+    "baseline": "",
+    "current": ""
+  },
+  "sample_size": 50,
+  "warmup_seconds": 1.0,
+  "measurement_seconds": 2.0,
+  "rounds": 2,
+  "filter": "^branch_read/|^branch_write/.*/1$",
+  "order": "alternate baseline/current per round",
+  "os": "Linux-6.18.40.1-microsoft-standard-WSL2-x86_64-with-glibc2.43",
+  "cpu": "11th Gen Intel(R) Core(TM) i5-11600K @ 3.90GHz",
+  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)\nbinary: rustc\ncommit-hash: b940084d7eb6a299eb4bfeb8e34901bc051e7ac4\ncommit-date: 2026-09-28\nhost: x86_64-unknown-linux-gnu\nrelease: 1.99.0\nLLVM version: 23.1.1\n"
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/summary.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/summary.json
new file mode 100644
index 0000000..e20e90a
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-controls/summary.json
@@ -0,0 +1,626 @@
+{
+  "branch_read/branches_1/1": {
+    "baseline_ns": 621.2626734532653,
+    "candidate_ns": 626.3000290817656,
+    "delta_percent": 0.8108254114963076,
+    "speedup": 0.9919569608899975,
+    "process_deltas_percent": [
+      0.8791432976396729,
+      0.7429450082029554
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 616.7728294674785,
+            "upper_bound": 623.171069907542
+          },
+          "point_estimate": 619.2671141393643,
+          "standard_error": 1.708072935537374
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 620.7930670725661,
+            "upper_bound": 626.1861704034764
+          },
+          "point_estimate": 623.2582327671664,
+          "standard_error": 1.3787969575994248
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 620.8478306882078,
+            "upper_bound": 629.146614571949
+          },
+          "point_estimate": 624.711359467807,
+          "standard_error": 2.126262416798395
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 623.6182743189698,
+            "upper_bound": 633.1411067607727
+          },
+          "point_estimate": 627.8886986957241,
+          "standard_error": 2.4534354437321158
+        }
+      ]
+    }
+  },
+  "branch_read/branches_1/1000": {
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+    "candidate_ns": 295377.209394431,
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+    "process_deltas_percent": [
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+      1.8592203810329
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/baseline-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/baseline-0.txt
new file mode 100644
index 0000000..683a2f2
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/baseline-0.txt
@@ -0,0 +1,65 @@
+memcap: <=7651 MiB (60% of 12751 MiB available) [systemd MemoryMax, swap off]
+Benchmarking deserialization/sensor_micro
+Benchmarking deserialization/sensor_micro: Warming up for 1.0000 s
+Benchmarking deserialization/sensor_micro: Collecting 50 samples in estimated 2.0003 s (2.1M iterations)
+Benchmarking deserialization/sensor_micro: Analyzing
+deserialization/sensor_micro
+                        time:   [966.46 ns 973.68 ns 982.61 ns]
+                        thrpt:  [91.232 MiB/s 92.069 MiB/s 92.757 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  2 (4.00%) high mild
+  1 (2.00%) high severe
+Benchmarking deserialization/catalog_items/1000
+Benchmarking deserialization/catalog_items/1000: Warming up for 1.0000 s
+Benchmarking deserialization/catalog_items/1000: Collecting 50 samples in estimated 2.0276 s (2550 iterations)
+Benchmarking deserialization/catalog_items/1000: Analyzing
+deserialization/catalog_items/1000
+                        time:   [786.08 µs 795.64 µs 807.90 µs]
+                        thrpt:  [75.443 MiB/s 76.606 MiB/s 77.537 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  2 (4.00%) high mild
+  5 (10.00%) high severe
+Benchmarking deserialization/catalog_items/10000
+Benchmarking deserialization/catalog_items/10000: Warming up for 1.0000 s
+Benchmarking deserialization/catalog_items/10000: Collecting 50 samples in estimated 2.3815 s (300 iterations)
+Benchmarking deserialization/catalog_items/10000: Analyzing
+deserialization/catalog_items/10000
+                        time:   [7.8400 ms 7.9007 ms 7.9793 ms]
+                        thrpt:  [79.947 MiB/s 80.742 MiB/s 81.368 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  1 (2.00%) high mild
+  4 (8.00%) high severe
+
+Benchmarking serialization/sensor_micro
+Benchmarking serialization/sensor_micro: Warming up for 1.0000 s
+Benchmarking serialization/sensor_micro: Collecting 50 samples in estimated 2.0001 s (8.8M iterations)
+Benchmarking serialization/sensor_micro: Analyzing
+serialization/sensor_micro
+                        time:   [224.90 ns 227.36 ns 230.53 ns]
+                        thrpt:  [388.87 MiB/s 394.29 MiB/s 398.59 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  3 (6.00%) high mild
+  3 (6.00%) high severe
+Benchmarking serialization/catalog_items/1000
+Benchmarking serialization/catalog_items/1000: Warming up for 1.0000 s
+Benchmarking serialization/catalog_items/1000: Collecting 50 samples in estimated 2.0514 s (11k iterations)
+Benchmarking serialization/catalog_items/1000: Analyzing
+serialization/catalog_items/1000
+                        time:   [175.78 µs 176.30 µs 176.94 µs]
+                        thrpt:  [341.77 MiB/s 343.01 MiB/s 344.02 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  1 (2.00%) high mild
+  4 (8.00%) high severe
+Benchmarking serialization/catalog_items/10000
+Benchmarking serialization/catalog_items/10000: Warming up for 1.0000 s
+
+Warning: Unable to complete 50 samples in 2.0s. You may wish to increase target time to 2.3s, enable flat sampling, or reduce sample count to 30.
+Benchmarking serialization/catalog_items/10000: Collecting 50 samples in estimated 2.2850 s (1275 iterations)
+Benchmarking serialization/catalog_items/10000: Analyzing
+serialization/catalog_items/10000
+                        time:   [1.7790 ms 1.7910 ms 1.8060 ms]
+                        thrpt:  [350.58 MiB/s 353.52 MiB/s 355.91 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  3 (6.00%) high mild
+  2 (4.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/baseline-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/baseline-1.txt
new file mode 100644
index 0000000..efa6986
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/baseline-1.txt
@@ -0,0 +1,65 @@
+memcap: <=7709 MiB (60% of 12848 MiB available) [systemd MemoryMax, swap off]
+Benchmarking deserialization/sensor_micro
+Benchmarking deserialization/sensor_micro: Warming up for 1.0000 s
+Benchmarking deserialization/sensor_micro: Collecting 50 samples in estimated 2.0008 s (2.0M iterations)
+Benchmarking deserialization/sensor_micro: Analyzing
+deserialization/sensor_micro
+                        time:   [972.84 ns 986.27 ns 1.0025 µs]
+                        thrpt:  [89.423 MiB/s 90.893 MiB/s 92.148 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  4 (8.00%) high mild
+  3 (6.00%) high severe
+Benchmarking deserialization/catalog_items/1000
+Benchmarking deserialization/catalog_items/1000: Warming up for 1.0000 s
+Benchmarking deserialization/catalog_items/1000: Collecting 50 samples in estimated 2.9921 s (3825 iterations)
+Benchmarking deserialization/catalog_items/1000: Analyzing
+deserialization/catalog_items/1000
+                        time:   [783.84 µs 791.36 µs 800.48 µs]
+                        thrpt:  [76.142 MiB/s 77.020 MiB/s 77.758 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  4 (8.00%) high mild
+  1 (2.00%) high severe
+Benchmarking deserialization/catalog_items/10000
+Benchmarking deserialization/catalog_items/10000: Warming up for 1.0000 s
+Benchmarking deserialization/catalog_items/10000: Collecting 50 samples in estimated 2.3717 s (300 iterations)
+Benchmarking deserialization/catalog_items/10000: Analyzing
+deserialization/catalog_items/10000
+                        time:   [7.8609 ms 7.8908 ms 7.9271 ms]
+                        thrpt:  [80.474 MiB/s 80.844 MiB/s 81.151 MiB/s]
+Found 2 outliers among 50 measurements (4.00%)
+  1 (2.00%) high mild
+  1 (2.00%) high severe
+
+Benchmarking serialization/sensor_micro
+Benchmarking serialization/sensor_micro: Warming up for 1.0000 s
+Benchmarking serialization/sensor_micro: Collecting 50 samples in estimated 2.0003 s (8.8M iterations)
+Benchmarking serialization/sensor_micro: Analyzing
+serialization/sensor_micro
+                        time:   [226.79 ns 229.21 ns 232.49 ns]
+                        thrpt:  [385.58 MiB/s 391.10 MiB/s 395.28 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  2 (4.00%) high mild
+  1 (2.00%) high severe
+Benchmarking serialization/catalog_items/1000
+Benchmarking serialization/catalog_items/1000: Warming up for 1.0000 s
+Benchmarking serialization/catalog_items/1000: Collecting 50 samples in estimated 2.0327 s (11k iterations)
+Benchmarking serialization/catalog_items/1000: Analyzing
+serialization/catalog_items/1000
+                        time:   [175.95 µs 176.43 µs 176.96 µs]
+                        thrpt:  [341.73 MiB/s 342.76 MiB/s 343.70 MiB/s]
+Found 2 outliers among 50 measurements (4.00%)
+  1 (2.00%) high mild
+  1 (2.00%) high severe
+Benchmarking serialization/catalog_items/10000
+Benchmarking serialization/catalog_items/10000: Warming up for 1.0000 s
+
+Warning: Unable to complete 50 samples in 2.0s. You may wish to increase target time to 2.3s, enable flat sampling, or reduce sample count to 30.
+Benchmarking serialization/catalog_items/10000: Collecting 50 samples in estimated 2.2996 s (1275 iterations)
+Benchmarking serialization/catalog_items/10000: Analyzing
+serialization/catalog_items/10000
+                        time:   [1.7784 ms 1.7857 ms 1.7943 ms]
+                        thrpt:  [352.87 MiB/s 354.58 MiB/s 356.02 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  5 (10.00%) high mild
+  1 (2.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/baseline-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/baseline-build.txt
new file mode 100644
index 0000000..023b6a3
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/baseline-build.txt
@@ -0,0 +1,3 @@
+memcap: <=7710 MiB (60% of 12851 MiB available) [systemd MemoryMax, swap off]
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+    Finished `bench` profile [optimized] target(s) in 2.56s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/baseline.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/baseline.lock
new file mode 100644
index 0000000..78a11b2
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/baseline.lock
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/criterion-SHA256SUMS b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/criterion-SHA256SUMS
new file mode 100644
index 0000000..9bc986f
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/criterion-SHA256SUMS
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/criterion-results.tar.gz b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/criterion-results.tar.gz
new file mode 100644
index 0000000..5c38d17
Binary files /dev/null and b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/criterion-results.tar.gz differ
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/current-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/current-0.txt
new file mode 100644
index 0000000..fbe23c7
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/current-0.txt
@@ -0,0 +1,64 @@
+memcap: <=7701 MiB (60% of 12836 MiB available) [systemd MemoryMax, swap off]
+Benchmarking deserialization/sensor_micro
+Benchmarking deserialization/sensor_micro: Warming up for 1.0000 s
+Benchmarking deserialization/sensor_micro: Collecting 50 samples in estimated 2.0006 s (2.0M iterations)
+Benchmarking deserialization/sensor_micro: Analyzing
+deserialization/sensor_micro
+                        time:   [966.27 ns 971.60 ns 978.62 ns]
+                        thrpt:  [91.604 MiB/s 92.266 MiB/s 92.775 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  2 (4.00%) high mild
+  2 (4.00%) high severe
+Benchmarking deserialization/catalog_items/1000
+Benchmarking deserialization/catalog_items/1000: Warming up for 1.0000 s
+Benchmarking deserialization/catalog_items/1000: Collecting 50 samples in estimated 2.0421 s (2550 iterations)
+Benchmarking deserialization/catalog_items/1000: Analyzing
+deserialization/catalog_items/1000
+                        time:   [784.13 µs 786.15 µs 788.54 µs]
+                        thrpt:  [77.295 MiB/s 77.530 MiB/s 77.730 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  4 (8.00%) high severe
+Benchmarking deserialization/catalog_items/10000
+Benchmarking deserialization/catalog_items/10000: Warming up for 1.0000 s
+Benchmarking deserialization/catalog_items/10000: Collecting 50 samples in estimated 2.3523 s (300 iterations)
+Benchmarking deserialization/catalog_items/10000: Analyzing
+deserialization/catalog_items/10000
+                        time:   [7.9213 ms 8.0054 ms 8.1089 ms]
+                        thrpt:  [78.669 MiB/s 79.687 MiB/s 80.533 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  2 (4.00%) high mild
+  2 (4.00%) high severe
+
+Benchmarking serialization/sensor_micro
+Benchmarking serialization/sensor_micro: Warming up for 1.0000 s
+Benchmarking serialization/sensor_micro: Collecting 50 samples in estimated 2.0001 s (9.1M iterations)
+Benchmarking serialization/sensor_micro: Analyzing
+serialization/sensor_micro
+                        time:   [219.11 ns 221.07 ns 223.63 ns]
+                        thrpt:  [400.86 MiB/s 405.51 MiB/s 409.13 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  3 (6.00%) high mild
+  2 (4.00%) high severe
+Benchmarking serialization/catalog_items/1000
+Benchmarking serialization/catalog_items/1000: Warming up for 1.0000 s
+Benchmarking serialization/catalog_items/1000: Collecting 50 samples in estimated 2.0252 s (11k iterations)
+Benchmarking serialization/catalog_items/1000: Analyzing
+serialization/catalog_items/1000
+                        time:   [173.54 µs 174.58 µs 176.30 µs]
+                        thrpt:  [343.02 MiB/s 346.40 MiB/s 348.47 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  3 (6.00%) high mild
+  3 (6.00%) high severe
+Benchmarking serialization/catalog_items/10000
+Benchmarking serialization/catalog_items/10000: Warming up for 1.0000 s
+
+Warning: Unable to complete 50 samples in 2.0s. You may wish to increase target time to 2.3s, enable flat sampling, or reduce sample count to 30.
+Benchmarking serialization/catalog_items/10000: Collecting 50 samples in estimated 2.2525 s (1275 iterations)
+Benchmarking serialization/catalog_items/10000: Analyzing
+serialization/catalog_items/10000
+                        time:   [1.7494 ms 1.7551 ms 1.7611 ms]
+                        thrpt:  [359.53 MiB/s 360.75 MiB/s 361.93 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  6 (12.00%) high mild
+  1 (2.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/current-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/current-1.txt
new file mode 100644
index 0000000..fafb046
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/current-1.txt
@@ -0,0 +1,63 @@
+memcap: <=7703 MiB (60% of 12839 MiB available) [systemd MemoryMax, swap off]
+Benchmarking deserialization/sensor_micro
+Benchmarking deserialization/sensor_micro: Warming up for 1.0000 s
+Benchmarking deserialization/sensor_micro: Collecting 50 samples in estimated 2.0007 s (2.0M iterations)
+Benchmarking deserialization/sensor_micro: Analyzing
+deserialization/sensor_micro
+                        time:   [970.29 ns 974.67 ns 980.55 ns]
+                        thrpt:  [91.424 MiB/s 91.975 MiB/s 92.391 MiB/s]
+Found 8 outliers among 50 measurements (16.00%)
+  4 (8.00%) high mild
+  4 (8.00%) high severe
+Benchmarking deserialization/catalog_items/1000
+Benchmarking deserialization/catalog_items/1000: Warming up for 1.0000 s
+Benchmarking deserialization/catalog_items/1000: Collecting 50 samples in estimated 2.0021 s (2550 iterations)
+Benchmarking deserialization/catalog_items/1000: Analyzing
+deserialization/catalog_items/1000
+                        time:   [783.21 µs 787.34 µs 792.40 µs]
+                        thrpt:  [76.918 MiB/s 77.413 MiB/s 77.821 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  2 (4.00%) high mild
+  1 (2.00%) high severe
+Benchmarking deserialization/catalog_items/10000
+Benchmarking deserialization/catalog_items/10000: Warming up for 1.0000 s
+Benchmarking deserialization/catalog_items/10000: Collecting 50 samples in estimated 2.0567 s (250 iterations)
+Benchmarking deserialization/catalog_items/10000: Analyzing
+deserialization/catalog_items/10000
+                        time:   [7.8647 ms 7.9524 ms 8.0746 ms]
+                        thrpt:  [79.004 MiB/s 80.218 MiB/s 81.112 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  3 (6.00%) high severe
+
+Benchmarking serialization/sensor_micro
+Benchmarking serialization/sensor_micro: Warming up for 1.0000 s
+Benchmarking serialization/sensor_micro: Collecting 50 samples in estimated 2.0000 s (9.1M iterations)
+Benchmarking serialization/sensor_micro: Analyzing
+serialization/sensor_micro
+                        time:   [220.07 ns 222.59 ns 226.14 ns]
+                        thrpt:  [396.42 MiB/s 402.74 MiB/s 407.35 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  1 (2.00%) high mild
+  5 (10.00%) high severe
+Benchmarking serialization/catalog_items/1000
+Benchmarking serialization/catalog_items/1000: Warming up for 1.0000 s
+Benchmarking serialization/catalog_items/1000: Collecting 50 samples in estimated 2.0023 s (11k iterations)
+Benchmarking serialization/catalog_items/1000: Analyzing
+serialization/catalog_items/1000
+                        time:   [173.93 µs 175.07 µs 176.38 µs]
+                        thrpt:  [342.86 MiB/s 345.41 MiB/s 347.69 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  3 (6.00%) high mild
+  1 (2.00%) high severe
+Benchmarking serialization/catalog_items/10000
+Benchmarking serialization/catalog_items/10000: Warming up for 1.0000 s
+
+Warning: Unable to complete 50 samples in 2.0s. You may wish to increase target time to 2.3s, enable flat sampling, or reduce sample count to 30.
+Benchmarking serialization/catalog_items/10000: Collecting 50 samples in estimated 2.3412 s (1275 iterations)
+Benchmarking serialization/catalog_items/10000: Analyzing
+serialization/catalog_items/10000
+                        time:   [1.7591 ms 1.7692 ms 1.7796 ms]
+                        thrpt:  [355.78 MiB/s 357.88 MiB/s 359.92 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  3 (6.00%) high mild
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/current-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/current-build.txt
new file mode 100644
index 0000000..f9f7e68
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/current-build.txt
@@ -0,0 +1,3 @@
+memcap: <=7665 MiB (60% of 12775 MiB available) [systemd MemoryMax, swap off]
+   Compiling core-regression v0.0.0 (/home/bailey/github/polyxml-mixed-index/benchmarks/rust-xml-regression/target/core-current)
+    Finished `bench` profile [optimized] target(s) in 2.52s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/current.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/current.lock
new file mode 100644
index 0000000..78a11b2
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/current.lock
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/harness.rs b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/harness.rs
new file mode 100644
index 0000000..073ad98
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/harness.rs
@@ -0,0 +1,172 @@
+use std::hint::black_box;
+
+use criterion::{criterion_group, criterion_main, BenchmarkId, Criterion, Throughput};
+use polyxml::schema::{FieldKind, FieldSchema, ModelSchema, ScalarType, ValueType};
+use polyxml::{deserialize, serialize};
+use std::sync::Arc;
+
+fn build_sensor_fixture() -> (Arc<ModelSchema>, Vec<u8>) {
+    let schema = ModelSchema::builder("Sensor")
+        .field(FieldSchema::new(
+            "id",
+            b"id",
+            FieldKind::Attribute,
+            ValueType::Scalar(ScalarType::Int),
+        ))
+        .field(FieldSchema::new(
+            "temp",
+            b"temp",
+            FieldKind::Element,
+            ValueType::Scalar(ScalarType::Float),
+        ))
+        .field(FieldSchema::new(
+            "status",
+            b"status",
+            FieldKind::Element,
+            ValueType::Scalar(ScalarType::String),
+        ))
+        .field(FieldSchema::new(
+            "active",
+            b"active",
+            FieldKind::Element,
+            ValueType::Scalar(ScalarType::Bool),
+        ))
+        .build();
+
+    let xml = br#"<Sensor id="1001"><temp>23.75</temp><status>OPERATIONAL</status><active>true</active></Sensor>"#.to_vec();
+    let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+    let output = serialize("Sensor", &value, &schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    (schema, xml)
+}
+
+fn build_catalog_fixture(count: usize) -> (Arc<ModelSchema>, Vec<u8>) {
+    let item_schema = ModelSchema::builder("Item")
+        .field(FieldSchema::new(
+            "id",
+            b"id",
+            FieldKind::Attribute,
+            ValueType::Scalar(ScalarType::Int),
+        ))
+        .field(FieldSchema::new(
+            "name",
+            b"name",
+            FieldKind::Element,
+            ValueType::Scalar(ScalarType::String),
+        ))
+        .field(FieldSchema::new(
+            "price",
+            b"price",
+            FieldKind::Element,
+            ValueType::Scalar(ScalarType::Float),
+        ))
+        .build();
+
+    let catalog_schema = ModelSchema::builder("Catalog")
+        .field(FieldSchema::new(
+            "items",
+            b"item",
+            FieldKind::Element,
+            ValueType::List(Box::new(ValueType::Nested(item_schema))),
+        ))
+        .build();
+
+    let mut xml = String::with_capacity(count * 64 + 32);
+    xml.push_str("<Catalog>");
+    for i in 0..count {
+        use std::fmt::Write;
+        write!(
+            xml,
+            r#"<item id="{i}"><name>Part-{i}</name><price>{:.2}</price></item>"#,
+            (i as f64) * 1.25
+        )
+        .unwrap();
+    }
+    xml.push_str("</Catalog>");
+
+    let xml = xml.into_bytes();
+    let value = deserialize(&xml, Arc::clone(&catalog_schema)).unwrap();
+    assert_eq!(value.get("items").unwrap().as_list().unwrap().len(), count);
+    let output = serialize("Catalog", &value, &catalog_schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&catalog_schema)).unwrap());
+    (catalog_schema, xml)
+}
+
+fn bench_deserialization(c: &mut Criterion) {
+    let mut group = c.benchmark_group("deserialization");
+
+    // 1. Sensor Telemetry (Micro)
+    {
+        let (schema, xml) = build_sensor_fixture();
+        group.throughput(Throughput::Bytes(xml.len() as u64));
+        group.bench_function("sensor_micro", |b| {
+            b.iter(|| {
+                let res = deserialize(black_box(&xml), Arc::clone(&schema)).unwrap();
+                black_box(res);
+            });
+        });
+    }
+
+    // 2. Catalog Batch (1,000 and 10,000 items)
+    for &count in &[1_000, 10_000] {
+        let (schema, xml) = build_catalog_fixture(count);
+        group.throughput(Throughput::Bytes(xml.len() as u64));
+        group.bench_with_input(BenchmarkId::new("catalog_items", count), &count, |b, _| {
+            b.iter(|| {
+                let res = deserialize(black_box(&xml), Arc::clone(&schema)).unwrap();
+                black_box(res);
+            });
+        });
+    }
+
+    group.finish();
+}
+
+fn bench_serialization(c: &mut Criterion) {
+    let mut group = c.benchmark_group("serialization");
+
+    // 1. Sensor Telemetry (Micro)
+    {
+        let (schema, xml) = build_sensor_fixture();
+        let val = deserialize(&xml, Arc::clone(&schema)).unwrap();
+        let expected_bytes = serialize("Sensor", &val, &schema, None).unwrap();
+        group.throughput(Throughput::Bytes(expected_bytes.len() as u64));
+        group.bench_function("sensor_micro", |b| {
+            b.iter(|| {
+                let res = serialize(
+                    black_box("Sensor"),
+                    black_box(&val),
+                    black_box(&schema),
+                    black_box(None),
+                )
+                .unwrap();
+                black_box(res);
+            });
+        });
+    }
+
+    // 2. Catalog Batch (1,000 and 10,000 items)
+    for &count in &[1_000, 10_000] {
+        let (schema, xml) = build_catalog_fixture(count);
+        let val = deserialize(&xml, Arc::clone(&schema)).unwrap();
+        let expected_bytes = serialize("Catalog", &val, &schema, None).unwrap();
+        group.throughput(Throughput::Bytes(expected_bytes.len() as u64));
+        group.bench_with_input(BenchmarkId::new("catalog_items", count), &count, |b, _| {
+            b.iter(|| {
+                let res = serialize(
+                    black_box("Catalog"),
+                    black_box(&val),
+                    black_box(&schema),
+                    black_box(None),
+                )
+                .unwrap();
+                black_box(res);
+            });
+        });
+    }
+
+    group.finish();
+}
+
+criterion_group!(benches, bench_deserialization, bench_serialization);
+criterion_main!(benches);
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/metadata.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/metadata.json
new file mode 100644
index 0000000..ba17918
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/metadata.json
@@ -0,0 +1,19 @@
+{
+  "revisions": {
+    "baseline": "1819c91b0808b9242c642d82350d2b657b60108c",
+    "current": "58cb346f964b5196dfad62e8a62a8aa4beb9beef"
+  },
+  "core_status": {
+    "baseline": "",
+    "current": ""
+  },
+  "sample_size": 50,
+  "warmup_seconds": 1.0,
+  "measurement_seconds": 2.0,
+  "rounds": 2,
+  "filter": "",
+  "order": "alternate baseline/current per round",
+  "os": "Linux-6.18.40.1-microsoft-standard-WSL2-x86_64-with-glibc2.43",
+  "cpu": "11th Gen Intel(R) Core(TM) i5-11600K @ 3.90GHz",
+  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)\nbinary: rustc\ncommit-hash: b940084d7eb6a299eb4bfeb8e34901bc051e7ac4\ncommit-date: 2026-09-28\nhost: x86_64-unknown-linux-gnu\nrelease: 1.99.0\nLLVM version: 23.1.1\n"
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/summary.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/summary.json
new file mode 100644
index 0000000..6bb2c0f
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core-sampled/summary.json
@@ -0,0 +1,314 @@
+{
+  "deserialization/catalog_items/1000": {
+    "baseline_ns": 793024.1941387265,
+    "candidate_ns": 788782.701332467,
+    "delta_percent": -0.5348503661815718,
+    "speedup": 1.005377263977892,
+    "process_deltas_percent": [
+      -0.9128181659829426,
+      -0.1532189285283425
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 786003.4756122844,
+            "upper_bound": 810820.3497253131
+          },
+          "point_estimate": 796849.0445490867,
+          "standard_error": 6402.997119757658
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 784660.540227991,
+            "upper_bound": 794445.5924186303
+          },
+          "point_estimate": 789199.3437283662,
+          "standard_error": 2498.817416242239
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 785114.9579108084,
+            "upper_bound": 795033.6508541139
+          },
+          "point_estimate": 789575.2617149812,
+          "standard_error": 2548.6419277774194
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 784149.5685343469,
+            "upper_bound": 793046.868591132
+          },
+          "point_estimate": 787990.1409499529,
+          "standard_error": 2301.993653703528
+        }
+      ]
+    }
+  },
+  "deserialization/catalog_items/10000": {
+    "baseline_ns": 7895752.201666668,
+    "candidate_ns": 7978879.928666668,
+    "delta_percent": 1.0528158036982704,
+    "speedup": 0.9895815292693732,
+    "process_deltas_percent": [
+      1.3244581829310542,
+      0.7808295815508348
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 7839985.258999999,
+            "upper_bound": 7979308.291083333
+          },
+          "point_estimate": 7900746.233333332,
+          "standard_error": 35885.877248569086
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 7860927.98825,
+            "upper_bound": 7927053.890666669
+          },
+          "point_estimate": 7890758.170000004,
+          "standard_error": 16970.991767683074
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 7921255.543500001,
+            "upper_bound": 8108919.768250001
+          },
+          "point_estimate": 8005388.313333333,
+          "standard_error": 48342.71845699823
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 7864736.652500001,
+            "upper_bound": 8074598.1154000005
+          },
+          "point_estimate": 7952371.544000003,
+          "standard_error": 54679.364425965694
+        }
+      ]
+    }
+  },
+  "deserialization/sensor_micro": {
+    "baseline_ns": 973.7217015919964,
+    "candidate_ns": 979.3454425583147,
+    "delta_percent": 0.5775511583159476,
+    "speedup": 0.994257653406108,
+    "process_deltas_percent": [
+      0.21306627144528356,
+      0.9390735587917254
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 965.214357330426,
+            "upper_bound": 975.2261738036833
+          },
+          "point_estimate": 969.7484118693947,
+          "standard_error": 2.5681401585426222
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 970.8222830910153,
+            "upper_bound": 986.0556723961647
+          },
+          "point_estimate": 977.6949913145983,
+          "standard_error": 3.920289123793753
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 967.1471120613426,
+            "upper_bound": 977.5104411472809
+          },
+          "point_estimate": 971.8146186529647,
+          "standard_error": 2.659095035377566
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 976.5514303134356,
+            "upper_bound": 998.5659803695836
+          },
+          "point_estimate": 986.8762664636648,
+          "standard_error": 5.61950170865454
+        }
+      ]
+    }
+  },
+  "serialization/catalog_items/1000": {
+    "baseline_ns": 176797.8714723356,
+    "candidate_ns": 175013.16719972747,
+    "delta_percent": -1.0094602710685852,
+    "speedup": 1.0101975428544265,
+    "process_deltas_percent": [
+      -1.0041842310988591,
+      -1.0147442249333394
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 176017.2712763741,
+            "upper_bound": 177991.7821393811
+          },
+          "point_estimate": 176930.36774242506,
+          "standard_error": 507.2777442769649
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 175924.3960591368,
+            "upper_bound": 177701.02766081895
+          },
+          "point_estimate": 176665.37520224613,
+          "standard_error": 462.2198802385539
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 173976.13572642242,
+            "upper_bound": 176694.31025695926
+          },
+          "point_estimate": 175153.6608895304,
+          "standard_error": 702.7465764078911
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 174033.60217427797,
+            "upper_bound": 175842.3111765072
+          },
+          "point_estimate": 174872.67350992453,
+          "standard_error": 462.8501703592067
+        }
+      ]
+    }
+  },
+  "serialization/catalog_items/10000": {
+    "baseline_ns": 1790068.7788419863,
+    "candidate_ns": 1758616.1679985097,
+    "delta_percent": -1.7570615841824622,
+    "speedup": 1.0178848639150595,
+    "process_deltas_percent": [
+      -2.011095696710141,
+      -1.5032323258466929
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 1777204.3790911671,
+            "upper_bound": 1805860.0634140302
+          },
+          "point_estimate": 1789346.7281602153,
+          "standard_error": 7422.687668618754
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 1781331.4721887063,
+            "upper_bound": 1802361.4462591219
+          },
+          "point_estimate": 1790790.829523757,
+          "standard_error": 5395.62092717549
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 1749045.6835319665,
+            "upper_bound": 1758273.4550228363
+          },
+          "point_estimate": 1753361.2531109615,
+          "standard_error": 2356.7477217794853
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 1756526.7650219118,
+            "upper_bound": 1771743.5299504944
+          },
+          "point_estimate": 1763871.082886058,
+          "standard_error": 3881.6108154808817
+        }
+      ]
+    }
+  },
+  "serialization/sensor_micro": {
+    "baseline_ns": 230.06471658768544,
+    "candidate_ns": 221.4487020601976,
+    "delta_percent": -3.745039506831105,
+    "speedup": 1.0389074961710352,
+    "process_deltas_percent": [
+      -2.8238785155460633,
+      -4.638421883607446
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 224.98160301983344,
+            "upper_bound": 228.4092872673318
+          },
+          "point_estimate": 226.54268499195106,
+          "standard_error": 0.8824800295521743
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 230.3788857925616,
+            "upper_bound": 237.25160940283286
+          },
+          "point_estimate": 233.58674818341984,
+          "standard_error": 1.7584889368848218
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 219.03783453400087,
+            "upper_bound": 221.5142442936973
+          },
+          "point_estimate": 220.14539478192216,
+          "standard_error": 0.6375840830231396
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 220.08952840358944,
+            "upper_bound": 226.38148222327493
+          },
+          "point_estimate": 222.75200933847307,
+          "standard_error": 1.6279323846307783
+        }
+      ]
+    }
+  }
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core/baseline-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core/baseline-0.txt
new file mode 100644
index 0000000..776e5be
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core/baseline-0.txt
@@ -0,0 +1,64 @@
+memcap: <=7654 MiB (60% of 12756 MiB available) [systemd MemoryMax, swap off]
+Benchmarking deserialization/sensor_micro
+Benchmarking deserialization/sensor_micro: Warming up for 1.0000 s
+Benchmarking deserialization/sensor_micro: Collecting 50 samples in estimated 2.0001 s (2.0M iterations)
+Benchmarking deserialization/sensor_micro: Analyzing
+deserialization/sensor_micro
+                        time:   [984.11 ns 1.0007 µs 1.0220 µs]
+                        thrpt:  [87.718 MiB/s 89.583 MiB/s 91.093 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  1 (2.00%) high mild
+  5 (10.00%) high severe
+Benchmarking deserialization/catalog_items/1000
+Benchmarking deserialization/catalog_items/1000: Warming up for 1.0000 s
+Benchmarking deserialization/catalog_items/1000: Collecting 50 samples in estimated 2.0385 s (2550 iterations)
+Benchmarking deserialization/catalog_items/1000: Analyzing
+deserialization/catalog_items/1000
+                        time:   [789.72 µs 800.28 µs 812.53 µs]
+                        thrpt:  [75.013 MiB/s 76.161 MiB/s 77.179 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  2 (4.00%) high mild
+  5 (10.00%) high severe
+Benchmarking deserialization/catalog_items/10000
+Benchmarking deserialization/catalog_items/10000: Warming up for 1.0000 s
+Benchmarking deserialization/catalog_items/10000: Collecting 50 samples in estimated 2.3923 s (300 iterations)
+Benchmarking deserialization/catalog_items/10000: Analyzing
+deserialization/catalog_items/10000
+                        time:   [7.8334 ms 7.8567 ms 7.8857 ms]
+                        thrpt:  [80.896 MiB/s 81.195 MiB/s 81.436 MiB/s]
+Found 1 outliers among 50 measurements (2.00%)
+  1 (2.00%) high severe
+
+Benchmarking serialization/sensor_micro
+Benchmarking serialization/sensor_micro: Warming up for 1.0000 s
+Benchmarking serialization/sensor_micro: Collecting 50 samples in estimated 2.0002 s (8.7M iterations)
+Benchmarking serialization/sensor_micro: Analyzing
+serialization/sensor_micro
+                        time:   [224.84 ns 226.35 ns 228.26 ns]
+                        thrpt:  [392.74 MiB/s 396.05 MiB/s 398.70 MiB/s]
+Found 9 outliers among 50 measurements (18.00%)
+  3 (6.00%) high mild
+  6 (12.00%) high severe
+Benchmarking serialization/catalog_items/1000
+Benchmarking serialization/catalog_items/1000: Warming up for 1.0000 s
+Benchmarking serialization/catalog_items/1000: Collecting 50 samples in estimated 2.0495 s (11k iterations)
+Benchmarking serialization/catalog_items/1000: Analyzing
+serialization/catalog_items/1000
+                        time:   [176.58 µs 177.50 µs 178.83 µs]
+                        thrpt:  [338.17 MiB/s 340.69 MiB/s 342.48 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  3 (6.00%) high mild
+  2 (4.00%) high severe
+Benchmarking serialization/catalog_items/10000
+Benchmarking serialization/catalog_items/10000: Warming up for 1.0000 s
+
+Warning: Unable to complete 50 samples in 2.0s. You may wish to increase target time to 2.3s, enable flat sampling, or reduce sample count to 30.
+Benchmarking serialization/catalog_items/10000: Collecting 50 samples in estimated 2.2780 s (1275 iterations)
+Benchmarking serialization/catalog_items/10000: Analyzing
+serialization/catalog_items/10000
+                        time:   [1.7788 ms 1.7876 ms 1.7996 ms]
+                        thrpt:  [351.84 MiB/s 354.20 MiB/s 355.95 MiB/s]
+Found 8 outliers among 50 measurements (16.00%)
+  6 (12.00%) high mild
+  2 (4.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core/baseline-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core/baseline-1.txt
new file mode 100644
index 0000000..a2a3fd5
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core/baseline-1.txt
@@ -0,0 +1,63 @@
+memcap: <=7736 MiB (60% of 12893 MiB available) [systemd MemoryMax, swap off]
+Benchmarking deserialization/sensor_micro
+Benchmarking deserialization/sensor_micro: Warming up for 1.0000 s
+Benchmarking deserialization/sensor_micro: Collecting 50 samples in estimated 2.0010 s (2.0M iterations)
+Benchmarking deserialization/sensor_micro: Analyzing
+deserialization/sensor_micro
+                        time:   [965.50 ns 978.27 ns 994.53 ns]
+                        thrpt:  [90.138 MiB/s 91.636 MiB/s 92.849 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  2 (4.00%) high mild
+  4 (8.00%) high severe
+Benchmarking deserialization/catalog_items/1000
+Benchmarking deserialization/catalog_items/1000: Warming up for 1.0000 s
+Benchmarking deserialization/catalog_items/1000: Collecting 50 samples in estimated 2.0694 s (2550 iterations)
+Benchmarking deserialization/catalog_items/1000: Analyzing
+deserialization/catalog_items/1000
+                        time:   [783.46 µs 789.04 µs 796.02 µs]
+                        thrpt:  [76.569 MiB/s 77.246 MiB/s 77.796 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  5 (10.00%) high severe
+Benchmarking deserialization/catalog_items/10000
+Benchmarking deserialization/catalog_items/10000: Warming up for 1.0000 s
+Benchmarking deserialization/catalog_items/10000: Collecting 50 samples in estimated 2.3656 s (300 iterations)
+Benchmarking deserialization/catalog_items/10000: Analyzing
+deserialization/catalog_items/10000
+                        time:   [7.9800 ms 8.1110 ms 8.2780 ms]
+                        thrpt:  [77.062 MiB/s 78.649 MiB/s 79.940 MiB/s]
+Found 10 outliers among 50 measurements (20.00%)
+  3 (6.00%) high mild
+  7 (14.00%) high severe
+
+Benchmarking serialization/sensor_micro
+Benchmarking serialization/sensor_micro: Warming up for 1.0000 s
+Benchmarking serialization/sensor_micro: Collecting 50 samples in estimated 2.0003 s (8.8M iterations)
+Benchmarking serialization/sensor_micro: Analyzing
+serialization/sensor_micro
+                        time:   [224.80 ns 226.22 ns 227.80 ns]
+                        thrpt:  [393.52 MiB/s 396.28 MiB/s 398.78 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  3 (6.00%) high mild
+  1 (2.00%) high severe
+Benchmarking serialization/catalog_items/1000
+Benchmarking serialization/catalog_items/1000: Warming up for 1.0000 s
+Benchmarking serialization/catalog_items/1000: Collecting 50 samples in estimated 2.0497 s (11k iterations)
+Benchmarking serialization/catalog_items/1000: Analyzing
+serialization/catalog_items/1000
+                        time:   [183.96 µs 185.87 µs 188.01 µs]
+                        thrpt:  [321.65 MiB/s 325.36 MiB/s 328.73 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  2 (4.00%) high mild
+  3 (6.00%) high severe
+Benchmarking serialization/catalog_items/10000
+Benchmarking serialization/catalog_items/10000: Warming up for 1.0000 s
+
+Warning: Unable to complete 50 samples in 2.0s. You may wish to increase target time to 2.4s, enable flat sampling, or reduce sample count to 30.
+Benchmarking serialization/catalog_items/10000: Collecting 50 samples in estimated 2.3521 s (1275 iterations)
+Benchmarking serialization/catalog_items/10000: Analyzing
+serialization/catalog_items/10000
+                        time:   [1.7885 ms 1.8004 ms 1.8162 ms]
+                        thrpt:  [348.61 MiB/s 351.68 MiB/s 354.02 MiB/s]
+Found 2 outliers among 50 measurements (4.00%)
+  2 (4.00%) high mild
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core/baseline-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core/baseline-build.txt
new file mode 100644
index 0000000..858b106
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core/baseline-build.txt
@@ -0,0 +1,3 @@
+memcap: <=7734 MiB (60% of 12891 MiB available) [systemd MemoryMax, swap off]
+   Compiling core-regression v0.0.0 (/home/bailey/github/polyxml-mixed-index/benchmarks/rust-xml-regression/target/core-baseline)
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core/criterion-SHA256SUMS b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core/criterion-SHA256SUMS
new file mode 100644
index 0000000..089ef5a
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core/criterion-SHA256SUMS
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+cfe39de7c2b787f61a355fca4819a049faedf51d0547524ef323c61cdf1400c7  current-1/serialization/catalog_items/10000/new/sample.json
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core/criterion-results.tar.gz b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core/criterion-results.tar.gz
new file mode 100644
index 0000000..4759cba
Binary files /dev/null and b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core/criterion-results.tar.gz differ
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core/current-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core/current-0.txt
new file mode 100644
index 0000000..a83d1fa
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core/current-0.txt
@@ -0,0 +1,62 @@
+memcap: <=7729 MiB (60% of 12882 MiB available) [systemd MemoryMax, swap off]
+Benchmarking deserialization/sensor_micro
+Benchmarking deserialization/sensor_micro: Warming up for 1.0000 s
+Benchmarking deserialization/sensor_micro: Collecting 50 samples in estimated 2.0002 s (2.0M iterations)
+Benchmarking deserialization/sensor_micro: Analyzing
+deserialization/sensor_micro
+                        time:   [1.0036 µs 1.0230 µs 1.0469 µs]
+                        thrpt:  [85.626 MiB/s 87.626 MiB/s 89.320 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  3 (6.00%) high mild
+  2 (4.00%) high severe
+Benchmarking deserialization/catalog_items/1000
+Benchmarking deserialization/catalog_items/1000: Warming up for 1.0000 s
+Benchmarking deserialization/catalog_items/1000: Collecting 50 samples in estimated 2.0239 s (2550 iterations)
+Benchmarking deserialization/catalog_items/1000: Analyzing
+deserialization/catalog_items/1000
+                        time:   [791.71 µs 799.80 µs 810.49 µs]
+                        thrpt:  [75.202 MiB/s 76.206 MiB/s 76.986 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  3 (6.00%) high mild
+  4 (8.00%) high severe
+Benchmarking deserialization/catalog_items/10000
+Benchmarking deserialization/catalog_items/10000: Warming up for 1.0000 s
+Benchmarking deserialization/catalog_items/10000: Collecting 50 samples in estimated 2.3973 s (300 iterations)
+Benchmarking deserialization/catalog_items/10000: Analyzing
+deserialization/catalog_items/10000
+                        time:   [7.9358 ms 7.9779 ms 8.0328 ms]
+                        thrpt:  [79.414 MiB/s 79.961 MiB/s 80.386 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  1 (2.00%) high mild
+  2 (4.00%) high severe
+
+Benchmarking serialization/sensor_micro
+Benchmarking serialization/sensor_micro: Warming up for 1.0000 s
+Benchmarking serialization/sensor_micro: Collecting 50 samples in estimated 2.0003 s (8.9M iterations)
+Benchmarking serialization/sensor_micro: Analyzing
+serialization/sensor_micro
+                        time:   [220.68 ns 221.48 ns 222.52 ns]
+                        thrpt:  [402.87 MiB/s 404.75 MiB/s 406.23 MiB/s]
+Benchmarking serialization/catalog_items/1000
+Benchmarking serialization/catalog_items/1000: Warming up for 1.0000 s
+Benchmarking serialization/catalog_items/1000: Collecting 50 samples in estimated 2.0053 s (11k iterations)
+Benchmarking serialization/catalog_items/1000: Analyzing
+serialization/catalog_items/1000
+                        time:   [175.70 µs 178.24 µs 181.35 µs]
+                        thrpt:  [333.46 MiB/s 339.28 MiB/s 344.18 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  4 (8.00%) high mild
+  2 (4.00%) high severe
+Benchmarking serialization/catalog_items/10000
+Benchmarking serialization/catalog_items/10000: Warming up for 1.0000 s
+
+Warning: Unable to complete 50 samples in 2.0s. You may wish to increase target time to 2.3s, enable flat sampling, or reduce sample count to 30.
+Benchmarking serialization/catalog_items/10000: Collecting 50 samples in estimated 2.2843 s (1275 iterations)
+Benchmarking serialization/catalog_items/10000: Analyzing
+serialization/catalog_items/10000
+                        time:   [1.7742 ms 1.7949 ms 1.8192 ms]
+                        thrpt:  [348.04 MiB/s 352.75 MiB/s 356.87 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  3 (6.00%) high mild
+  4 (8.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core/current-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core/current-1.txt
new file mode 100644
index 0000000..d2ab9e7
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core/current-1.txt
@@ -0,0 +1,63 @@
+memcap: <=7732 MiB (60% of 12887 MiB available) [systemd MemoryMax, swap off]
+Benchmarking deserialization/sensor_micro
+Benchmarking deserialization/sensor_micro: Warming up for 1.0000 s
+Benchmarking deserialization/sensor_micro: Collecting 50 samples in estimated 2.0011 s (2.0M iterations)
+Benchmarking deserialization/sensor_micro: Analyzing
+deserialization/sensor_micro
+                        time:   [988.68 ns 1.0005 µs 1.0197 µs]
+                        thrpt:  [87.914 MiB/s 89.598 MiB/s 90.672 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  1 (2.00%) high mild
+  5 (10.00%) high severe
+Benchmarking deserialization/catalog_items/1000
+Benchmarking deserialization/catalog_items/1000: Warming up for 1.0000 s
+Benchmarking deserialization/catalog_items/1000: Collecting 50 samples in estimated 2.0425 s (2550 iterations)
+Benchmarking deserialization/catalog_items/1000: Analyzing
+deserialization/catalog_items/1000
+                        time:   [794.18 µs 798.28 µs 802.74 µs]
+                        thrpt:  [75.928 MiB/s 76.352 MiB/s 76.746 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  3 (6.00%) high mild
+Benchmarking deserialization/catalog_items/10000
+Benchmarking deserialization/catalog_items/10000: Warming up for 1.0000 s
+Benchmarking deserialization/catalog_items/10000: Collecting 50 samples in estimated 2.0081 s (250 iterations)
+Benchmarking deserialization/catalog_items/10000: Analyzing
+deserialization/catalog_items/10000
+                        time:   [7.9953 ms 8.0362 ms 8.0851 ms]
+                        thrpt:  [78.901 MiB/s 79.381 MiB/s 79.788 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  4 (8.00%) high mild
+  1 (2.00%) high severe
+
+Benchmarking serialization/sensor_micro
+Benchmarking serialization/sensor_micro: Warming up for 1.0000 s
+Benchmarking serialization/sensor_micro: Collecting 50 samples in estimated 2.0000 s (9.0M iterations)
+Benchmarking serialization/sensor_micro: Analyzing
+serialization/sensor_micro
+                        time:   [220.20 ns 221.59 ns 223.58 ns]
+                        thrpt:  [400.96 MiB/s 404.56 MiB/s 407.10 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  4 (8.00%) high severe
+Benchmarking serialization/catalog_items/1000
+Benchmarking serialization/catalog_items/1000: Warming up for 1.0000 s
+Benchmarking serialization/catalog_items/1000: Collecting 50 samples in estimated 2.0338 s (11k iterations)
+Benchmarking serialization/catalog_items/1000: Analyzing
+serialization/catalog_items/1000
+                        time:   [176.18 µs 178.21 µs 180.77 µs]
+                        thrpt:  [334.53 MiB/s 339.34 MiB/s 343.26 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  4 (8.00%) high mild
+  2 (4.00%) high severe
+Benchmarking serialization/catalog_items/10000
+Benchmarking serialization/catalog_items/10000: Warming up for 1.0000 s
+
+Warning: Unable to complete 50 samples in 2.0s. You may wish to increase target time to 2.3s, enable flat sampling, or reduce sample count to 30.
+Benchmarking serialization/catalog_items/10000: Collecting 50 samples in estimated 2.2881 s (1275 iterations)
+Benchmarking serialization/catalog_items/10000: Analyzing
+serialization/catalog_items/10000
+                        time:   [1.7861 ms 1.8084 ms 1.8365 ms]
+                        thrpt:  [344.76 MiB/s 350.11 MiB/s 354.49 MiB/s]
+Found 8 outliers among 50 measurements (16.00%)
+  4 (8.00%) high mild
+  4 (8.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core/current-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core/current-build.txt
new file mode 100644
index 0000000..b0e46bd
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core/current-build.txt
@@ -0,0 +1,3 @@
+memcap: <=7695 MiB (60% of 12825 MiB available) [systemd MemoryMax, swap off]
+   Compiling core-regression v0.0.0 (/home/bailey/github/polyxml-mixed-index/benchmarks/rust-xml-regression/target/core-current)
+    Finished `bench` profile [optimized] target(s) in 2.53s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core/current.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core/current.lock
new file mode 100644
index 0000000..78a11b2
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core/current.lock
@@ -0,0 +1,633 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "aho-corasick"
+version = "1.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c982642fa9e8606056828ee9a8505737230110bb1099153c79efe865c59d12ba"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "alloca"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6df92bf3d9227be3d53173901ddbffac2babc27ae50f397776ffd6dc33f800cb"
+dependencies = [
+ "zerocopy-derive",
+]
+
+[[package]]
+name = "zerocopy-derive"
+version = "0.8.59"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac4f328cf2f05d084e496c3e9c3f33ed0a183656a16e1fcec4d464d8373aec82"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.119",
+]
+
+[[package]]
+name = "zmij"
+version = "1.0.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "29666d0abbfad1e3dc4dcf6144730dd3a3ab225bbbdac83319345b1b44ccfc1b"
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core/harness.rs b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core/harness.rs
new file mode 100644
index 0000000..073ad98
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core/harness.rs
@@ -0,0 +1,172 @@
+use std::hint::black_box;
+
+use criterion::{criterion_group, criterion_main, BenchmarkId, Criterion, Throughput};
+use polyxml::schema::{FieldKind, FieldSchema, ModelSchema, ScalarType, ValueType};
+use polyxml::{deserialize, serialize};
+use std::sync::Arc;
+
+fn build_sensor_fixture() -> (Arc<ModelSchema>, Vec<u8>) {
+    let schema = ModelSchema::builder("Sensor")
+        .field(FieldSchema::new(
+            "id",
+            b"id",
+            FieldKind::Attribute,
+            ValueType::Scalar(ScalarType::Int),
+        ))
+        .field(FieldSchema::new(
+            "temp",
+            b"temp",
+            FieldKind::Element,
+            ValueType::Scalar(ScalarType::Float),
+        ))
+        .field(FieldSchema::new(
+            "status",
+            b"status",
+            FieldKind::Element,
+            ValueType::Scalar(ScalarType::String),
+        ))
+        .field(FieldSchema::new(
+            "active",
+            b"active",
+            FieldKind::Element,
+            ValueType::Scalar(ScalarType::Bool),
+        ))
+        .build();
+
+    let xml = br#"<Sensor id="1001"><temp>23.75</temp><status>OPERATIONAL</status><active>true</active></Sensor>"#.to_vec();
+    let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+    let output = serialize("Sensor", &value, &schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    (schema, xml)
+}
+
+fn build_catalog_fixture(count: usize) -> (Arc<ModelSchema>, Vec<u8>) {
+    let item_schema = ModelSchema::builder("Item")
+        .field(FieldSchema::new(
+            "id",
+            b"id",
+            FieldKind::Attribute,
+            ValueType::Scalar(ScalarType::Int),
+        ))
+        .field(FieldSchema::new(
+            "name",
+            b"name",
+            FieldKind::Element,
+            ValueType::Scalar(ScalarType::String),
+        ))
+        .field(FieldSchema::new(
+            "price",
+            b"price",
+            FieldKind::Element,
+            ValueType::Scalar(ScalarType::Float),
+        ))
+        .build();
+
+    let catalog_schema = ModelSchema::builder("Catalog")
+        .field(FieldSchema::new(
+            "items",
+            b"item",
+            FieldKind::Element,
+            ValueType::List(Box::new(ValueType::Nested(item_schema))),
+        ))
+        .build();
+
+    let mut xml = String::with_capacity(count * 64 + 32);
+    xml.push_str("<Catalog>");
+    for i in 0..count {
+        use std::fmt::Write;
+        write!(
+            xml,
+            r#"<item id="{i}"><name>Part-{i}</name><price>{:.2}</price></item>"#,
+            (i as f64) * 1.25
+        )
+        .unwrap();
+    }
+    xml.push_str("</Catalog>");
+
+    let xml = xml.into_bytes();
+    let value = deserialize(&xml, Arc::clone(&catalog_schema)).unwrap();
+    assert_eq!(value.get("items").unwrap().as_list().unwrap().len(), count);
+    let output = serialize("Catalog", &value, &catalog_schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&catalog_schema)).unwrap());
+    (catalog_schema, xml)
+}
+
+fn bench_deserialization(c: &mut Criterion) {
+    let mut group = c.benchmark_group("deserialization");
+
+    // 1. Sensor Telemetry (Micro)
+    {
+        let (schema, xml) = build_sensor_fixture();
+        group.throughput(Throughput::Bytes(xml.len() as u64));
+        group.bench_function("sensor_micro", |b| {
+            b.iter(|| {
+                let res = deserialize(black_box(&xml), Arc::clone(&schema)).unwrap();
+                black_box(res);
+            });
+        });
+    }
+
+    // 2. Catalog Batch (1,000 and 10,000 items)
+    for &count in &[1_000, 10_000] {
+        let (schema, xml) = build_catalog_fixture(count);
+        group.throughput(Throughput::Bytes(xml.len() as u64));
+        group.bench_with_input(BenchmarkId::new("catalog_items", count), &count, |b, _| {
+            b.iter(|| {
+                let res = deserialize(black_box(&xml), Arc::clone(&schema)).unwrap();
+                black_box(res);
+            });
+        });
+    }
+
+    group.finish();
+}
+
+fn bench_serialization(c: &mut Criterion) {
+    let mut group = c.benchmark_group("serialization");
+
+    // 1. Sensor Telemetry (Micro)
+    {
+        let (schema, xml) = build_sensor_fixture();
+        let val = deserialize(&xml, Arc::clone(&schema)).unwrap();
+        let expected_bytes = serialize("Sensor", &val, &schema, None).unwrap();
+        group.throughput(Throughput::Bytes(expected_bytes.len() as u64));
+        group.bench_function("sensor_micro", |b| {
+            b.iter(|| {
+                let res = serialize(
+                    black_box("Sensor"),
+                    black_box(&val),
+                    black_box(&schema),
+                    black_box(None),
+                )
+                .unwrap();
+                black_box(res);
+            });
+        });
+    }
+
+    // 2. Catalog Batch (1,000 and 10,000 items)
+    for &count in &[1_000, 10_000] {
+        let (schema, xml) = build_catalog_fixture(count);
+        let val = deserialize(&xml, Arc::clone(&schema)).unwrap();
+        let expected_bytes = serialize("Catalog", &val, &schema, None).unwrap();
+        group.throughput(Throughput::Bytes(expected_bytes.len() as u64));
+        group.bench_with_input(BenchmarkId::new("catalog_items", count), &count, |b, _| {
+            b.iter(|| {
+                let res = serialize(
+                    black_box("Catalog"),
+                    black_box(&val),
+                    black_box(&schema),
+                    black_box(None),
+                )
+                .unwrap();
+                black_box(res);
+            });
+        });
+    }
+
+    group.finish();
+}
+
+criterion_group!(benches, bench_deserialization, bench_serialization);
+criterion_main!(benches);
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core/metadata.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core/metadata.json
new file mode 100644
index 0000000..0bba916
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core/metadata.json
@@ -0,0 +1,19 @@
+{
+  "revisions": {
+    "baseline": "1819c91b0808b9242c642d82350d2b657b60108c",
+    "current": "d3bf1728be1d265b6b5d317946492cec9b4a6f8c"
+  },
+  "core_status": {
+    "baseline": "",
+    "current": ""
+  },
+  "sample_size": 50,
+  "warmup_seconds": 1.0,
+  "measurement_seconds": 2.0,
+  "rounds": 2,
+  "filter": "",
+  "order": "alternate baseline/current per round",
+  "os": "Linux-6.18.40.1-microsoft-standard-WSL2-x86_64-with-glibc2.43",
+  "cpu": "11th Gen Intel(R) Core(TM) i5-11600K @ 3.90GHz",
+  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)\nbinary: rustc\ncommit-hash: b940084d7eb6a299eb4bfeb8e34901bc051e7ac4\ncommit-date: 2026-09-28\nhost: x86_64-unknown-linux-gnu\nrelease: 1.99.0\nLLVM version: 23.1.1\n"
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core/summary.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core/summary.json
new file mode 100644
index 0000000..82b5870
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-core/summary.json
@@ -0,0 +1,314 @@
+{
+  "deserialization/catalog_items/1000": {
+    "baseline_ns": 794214.4065569597,
+    "candidate_ns": 798093.0453884681,
+    "delta_percent": 0.48836168161729976,
+    "speedup": 0.9951401169902183,
+    "process_deltas_percent": [
+      0.07272405477622979,
+      0.9074322205996799
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 789694.0575539211,
+            "upper_bound": 806560.8985931715
+          },
+          "point_estimate": 797480.7796328802,
+          "standard_error": 4325.720788364533
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 784363.6275347313,
+            "upper_bound": 799025.5439318795
+          },
+          "point_estimate": 790948.0334810392,
+          "standard_error": 3777.15687271325
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 792348.4740756826,
+            "upper_bound": 804961.2887180363
+          },
+          "point_estimate": 798060.7399918904,
+          "standard_error": 3240.1290225780112
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 795134.1510626642,
+            "upper_bound": 801431.5220448561
+          },
+          "point_estimate": 798125.3507850457,
+          "standard_error": 1609.4779827705308
+        }
+      ]
+    }
+  },
+  "deserialization/catalog_items/10000": {
+    "baseline_ns": 7983824.753333335,
+    "candidate_ns": 8007057.926000003,
+    "delta_percent": 0.2910030390755658,
+    "speedup": 0.99709841331468,
+    "process_deltas_percent": [
+      1.543062779190496,
+      -0.9217959376344398
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 7833443.8319166675,
+            "upper_bound": 7885676.472999998
+          },
+          "point_estimate": 7856656.793333334,
+          "standard_error": 13407.552840121058
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 7980003.624750001,
+            "upper_bound": 8278041.835083335
+          },
+          "point_estimate": 8110992.713333336,
+          "standard_error": 76708.81339220669
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 7935782.533583332,
+            "upper_bound": 8032849.171666669
+          },
+          "point_estimate": 7977889.940000001,
+          "standard_error": 25089.746929408688
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 7995254.7635,
+            "upper_bound": 8085135.397300001
+          },
+          "point_estimate": 8036225.912000003,
+          "standard_error": 23021.19492847627
+        }
+      ]
+    }
+  },
+  "deserialization/sensor_micro": {
+    "baseline_ns": 981.2786364389249,
+    "candidate_ns": 1013.5401051285522,
+    "delta_percent": 3.2876970405373074,
+    "speedup": 0.96816951936447,
+    "process_deltas_percent": [
+      3.158397008714231,
+      3.4193464648257343
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 981.3140995402727,
+            "upper_bound": 1001.2342619894108
+          },
+          "point_estimate": 990.1133305946256,
+          "standard_error": 5.133127744143527
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 964.7906026877024,
+            "upper_bound": 981.6153017767981
+          },
+          "point_estimate": 972.443942283224,
+          "standard_error": 4.334105865372758
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 1004.9120374996454,
+            "upper_bound": 1042.4872499903504
+          },
+          "point_estimate": 1021.385040411007,
+          "standard_error": 9.63263642680912
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 995.2070953910005,
+            "upper_bound": 1018.7498532395375
+          },
+          "point_estimate": 1005.6951698460974,
+          "standard_error": 6.062930386080829
+        }
+      ]
+    }
+  },
+  "serialization/catalog_items/1000": {
+    "baseline_ns": 181295.30505430995,
+    "candidate_ns": 177597.75460482438,
+    "delta_percent": -2.0395180384720435,
+    "speedup": 1.0208198040437677,
+    "process_deltas_percent": [
+      0.010815036302802561,
+      -4.000241089492773
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 176627.2299720362,
+            "upper_bound": 177959.2749883287
+          },
+          "point_estimate": 177245.03099109087,
+          "standard_error": 340.9138513333625
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 183341.2097612919,
+            "upper_bound": 187820.61330510207
+          },
+          "point_estimate": 185345.579117529,
+          "standard_error": 1149.5785172412154
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 175360.11926291167,
+            "upper_bound": 179814.3740627805
+          },
+          "point_estimate": 177264.2001055375,
+          "standard_error": 1152.8245396215007
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 175981.39354740918,
+            "upper_bound": 180212.99112350435
+          },
+          "point_estimate": 177931.30910411128,
+          "standard_error": 1083.1109472222497
+        }
+      ]
+    }
+  },
+  "serialization/catalog_items/10000": {
+    "baseline_ns": 1811847.2980606128,
+    "candidate_ns": 1796843.460628629,
+    "delta_percent": -0.8280961341523563,
+    "speedup": 1.0083501082652657,
+    "process_deltas_percent": [
+      -0.3662859487902792,
+      -1.2812019984950296
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 1783876.1200385108,
+            "upper_bound": 1808036.8504058453
+          },
+          "point_estimate": 1794609.7596815405,
+          "standard_error": 6224.251092951574
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 1812587.9893485843,
+            "upper_bound": 1847487.2646033464
+          },
+          "point_estimate": 1829084.8364396847,
+          "standard_error": 8947.361925743302
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 1777354.8693892977,
+            "upper_bound": 1800689.7379657254
+          },
+          "point_estimate": 1788036.356296208,
+          "standard_error": 6001.872936633647
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 1784054.0236303322,
+            "upper_bound": 1833530.5968862912
+          },
+          "point_estimate": 1805650.56496105,
+          "standard_error": 12687.80093140197
+        }
+      ]
+    }
+  },
+  "serialization/sensor_micro": {
+    "baseline_ns": 226.34549204471244,
+    "candidate_ns": 224.55717375635396,
+    "delta_percent": -0.7900834570211845,
+    "speedup": 1.007963754880077,
+    "process_deltas_percent": [
+      -0.08521372031684571,
+      -1.5003817974513334
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 225.65515538714712,
+            "upper_bound": 229.0428890783507
+          },
+          "point_estimate": 227.2137563882112,
+          "standard_error": 0.8685902426584772
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 224.58414922223227,
+            "upper_bound": 226.4838164700616
+          },
+          "point_estimate": 225.4772277012137,
+          "standard_error": 0.48568161229068485
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 224.4423895002145,
+            "upper_bound": 229.8373794186145
+          },
+          "point_estimate": 227.02013909332115,
+          "standard_error": 1.3787764212170397
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 220.27785233286204,
+            "upper_bound": 224.4251630837977
+          },
+          "point_estimate": 222.0942084193868,
+          "standard_error": 1.067394051223539
+        }
+      ]
+    }
+  }
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-refined/baseline-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-refined/baseline-0.txt
new file mode 100644
index 0000000..71d77c8
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-refined/baseline-0.txt
@@ -0,0 +1,62 @@
+memcap: <=7653 MiB (60% of 12755 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_64/32
+Benchmarking branch_write/branches_64/32: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/32: Collecting 50 samples in estimated 2.0001 s (803k iterations)
+Benchmarking branch_write/branches_64/32: Analyzing
+branch_write/branches_64/32
+                        time:   [2.4724 µs 2.4901 µs 2.5144 µs]
+                        thrpt:  [151.34 MiB/s 152.81 MiB/s 153.91 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  2 (4.00%) high mild
+  2 (4.00%) high severe
+Benchmarking branch_write/branches_64/64
+Benchmarking branch_write/branches_64/64: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/64: Collecting 50 samples in estimated 2.0001 s (306k iterations)
+Benchmarking branch_write/branches_64/64: Analyzing
+branch_write/branches_64/64
+                        time:   [6.4314 µs 6.4971 µs 6.5802 µs]
+                        thrpt:  [118.12 MiB/s 119.63 MiB/s 120.85 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  5 (10.00%) high mild
+  2 (4.00%) high severe
+Benchmarking branch_write/branches_64/128
+Benchmarking branch_write/branches_64/128: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/128: Collecting 50 samples in estimated 2.0000 s (152k iterations)
+Benchmarking branch_write/branches_64/128: Analyzing
+branch_write/branches_64/128
+                        time:   [13.225 µs 13.421 µs 13.656 µs]
+                        thrpt:  [115.58 MiB/s 117.60 MiB/s 119.34 MiB/s]
+Found 8 outliers among 50 measurements (16.00%)
+  2 (4.00%) high mild
+  6 (12.00%) high severe
+Benchmarking branch_write/branches_256/32
+Benchmarking branch_write/branches_256/32: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/32: Collecting 50 samples in estimated 2.0001 s (773k iterations)
+Benchmarking branch_write/branches_256/32: Analyzing
+branch_write/branches_256/32
+                        time:   [2.5853 µs 2.5999 µs 2.6199 µs]
+                        thrpt:  [145.24 MiB/s 146.36 MiB/s 147.18 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  2 (4.00%) high mild
+  2 (4.00%) high severe
+Benchmarking branch_write/branches_256/64
+Benchmarking branch_write/branches_256/64: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/64: Collecting 50 samples in estimated 2.0002 s (304k iterations)
+Benchmarking branch_write/branches_256/64: Analyzing
+branch_write/branches_256/64
+                        time:   [6.5385 µs 6.5649 µs 6.6016 µs]
+                        thrpt:  [117.74 MiB/s 118.39 MiB/s 118.87 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  2 (4.00%) high mild
+  1 (2.00%) high severe
+Benchmarking branch_write/branches_256/128
+Benchmarking branch_write/branches_256/128: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/128: Collecting 50 samples in estimated 2.0000 s (127k iterations)
+Benchmarking branch_write/branches_256/128: Analyzing
+branch_write/branches_256/128
+                        time:   [15.739 µs 16.010 µs 16.422 µs]
+                        thrpt:  [100.52 MiB/s 103.11 MiB/s 104.89 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  2 (4.00%) high mild
+  5 (10.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-refined/baseline-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-refined/baseline-1.txt
new file mode 100644
index 0000000..b3d62d3
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-refined/baseline-1.txt
@@ -0,0 +1,62 @@
+memcap: <=7707 MiB (60% of 12846 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_64/32
+Benchmarking branch_write/branches_64/32: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/32: Collecting 50 samples in estimated 2.0001 s (810k iterations)
+Benchmarking branch_write/branches_64/32: Analyzing
+branch_write/branches_64/32
+                        time:   [2.4805 µs 2.5135 µs 2.5541 µs]
+                        thrpt:  [148.98 MiB/s 151.39 MiB/s 153.40 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  3 (6.00%) high mild
+  4 (8.00%) high severe
+Benchmarking branch_write/branches_64/64
+Benchmarking branch_write/branches_64/64: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/64: Collecting 50 samples in estimated 2.0002 s (310k iterations)
+Benchmarking branch_write/branches_64/64: Analyzing
+branch_write/branches_64/64
+                        time:   [6.3913 µs 6.6176 µs 6.9585 µs]
+                        thrpt:  [111.70 MiB/s 117.45 MiB/s 121.61 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  2 (4.00%) high mild
+  3 (6.00%) high severe
+Benchmarking branch_write/branches_64/128
+Benchmarking branch_write/branches_64/128: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/128: Collecting 50 samples in estimated 2.0006 s (154k iterations)
+Benchmarking branch_write/branches_64/128: Analyzing
+branch_write/branches_64/128
+                        time:   [13.009 µs 13.174 µs 13.401 µs]
+                        thrpt:  [117.78 MiB/s 119.81 MiB/s 121.33 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  1 (2.00%) high mild
+  6 (12.00%) high severe
+Benchmarking branch_write/branches_256/32
+Benchmarking branch_write/branches_256/32: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/32: Collecting 50 samples in estimated 2.0001 s (779k iterations)
+Benchmarking branch_write/branches_256/32: Analyzing
+branch_write/branches_256/32
+                        time:   [2.5588 µs 2.5822 µs 2.6110 µs]
+                        thrpt:  [145.73 MiB/s 147.36 MiB/s 148.71 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  1 (2.00%) high mild
+  5 (10.00%) high severe
+Benchmarking branch_write/branches_256/64
+Benchmarking branch_write/branches_256/64: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/64: Collecting 50 samples in estimated 2.0002 s (299k iterations)
+Benchmarking branch_write/branches_256/64: Analyzing
+branch_write/branches_256/64
+                        time:   [6.4942 µs 6.5105 µs 6.5298 µs]
+                        thrpt:  [119.03 MiB/s 119.38 MiB/s 119.68 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  2 (4.00%) high mild
+  2 (4.00%) high severe
+Benchmarking branch_write/branches_256/128
+Benchmarking branch_write/branches_256/128: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/128: Collecting 50 samples in estimated 2.0005 s (127k iterations)
+Benchmarking branch_write/branches_256/128: Analyzing
+branch_write/branches_256/128
+                        time:   [15.642 µs 15.725 µs 15.832 µs]
+                        thrpt:  [104.27 MiB/s 104.98 MiB/s 105.54 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  2 (4.00%) high mild
+  3 (6.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-refined/baseline-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-refined/baseline-build.txt
new file mode 100644
index 0000000..6ebb1ed
--- /dev/null
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@@ -0,0 +1,3 @@
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+    Finished `bench` profile [optimized] target(s) in 2.74s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-refined/baseline.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-refined/baseline.lock
new file mode 100644
index 0000000..78a11b2
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-refined/criterion-SHA256SUMS b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-refined/criterion-SHA256SUMS
new file mode 100644
index 0000000..8b35a36
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-refined/criterion-SHA256SUMS
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-refined/criterion-results.tar.gz b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-refined/criterion-results.tar.gz
new file mode 100644
index 0000000..bbfb1b5
Binary files /dev/null and b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-refined/criterion-results.tar.gz differ
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-refined/current-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-refined/current-0.txt
new file mode 100644
index 0000000..f136c6a
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-refined/current-0.txt
@@ -0,0 +1,60 @@
+memcap: <=7700 MiB (60% of 12834 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_64/32
+Benchmarking branch_write/branches_64/32: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/32: Collecting 50 samples in estimated 2.0000 s (825k iterations)
+Benchmarking branch_write/branches_64/32: Analyzing
+branch_write/branches_64/32
+                        time:   [2.3740 µs 2.4058 µs 2.4489 µs]
+                        thrpt:  [155.38 MiB/s 158.17 MiB/s 160.28 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  2 (4.00%) high mild
+  4 (8.00%) high severe
+Benchmarking branch_write/branches_64/64
+Benchmarking branch_write/branches_64/64: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/64: Collecting 50 samples in estimated 2.0002 s (357k iterations)
+Benchmarking branch_write/branches_64/64: Analyzing
+branch_write/branches_64/64
+                        time:   [5.5052 µs 5.5222 µs 5.5411 µs]
+                        thrpt:  [140.27 MiB/s 140.75 MiB/s 141.18 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  3 (6.00%) high mild
+Benchmarking branch_write/branches_64/128
+Benchmarking branch_write/branches_64/128: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/128: Collecting 50 samples in estimated 2.0004 s (193k iterations)
+Benchmarking branch_write/branches_64/128: Analyzing
+branch_write/branches_64/128
+                        time:   [10.228 µs 10.269 µs 10.318 µs]
+                        thrpt:  [152.97 MiB/s 153.70 MiB/s 154.31 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  3 (6.00%) high mild
+  2 (4.00%) high severe
+Benchmarking branch_write/branches_256/32
+Benchmarking branch_write/branches_256/32: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/32: Collecting 50 samples in estimated 2.0001 s (786k iterations)
+Benchmarking branch_write/branches_256/32: Analyzing
+branch_write/branches_256/32
+                        time:   [2.4941 µs 2.5197 µs 2.5503 µs]
+                        thrpt:  [149.20 MiB/s 151.02 MiB/s 152.57 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  3 (6.00%) high mild
+  4 (8.00%) high severe
+Benchmarking branch_write/branches_256/64
+Benchmarking branch_write/branches_256/64: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/64: Collecting 50 samples in estimated 2.0001 s (314k iterations)
+Benchmarking branch_write/branches_256/64: Analyzing
+branch_write/branches_256/64
+                        time:   [6.2744 µs 6.3054 µs 6.3436 µs]
+                        thrpt:  [122.52 MiB/s 123.27 MiB/s 123.88 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  3 (6.00%) high mild
+  1 (2.00%) high severe
+Benchmarking branch_write/branches_256/128
+Benchmarking branch_write/branches_256/128: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/128: Collecting 50 samples in estimated 2.0005 s (153k iterations)
+Benchmarking branch_write/branches_256/128: Analyzing
+branch_write/branches_256/128
+                        time:   [12.980 µs 13.104 µs 13.253 µs]
+                        thrpt:  [124.56 MiB/s 125.98 MiB/s 127.18 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  7 (14.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-refined/current-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-refined/current-1.txt
new file mode 100644
index 0000000..d07191f
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-refined/current-1.txt
@@ -0,0 +1,62 @@
+memcap: <=7705 MiB (60% of 12842 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_64/32
+Benchmarking branch_write/branches_64/32: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/32: Collecting 50 samples in estimated 2.0001 s (816k iterations)
+Benchmarking branch_write/branches_64/32: Analyzing
+branch_write/branches_64/32
+                        time:   [2.3837 µs 2.3988 µs 2.4167 µs]
+                        thrpt:  [157.45 MiB/s 158.62 MiB/s 159.63 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  2 (4.00%) high mild
+  2 (4.00%) high severe
+Benchmarking branch_write/branches_64/64
+Benchmarking branch_write/branches_64/64: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/64: Collecting 50 samples in estimated 2.0003 s (350k iterations)
+Benchmarking branch_write/branches_64/64: Analyzing
+branch_write/branches_64/64
+                        time:   [5.6490 µs 5.7065 µs 5.7729 µs]
+                        thrpt:  [134.64 MiB/s 136.20 MiB/s 137.59 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  3 (6.00%) high mild
+  4 (8.00%) high severe
+Benchmarking branch_write/branches_64/128
+Benchmarking branch_write/branches_64/128: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/128: Collecting 50 samples in estimated 2.0001 s (188k iterations)
+Benchmarking branch_write/branches_64/128: Analyzing
+branch_write/branches_64/128
+                        time:   [10.372 µs 10.426 µs 10.491 µs]
+                        thrpt:  [150.44 MiB/s 151.38 MiB/s 152.18 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  2 (4.00%) high mild
+  3 (6.00%) high severe
+Benchmarking branch_write/branches_256/32
+Benchmarking branch_write/branches_256/32: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/32: Collecting 50 samples in estimated 2.0000 s (784k iterations)
+Benchmarking branch_write/branches_256/32: Analyzing
+branch_write/branches_256/32
+                        time:   [2.5006 µs 2.5274 µs 2.5653 µs]
+                        thrpt:  [148.33 MiB/s 150.56 MiB/s 152.17 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  1 (2.00%) high mild
+  3 (6.00%) high severe
+Benchmarking branch_write/branches_256/64
+Benchmarking branch_write/branches_256/64: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/64: Collecting 50 samples in estimated 2.0003 s (299k iterations)
+Benchmarking branch_write/branches_256/64: Analyzing
+branch_write/branches_256/64
+                        time:   [6.4193 µs 6.4854 µs 6.5667 µs]
+                        thrpt:  [118.36 MiB/s 119.84 MiB/s 121.08 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  1 (2.00%) high mild
+  6 (12.00%) high severe
+Benchmarking branch_write/branches_256/128
+Benchmarking branch_write/branches_256/128: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/128: Collecting 50 samples in estimated 2.0001 s (150k iterations)
+Benchmarking branch_write/branches_256/128: Analyzing
+branch_write/branches_256/128
+                        time:   [13.101 µs 13.168 µs 13.254 µs]
+                        thrpt:  [124.55 MiB/s 125.37 MiB/s 126.01 MiB/s]
+Found 2 outliers among 50 measurements (4.00%)
+  1 (2.00%) high mild
+  1 (2.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-refined/current-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-refined/current-build.txt
new file mode 100644
index 0000000..d541f06
--- /dev/null
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@@ -0,0 +1,4 @@
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+   Compiling core-regression v0.0.0 (/home/bailey/github/polyxml-mixed-index/benchmarks/rust-xml-regression/target/core-current)
+    Finished `bench` profile [optimized] target(s) in 26.95s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-refined/current.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-refined/current.lock
new file mode 100644
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-refined/harness.rs b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-refined/harness.rs
new file mode 100644
index 0000000..3fa0c28
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-refined/harness.rs
@@ -0,0 +1,77 @@
+use criterion::{
+    criterion_group, criterion_main, BenchmarkId, Criterion, SamplingMode, Throughput,
+};
+use polyxml::schema::ModelSchema;
+use polyxml::schema_parser::XsdParser;
+use polyxml::{deserialize, serialize, PolyValue};
+use std::{hint::black_box, sync::Arc};
+
+fn fixture(branches: usize, count: usize) -> (Arc<ModelSchema>, Vec<u8>) {
+    let declarations = (0..branches)
+        .map(|i| format!(r#"<xs:element name="B{i}" type="xs:int"/>"#))
+        .collect::<String>();
+    let xsd = format!(
+        r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"><xs:element name="Root"><xs:complexType mixed="true"><xs:choice minOccurs="0" maxOccurs="unbounded">{declarations}</xs:choice></xs:complexType></xs:element></xs:schema>"#
+    );
+    let ir = XsdParser::new().parse_str(&xsd).unwrap();
+    let schema = ModelSchema::from_ir(&ir, Some("Root")).unwrap();
+    let body = (0..count)
+        .map(|i| format!("<B{}>{i}</B{}>", i % branches, i % branches))
+        .collect::<String>();
+    let xml = format!("<Root>{body}</Root>").into_bytes();
+    let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+    let mixed = schema.mixed_content.as_ref().unwrap();
+    let field = &schema.fields[mixed.items_index].name;
+    let items = value.get(field).and_then(PolyValue::as_list).unwrap();
+    assert_eq!(items.len(), count);
+    for (i, item) in items.iter().enumerate() {
+        assert_eq!(item.get("value"), Some(&PolyValue::Int(i as i64)));
+        let kind = item.get("kind").and_then(PolyValue::as_str).unwrap();
+        let branch = mixed
+            .branches
+            .iter()
+            .find(|b| b.variant_name == kind)
+            .unwrap();
+        assert_eq!(branch.xml_name, format!("B{}", i % branches).as_bytes());
+    }
+    let output = serialize("Root", &value, &schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+    let output = serialize("Sensor", &value, &schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    (schema, xml)
+}
+
+fn benchmarks(c: &mut Criterion) {
+    for operation in ["branch_read", "branch_write"] {
+        let mut group = c.benchmark_group(operation);
+        group.sampling_mode(SamplingMode::Flat);
+        for branches in [64, 256] {
+            for count in [32, 64, 128] {
+                let (schema, xml) = fixture(branches, count);
+                let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+                group.throughput(Throughput::Bytes(xml.len() as u64));
+                group.bench_with_input(
+                    BenchmarkId::new(format!("branches_{branches}"), count),
+                    &count,
+                    |b, _| {
+                        b.iter(|| {
+                            if operation == "branch_read" {
+                                black_box(
+                                    deserialize(black_box(&xml), Arc::clone(&schema)).unwrap(),
+                                );
+                            } else {
+                                black_box(
+                                    serialize("Root", black_box(&value), &schema, None).unwrap(),
+                                );
+                            }
+                        });
+                    },
+                );
+            }
+        }
+        group.finish();
+    }
+}
+criterion_group!(benches, benchmarks);
+criterion_main!(benches);
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-refined/metadata.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-refined/metadata.json
new file mode 100644
index 0000000..26d8361
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-refined/metadata.json
@@ -0,0 +1,19 @@
+{
+  "revisions": {
+    "baseline": "1819c91b0808b9242c642d82350d2b657b60108c",
+    "current": "ba6fd98d252fd736d9ecc9a78c3f372b75f4b118"
+  },
+  "core_status": {
+    "baseline": "",
+    "current": ""
+  },
+  "sample_size": 50,
+  "warmup_seconds": 1.0,
+  "measurement_seconds": 2.0,
+  "rounds": 2,
+  "filter": "^branch_write/",
+  "order": "alternate baseline/current per round",
+  "os": "Linux-6.18.40.1-microsoft-standard-WSL2-x86_64-with-glibc2.43",
+  "cpu": "11th Gen Intel(R) Core(TM) i5-11600K @ 3.90GHz",
+  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)\nbinary: rustc\ncommit-hash: b940084d7eb6a299eb4bfeb8e34901bc051e7ac4\ncommit-date: 2026-09-28\nhost: x86_64-unknown-linux-gnu\nrelease: 1.99.0\nLLVM version: 23.1.1\n"
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-refined/summary.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-refined/summary.json
new file mode 100644
index 0000000..188a539
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-refined/summary.json
@@ -0,0 +1,314 @@
+{
+  "branch_write/branches_256/128": {
+    "baseline_ns": 15867.884673482338,
+    "candidate_ns": 13135.893848083226,
+    "delta_percent": -17.21710789822343,
+    "speedup": 1.207979057762998,
+    "process_deltas_percent": [
+      -18.15290488355711,
+      -16.26435900472182
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 15738.674938239936,
+            "upper_bound": 16422.179065509074
+          },
+          "point_estimate": 16010.317498026832,
+          "standard_error": 180.85675239967614
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 15642.039494885921,
+            "upper_bound": 15831.901476199842
+          },
+          "point_estimate": 15725.451848937846,
+          "standard_error": 48.779344750720455
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 12980.285304276855,
+            "upper_bound": 13253.243681194903
+          },
+          "point_estimate": 13103.97979105452,
+          "standard_error": 69.86601627922683
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 13100.53071984631,
+            "upper_bound": 13254.245567991982
+          },
+          "point_estimate": 13167.80790511193,
+          "standard_error": 39.47796469348118
+        }
+      ]
+    }
+  },
+  "branch_write/branches_256/32": {
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+    "candidate_ns": 2523.5451174347945,
+    "delta_percent": -2.605799749976201,
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+    "process_deltas_percent": [
+      -3.0856702119146484,
+      -2.122627935357224
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+            "upper_bound": 6958.476734080284
+          },
+          "point_estimate": 6617.631810414315,
+          "standard_error": 149.6389491666908
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 5505.165918253079,
+            "upper_bound": 5541.133275055991
+          },
+          "point_estimate": 5522.2022956327,
+          "standard_error": 9.20634634315535
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 5649.015111373388,
+            "upper_bound": 5772.870846995707
+          },
+          "point_estimate": 5706.46086981402,
+          "standard_error": 31.789192496000474
+        }
+      ]
+    }
+  }
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-sampled/baseline-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-sampled/baseline-0.txt
new file mode 100644
index 0000000..4a4e6ce
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-sampled/baseline-0.txt
@@ -0,0 +1,62 @@
+memcap: <=7612 MiB (60% of 12687 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_64/32
+Benchmarking branch_write/branches_64/32: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/32: Collecting 50 samples in estimated 2.0001 s (814k iterations)
+Benchmarking branch_write/branches_64/32: Analyzing
+branch_write/branches_64/32
+                        time:   [2.4849 µs 2.5132 µs 2.5456 µs]
+                        thrpt:  [149.48 MiB/s 151.40 MiB/s 153.13 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  2 (4.00%) high mild
+  5 (10.00%) high severe
+Benchmarking branch_write/branches_64/64
+Benchmarking branch_write/branches_64/64: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/64: Collecting 50 samples in estimated 2.0001 s (313k iterations)
+Benchmarking branch_write/branches_64/64: Analyzing
+branch_write/branches_64/64
+                        time:   [6.4256 µs 6.4866 µs 6.5575 µs]
+                        thrpt:  [118.53 MiB/s 119.82 MiB/s 120.96 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  4 (8.00%) high mild
+  3 (6.00%) high severe
+Benchmarking branch_write/branches_64/128
+Benchmarking branch_write/branches_64/128: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/128: Collecting 50 samples in estimated 2.0003 s (154k iterations)
+Benchmarking branch_write/branches_64/128: Analyzing
+branch_write/branches_64/128
+                        time:   [13.028 µs 13.105 µs 13.193 µs]
+                        thrpt:  [119.63 MiB/s 120.44 MiB/s 121.15 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  4 (8.00%) high mild
+  1 (2.00%) high severe
+Benchmarking branch_write/branches_256/32
+Benchmarking branch_write/branches_256/32: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/32: Collecting 50 samples in estimated 2.0001 s (776k iterations)
+Benchmarking branch_write/branches_256/32: Analyzing
+branch_write/branches_256/32
+                        time:   [2.5750 µs 2.5901 µs 2.6089 µs]
+                        thrpt:  [145.85 MiB/s 146.91 MiB/s 147.78 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  2 (4.00%) high mild
+  2 (4.00%) high severe
+Benchmarking branch_write/branches_256/64
+Benchmarking branch_write/branches_256/64: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/64: Collecting 50 samples in estimated 2.0000 s (303k iterations)
+Benchmarking branch_write/branches_256/64: Analyzing
+branch_write/branches_256/64
+                        time:   [6.5367 µs 6.5687 µs 6.6143 µs]
+                        thrpt:  [117.51 MiB/s 118.33 MiB/s 118.90 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  3 (6.00%) high mild
+  1 (2.00%) high severe
+Benchmarking branch_write/branches_256/128
+Benchmarking branch_write/branches_256/128: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/128: Collecting 50 samples in estimated 2.0005 s (126k iterations)
+Benchmarking branch_write/branches_256/128: Analyzing
+branch_write/branches_256/128
+                        time:   [15.750 µs 15.807 µs 15.880 µs]
+                        thrpt:  [103.96 MiB/s 104.44 MiB/s 104.82 MiB/s]
+Found 2 outliers among 50 measurements (4.00%)
+  1 (2.00%) high mild
+  1 (2.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-sampled/baseline-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-sampled/baseline-1.txt
new file mode 100644
index 0000000..df20e26
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-sampled/baseline-1.txt
@@ -0,0 +1,61 @@
+memcap: <=7701 MiB (60% of 12835 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_64/32
+Benchmarking branch_write/branches_64/32: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/32: Collecting 50 samples in estimated 2.0000 s (812k iterations)
+Benchmarking branch_write/branches_64/32: Analyzing
+branch_write/branches_64/32
+                        time:   [2.4514 µs 2.4754 µs 2.5050 µs]
+                        thrpt:  [151.90 MiB/s 153.72 MiB/s 155.23 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  4 (8.00%) high mild
+  3 (6.00%) high severe
+Benchmarking branch_write/branches_64/64
+Benchmarking branch_write/branches_64/64: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/64: Collecting 50 samples in estimated 2.0002 s (312k iterations)
+Benchmarking branch_write/branches_64/64: Analyzing
+branch_write/branches_64/64
+                        time:   [6.3637 µs 6.4361 µs 6.5314 µs]
+                        thrpt:  [119.00 MiB/s 120.76 MiB/s 122.14 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  1 (2.00%) high mild
+  4 (8.00%) high severe
+Benchmarking branch_write/branches_64/128
+Benchmarking branch_write/branches_64/128: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/128: Collecting 50 samples in estimated 2.0005 s (154k iterations)
+Benchmarking branch_write/branches_64/128: Analyzing
+branch_write/branches_64/128
+                        time:   [12.884 µs 12.940 µs 13.022 µs]
+                        thrpt:  [121.21 MiB/s 121.97 MiB/s 122.50 MiB/s]
+Found 2 outliers among 50 measurements (4.00%)
+  2 (4.00%) high severe
+Benchmarking branch_write/branches_256/32
+Benchmarking branch_write/branches_256/32: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/32: Collecting 50 samples in estimated 2.0001 s (785k iterations)
+Benchmarking branch_write/branches_256/32: Analyzing
+branch_write/branches_256/32
+                        time:   [2.5467 µs 2.5640 µs 2.5870 µs]
+                        thrpt:  [147.09 MiB/s 148.41 MiB/s 149.42 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  2 (4.00%) high mild
+  4 (8.00%) high severe
+Benchmarking branch_write/branches_256/64
+Benchmarking branch_write/branches_256/64: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/64: Collecting 50 samples in estimated 2.0003 s (308k iterations)
+Benchmarking branch_write/branches_256/64: Analyzing
+branch_write/branches_256/64
+                        time:   [6.5027 µs 6.5348 µs 6.5762 µs]
+                        thrpt:  [118.19 MiB/s 118.94 MiB/s 119.53 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  2 (4.00%) high mild
+  2 (4.00%) high severe
+Benchmarking branch_write/branches_256/128
+Benchmarking branch_write/branches_256/128: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/128: Collecting 50 samples in estimated 2.0002 s (126k iterations)
+Benchmarking branch_write/branches_256/128: Analyzing
+branch_write/branches_256/128
+                        time:   [15.780 µs 15.855 µs 15.947 µs]
+                        thrpt:  [103.52 MiB/s 104.12 MiB/s 104.62 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  3 (6.00%) high mild
+  3 (6.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-sampled/baseline-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-sampled/baseline-build.txt
new file mode 100644
index 0000000..b5a47f7
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-sampled/baseline-build.txt
@@ -0,0 +1,3 @@
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+    Finished `bench` profile [optimized] target(s) in 2.74s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-sampled/baseline.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-sampled/baseline.lock
new file mode 100644
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-sampled/criterion-SHA256SUMS b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-sampled/criterion-SHA256SUMS
new file mode 100644
index 0000000..67e9091
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-sampled/criterion-SHA256SUMS
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-sampled/criterion-results.tar.gz b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-sampled/criterion-results.tar.gz
new file mode 100644
index 0000000..1d3dff6
Binary files /dev/null and b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-sampled/criterion-results.tar.gz differ
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-sampled/current-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-sampled/current-0.txt
new file mode 100644
index 0000000..83aee1d
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-sampled/current-0.txt
@@ -0,0 +1,60 @@
+memcap: <=7700 MiB (60% of 12833 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_64/32
+Benchmarking branch_write/branches_64/32: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/32: Collecting 50 samples in estimated 2.0000 s (854k iterations)
+Benchmarking branch_write/branches_64/32: Analyzing
+branch_write/branches_64/32
+                        time:   [2.3269 µs 2.3487 µs 2.3773 µs]
+                        thrpt:  [160.06 MiB/s 162.01 MiB/s 163.53 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  1 (2.00%) high mild
+  3 (6.00%) high severe
+Benchmarking branch_write/branches_64/64
+Benchmarking branch_write/branches_64/64: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/64: Collecting 50 samples in estimated 2.0001 s (313k iterations)
+Benchmarking branch_write/branches_64/64: Analyzing
+branch_write/branches_64/64
+                        time:   [6.3925 µs 6.4800 µs 6.5973 µs]
+                        thrpt:  [117.81 MiB/s 119.94 MiB/s 121.59 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  4 (8.00%) high severe
+Benchmarking branch_write/branches_64/128
+Benchmarking branch_write/branches_64/128: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/128: Collecting 50 samples in estimated 2.0004 s (180k iterations)
+Benchmarking branch_write/branches_64/128: Analyzing
+branch_write/branches_64/128
+                        time:   [11.120 µs 11.164 µs 11.221 µs]
+                        thrpt:  [140.65 MiB/s 141.38 MiB/s 141.93 MiB/s]
+Found 2 outliers among 50 measurements (4.00%)
+  1 (2.00%) high mild
+  1 (2.00%) high severe
+Benchmarking branch_write/branches_256/32
+Benchmarking branch_write/branches_256/32: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/32: Collecting 50 samples in estimated 2.0000 s (819k iterations)
+Benchmarking branch_write/branches_256/32: Analyzing
+branch_write/branches_256/32
+                        time:   [2.4285 µs 2.4387 µs 2.4528 µs]
+                        thrpt:  [155.14 MiB/s 156.03 MiB/s 156.68 MiB/s]
+Found 2 outliers among 50 measurements (4.00%)
+  1 (2.00%) high mild
+  1 (2.00%) high severe
+Benchmarking branch_write/branches_256/64
+Benchmarking branch_write/branches_256/64: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/64: Collecting 50 samples in estimated 2.0002 s (314k iterations)
+Benchmarking branch_write/branches_256/64: Analyzing
+branch_write/branches_256/64
+                        time:   [6.2935 µs 6.3163 µs 6.3423 µs]
+                        thrpt:  [122.55 MiB/s 123.05 MiB/s 123.50 MiB/s]
+Found 2 outliers among 50 measurements (4.00%)
+  1 (2.00%) high mild
+  1 (2.00%) high severe
+Benchmarking branch_write/branches_256/128
+Benchmarking branch_write/branches_256/128: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/128: Collecting 50 samples in estimated 2.0003 s (139k iterations)
+Benchmarking branch_write/branches_256/128: Analyzing
+branch_write/branches_256/128
+                        time:   [14.518 µs 14.612 µs 14.714 µs]
+                        thrpt:  [112.19 MiB/s 112.98 MiB/s 113.71 MiB/s]
+Found 1 outliers among 50 measurements (2.00%)
+  1 (2.00%) high mild
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-sampled/current-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-sampled/current-1.txt
new file mode 100644
index 0000000..36facc0
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-sampled/current-1.txt
@@ -0,0 +1,60 @@
+memcap: <=7700 MiB (60% of 12833 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_64/32
+Benchmarking branch_write/branches_64/32: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/32: Collecting 50 samples in estimated 2.0000 s (836k iterations)
+Benchmarking branch_write/branches_64/32: Analyzing
+branch_write/branches_64/32
+                        time:   [2.3587 µs 2.3713 µs 2.3872 µs]
+                        thrpt:  [159.40 MiB/s 160.46 MiB/s 161.32 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  3 (6.00%) high mild
+  2 (4.00%) high severe
+Benchmarking branch_write/branches_64/64
+Benchmarking branch_write/branches_64/64: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/64: Collecting 50 samples in estimated 2.0001 s (311k iterations)
+Benchmarking branch_write/branches_64/64: Analyzing
+branch_write/branches_64/64
+                        time:   [6.4291 µs 6.4934 µs 6.5699 µs]
+                        thrpt:  [118.30 MiB/s 119.70 MiB/s 120.89 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  2 (4.00%) high mild
+  4 (8.00%) high severe
+Benchmarking branch_write/branches_64/128
+Benchmarking branch_write/branches_64/128: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/128: Collecting 50 samples in estimated 2.0003 s (181k iterations)
+Benchmarking branch_write/branches_64/128: Analyzing
+branch_write/branches_64/128
+                        time:   [11.025 µs 11.079 µs 11.152 µs]
+                        thrpt:  [141.53 MiB/s 142.46 MiB/s 143.16 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  3 (6.00%) high severe
+Benchmarking branch_write/branches_256/32
+Benchmarking branch_write/branches_256/32: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/32: Collecting 50 samples in estimated 2.0000 s (808k iterations)
+Benchmarking branch_write/branches_256/32: Analyzing
+branch_write/branches_256/32
+                        time:   [2.4638 µs 2.4822 µs 2.5050 µs]
+                        thrpt:  [151.90 MiB/s 153.30 MiB/s 154.44 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  5 (10.00%) high severe
+Benchmarking branch_write/branches_256/64
+Benchmarking branch_write/branches_256/64: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/64: Collecting 50 samples in estimated 2.0002 s (313k iterations)
+Benchmarking branch_write/branches_256/64: Analyzing
+branch_write/branches_256/64
+                        time:   [6.2984 µs 6.3363 µs 6.3863 µs]
+                        thrpt:  [121.71 MiB/s 122.67 MiB/s 123.40 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  2 (4.00%) high mild
+  3 (6.00%) high severe
+Benchmarking branch_write/branches_256/128
+Benchmarking branch_write/branches_256/128: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/128: Collecting 50 samples in estimated 2.0001 s (135k iterations)
+Benchmarking branch_write/branches_256/128: Analyzing
+branch_write/branches_256/128
+                        time:   [14.428 µs 14.480 µs 14.545 µs]
+                        thrpt:  [113.50 MiB/s 114.01 MiB/s 114.42 MiB/s]
+Found 2 outliers among 50 measurements (4.00%)
+  1 (2.00%) high mild
+  1 (2.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-sampled/current-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-sampled/current-build.txt
new file mode 100644
index 0000000..bba1c93
--- /dev/null
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+    Finished `bench` profile [optimized] target(s) in 2.73s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-sampled/current.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-sampled/current.lock
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-sampled/harness.rs b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-sampled/harness.rs
new file mode 100644
index 0000000..3fa0c28
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-sampled/harness.rs
@@ -0,0 +1,77 @@
+use criterion::{
+    criterion_group, criterion_main, BenchmarkId, Criterion, SamplingMode, Throughput,
+};
+use polyxml::schema::ModelSchema;
+use polyxml::schema_parser::XsdParser;
+use polyxml::{deserialize, serialize, PolyValue};
+use std::{hint::black_box, sync::Arc};
+
+fn fixture(branches: usize, count: usize) -> (Arc<ModelSchema>, Vec<u8>) {
+    let declarations = (0..branches)
+        .map(|i| format!(r#"<xs:element name="B{i}" type="xs:int"/>"#))
+        .collect::<String>();
+    let xsd = format!(
+        r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"><xs:element name="Root"><xs:complexType mixed="true"><xs:choice minOccurs="0" maxOccurs="unbounded">{declarations}</xs:choice></xs:complexType></xs:element></xs:schema>"#
+    );
+    let ir = XsdParser::new().parse_str(&xsd).unwrap();
+    let schema = ModelSchema::from_ir(&ir, Some("Root")).unwrap();
+    let body = (0..count)
+        .map(|i| format!("<B{}>{i}</B{}>", i % branches, i % branches))
+        .collect::<String>();
+    let xml = format!("<Root>{body}</Root>").into_bytes();
+    let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+    let mixed = schema.mixed_content.as_ref().unwrap();
+    let field = &schema.fields[mixed.items_index].name;
+    let items = value.get(field).and_then(PolyValue::as_list).unwrap();
+    assert_eq!(items.len(), count);
+    for (i, item) in items.iter().enumerate() {
+        assert_eq!(item.get("value"), Some(&PolyValue::Int(i as i64)));
+        let kind = item.get("kind").and_then(PolyValue::as_str).unwrap();
+        let branch = mixed
+            .branches
+            .iter()
+            .find(|b| b.variant_name == kind)
+            .unwrap();
+        assert_eq!(branch.xml_name, format!("B{}", i % branches).as_bytes());
+    }
+    let output = serialize("Root", &value, &schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+    let output = serialize("Sensor", &value, &schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    (schema, xml)
+}
+
+fn benchmarks(c: &mut Criterion) {
+    for operation in ["branch_read", "branch_write"] {
+        let mut group = c.benchmark_group(operation);
+        group.sampling_mode(SamplingMode::Flat);
+        for branches in [64, 256] {
+            for count in [32, 64, 128] {
+                let (schema, xml) = fixture(branches, count);
+                let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+                group.throughput(Throughput::Bytes(xml.len() as u64));
+                group.bench_with_input(
+                    BenchmarkId::new(format!("branches_{branches}"), count),
+                    &count,
+                    |b, _| {
+                        b.iter(|| {
+                            if operation == "branch_read" {
+                                black_box(
+                                    deserialize(black_box(&xml), Arc::clone(&schema)).unwrap(),
+                                );
+                            } else {
+                                black_box(
+                                    serialize("Root", black_box(&value), &schema, None).unwrap(),
+                                );
+                            }
+                        });
+                    },
+                );
+            }
+        }
+        group.finish();
+    }
+}
+criterion_group!(benches, benchmarks);
+criterion_main!(benches);
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-sampled/metadata.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-sampled/metadata.json
new file mode 100644
index 0000000..bb748c9
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-sampled/metadata.json
@@ -0,0 +1,19 @@
+{
+  "revisions": {
+    "baseline": "1819c91b0808b9242c642d82350d2b657b60108c",
+    "current": "58cb346f964b5196dfad62e8a62a8aa4beb9beef"
+  },
+  "core_status": {
+    "baseline": "",
+    "current": ""
+  },
+  "sample_size": 50,
+  "warmup_seconds": 1.0,
+  "measurement_seconds": 2.0,
+  "rounds": 2,
+  "filter": "^branch_write/",
+  "order": "alternate baseline/current per round",
+  "os": "Linux-6.18.40.1-microsoft-standard-WSL2-x86_64-with-glibc2.43",
+  "cpu": "11th Gen Intel(R) Core(TM) i5-11600K @ 3.90GHz",
+  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)\nbinary: rustc\ncommit-hash: b940084d7eb6a299eb4bfeb8e34901bc051e7ac4\ncommit-date: 2026-09-28\nhost: x86_64-unknown-linux-gnu\nrelease: 1.99.0\nLLVM version: 23.1.1\n"
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-sampled/summary.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-sampled/summary.json
new file mode 100644
index 0000000..4e0073a
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover-sampled/summary.json
@@ -0,0 +1,314 @@
+{
+  "branch_write/branches_256/128": {
+    "baseline_ns": 15830.516837784577,
+    "candidate_ns": 14545.67176658786,
+    "delta_percent": -8.116254727262117,
+    "speedup": 1.088331779502138,
+    "process_deltas_percent": [
+      -7.5599032435039515,
+      -8.67092177684361
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 15749.541563564362,
+            "upper_bound": 15879.958903564362
+          },
+          "point_estimate": 15806.515920792088,
+          "standard_error": 33.499232335535666
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 15779.606307921971,
+            "upper_bound": 15946.899180334398
+          },
+          "point_estimate": 15854.517754777065,
+          "standard_error": 43.082964208124935
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 14517.572364879456,
+            "upper_bound": 14714.084016912557
+          },
+          "point_estimate": 14611.558611011158,
+          "standard_error": 50.29858598353853
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 14427.873701445513,
+            "upper_bound": 14544.879892327646
+          },
+          "point_estimate": 14479.784922164565,
+          "standard_error": 30.039966867027683
+        }
+      ]
+    }
+  },
+  "branch_write/branches_256/32": {
+    "baseline_ns": 2577.0538964988664,
+    "candidate_ns": 2460.4573583638585,
+    "delta_percent": -4.524412092948992,
+    "speedup": 1.0473881564086693,
+    "process_deltas_percent": [
+      -5.8471343722126035,
+      -3.1882082849632454
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 2574.964507477118,
+            "upper_bound": 2608.9400937217993
+          },
+          "point_estimate": 2590.1203093979625,
+          "standard_error": 8.723715444290745
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 2546.6536430163687,
+            "upper_bound": 2586.9862317686766
+          },
+          "point_estimate": 2563.9874835997703,
+          "standard_error": 10.413454489175402
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 2428.549479426129,
+            "upper_bound": 2452.7960906593407
+          },
+          "point_estimate": 2438.672494505495,
+          "standard_error": 6.2744031578869315
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 2463.782807906459,
+            "upper_bound": 2504.979358791141
+          },
+          "point_estimate": 2482.2422222222217,
+          "standard_error": 10.553768387628836
+        }
+      ]
+    }
+  },
+  "branch_write/branches_256/64": {
+    "baseline_ns": 6551.736383159103,
+    "candidate_ns": 6326.296993264353,
+    "delta_percent": -3.4409105725656253,
+    "speedup": 1.0356352839796767,
+    "process_deltas_percent": [
+      -3.8422710826037654,
+      -3.0374655351065982
+    ],
+    "process_estimates": {
+      "baseline": [
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+          "confidence_interval": {
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+            "lower_bound": 6536.724317589846,
+            "upper_bound": 6614.276257335973
+          },
+          "point_estimate": 6568.706040224201,
+          "standard_error": 20.116088393794442
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 6502.664952512156,
+            "upper_bound": 6576.186159805511
+          },
+          "point_estimate": 6534.766726094004,
+          "standard_error": 18.944767992655784
+        }
+      ],
+      "current": [
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+            "lower_bound": 6293.475688246536,
+            "upper_bound": 6342.322651536871
+          },
+          "point_estimate": 6316.31854753942,
+          "standard_error": 12.480019302444164
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 6298.377755157524,
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover/baseline-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover/baseline-0.txt
new file mode 100644
index 0000000..7889b39
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover/baseline-0.txt
@@ -0,0 +1,58 @@
+memcap: <=7639 MiB (60% of 12732 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_64/32
+Benchmarking branch_write/branches_64/32: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/32: Collecting 50 samples in estimated 2.0000 s (800k iterations)
+Benchmarking branch_write/branches_64/32: Analyzing
+branch_write/branches_64/32
+                        time:   [2.4626 µs 2.4784 µs 2.4969 µs]
+                        thrpt:  [152.39 MiB/s 153.53 MiB/s 154.52 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  5 (10.00%) high severe
+Benchmarking branch_write/branches_64/64
+Benchmarking branch_write/branches_64/64: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/64: Collecting 50 samples in estimated 2.0001 s (309k iterations)
+Benchmarking branch_write/branches_64/64: Analyzing
+branch_write/branches_64/64
+                        time:   [6.4512 µs 6.5163 µs 6.5955 µs]
+                        thrpt:  [117.85 MiB/s 119.28 MiB/s 120.48 MiB/s]
+Found 8 outliers among 50 measurements (16.00%)
+  8 (16.00%) high severe
+Benchmarking branch_write/branches_64/128
+Benchmarking branch_write/branches_64/128: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/128: Collecting 50 samples in estimated 2.0006 s (154k iterations)
+Benchmarking branch_write/branches_64/128: Analyzing
+branch_write/branches_64/128
+                        time:   [13.044 µs 13.171 µs 13.325 µs]
+                        thrpt:  [118.45 MiB/s 119.84 MiB/s 121.00 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  5 (10.00%) high severe
+Benchmarking branch_write/branches_256/32
+Benchmarking branch_write/branches_256/32: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/32: Collecting 50 samples in estimated 2.0000 s (744k iterations)
+Benchmarking branch_write/branches_256/32: Analyzing
+branch_write/branches_256/32
+                        time:   [2.5760 µs 2.5890 µs 2.6049 µs]
+                        thrpt:  [146.08 MiB/s 146.97 MiB/s 147.71 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  1 (2.00%) high mild
+  3 (6.00%) high severe
+Benchmarking branch_write/branches_256/64
+Benchmarking branch_write/branches_256/64: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/64: Collecting 50 samples in estimated 2.0001 s (303k iterations)
+Benchmarking branch_write/branches_256/64: Analyzing
+branch_write/branches_256/64
+                        time:   [6.5142 µs 6.5312 µs 6.5495 µs]
+                        thrpt:  [118.67 MiB/s 119.00 MiB/s 119.31 MiB/s]
+Found 1 outliers among 50 measurements (2.00%)
+  1 (2.00%) high mild
+Benchmarking branch_write/branches_256/128
+Benchmarking branch_write/branches_256/128: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/128: Collecting 50 samples in estimated 2.0004 s (127k iterations)
+Benchmarking branch_write/branches_256/128: Analyzing
+branch_write/branches_256/128
+                        time:   [15.598 µs 15.660 µs 15.737 µs]
+                        thrpt:  [104.90 MiB/s 105.41 MiB/s 105.84 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  1 (2.00%) high mild
+  2 (4.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover/baseline-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover/baseline-1.txt
new file mode 100644
index 0000000..76c4003
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover/baseline-1.txt
@@ -0,0 +1,61 @@
+memcap: <=7696 MiB (60% of 12827 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_64/32
+Benchmarking branch_write/branches_64/32: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/32: Collecting 50 samples in estimated 2.0000 s (803k iterations)
+Benchmarking branch_write/branches_64/32: Analyzing
+branch_write/branches_64/32
+                        time:   [2.4615 µs 2.4691 µs 2.4780 µs]
+                        thrpt:  [153.56 MiB/s 154.11 MiB/s 154.59 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  3 (6.00%) high severe
+Benchmarking branch_write/branches_64/64
+Benchmarking branch_write/branches_64/64: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/64: Collecting 50 samples in estimated 2.0003 s (308k iterations)
+Benchmarking branch_write/branches_64/64: Analyzing
+branch_write/branches_64/64
+                        time:   [6.3517 µs 6.3693 µs 6.3891 µs]
+                        thrpt:  [121.65 MiB/s 122.03 MiB/s 122.37 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  3 (6.00%) high mild
+  3 (6.00%) high severe
+Benchmarking branch_write/branches_64/128
+Benchmarking branch_write/branches_64/128: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/128: Collecting 50 samples in estimated 2.0004 s (153k iterations)
+Benchmarking branch_write/branches_64/128: Analyzing
+branch_write/branches_64/128
+                        time:   [13.092 µs 13.209 µs 13.366 µs]
+                        thrpt:  [118.08 MiB/s 119.49 MiB/s 120.56 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  1 (2.00%) high mild
+  4 (8.00%) high severe
+Benchmarking branch_write/branches_256/32
+Benchmarking branch_write/branches_256/32: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/32: Collecting 50 samples in estimated 2.0001 s (769k iterations)
+Benchmarking branch_write/branches_256/32: Analyzing
+branch_write/branches_256/32
+                        time:   [2.5819 µs 2.6004 µs 2.6230 µs]
+                        thrpt:  [145.07 MiB/s 146.33 MiB/s 147.38 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  1 (2.00%) high mild
+  4 (8.00%) high severe
+Benchmarking branch_write/branches_256/64
+Benchmarking branch_write/branches_256/64: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/64: Collecting 50 samples in estimated 2.0001 s (299k iterations)
+Benchmarking branch_write/branches_256/64: Analyzing
+branch_write/branches_256/64
+                        time:   [6.5369 µs 6.5705 µs 6.6169 µs]
+                        thrpt:  [117.46 MiB/s 118.29 MiB/s 118.90 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  2 (4.00%) high mild
+  3 (6.00%) high severe
+Benchmarking branch_write/branches_256/128
+Benchmarking branch_write/branches_256/128: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/128: Collecting 50 samples in estimated 2.0003 s (127k iterations)
+Benchmarking branch_write/branches_256/128: Analyzing
+branch_write/branches_256/128
+                        time:   [15.906 µs 16.026 µs 16.163 µs]
+                        thrpt:  [102.13 MiB/s 103.01 MiB/s 103.79 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  2 (4.00%) high mild
+  4 (8.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover/baseline-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover/baseline-build.txt
new file mode 100644
index 0000000..c09d3ce
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover/baseline-build.txt
@@ -0,0 +1,3 @@
+memcap: <=7694 MiB (60% of 12823 MiB available) [systemd MemoryMax, swap off]
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+    Finished `bench` profile [optimized] target(s) in 2.76s
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new file mode 100644
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover/criterion-SHA256SUMS b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover/criterion-SHA256SUMS
new file mode 100644
index 0000000..3022a71
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover/criterion-SHA256SUMS
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover/criterion-results.tar.gz b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover/criterion-results.tar.gz
new file mode 100644
index 0000000..9944080
Binary files /dev/null and b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover/criterion-results.tar.gz differ
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover/current-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover/current-0.txt
new file mode 100644
index 0000000..838055b
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover/current-0.txt
@@ -0,0 +1,60 @@
+memcap: <=7694 MiB (60% of 12824 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_64/32
+Benchmarking branch_write/branches_64/32: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/32: Collecting 50 samples in estimated 2.0000 s (883k iterations)
+Benchmarking branch_write/branches_64/32: Analyzing
+branch_write/branches_64/32
+                        time:   [2.2716 µs 2.2926 µs 2.3172 µs]
+                        thrpt:  [164.22 MiB/s 165.98 MiB/s 167.51 MiB/s]
+Found 8 outliers among 50 measurements (16.00%)
+  2 (4.00%) high mild
+  6 (12.00%) high severe
+Benchmarking branch_write/branches_64/64
+Benchmarking branch_write/branches_64/64: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/64: Collecting 50 samples in estimated 2.0001 s (367k iterations)
+Benchmarking branch_write/branches_64/64: Analyzing
+branch_write/branches_64/64
+                        time:   [5.4381 µs 5.5062 µs 5.5924 µs]
+                        thrpt:  [138.98 MiB/s 141.16 MiB/s 142.92 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  2 (4.00%) high mild
+  5 (10.00%) high severe
+Benchmarking branch_write/branches_64/128
+Benchmarking branch_write/branches_64/128: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/128: Collecting 50 samples in estimated 2.0004 s (197k iterations)
+Benchmarking branch_write/branches_64/128: Analyzing
+branch_write/branches_64/128
+                        time:   [10.102 µs 10.160 µs 10.249 µs]
+                        thrpt:  [154.00 MiB/s 155.34 MiB/s 156.23 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  4 (8.00%) high mild
+  1 (2.00%) high severe
+Benchmarking branch_write/branches_256/32
+Benchmarking branch_write/branches_256/32: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/32: Collecting 50 samples in estimated 2.0000 s (831k iterations)
+Benchmarking branch_write/branches_256/32: Analyzing
+branch_write/branches_256/32
+                        time:   [2.3794 µs 2.4132 µs 2.4753 µs]
+                        thrpt:  [153.73 MiB/s 157.68 MiB/s 159.92 MiB/s]
+Found 2 outliers among 50 measurements (4.00%)
+  2 (4.00%) high severe
+Benchmarking branch_write/branches_256/64
+Benchmarking branch_write/branches_256/64: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/64: Collecting 50 samples in estimated 2.0002 s (237k iterations)
+Benchmarking branch_write/branches_256/64: Analyzing
+branch_write/branches_256/64
+                        time:   [8.3683 µs 8.4883 µs 8.6524 µs]
+                        thrpt:  [89.830 MiB/s 91.567 MiB/s 92.880 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  4 (8.00%) high severe
+Benchmarking branch_write/branches_256/128
+Benchmarking branch_write/branches_256/128: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/128: Collecting 50 samples in estimated 2.0002 s (150k iterations)
+Benchmarking branch_write/branches_256/128: Analyzing
+branch_write/branches_256/128
+                        time:   [13.106 µs 13.257 µs 13.427 µs]
+                        thrpt:  [122.95 MiB/s 124.52 MiB/s 125.96 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  5 (10.00%) high mild
+  1 (2.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover/current-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover/current-1.txt
new file mode 100644
index 0000000..0b6aa4d
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover/current-1.txt
@@ -0,0 +1,61 @@
+memcap: <=7695 MiB (60% of 12825 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_64/32
+Benchmarking branch_write/branches_64/32: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/32: Collecting 50 samples in estimated 2.0000 s (873k iterations)
+Benchmarking branch_write/branches_64/32: Analyzing
+branch_write/branches_64/32
+                        time:   [2.2649 µs 2.2924 µs 2.3331 µs]
+                        thrpt:  [163.09 MiB/s 165.99 MiB/s 168.01 MiB/s]
+Found 2 outliers among 50 measurements (4.00%)
+  2 (4.00%) high severe
+Benchmarking branch_write/branches_64/64
+Benchmarking branch_write/branches_64/64: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/64: Collecting 50 samples in estimated 2.0001 s (364k iterations)
+Benchmarking branch_write/branches_64/64: Analyzing
+branch_write/branches_64/64
+                        time:   [5.4511 µs 5.4771 µs 5.5109 µs]
+                        thrpt:  [141.04 MiB/s 141.91 MiB/s 142.58 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  2 (4.00%) high mild
+  2 (4.00%) high severe
+Benchmarking branch_write/branches_64/128
+Benchmarking branch_write/branches_64/128: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/128: Collecting 50 samples in estimated 2.0003 s (198k iterations)
+Benchmarking branch_write/branches_64/128: Analyzing
+branch_write/branches_64/128
+                        time:   [10.128 µs 10.246 µs 10.387 µs]
+                        thrpt:  [151.95 MiB/s 154.05 MiB/s 155.84 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  1 (2.00%) high mild
+  6 (12.00%) high severe
+Benchmarking branch_write/branches_256/32
+Benchmarking branch_write/branches_256/32: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/32: Collecting 50 samples in estimated 2.0000 s (835k iterations)
+Benchmarking branch_write/branches_256/32: Analyzing
+branch_write/branches_256/32
+                        time:   [2.3734 µs 2.3862 µs 2.4043 µs]
+                        thrpt:  [158.27 MiB/s 159.47 MiB/s 160.32 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  2 (4.00%) high mild
+  3 (6.00%) high severe
+Benchmarking branch_write/branches_256/64
+Benchmarking branch_write/branches_256/64: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/64: Collecting 50 samples in estimated 2.0003 s (231k iterations)
+Benchmarking branch_write/branches_256/64: Analyzing
+branch_write/branches_256/64
+                        time:   [8.5232 µs 8.6027 µs 8.7048 µs]
+                        thrpt:  [89.289 MiB/s 90.349 MiB/s 91.192 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  2 (4.00%) high mild
+  5 (10.00%) high severe
+Benchmarking branch_write/branches_256/128
+Benchmarking branch_write/branches_256/128: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/128: Collecting 50 samples in estimated 2.0006 s (152k iterations)
+Benchmarking branch_write/branches_256/128: Analyzing
+branch_write/branches_256/128
+                        time:   [12.966 µs 13.181 µs 13.492 µs]
+                        thrpt:  [122.36 MiB/s 125.24 MiB/s 127.32 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  2 (4.00%) high mild
+  2 (4.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover/current-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover/current-build.txt
new file mode 100644
index 0000000..ba6863e
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover/current-build.txt
@@ -0,0 +1,3 @@
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+    Finished `bench` profile [optimized] target(s) in 2.75s
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new file mode 100644
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover/harness.rs b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover/harness.rs
new file mode 100644
index 0000000..3fa0c28
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover/harness.rs
@@ -0,0 +1,77 @@
+use criterion::{
+    criterion_group, criterion_main, BenchmarkId, Criterion, SamplingMode, Throughput,
+};
+use polyxml::schema::ModelSchema;
+use polyxml::schema_parser::XsdParser;
+use polyxml::{deserialize, serialize, PolyValue};
+use std::{hint::black_box, sync::Arc};
+
+fn fixture(branches: usize, count: usize) -> (Arc<ModelSchema>, Vec<u8>) {
+    let declarations = (0..branches)
+        .map(|i| format!(r#"<xs:element name="B{i}" type="xs:int"/>"#))
+        .collect::<String>();
+    let xsd = format!(
+        r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"><xs:element name="Root"><xs:complexType mixed="true"><xs:choice minOccurs="0" maxOccurs="unbounded">{declarations}</xs:choice></xs:complexType></xs:element></xs:schema>"#
+    );
+    let ir = XsdParser::new().parse_str(&xsd).unwrap();
+    let schema = ModelSchema::from_ir(&ir, Some("Root")).unwrap();
+    let body = (0..count)
+        .map(|i| format!("<B{}>{i}</B{}>", i % branches, i % branches))
+        .collect::<String>();
+    let xml = format!("<Root>{body}</Root>").into_bytes();
+    let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+    let mixed = schema.mixed_content.as_ref().unwrap();
+    let field = &schema.fields[mixed.items_index].name;
+    let items = value.get(field).and_then(PolyValue::as_list).unwrap();
+    assert_eq!(items.len(), count);
+    for (i, item) in items.iter().enumerate() {
+        assert_eq!(item.get("value"), Some(&PolyValue::Int(i as i64)));
+        let kind = item.get("kind").and_then(PolyValue::as_str).unwrap();
+        let branch = mixed
+            .branches
+            .iter()
+            .find(|b| b.variant_name == kind)
+            .unwrap();
+        assert_eq!(branch.xml_name, format!("B{}", i % branches).as_bytes());
+    }
+    let output = serialize("Root", &value, &schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+    let output = serialize("Sensor", &value, &schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    (schema, xml)
+}
+
+fn benchmarks(c: &mut Criterion) {
+    for operation in ["branch_read", "branch_write"] {
+        let mut group = c.benchmark_group(operation);
+        group.sampling_mode(SamplingMode::Flat);
+        for branches in [64, 256] {
+            for count in [32, 64, 128] {
+                let (schema, xml) = fixture(branches, count);
+                let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+                group.throughput(Throughput::Bytes(xml.len() as u64));
+                group.bench_with_input(
+                    BenchmarkId::new(format!("branches_{branches}"), count),
+                    &count,
+                    |b, _| {
+                        b.iter(|| {
+                            if operation == "branch_read" {
+                                black_box(
+                                    deserialize(black_box(&xml), Arc::clone(&schema)).unwrap(),
+                                );
+                            } else {
+                                black_box(
+                                    serialize("Root", black_box(&value), &schema, None).unwrap(),
+                                );
+                            }
+                        });
+                    },
+                );
+            }
+        }
+        group.finish();
+    }
+}
+criterion_group!(benches, benchmarks);
+criterion_main!(benches);
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover/metadata.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover/metadata.json
new file mode 100644
index 0000000..6256244
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover/metadata.json
@@ -0,0 +1,19 @@
+{
+  "revisions": {
+    "baseline": "1819c91b0808b9242c642d82350d2b657b60108c",
+    "current": "d3bf1728be1d265b6b5d317946492cec9b4a6f8c"
+  },
+  "core_status": {
+    "baseline": "",
+    "current": ""
+  },
+  "sample_size": 50,
+  "warmup_seconds": 1.0,
+  "measurement_seconds": 2.0,
+  "rounds": 2,
+  "filter": "^branch_write/",
+  "order": "alternate baseline/current per round",
+  "os": "Linux-6.18.40.1-microsoft-standard-WSL2-x86_64-with-glibc2.43",
+  "cpu": "11th Gen Intel(R) Core(TM) i5-11600K @ 3.90GHz",
+  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)\nbinary: rustc\ncommit-hash: b940084d7eb6a299eb4bfeb8e34901bc051e7ac4\ncommit-date: 2026-09-28\nhost: x86_64-unknown-linux-gnu\nrelease: 1.99.0\nLLVM version: 23.1.1\n"
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover/summary.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover/summary.json
new file mode 100644
index 0000000..d43e4f4
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-crossover/summary.json
@@ -0,0 +1,314 @@
+{
+  "branch_write/branches_256/128": {
+    "baseline_ns": 15842.906612125716,
+    "candidate_ns": 13219.184980330016,
+    "delta_percent": -16.560860301906832,
+    "speedup": 1.198478320388115,
+    "process_deltas_percent": [
+      -15.343871323410252,
+      -17.75009662640963
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 15597.669321780228,
+            "upper_bound": 15736.82257995273
+          },
+          "point_estimate": 15660.179456478925,
+          "standard_error": 35.73034739116296
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 15906.03276382307,
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/baseline-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/baseline-0.txt
new file mode 100644
index 0000000..60d1dd0
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/baseline-0.txt
@@ -0,0 +1,42 @@
+memcap: <=7624 MiB (60% of 12706 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_1/1000
+Benchmarking branch_write/branches_1/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_1/1000: Collecting 100 samples in estimated 5.0027 s (79k iterations)
+Benchmarking branch_write/branches_1/1000: Analyzing
+branch_write/branches_1/1000
+                        time:   [63.644 µs 64.518 µs 65.613 µs]
+                        thrpt:  [173.01 MiB/s 175.94 MiB/s 178.36 MiB/s]
+Found 14 outliers among 100 measurements (14.00%)
+  4 (4.00%) high mild
+  10 (10.00%) high severe
+Benchmarking branch_write/branches_16/1000
+Benchmarking branch_write/branches_16/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_16/1000: Collecting 100 samples in estimated 5.0062 s (72k iterations)
+Benchmarking branch_write/branches_16/1000: Analyzing
+branch_write/branches_16/1000
+                        time:   [68.795 µs 69.053 µs 69.377 µs]
+                        thrpt:  [173.85 MiB/s 174.66 MiB/s 175.32 MiB/s]
+Found 11 outliers among 100 measurements (11.00%)
+  6 (6.00%) high mild
+  5 (5.00%) high severe
+Benchmarking branch_write/branches_64/1000
+Benchmarking branch_write/branches_64/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_64/1000: Collecting 100 samples in estimated 5.0007 s (48k iterations)
+Benchmarking branch_write/branches_64/1000: Analyzing
+branch_write/branches_64/1000
+                        time:   [104.21 µs 104.52 µs 104.87 µs]
+                        thrpt:  [123.52 MiB/s 123.93 MiB/s 124.30 MiB/s]
+Found 9 outliers among 100 measurements (9.00%)
+  4 (4.00%) high mild
+  5 (5.00%) high severe
+Benchmarking branch_write/branches_256/1000
+Benchmarking branch_write/branches_256/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_256/1000: Collecting 100 samples in estimated 5.0161 s (29k iterations)
+Benchmarking branch_write/branches_256/1000: Analyzing
+branch_write/branches_256/1000
+                        time:   [174.17 µs 175.28 µs 176.76 µs]
+                        thrpt:  [81.052 MiB/s 81.737 MiB/s 82.258 MiB/s]
+Found 9 outliers among 100 measurements (9.00%)
+  3 (3.00%) high mild
+  6 (6.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/baseline-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/baseline-1.txt
new file mode 100644
index 0000000..2c21da3
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/baseline-1.txt
@@ -0,0 +1,42 @@
+memcap: <=7696 MiB (60% of 12827 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_1/1000
+Benchmarking branch_write/branches_1/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_1/1000: Collecting 100 samples in estimated 5.0026 s (78k iterations)
+Benchmarking branch_write/branches_1/1000: Analyzing
+branch_write/branches_1/1000
+                        time:   [64.414 µs 64.841 µs 65.384 µs]
+                        thrpt:  [173.61 MiB/s 175.07 MiB/s 176.23 MiB/s]
+Found 13 outliers among 100 measurements (13.00%)
+  5 (5.00%) high mild
+  8 (8.00%) high severe
+Benchmarking branch_write/branches_16/1000
+Benchmarking branch_write/branches_16/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_16/1000: Collecting 100 samples in estimated 5.0008 s (72k iterations)
+Benchmarking branch_write/branches_16/1000: Analyzing
+branch_write/branches_16/1000
+                        time:   [69.638 µs 70.082 µs 70.633 µs]
+                        thrpt:  [170.76 MiB/s 172.10 MiB/s 173.20 MiB/s]
+Found 13 outliers among 100 measurements (13.00%)
+  7 (7.00%) high mild
+  6 (6.00%) high severe
+Benchmarking branch_write/branches_64/1000
+Benchmarking branch_write/branches_64/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_64/1000: Collecting 100 samples in estimated 5.0094 s (48k iterations)
+Benchmarking branch_write/branches_64/1000: Analyzing
+branch_write/branches_64/1000
+                        time:   [105.26 µs 106.93 µs 109.15 µs]
+                        thrpt:  [118.68 MiB/s 121.14 MiB/s 123.06 MiB/s]
+Found 17 outliers among 100 measurements (17.00%)
+  5 (5.00%) high mild
+  12 (12.00%) high severe
+Benchmarking branch_write/branches_256/1000
+Benchmarking branch_write/branches_256/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_256/1000: Collecting 100 samples in estimated 5.0080 s (28k iterations)
+Benchmarking branch_write/branches_256/1000: Analyzing
+branch_write/branches_256/1000
+                        time:   [175.69 µs 176.59 µs 177.59 µs]
+                        thrpt:  [80.673 MiB/s 81.133 MiB/s 81.546 MiB/s]
+Found 14 outliers among 100 measurements (14.00%)
+  3 (3.00%) high mild
+  11 (11.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/baseline-2.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/baseline-2.txt
new file mode 100644
index 0000000..6a2341b
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/baseline-2.txt
@@ -0,0 +1,41 @@
+memcap: <=7695 MiB (60% of 12825 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_1/1000
+Benchmarking branch_write/branches_1/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_1/1000: Collecting 100 samples in estimated 5.0027 s (74k iterations)
+Benchmarking branch_write/branches_1/1000: Analyzing
+branch_write/branches_1/1000
+                        time:   [66.459 µs 66.705 µs 66.992 µs]
+                        thrpt:  [169.45 MiB/s 170.18 MiB/s 170.81 MiB/s]
+Found 7 outliers among 100 measurements (7.00%)
+  1 (1.00%) high mild
+  6 (6.00%) high severe
+Benchmarking branch_write/branches_16/1000
+Benchmarking branch_write/branches_16/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_16/1000: Collecting 100 samples in estimated 5.0018 s (68k iterations)
+Benchmarking branch_write/branches_16/1000: Analyzing
+branch_write/branches_16/1000
+                        time:   [74.380 µs 75.255 µs 76.287 µs]
+                        thrpt:  [158.10 MiB/s 160.27 MiB/s 162.15 MiB/s]
+Found 14 outliers among 100 measurements (14.00%)
+  5 (5.00%) high mild
+  9 (9.00%) high severe
+Benchmarking branch_write/branches_64/1000
+Benchmarking branch_write/branches_64/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_64/1000: Collecting 100 samples in estimated 5.0078 s (46k iterations)
+Benchmarking branch_write/branches_64/1000: Analyzing
+branch_write/branches_64/1000
+                        time:   [107.85 µs 108.40 µs 109.05 µs]
+                        thrpt:  [118.79 MiB/s 119.50 MiB/s 120.11 MiB/s]
+Found 10 outliers among 100 measurements (10.00%)
+  3 (3.00%) high mild
+  7 (7.00%) high severe
+Benchmarking branch_write/branches_256/1000
+Benchmarking branch_write/branches_256/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_256/1000: Collecting 100 samples in estimated 5.0132 s (28k iterations)
+Benchmarking branch_write/branches_256/1000: Analyzing
+branch_write/branches_256/1000
+                        time:   [181.87 µs 183.52 µs 185.32 µs]
+                        thrpt:  [77.308 MiB/s 78.070 MiB/s 78.775 MiB/s]
+Found 3 outliers among 100 measurements (3.00%)
+  3 (3.00%) high mild
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/baseline-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/baseline-build.txt
new file mode 100644
index 0000000..96ae13b
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/baseline-build.txt
@@ -0,0 +1,3 @@
+memcap: <=7699 MiB (60% of 12833 MiB available) [systemd MemoryMax, swap off]
+   Compiling core-regression v0.0.0 (/home/bailey/github/polyxml-mixed-index/benchmarks/rust-xml-regression/target/core-baseline)
+    Finished `bench` profile [optimized] target(s) in 2.73s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/baseline.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/baseline.lock
new file mode 100644
index 0000000..78a11b2
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/baseline.lock
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/criterion-SHA256SUMS b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/criterion-SHA256SUMS
new file mode 100644
index 0000000..95ace09
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/criterion-SHA256SUMS
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/criterion-results.tar.gz b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/criterion-results.tar.gz
new file mode 100644
index 0000000..1e09984
Binary files /dev/null and b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/criterion-results.tar.gz differ
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/current-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/current-0.txt
new file mode 100644
index 0000000..f5aa215
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/current-0.txt
@@ -0,0 +1,42 @@
+memcap: <=7693 MiB (60% of 12823 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_1/1000
+Benchmarking branch_write/branches_1/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_1/1000: Collecting 100 samples in estimated 5.0019 s (82k iterations)
+Benchmarking branch_write/branches_1/1000: Analyzing
+branch_write/branches_1/1000
+                        time:   [59.943 µs 60.280 µs 60.670 µs]
+                        thrpt:  [187.10 MiB/s 188.31 MiB/s 189.37 MiB/s]
+Found 9 outliers among 100 measurements (9.00%)
+  1 (1.00%) high mild
+  8 (8.00%) high severe
+Benchmarking branch_write/branches_16/1000
+Benchmarking branch_write/branches_16/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_16/1000: Collecting 100 samples in estimated 5.0055 s (77k iterations)
+Benchmarking branch_write/branches_16/1000: Analyzing
+branch_write/branches_16/1000
+                        time:   [64.598 µs 64.851 µs 65.156 µs]
+                        thrpt:  [185.11 MiB/s 185.98 MiB/s 186.71 MiB/s]
+Found 10 outliers among 100 measurements (10.00%)
+  6 (6.00%) high mild
+  4 (4.00%) high severe
+Benchmarking branch_write/branches_64/1000
+Benchmarking branch_write/branches_64/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_64/1000: Collecting 100 samples in estimated 5.0041 s (68k iterations)
+Benchmarking branch_write/branches_64/1000: Analyzing
+branch_write/branches_64/1000
+                        time:   [73.117 µs 73.609 µs 74.176 µs]
+                        thrpt:  [174.64 MiB/s 175.98 MiB/s 177.16 MiB/s]
+Found 12 outliers among 100 measurements (12.00%)
+  3 (3.00%) high mild
+  9 (9.00%) high severe
+Benchmarking branch_write/branches_256/1000
+Benchmarking branch_write/branches_256/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_256/1000: Collecting 100 samples in estimated 5.0049 s (63k iterations)
+Benchmarking branch_write/branches_256/1000: Analyzing
+branch_write/branches_256/1000
+                        time:   [78.801 µs 79.247 µs 79.766 µs]
+                        thrpt:  [179.61 MiB/s 180.79 MiB/s 181.81 MiB/s]
+Found 11 outliers among 100 measurements (11.00%)
+  2 (2.00%) high mild
+  9 (9.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/current-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/current-1.txt
new file mode 100644
index 0000000..bcb8e9b
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/current-1.txt
@@ -0,0 +1,42 @@
+memcap: <=7697 MiB (60% of 12828 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_1/1000
+Benchmarking branch_write/branches_1/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_1/1000: Collecting 100 samples in estimated 5.0047 s (84k iterations)
+Benchmarking branch_write/branches_1/1000: Analyzing
+branch_write/branches_1/1000
+                        time:   [61.342 µs 62.347 µs 63.573 µs]
+                        thrpt:  [178.56 MiB/s 182.07 MiB/s 185.05 MiB/s]
+Found 12 outliers among 100 measurements (12.00%)
+  3 (3.00%) high mild
+  9 (9.00%) high severe
+Benchmarking branch_write/branches_16/1000
+Benchmarking branch_write/branches_16/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_16/1000: Collecting 100 samples in estimated 5.0052 s (77k iterations)
+Benchmarking branch_write/branches_16/1000: Analyzing
+branch_write/branches_16/1000
+                        time:   [65.027 µs 65.587 µs 66.325 µs]
+                        thrpt:  [181.85 MiB/s 183.89 MiB/s 185.48 MiB/s]
+Found 8 outliers among 100 measurements (8.00%)
+  1 (1.00%) high mild
+  7 (7.00%) high severe
+Benchmarking branch_write/branches_64/1000
+Benchmarking branch_write/branches_64/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_64/1000: Collecting 100 samples in estimated 5.0020 s (69k iterations)
+Benchmarking branch_write/branches_64/1000: Analyzing
+branch_write/branches_64/1000
+                        time:   [73.423 µs 73.844 µs 74.315 µs]
+                        thrpt:  [174.31 MiB/s 175.42 MiB/s 176.43 MiB/s]
+Found 10 outliers among 100 measurements (10.00%)
+  2 (2.00%) high mild
+  8 (8.00%) high severe
+Benchmarking branch_write/branches_256/1000
+Benchmarking branch_write/branches_256/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_256/1000: Collecting 100 samples in estimated 5.0066 s (64k iterations)
+Benchmarking branch_write/branches_256/1000: Analyzing
+branch_write/branches_256/1000
+                        time:   [79.176 µs 79.684 µs 80.275 µs]
+                        thrpt:  [178.47 MiB/s 179.80 MiB/s 180.95 MiB/s]
+Found 11 outliers among 100 measurements (11.00%)
+  5 (5.00%) high mild
+  6 (6.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/current-2.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/current-2.txt
new file mode 100644
index 0000000..def117a
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/current-2.txt
@@ -0,0 +1,41 @@
+memcap: <=7702 MiB (60% of 12837 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_1/1000
+Benchmarking branch_write/branches_1/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_1/1000: Collecting 100 samples in estimated 5.0019 s (82k iterations)
+Benchmarking branch_write/branches_1/1000: Analyzing
+branch_write/branches_1/1000
+                        time:   [60.869 µs 61.384 µs 62.062 µs]
+                        thrpt:  [182.91 MiB/s 184.93 MiB/s 186.49 MiB/s]
+Found 8 outliers among 100 measurements (8.00%)
+  2 (2.00%) high mild
+  6 (6.00%) high severe
+Benchmarking branch_write/branches_16/1000
+Benchmarking branch_write/branches_16/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_16/1000: Collecting 100 samples in estimated 5.0062 s (76k iterations)
+Benchmarking branch_write/branches_16/1000: Analyzing
+branch_write/branches_16/1000
+                        time:   [65.375 µs 65.962 µs 66.674 µs]
+                        thrpt:  [180.90 MiB/s 182.85 MiB/s 184.49 MiB/s]
+Found 15 outliers among 100 measurements (15.00%)
+  2 (2.00%) high mild
+  13 (13.00%) high severe
+Benchmarking branch_write/branches_64/1000
+Benchmarking branch_write/branches_64/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_64/1000: Collecting 100 samples in estimated 5.0044 s (68k iterations)
+Benchmarking branch_write/branches_64/1000: Analyzing
+branch_write/branches_64/1000
+                        time:   [73.751 µs 74.308 µs 74.946 µs]
+                        thrpt:  [172.84 MiB/s 174.33 MiB/s 175.64 MiB/s]
+Found 11 outliers among 100 measurements (11.00%)
+  5 (5.00%) high mild
+  6 (6.00%) high severe
+Benchmarking branch_write/branches_256/1000
+Benchmarking branch_write/branches_256/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_256/1000: Collecting 100 samples in estimated 5.0036 s (64k iterations)
+Benchmarking branch_write/branches_256/1000: Analyzing
+branch_write/branches_256/1000
+                        time:   [78.069 µs 78.579 µs 79.227 µs]
+                        thrpt:  [180.84 MiB/s 182.33 MiB/s 183.52 MiB/s]
+Found 8 outliers among 100 measurements (8.00%)
+  8 (8.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/current-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/current-build.txt
new file mode 100644
index 0000000..b48d698
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/current-build.txt
@@ -0,0 +1,3 @@
+memcap: <=7653 MiB (60% of 12755 MiB available) [systemd MemoryMax, swap off]
+   Compiling core-regression v0.0.0 (/home/bailey/github/polyxml-mixed-index/benchmarks/rust-xml-regression/target/core-current)
+    Finished `bench` profile [optimized] target(s) in 2.74s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/current.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/current.lock
new file mode 100644
index 0000000..78a11b2
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/current.lock
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/harness.rs b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/harness.rs
new file mode 100644
index 0000000..04793ae
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/harness.rs
@@ -0,0 +1,77 @@
+use criterion::{
+    criterion_group, criterion_main, BenchmarkId, Criterion, SamplingMode, Throughput,
+};
+use polyxml::schema::ModelSchema;
+use polyxml::schema_parser::XsdParser;
+use polyxml::{deserialize, serialize, PolyValue};
+use std::{hint::black_box, sync::Arc};
+
+fn fixture(branches: usize, count: usize) -> (Arc<ModelSchema>, Vec<u8>) {
+    let declarations = (0..branches)
+        .map(|i| format!(r#"<xs:element name="B{i}" type="xs:int"/>"#))
+        .collect::<String>();
+    let xsd = format!(
+        r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"><xs:element name="Root"><xs:complexType mixed="true"><xs:choice minOccurs="0" maxOccurs="unbounded">{declarations}</xs:choice></xs:complexType></xs:element></xs:schema>"#
+    );
+    let ir = XsdParser::new().parse_str(&xsd).unwrap();
+    let schema = ModelSchema::from_ir(&ir, Some("Root")).unwrap();
+    let body = (0..count)
+        .map(|i| format!("<B{}>{i}</B{}>", i % branches, i % branches))
+        .collect::<String>();
+    let xml = format!("<Root>{body}</Root>").into_bytes();
+    let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+    let mixed = schema.mixed_content.as_ref().unwrap();
+    let field = &schema.fields[mixed.items_index].name;
+    let items = value.get(field).and_then(PolyValue::as_list).unwrap();
+    assert_eq!(items.len(), count);
+    for (i, item) in items.iter().enumerate() {
+        assert_eq!(item.get("value"), Some(&PolyValue::Int(i as i64)));
+        let kind = item.get("kind").and_then(PolyValue::as_str).unwrap();
+        let branch = mixed
+            .branches
+            .iter()
+            .find(|b| b.variant_name == kind)
+            .unwrap();
+        assert_eq!(branch.xml_name, format!("B{}", i % branches).as_bytes());
+    }
+    let output = serialize("Root", &value, &schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+    let output = serialize("Sensor", &value, &schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    (schema, xml)
+}
+
+fn benchmarks(c: &mut Criterion) {
+    for operation in ["branch_read", "branch_write"] {
+        let mut group = c.benchmark_group(operation);
+        group.sampling_mode(SamplingMode::Flat);
+        for branches in [1, 16, 64, 256] {
+            for count in [1, 32, 64, 128, 1000, 1024] {
+                let (schema, xml) = fixture(branches, count);
+                let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+                group.throughput(Throughput::Bytes(xml.len() as u64));
+                group.bench_with_input(
+                    BenchmarkId::new(format!("branches_{branches}"), count),
+                    &count,
+                    |b, _| {
+                        b.iter(|| {
+                            if operation == "branch_read" {
+                                black_box(
+                                    deserialize(black_box(&xml), Arc::clone(&schema)).unwrap(),
+                                );
+                            } else {
+                                black_box(
+                                    serialize("Root", black_box(&value), &schema, None).unwrap(),
+                                );
+                            }
+                        });
+                    },
+                );
+            }
+        }
+        group.finish();
+    }
+}
+criterion_group!(benches, benchmarks);
+criterion_main!(benches);
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/metadata.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/metadata.json
new file mode 100644
index 0000000..4756b4a
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/metadata.json
@@ -0,0 +1,19 @@
+{
+  "revisions": {
+    "baseline": "1819c91b0808b9242c642d82350d2b657b60108c",
+    "current": "58cb346f964b5196dfad62e8a62a8aa4beb9beef"
+  },
+  "core_status": {
+    "baseline": "",
+    "current": ""
+  },
+  "sample_size": 100,
+  "warmup_seconds": 3.0,
+  "measurement_seconds": 5.0,
+  "rounds": 3,
+  "filter": "^branch_write/.*/1000$",
+  "order": "alternate baseline/current per round",
+  "os": "Linux-6.18.40.1-microsoft-standard-WSL2-x86_64-with-glibc2.43",
+  "cpu": "11th Gen Intel(R) Core(TM) i5-11600K @ 3.90GHz",
+  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)\nbinary: rustc\ncommit-hash: b940084d7eb6a299eb4bfeb8e34901bc051e7ac4\ncommit-date: 2026-09-28\nhost: x86_64-unknown-linux-gnu\nrelease: 1.99.0\nLLVM version: 23.1.1\n"
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/summary.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/summary.json
new file mode 100644
index 0000000..4b8a42f
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final-sampled/summary.json
@@ -0,0 +1,286 @@
+{
+  "branch_write/branches_1/1000": {
+    "baseline_ns": 64840.89875000002,
+    "candidate_ns": 61384.253556638294,
+    "delta_percent": -5.330964345033429,
+    "speedup": 1.0563115944738553,
+    "process_deltas_percent": [
+      -6.5687845934779165,
+      -3.845952070065284,
+      -7.976145308029969
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 63644.04522646313,
+            "upper_bound": 65613.0836882952
+          },
+          "point_estimate": 64518.43543256998,
+          "standard_error": 503.6326045279774
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 64414.0209239691,
+            "upper_bound": 65384.353358891756
+          },
+          "point_estimate": 64840.89875000002,
+          "standard_error": 249.13403138195014
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 66458.94928018996,
+            "upper_bound": 66992.44951322934
+          },
+          "point_estimate": 66704.71886024425,
+          "standard_error": 137.04133491565395
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 59943.371561893226,
+            "upper_bound": 60669.83193112864
+          },
+          "point_estimate": 60280.35838592233,
+          "standard_error": 186.5268567862184
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 61342.14126497007,
+            "upper_bound": 63573.33493982037
+          },
+          "point_estimate": 62347.14886227546,
+          "standard_error": 572.8310863360721
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 60869.327426309384,
+            "upper_bound": 62061.77141930575
+          },
+          "point_estimate": 61384.253556638294,
+          "standard_error": 307.8820253565104
+        }
+      ]
+    }
+  },
+  "branch_write/branches_16/1000": {
+    "baseline_ns": 70081.64977622377,
+    "candidate_ns": 65587.28211413749,
+    "delta_percent": -6.413044893259723,
+    "speedup": 1.068524987119683,
+    "process_deltas_percent": [
+      -6.085212373694116,
+      -6.413044893259723,
+      -12.348980467310444
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 68794.54271682962,
+            "upper_bound": 69377.21092423184
+          },
+          "point_estimate": 69052.9498463687,
+          "standard_error": 149.25932225848084
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 69637.68735209791,
+            "upper_bound": 70632.75046503499
+          },
+          "point_estimate": 70081.64977622377,
+          "standard_error": 253.83261307008686
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 74380.4520825926,
+            "upper_bound": 76287.03527185187
+          },
+          "point_estimate": 75255.27654814813,
+          "standard_error": 487.44349713433587
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 64597.65796158852,
+            "upper_bound": 65155.8829817708
+          },
+          "point_estimate": 64850.93119791669,
+          "standard_error": 143.17101094977323
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 65026.50968774318,
+            "upper_bound": 66325.32756225683
+          },
+          "point_estimate": 65587.28211413749,
+          "standard_error": 334.08228089570775
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 65375.256552356026,
+            "upper_bound": 66673.5657408377
+          },
+          "point_estimate": 65962.01714659686,
+          "standard_error": 332.4553902995952
+        }
+      ]
+    }
+  },
+  "branch_write/branches_256/1000": {
+    "baseline_ns": 176587.64968421057,
+    "candidate_ns": 79247.35299524566,
+    "delta_percent": -55.12293575628722,
+    "speedup": 2.2283097543309074,
+    "process_deltas_percent": [
+      -54.78871743875001,
+      -54.875881305895156,
+      -57.180942771775
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 174171.90258479022,
+            "upper_bound": 176764.55552622376
+          },
+          "point_estimate": 175282.24926573428,
+          "standard_error": 673.0035120624941
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 175693.80177894738,
+            "upper_bound": 177593.7311859649
+          },
+          "point_estimate": 176587.64968421057,
+          "standard_error": 486.5334470183588
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 181872.06624283144,
+            "upper_bound": 185323.78319623665
+          },
+          "point_estimate": 183515.04,
+          "standard_error": 882.9174343530213
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 78801.35197622821,
+            "upper_bound": 79766.24491283677
+          },
+          "point_estimate": 79247.35299524566,
+          "standard_error": 247.37733140505225
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 79175.71828840129,
+            "upper_bound": 80274.93421747655
+          },
+          "point_estimate": 79683.62064263322,
+          "standard_error": 280.8912543115207
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 78069.229344584,
+            "upper_bound": 79226.68116522767
+          },
+          "point_estimate": 78579.41,
+          "standard_error": 298.2902170676677
+        }
+      ]
+    }
+  },
+  "branch_write/branches_64/1000": {
+    "baseline_ns": 106933.3364300626,
+    "candidate_ns": 73843.82706395349,
+    "delta_percent": -30.944053997371135,
+    "speedup": 1.4481012250008585,
+    "process_deltas_percent": [
+      -29.577110397272754,
+      -30.944053997371135,
+      -31.451757311386352
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 104212.30003190375,
+            "upper_bound": 104872.95409989536
+          },
+          "point_estimate": 104523.87596234311,
+          "standard_error": 168.74259111457647
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 105262.63731106473,
+            "upper_bound": 109148.49503131521
+          },
+          "point_estimate": 106933.3364300626,
+          "standard_error": 1003.3451426097735
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 107852.12731956522,
+            "upper_bound": 109047.59701739132
+          },
+          "point_estimate": 108402.11617391303,
+          "standard_error": 305.7798073834942
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 73117.41611530018,
+            "upper_bound": 74175.71359699852
+          },
+          "point_estimate": 73608.73377745245,
+          "standard_error": 271.2468976020402
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 73422.57636664246,
+            "upper_bound": 74315.19048873543
+          },
+          "point_estimate": 73843.82706395349,
+          "standard_error": 227.68174098328495
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 73751.26457807915,
+            "upper_bound": 74946.11745931084
+          },
+          "point_estimate": 74307.74567448681,
+          "standard_error": 305.95582819997765
+        }
+      ]
+    }
+  }
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final/baseline-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final/baseline-0.txt
new file mode 100644
index 0000000..e7a6dbb
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final/baseline-0.txt
@@ -0,0 +1,42 @@
+memcap: <=7628 MiB (60% of 12713 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_1/1000
+Benchmarking branch_write/branches_1/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_1/1000: Collecting 100 samples in estimated 5.0060 s (78k iterations)
+Benchmarking branch_write/branches_1/1000: Analyzing
+branch_write/branches_1/1000
+                        time:   [63.448 µs 63.622 µs 63.821 µs]
+                        thrpt:  [177.87 MiB/s 178.42 MiB/s 178.91 MiB/s]
+Found 7 outliers among 100 measurements (7.00%)
+  1 (1.00%) high mild
+  6 (6.00%) high severe
+Benchmarking branch_write/branches_16/1000
+Benchmarking branch_write/branches_16/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_16/1000: Collecting 100 samples in estimated 5.0040 s (72k iterations)
+Benchmarking branch_write/branches_16/1000: Analyzing
+branch_write/branches_16/1000
+                        time:   [68.882 µs 69.575 µs 70.520 µs]
+                        thrpt:  [171.03 MiB/s 173.35 MiB/s 175.10 MiB/s]
+Found 15 outliers among 100 measurements (15.00%)
+  6 (6.00%) high mild
+  9 (9.00%) high severe
+Benchmarking branch_write/branches_64/1000
+Benchmarking branch_write/branches_64/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_64/1000: Collecting 100 samples in estimated 5.0004 s (50k iterations)
+Benchmarking branch_write/branches_64/1000: Analyzing
+branch_write/branches_64/1000
+                        time:   [100.17 µs 100.87 µs 101.69 µs]
+                        thrpt:  [127.39 MiB/s 128.42 MiB/s 129.31 MiB/s]
+Found 12 outliers among 100 measurements (12.00%)
+  7 (7.00%) high mild
+  5 (5.00%) high severe
+Benchmarking branch_write/branches_256/1000
+Benchmarking branch_write/branches_256/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_256/1000: Collecting 100 samples in estimated 5.0079 s (29k iterations)
+Benchmarking branch_write/branches_256/1000: Analyzing
+branch_write/branches_256/1000
+                        time:   [167.75 µs 168.35 µs 169.07 µs]
+                        thrpt:  [84.742 MiB/s 85.104 MiB/s 85.409 MiB/s]
+Found 9 outliers among 100 measurements (9.00%)
+  5 (5.00%) high mild
+  4 (4.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final/baseline-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final/baseline-1.txt
new file mode 100644
index 0000000..7f31088
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final/baseline-1.txt
@@ -0,0 +1,42 @@
+memcap: <=7709 MiB (60% of 12849 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_1/1000
+Benchmarking branch_write/branches_1/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_1/1000: Collecting 100 samples in estimated 5.0057 s (76k iterations)
+Benchmarking branch_write/branches_1/1000: Analyzing
+branch_write/branches_1/1000
+                        time:   [63.952 µs 65.091 µs 66.655 µs]
+                        thrpt:  [170.30 MiB/s 174.39 MiB/s 177.50 MiB/s]
+Found 10 outliers among 100 measurements (10.00%)
+  5 (5.00%) high mild
+  5 (5.00%) high severe
+Benchmarking branch_write/branches_16/1000
+Benchmarking branch_write/branches_16/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_16/1000: Collecting 100 samples in estimated 5.0034 s (71k iterations)
+Benchmarking branch_write/branches_16/1000: Analyzing
+branch_write/branches_16/1000
+                        time:   [68.493 µs 68.790 µs 69.129 µs]
+                        thrpt:  [174.47 MiB/s 175.33 MiB/s 176.09 MiB/s]
+Found 13 outliers among 100 measurements (13.00%)
+  7 (7.00%) high mild
+  6 (6.00%) high severe
+Benchmarking branch_write/branches_64/1000
+Benchmarking branch_write/branches_64/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_64/1000: Collecting 100 samples in estimated 5.0012 s (49k iterations)
+Benchmarking branch_write/branches_64/1000: Analyzing
+branch_write/branches_64/1000
+                        time:   [98.635 µs 99.087 µs 99.606 µs]
+                        thrpt:  [130.05 MiB/s 130.73 MiB/s 131.33 MiB/s]
+Found 13 outliers among 100 measurements (13.00%)
+  5 (5.00%) high mild
+  8 (8.00%) high severe
+Benchmarking branch_write/branches_256/1000
+Benchmarking branch_write/branches_256/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_256/1000: Collecting 100 samples in estimated 5.0047 s (30k iterations)
+Benchmarking branch_write/branches_256/1000: Analyzing
+branch_write/branches_256/1000
+                        time:   [168.20 µs 169.58 µs 171.35 µs]
+                        thrpt:  [83.611 MiB/s 84.487 MiB/s 85.180 MiB/s]
+Found 15 outliers among 100 measurements (15.00%)
+  5 (5.00%) high mild
+  10 (10.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final/baseline-2.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final/baseline-2.txt
new file mode 100644
index 0000000..a35ffc9
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final/baseline-2.txt
@@ -0,0 +1,42 @@
+memcap: <=7719 MiB (60% of 12865 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_1/1000
+Benchmarking branch_write/branches_1/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_1/1000: Collecting 100 samples in estimated 5.0009 s (79k iterations)
+Benchmarking branch_write/branches_1/1000: Analyzing
+branch_write/branches_1/1000
+                        time:   [64.444 µs 64.850 µs 65.340 µs]
+                        thrpt:  [173.73 MiB/s 175.04 MiB/s 176.15 MiB/s]
+Found 6 outliers among 100 measurements (6.00%)
+  1 (1.00%) high mild
+  5 (5.00%) high severe
+Benchmarking branch_write/branches_16/1000
+Benchmarking branch_write/branches_16/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_16/1000: Collecting 100 samples in estimated 5.0018 s (72k iterations)
+Benchmarking branch_write/branches_16/1000: Analyzing
+branch_write/branches_16/1000
+                        time:   [69.460 µs 69.871 µs 70.331 µs]
+                        thrpt:  [171.49 MiB/s 172.62 MiB/s 173.64 MiB/s]
+Found 11 outliers among 100 measurements (11.00%)
+  6 (6.00%) high mild
+  5 (5.00%) high severe
+Benchmarking branch_write/branches_64/1000
+Benchmarking branch_write/branches_64/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_64/1000: Collecting 100 samples in estimated 5.0055 s (51k iterations)
+Benchmarking branch_write/branches_64/1000: Analyzing
+branch_write/branches_64/1000
+                        time:   [99.338 µs 99.859 µs 100.58 µs]
+                        thrpt:  [128.79 MiB/s 129.72 MiB/s 130.40 MiB/s]
+Found 7 outliers among 100 measurements (7.00%)
+  3 (3.00%) high mild
+  4 (4.00%) high severe
+Benchmarking branch_write/branches_256/1000
+Benchmarking branch_write/branches_256/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_256/1000: Collecting 100 samples in estimated 5.0022 s (30k iterations)
+Benchmarking branch_write/branches_256/1000: Analyzing
+branch_write/branches_256/1000
+                        time:   [168.40 µs 169.21 µs 170.16 µs]
+                        thrpt:  [84.199 MiB/s 84.668 MiB/s 85.076 MiB/s]
+Found 11 outliers among 100 measurements (11.00%)
+  3 (3.00%) high mild
+  8 (8.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final/baseline-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final/baseline-build.txt
new file mode 100644
index 0000000..56818ad
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final/baseline-build.txt
@@ -0,0 +1,3 @@
+memcap: <=7721 MiB (60% of 12868 MiB available) [systemd MemoryMax, swap off]
+   Compiling core-regression v0.0.0 (/home/bailey/github/polyxml-mixed-index/benchmarks/rust-xml-regression/target/core-baseline)
+    Finished `bench` profile [optimized] target(s) in 2.96s
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final/criterion-SHA256SUMS b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final/criterion-SHA256SUMS
new file mode 100644
index 0000000..fd275ca
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final/criterion-SHA256SUMS
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+91dc163c5cd0738e76722ddf3616bfd1f3f5d7f32806ae63ad9de9a9a5eebcd0  current-1/branch_write/branches_256/1000/new/estimates.json
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+cdd2739fb418b9dc1fc6486c1d6ab96bd554125bb647b5667be6d770c3d4cbc7  current-2/branch_write/branches_1/1000/base/estimates.json
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+0f856c441c42f5a6a8fe0f79f6468c54cb9e708782ab9593970c23bc91490014  current-2/branch_write/branches_16/1000/base/benchmark.json
+651975a020d94cd69935135c6cb0a41bff73e88baac45984e0292de4456adf62  current-2/branch_write/branches_16/1000/base/estimates.json
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final/criterion-results.tar.gz b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final/criterion-results.tar.gz
new file mode 100644
index 0000000..faa5516
Binary files /dev/null and b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final/criterion-results.tar.gz differ
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final/current-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final/current-0.txt
new file mode 100644
index 0000000..071d9eb
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final/current-0.txt
@@ -0,0 +1,42 @@
+memcap: <=7722 MiB (60% of 12870 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_1/1000
+Benchmarking branch_write/branches_1/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_1/1000: Collecting 100 samples in estimated 5.0040 s (83k iterations)
+Benchmarking branch_write/branches_1/1000: Analyzing
+branch_write/branches_1/1000
+                        time:   [58.968 µs 59.325 µs 59.746 µs]
+                        thrpt:  [190.00 MiB/s 191.35 MiB/s 192.50 MiB/s]
+Found 11 outliers among 100 measurements (11.00%)
+  2 (2.00%) high mild
+  9 (9.00%) high severe
+Benchmarking branch_write/branches_16/1000
+Benchmarking branch_write/branches_16/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_16/1000: Collecting 100 samples in estimated 5.0040 s (75k iterations)
+Benchmarking branch_write/branches_16/1000: Analyzing
+branch_write/branches_16/1000
+                        time:   [64.883 µs 65.136 µs 65.449 µs]
+                        thrpt:  [184.28 MiB/s 185.17 MiB/s 185.89 MiB/s]
+Found 8 outliers among 100 measurements (8.00%)
+  2 (2.00%) high mild
+  6 (6.00%) high severe
+Benchmarking branch_write/branches_64/1000
+Benchmarking branch_write/branches_64/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_64/1000: Collecting 100 samples in estimated 5.0002 s (67k iterations)
+Benchmarking branch_write/branches_64/1000: Analyzing
+branch_write/branches_64/1000
+                        time:   [72.944 µs 73.385 µs 73.962 µs]
+                        thrpt:  [175.14 MiB/s 176.52 MiB/s 177.58 MiB/s]
+Found 12 outliers among 100 measurements (12.00%)
+  7 (7.00%) high mild
+  5 (5.00%) high severe
+Benchmarking branch_write/branches_256/1000
+Benchmarking branch_write/branches_256/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_256/1000: Collecting 100 samples in estimated 5.0044 s (63k iterations)
+Benchmarking branch_write/branches_256/1000: Analyzing
+branch_write/branches_256/1000
+                        time:   [77.461 µs 77.858 µs 78.312 µs]
+                        thrpt:  [182.95 MiB/s 184.02 MiB/s 184.96 MiB/s]
+Found 11 outliers among 100 measurements (11.00%)
+  5 (5.00%) high mild
+  6 (6.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final/current-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final/current-1.txt
new file mode 100644
index 0000000..366ddee
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final/current-1.txt
@@ -0,0 +1,41 @@
+memcap: <=7724 MiB (60% of 12874 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_1/1000
+Benchmarking branch_write/branches_1/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_1/1000: Collecting 100 samples in estimated 5.0021 s (83k iterations)
+Benchmarking branch_write/branches_1/1000: Analyzing
+branch_write/branches_1/1000
+                        time:   [59.783 µs 59.922 µs 60.070 µs]
+                        thrpt:  [188.97 MiB/s 189.44 MiB/s 189.88 MiB/s]
+Found 3 outliers among 100 measurements (3.00%)
+  3 (3.00%) high mild
+Benchmarking branch_write/branches_16/1000
+Benchmarking branch_write/branches_16/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_16/1000: Collecting 100 samples in estimated 5.0037 s (78k iterations)
+Benchmarking branch_write/branches_16/1000: Analyzing
+branch_write/branches_16/1000
+                        time:   [65.118 µs 65.657 µs 66.277 µs]
+                        thrpt:  [181.98 MiB/s 183.70 MiB/s 185.22 MiB/s]
+Found 13 outliers among 100 measurements (13.00%)
+  3 (3.00%) high mild
+  10 (10.00%) high severe
+Benchmarking branch_write/branches_64/1000
+Benchmarking branch_write/branches_64/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_64/1000: Collecting 100 samples in estimated 5.0050 s (67k iterations)
+Benchmarking branch_write/branches_64/1000: Analyzing
+branch_write/branches_64/1000
+                        time:   [74.374 µs 74.917 µs 75.641 µs]
+                        thrpt:  [171.25 MiB/s 172.91 MiB/s 174.17 MiB/s]
+Found 12 outliers among 100 measurements (12.00%)
+  5 (5.00%) high mild
+  7 (7.00%) high severe
+Benchmarking branch_write/branches_256/1000
+Benchmarking branch_write/branches_256/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_256/1000: Collecting 100 samples in estimated 5.0068 s (64k iterations)
+Benchmarking branch_write/branches_256/1000: Analyzing
+branch_write/branches_256/1000
+                        time:   [77.885 µs 78.286 µs 78.737 µs]
+                        thrpt:  [181.96 MiB/s 183.01 MiB/s 183.95 MiB/s]
+Found 12 outliers among 100 measurements (12.00%)
+  6 (6.00%) high mild
+  6 (6.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final/current-2.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final/current-2.txt
new file mode 100644
index 0000000..738c16b
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final/current-2.txt
@@ -0,0 +1,42 @@
+memcap: <=7722 MiB (60% of 12870 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_1/1000
+Benchmarking branch_write/branches_1/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_1/1000: Collecting 100 samples in estimated 5.0020 s (82k iterations)
+Benchmarking branch_write/branches_1/1000: Analyzing
+branch_write/branches_1/1000
+                        time:   [60.243 µs 60.551 µs 60.893 µs]
+                        thrpt:  [186.42 MiB/s 187.47 MiB/s 188.43 MiB/s]
+Found 7 outliers among 100 measurements (7.00%)
+  6 (6.00%) high mild
+  1 (1.00%) high severe
+Benchmarking branch_write/branches_16/1000
+Benchmarking branch_write/branches_16/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_16/1000: Collecting 100 samples in estimated 5.0049 s (78k iterations)
+Benchmarking branch_write/branches_16/1000: Analyzing
+branch_write/branches_16/1000
+                        time:   [64.542 µs 64.981 µs 65.517 µs]
+                        thrpt:  [184.09 MiB/s 185.61 MiB/s 186.87 MiB/s]
+Found 8 outliers among 100 measurements (8.00%)
+  3 (3.00%) high mild
+  5 (5.00%) high severe
+Benchmarking branch_write/branches_64/1000
+Benchmarking branch_write/branches_64/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_64/1000: Collecting 100 samples in estimated 5.0049 s (68k iterations)
+Benchmarking branch_write/branches_64/1000: Analyzing
+branch_write/branches_64/1000
+                        time:   [73.008 µs 73.502 µs 74.114 µs]
+                        thrpt:  [174.78 MiB/s 176.24 MiB/s 177.43 MiB/s]
+Found 5 outliers among 100 measurements (5.00%)
+  4 (4.00%) high mild
+  1 (1.00%) high severe
+Benchmarking branch_write/branches_256/1000
+Benchmarking branch_write/branches_256/1000: Warming up for 3.0000 s
+Benchmarking branch_write/branches_256/1000: Collecting 100 samples in estimated 5.0027 s (64k iterations)
+Benchmarking branch_write/branches_256/1000: Analyzing
+branch_write/branches_256/1000
+                        time:   [78.076 µs 78.990 µs 80.489 µs]
+                        thrpt:  [178.00 MiB/s 181.38 MiB/s 183.50 MiB/s]
+Found 5 outliers among 100 measurements (5.00%)
+  3 (3.00%) high mild
+  2 (2.00%) high severe
+
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+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-util"
+version = "0.1.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c2a7b1c03c876122aa43f3020e6c3c3ee5c05081c9a00739faf7503aeba10d22"
+dependencies = [
+ "windows-sys",
+]
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
+[[package]]
+name = "windows-link"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f0805222e57f7521d6a62e36fa9163bc891acd422f971defe97d64e70d0a4fe5"
+
+[[package]]
+name = "windows-sys"
+version = "0.61.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ae137229bcbd6cdf0f7b80a31df61766145077ddf49416a728b02cb3921ff3fc"
+dependencies = [
+ "windows-link",
+]
+
+[[package]]
+name = "zerocopy"
+version = "0.8.59"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6df92bf3d9227be3d53173901ddbffac2babc27ae50f397776ffd6dc33f800cb"
+dependencies = [
+ "zerocopy-derive",
+]
+
+[[package]]
+name = "zerocopy-derive"
+version = "0.8.59"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac4f328cf2f05d084e496c3e9c3f33ed0a183656a16e1fcec4d464d8373aec82"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.119",
+]
+
+[[package]]
+name = "zmij"
+version = "1.0.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "29666d0abbfad1e3dc4dcf6144730dd3a3ab225bbbdac83319345b1b44ccfc1b"
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final/harness.rs b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final/harness.rs
new file mode 100644
index 0000000..29b2c6a
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final/harness.rs
@@ -0,0 +1,77 @@
+use criterion::{
+    criterion_group, criterion_main, BenchmarkId, Criterion, SamplingMode, Throughput,
+};
+use polyxml::schema::ModelSchema;
+use polyxml::schema_parser::XsdParser;
+use polyxml::{deserialize, serialize, PolyValue};
+use std::{hint::black_box, sync::Arc};
+
+fn fixture(branches: usize, count: usize) -> (Arc<ModelSchema>, Vec<u8>) {
+    let declarations = (0..branches)
+        .map(|i| format!(r#"<xs:element name="B{i}" type="xs:int"/>"#))
+        .collect::<String>();
+    let xsd = format!(
+        r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"><xs:element name="Root"><xs:complexType mixed="true"><xs:choice minOccurs="0" maxOccurs="unbounded">{declarations}</xs:choice></xs:complexType></xs:element></xs:schema>"#
+    );
+    let ir = XsdParser::new().parse_str(&xsd).unwrap();
+    let schema = ModelSchema::from_ir(&ir, Some("Root")).unwrap();
+    let body = (0..count)
+        .map(|i| format!("<B{}>{i}</B{}>", i % branches, i % branches))
+        .collect::<String>();
+    let xml = format!("<Root>{body}</Root>").into_bytes();
+    let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+    let mixed = schema.mixed_content.as_ref().unwrap();
+    let field = &schema.fields[mixed.items_index].name;
+    let items = value.get(field).and_then(PolyValue::as_list).unwrap();
+    assert_eq!(items.len(), count);
+    for (i, item) in items.iter().enumerate() {
+        assert_eq!(item.get("value"), Some(&PolyValue::Int(i as i64)));
+        let kind = item.get("kind").and_then(PolyValue::as_str).unwrap();
+        let branch = mixed
+            .branches
+            .iter()
+            .find(|b| b.variant_name == kind)
+            .unwrap();
+        assert_eq!(branch.xml_name, format!("B{}", i % branches).as_bytes());
+    }
+    let output = serialize("Root", &value, &schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+    let output = serialize("Sensor", &value, &schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    (schema, xml)
+}
+
+fn benchmarks(c: &mut Criterion) {
+    for operation in ["branch_read", "branch_write"] {
+        let mut group = c.benchmark_group(operation);
+        group.sampling_mode(SamplingMode::Flat);
+        for branches in [1, 16, 64, 256] {
+            for count in [1, 1000] {
+                let (schema, xml) = fixture(branches, count);
+                let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+                group.throughput(Throughput::Bytes(xml.len() as u64));
+                group.bench_with_input(
+                    BenchmarkId::new(format!("branches_{branches}"), count),
+                    &count,
+                    |b, _| {
+                        b.iter(|| {
+                            if operation == "branch_read" {
+                                black_box(
+                                    deserialize(black_box(&xml), Arc::clone(&schema)).unwrap(),
+                                );
+                            } else {
+                                black_box(
+                                    serialize("Root", black_box(&value), &schema, None).unwrap(),
+                                );
+                            }
+                        });
+                    },
+                );
+            }
+        }
+        group.finish();
+    }
+}
+criterion_group!(benches, benchmarks);
+criterion_main!(benches);
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final/metadata.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final/metadata.json
new file mode 100644
index 0000000..349f2e0
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final/metadata.json
@@ -0,0 +1,19 @@
+{
+  "revisions": {
+    "baseline": "1819c91b0808b9242c642d82350d2b657b60108c",
+    "current": "d3bf1728be1d265b6b5d317946492cec9b4a6f8c"
+  },
+  "core_status": {
+    "baseline": "",
+    "current": ""
+  },
+  "sample_size": 100,
+  "warmup_seconds": 3.0,
+  "measurement_seconds": 5.0,
+  "rounds": 3,
+  "filter": "^branch_write/.*/1000$",
+  "order": "alternate baseline/current per round",
+  "os": "Linux-6.18.40.1-microsoft-standard-WSL2-x86_64-with-glibc2.43",
+  "cpu": "11th Gen Intel(R) Core(TM) i5-11600K @ 3.90GHz",
+  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)\nbinary: rustc\ncommit-hash: b940084d7eb6a299eb4bfeb8e34901bc051e7ac4\ncommit-date: 2026-09-28\nhost: x86_64-unknown-linux-gnu\nrelease: 1.99.0\nLLVM version: 23.1.1\n"
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final/summary.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final/summary.json
new file mode 100644
index 0000000..a8c2225
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-final/summary.json
@@ -0,0 +1,286 @@
+{
+  "branch_write/branches_1/1000": {
+    "baseline_ns": 64850.10155216284,
+    "candidate_ns": 59921.58510843375,
+    "delta_percent": -7.599859253519892,
+    "speedup": 1.082249433735948,
+    "process_deltas_percent": [
+      -6.754376273804342,
+      -7.942210050892895,
+      -6.628737437630816
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 63448.159709450796,
+            "upper_bound": 63820.914584610466
+          },
+          "point_estimate": 63622.48621966793,
+          "standard_error": 95.66682800525312
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 63952.476813157904,
+            "upper_bound": 66655.38305822368
+          },
+          "point_estimate": 65091.27053947371,
+          "standard_error": 707.9121794497387
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 64443.85663358776,
+            "upper_bound": 65339.539052480905
+          },
+          "point_estimate": 64850.10155216284,
+          "standard_error": 229.63200395663455
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 58968.31735444178,
+            "upper_bound": 59745.64151080432
+          },
+          "point_estimate": 59325.18410564224,
+          "standard_error": 199.3848496402265
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 59783.3114120482,
+            "upper_bound": 60069.66440512051
+          },
+          "point_estimate": 59921.58510843375,
+          "standard_error": 73.38287397502054
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 60242.51625576456,
+            "upper_bound": 60893.21378094663
+          },
+          "point_estimate": 60551.358592233024,
+          "standard_error": 166.18158932926747
+        }
+      ]
+    }
+  },
+  "branch_write/branches_16/1000": {
+    "baseline_ns": 69575.24784122565,
+    "candidate_ns": 65136.322390438254,
+    "delta_percent": -6.3800354127623855,
+    "speedup": 1.0681482356983514,
+    "process_deltas_percent": [
+      -6.3800354127623855,
+      -4.555431372015284,
+      -6.998377341787087
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 68882.39630292481,
+            "upper_bound": 70520.33586072424
+          },
+          "point_estimate": 69575.24784122565,
+          "standard_error": 423.826429731008
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 68493.37610372712,
+            "upper_bound": 69129.32160935302
+          },
+          "point_estimate": 68790.23735583686,
+          "standard_error": 163.2414480732288
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 69460.37044797486,
+            "upper_bound": 70331.15789664806
+          },
+          "point_estimate": 69870.56087988826,
+          "standard_error": 223.09309012158243
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 64883.13966699868,
+            "upper_bound": 65449.17750830015
+          },
+          "point_estimate": 65136.322390438254,
+          "standard_error": 145.40348654366386
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 65117.81895527673,
+            "upper_bound": 66277.32808043761
+          },
+          "point_estimate": 65656.54530244529,
+          "standard_error": 297.0259085013548
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 64542.095838896,
+            "upper_bound": 65517.368249358144
+          },
+          "point_estimate": 64980.75537869061,
+          "standard_error": 249.83641731445198
+        }
+      ]
+    }
+  },
+  "branch_write/branches_256/1000": {
+    "baseline_ns": 169214.49481481485,
+    "candidate_ns": 78285.83989045383,
+    "delta_percent": -53.73573642368618,
+    "speedup": 2.1614955533669744,
+    "process_deltas_percent": [
+      -53.752025132986205,
+      -53.834784376792186,
+      -53.319536227318444
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 167746.4541680887,
+            "upper_bound": 169067.35135494886
+          },
+          "point_estimate": 168348.49215017058,
+          "standard_error": 337.62991393279503
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 168197.61164695938,
+            "upper_bound": 171353.573441723
+          },
+          "point_estimate": 169577.54628378383,
+          "standard_error": 811.1997512605842
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 168403.18921633004,
+            "upper_bound": 170156.0153417509
+          },
+          "point_estimate": 169214.49481481485,
+          "standard_error": 449.54565854234687
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 77461.22049683542,
+            "upper_bound": 78311.99828599686
+          },
+          "point_estimate": 77857.76833860758,
+          "standard_error": 218.5069712040118
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 77885.36369874801,
+            "upper_bound": 78736.50291236302
+          },
+          "point_estimate": 78285.83989045383,
+          "standard_error": 217.01890276631906
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 78075.74189174453,
+            "upper_bound": 80489.31439213392
+          },
+          "point_estimate": 78990.11095015577,
+          "standard_error": 661.1858207069032
+        }
+      ]
+    }
+  },
+  "branch_write/branches_64/1000": {
+    "baseline_ns": 99859.15936758899,
+    "candidate_ns": 73501.68615497078,
+    "delta_percent": -26.39464760122242,
+    "speedup": 1.3585968511939464,
+    "process_deltas_percent": [
+      -27.24632835451748,
+      -24.39289202695378,
+      -26.39464760122242
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 100174.43715543258,
+            "upper_bound": 101688.03519567403
+          },
+          "point_estimate": 100867.46060362172,
+          "standard_error": 387.8381250639527
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 98635.11592952674,
+            "upper_bound": 99605.64105761319
+          },
+          "point_estimate": 99087.12668724277,
+          "standard_error": 248.26096732236073
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 99337.80651235179,
+            "upper_bound": 100583.65524555334
+          },
+          "point_estimate": 99859.15936758899,
+          "standard_error": 323.1065668199333
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 72944.09634658248,
+            "upper_bound": 73961.84507986624
+          },
+          "point_estimate": 73384.78108469538,
+          "standard_error": 262.761501262398
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 74374.4531036404,
+            "upper_bound": 75641.28974294204
+          },
+          "point_estimate": 74916.91086181274,
+          "standard_error": 326.7224080108236
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 73008.15782602338,
+            "upper_bound": 74113.84151754389
+          },
+          "point_estimate": 73501.68615497078,
+          "standard_error": 282.8087523101822
+        }
+      ]
+    }
+  }
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-power-two/baseline-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-power-two/baseline-0.txt
new file mode 100644
index 0000000..f6f6217
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-power-two/baseline-0.txt
@@ -0,0 +1,22 @@
+memcap: <=7656 MiB (60% of 12760 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_64/1024
+Benchmarking branch_write/branches_64/1024: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/1024: Collecting 50 samples in estimated 2.0011 s (19k iterations)
+Benchmarking branch_write/branches_64/1024: Analyzing
+branch_write/branches_64/1024
+                        time:   [104.70 µs 105.51 µs 106.59 µs]
+                        thrpt:  [124.75 MiB/s 126.03 MiB/s 127.00 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  3 (6.00%) high mild
+  2 (4.00%) high severe
+Benchmarking branch_write/branches_256/1024
+Benchmarking branch_write/branches_256/1024: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/1024: Collecting 50 samples in estimated 2.0010 s (11k iterations)
+Benchmarking branch_write/branches_256/1024: Analyzing
+branch_write/branches_256/1024
+                        time:   [181.19 µs 182.09 µs 183.40 µs]
+                        thrpt:  [80.240 MiB/s 80.819 MiB/s 81.220 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  2 (4.00%) high mild
+  2 (4.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-power-two/baseline-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-power-two/baseline-1.txt
new file mode 100644
index 0000000..d114dd1
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-power-two/baseline-1.txt
@@ -0,0 +1,22 @@
+memcap: <=7704 MiB (60% of 12841 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_64/1024
+Benchmarking branch_write/branches_64/1024: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/1024: Collecting 50 samples in estimated 2.0007 s (19k iterations)
+Benchmarking branch_write/branches_64/1024: Analyzing
+branch_write/branches_64/1024
+                        time:   [105.94 µs 107.04 µs 108.70 µs]
+                        thrpt:  [122.33 MiB/s 124.22 MiB/s 125.52 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  1 (2.00%) high mild
+  3 (6.00%) high severe
+Benchmarking branch_write/branches_256/1024
+Benchmarking branch_write/branches_256/1024: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/1024: Collecting 50 samples in estimated 2.0038 s (11k iterations)
+Benchmarking branch_write/branches_256/1024: Analyzing
+branch_write/branches_256/1024
+                        time:   [181.44 µs 182.18 µs 183.08 µs]
+                        thrpt:  [80.380 MiB/s 80.776 MiB/s 81.109 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  1 (2.00%) high mild
+  4 (8.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-power-two/baseline-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-power-two/baseline-build.txt
new file mode 100644
index 0000000..34346bb
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-power-two/baseline-build.txt
@@ -0,0 +1,3 @@
+memcap: <=7690 MiB (60% of 12818 MiB available) [systemd MemoryMax, swap off]
+   Compiling core-regression v0.0.0 (/home/bailey/github/polyxml-mixed-index/benchmarks/rust-xml-regression/target/core-baseline)
+    Finished `bench` profile [optimized] target(s) in 2.73s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-power-two/baseline.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-power-two/baseline.lock
new file mode 100644
index 0000000..78a11b2
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-power-two/baseline.lock
@@ -0,0 +1,633 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "aho-corasick"
+version = "1.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c982642fa9e8606056828ee9a8505737230110bb1099153c79efe865c59d12ba"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "alloca"
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index 0000000..4fc5fa3
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-power-two/criterion-results.tar.gz b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-power-two/criterion-results.tar.gz
new file mode 100644
index 0000000..3b5ed55
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-power-two/current-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-power-two/current-0.txt
new file mode 100644
index 0000000..692bdb5
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-power-two/current-0.txt
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+memcap: <=7686 MiB (60% of 12810 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_64/1024
+Benchmarking branch_write/branches_64/1024: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/1024: Collecting 50 samples in estimated 2.0016 s (26k iterations)
+Benchmarking branch_write/branches_64/1024: Analyzing
+branch_write/branches_64/1024
+                        time:   [75.101 µs 76.041 µs 77.222 µs]
+                        thrpt:  [172.19 MiB/s 174.87 MiB/s 177.06 MiB/s]
+Found 9 outliers among 50 measurements (18.00%)
+  2 (4.00%) high mild
+  7 (14.00%) high severe
+Benchmarking branch_write/branches_256/1024
+Benchmarking branch_write/branches_256/1024: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/1024: Collecting 50 samples in estimated 2.0003 s (24k iterations)
+Benchmarking branch_write/branches_256/1024: Analyzing
+branch_write/branches_256/1024
+                        time:   [80.753 µs 81.027 µs 81.353 µs]
+                        thrpt:  [180.89 MiB/s 181.62 MiB/s 182.24 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  2 (4.00%) high mild
+  1 (2.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-power-two/current-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-power-two/current-1.txt
new file mode 100644
index 0000000..2c3b142
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-power-two/current-1.txt
@@ -0,0 +1,20 @@
+memcap: <=7703 MiB (60% of 12838 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_64/1024
+Benchmarking branch_write/branches_64/1024: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/1024: Collecting 50 samples in estimated 2.0004 s (26k iterations)
+Benchmarking branch_write/branches_64/1024: Analyzing
+branch_write/branches_64/1024
+                        time:   [77.682 µs 79.885 µs 82.477 µs]
+                        thrpt:  [161.22 MiB/s 166.45 MiB/s 171.17 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  3 (6.00%) high mild
+Benchmarking branch_write/branches_256/1024
+Benchmarking branch_write/branches_256/1024: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/1024: Collecting 50 samples in estimated 2.0029 s (25k iterations)
+Benchmarking branch_write/branches_256/1024: Analyzing
+branch_write/branches_256/1024
+                        time:   [83.088 µs 84.923 µs 86.989 µs]
+                        thrpt:  [169.17 MiB/s 173.29 MiB/s 177.11 MiB/s]
+Found 2 outliers among 50 measurements (4.00%)
+  2 (4.00%) high mild
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-power-two/current-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-power-two/current-build.txt
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index 0000000..fc3618f
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-power-two/current-build.txt
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+   Compiling core-regression v0.0.0 (/home/bailey/github/polyxml-mixed-index/benchmarks/rust-xml-regression/target/core-current)
+    Finished `bench` profile [optimized] target(s) in 26.81s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-power-two/current.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-power-two/current.lock
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-power-two/harness.rs b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-power-two/harness.rs
new file mode 100644
index 0000000..2f8360e
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-power-two/harness.rs
@@ -0,0 +1,77 @@
+use criterion::{
+    criterion_group, criterion_main, BenchmarkId, Criterion, SamplingMode, Throughput,
+};
+use polyxml::schema::ModelSchema;
+use polyxml::schema_parser::XsdParser;
+use polyxml::{deserialize, serialize, PolyValue};
+use std::{hint::black_box, sync::Arc};
+
+fn fixture(branches: usize, count: usize) -> (Arc<ModelSchema>, Vec<u8>) {
+    let declarations = (0..branches)
+        .map(|i| format!(r#"<xs:element name="B{i}" type="xs:int"/>"#))
+        .collect::<String>();
+    let xsd = format!(
+        r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"><xs:element name="Root"><xs:complexType mixed="true"><xs:choice minOccurs="0" maxOccurs="unbounded">{declarations}</xs:choice></xs:complexType></xs:element></xs:schema>"#
+    );
+    let ir = XsdParser::new().parse_str(&xsd).unwrap();
+    let schema = ModelSchema::from_ir(&ir, Some("Root")).unwrap();
+    let body = (0..count)
+        .map(|i| format!("<B{}>{i}</B{}>", i % branches, i % branches))
+        .collect::<String>();
+    let xml = format!("<Root>{body}</Root>").into_bytes();
+    let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+    let mixed = schema.mixed_content.as_ref().unwrap();
+    let field = &schema.fields[mixed.items_index].name;
+    let items = value.get(field).and_then(PolyValue::as_list).unwrap();
+    assert_eq!(items.len(), count);
+    for (i, item) in items.iter().enumerate() {
+        assert_eq!(item.get("value"), Some(&PolyValue::Int(i as i64)));
+        let kind = item.get("kind").and_then(PolyValue::as_str).unwrap();
+        let branch = mixed
+            .branches
+            .iter()
+            .find(|b| b.variant_name == kind)
+            .unwrap();
+        assert_eq!(branch.xml_name, format!("B{}", i % branches).as_bytes());
+    }
+    let output = serialize("Root", &value, &schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+    let output = serialize("Sensor", &value, &schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    (schema, xml)
+}
+
+fn benchmarks(c: &mut Criterion) {
+    for operation in ["branch_read", "branch_write"] {
+        let mut group = c.benchmark_group(operation);
+        group.sampling_mode(SamplingMode::Flat);
+        for branches in [64, 256] {
+            for count in [1024] {
+                let (schema, xml) = fixture(branches, count);
+                let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+                group.throughput(Throughput::Bytes(xml.len() as u64));
+                group.bench_with_input(
+                    BenchmarkId::new(format!("branches_{branches}"), count),
+                    &count,
+                    |b, _| {
+                        b.iter(|| {
+                            if operation == "branch_read" {
+                                black_box(
+                                    deserialize(black_box(&xml), Arc::clone(&schema)).unwrap(),
+                                );
+                            } else {
+                                black_box(
+                                    serialize("Root", black_box(&value), &schema, None).unwrap(),
+                                );
+                            }
+                        });
+                    },
+                );
+            }
+        }
+        group.finish();
+    }
+}
+criterion_group!(benches, benchmarks);
+criterion_main!(benches);
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-power-two/metadata.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-power-two/metadata.json
new file mode 100644
index 0000000..bb748c9
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-power-two/metadata.json
@@ -0,0 +1,19 @@
+{
+  "revisions": {
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+    "current": "58cb346f964b5196dfad62e8a62a8aa4beb9beef"
+  },
+  "core_status": {
+    "baseline": "",
+    "current": ""
+  },
+  "sample_size": 50,
+  "warmup_seconds": 1.0,
+  "measurement_seconds": 2.0,
+  "rounds": 2,
+  "filter": "^branch_write/",
+  "order": "alternate baseline/current per round",
+  "os": "Linux-6.18.40.1-microsoft-standard-WSL2-x86_64-with-glibc2.43",
+  "cpu": "11th Gen Intel(R) Core(TM) i5-11600K @ 3.90GHz",
+  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)\nbinary: rustc\ncommit-hash: b940084d7eb6a299eb4bfeb8e34901bc051e7ac4\ncommit-date: 2026-09-28\nhost: x86_64-unknown-linux-gnu\nrelease: 1.99.0\nLLVM version: 23.1.1\n"
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-power-two/summary.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-power-two/summary.json
new file mode 100644
index 0000000..ed8b6ed
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-power-two/summary.json
@@ -0,0 +1,106 @@
+{
+  "branch_write/branches_256/1024": {
+    "baseline_ns": 182135.43876018177,
+    "candidate_ns": 82975.3623621496,
+    "delta_percent": -54.44304363446617,
+    "speedup": 2.195054454420382,
+    "process_deltas_percent": [
+      -55.50073509603166,
+      -53.38591829127686
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 181188.38825,
+            "upper_bound": 183401.41112155953
+          },
+          "point_estimate": 182086.68266055046,
+          "standard_error": 579.8578447727085
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 181437.43196261683,
+            "upper_bound": 183082.44314485983
+          },
+          "point_estimate": 182184.19485981308,
+          "standard_error": 421.6982606845775
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 80753.11235460252,
+            "upper_bound": 81353.09379393305
+          },
+          "point_estimate": 81027.23527196652,
+          "standard_error": 153.18990566657234
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 83088.35773732251,
+            "upper_bound": 86989.04748073022
+          },
+          "point_estimate": 84923.48945233267,
+          "standard_error": 995.1150480515694
+        }
+      ]
+    }
+  },
+  "branch_write/branches_64/1024": {
+    "baseline_ns": 106275.0213085819,
+    "candidate_ns": 77963.22984221365,
+    "delta_percent": -26.64011836249053,
+    "speedup": 1.3631428754769042,
+    "process_deltas_percent": [
+      -27.928703064860894,
+      -25.36999075936984
+    ],
+    "process_estimates": {
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+        {
+          "confidence_interval": {
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+            "lower_bound": 104698.4370566038,
+            "upper_bound": 106589.19406603779
+          },
+          "point_estimate": 105508.41358490569,
+          "standard_error": 489.6289315892407
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+        {
+          "confidence_interval": {
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+            "lower_bound": 105939.35688440864,
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+        }
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+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-screen/baseline-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-screen/baseline-0.txt
new file mode 100644
index 0000000..8764cd6
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-screen/baseline-0.txt
@@ -0,0 +1,41 @@
+memcap: <=7676 MiB (60% of 12794 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_1/1000
+Benchmarking branch_write/branches_1/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_1/1000: Collecting 50 samples in estimated 2.0012 s (30k iterations)
+Benchmarking branch_write/branches_1/1000: Analyzing
+branch_write/branches_1/1000
+                        time:   [63.801 µs 64.089 µs 64.444 µs]
+                        thrpt:  [176.15 MiB/s 177.12 MiB/s 177.92 MiB/s]
+Found 2 outliers among 50 measurements (4.00%)
+  2 (4.00%) high severe
+Benchmarking branch_write/branches_16/1000
+Benchmarking branch_write/branches_16/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_16/1000: Collecting 50 samples in estimated 2.0031 s (28k iterations)
+Benchmarking branch_write/branches_16/1000: Analyzing
+branch_write/branches_16/1000
+                        time:   [69.570 µs 70.870 µs 72.371 µs]
+                        thrpt:  [166.66 MiB/s 170.19 MiB/s 173.37 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  2 (4.00%) high mild
+  5 (10.00%) high severe
+Benchmarking branch_write/branches_64/1000
+Benchmarking branch_write/branches_64/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/1000: Collecting 50 samples in estimated 2.0038 s (20k iterations)
+Benchmarking branch_write/branches_64/1000: Analyzing
+branch_write/branches_64/1000
+                        time:   [99.923 µs 101.25 µs 102.86 µs]
+                        thrpt:  [125.94 MiB/s 127.94 MiB/s 129.64 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  1 (2.00%) high mild
+  5 (10.00%) high severe
+Benchmarking branch_write/branches_256/1000
+Benchmarking branch_write/branches_256/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/1000: Collecting 50 samples in estimated 2.0066 s (12k iterations)
+Benchmarking branch_write/branches_256/1000: Analyzing
+branch_write/branches_256/1000
+                        time:   [168.95 µs 169.85 µs 170.98 µs]
+                        thrpt:  [83.791 MiB/s 84.349 MiB/s 84.799 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  1 (2.00%) high mild
+  4 (8.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-screen/baseline-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-screen/baseline-1.txt
new file mode 100644
index 0000000..42b62e2
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-screen/baseline-1.txt
@@ -0,0 +1,42 @@
+memcap: <=7727 MiB (60% of 12879 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_1/1000
+Benchmarking branch_write/branches_1/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_1/1000: Collecting 50 samples in estimated 2.0012 s (31k iterations)
+Benchmarking branch_write/branches_1/1000: Analyzing
+branch_write/branches_1/1000
+                        time:   [63.572 µs 64.048 µs 64.646 µs]
+                        thrpt:  [175.60 MiB/s 177.24 MiB/s 178.56 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  2 (4.00%) high mild
+  4 (8.00%) high severe
+Benchmarking branch_write/branches_16/1000
+Benchmarking branch_write/branches_16/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_16/1000: Collecting 50 samples in estimated 2.0030 s (29k iterations)
+Benchmarking branch_write/branches_16/1000: Analyzing
+branch_write/branches_16/1000
+                        time:   [69.743 µs 70.263 µs 70.900 µs]
+                        thrpt:  [170.11 MiB/s 171.66 MiB/s 172.94 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  1 (2.00%) high mild
+  4 (8.00%) high severe
+Benchmarking branch_write/branches_64/1000
+Benchmarking branch_write/branches_64/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/1000: Collecting 50 samples in estimated 2.0038 s (20k iterations)
+Benchmarking branch_write/branches_64/1000: Analyzing
+branch_write/branches_64/1000
+                        time:   [99.115 µs 99.379 µs 99.680 µs]
+                        thrpt:  [129.95 MiB/s 130.35 MiB/s 130.69 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  3 (6.00%) high mild
+  1 (2.00%) high severe
+Benchmarking branch_write/branches_256/1000
+Benchmarking branch_write/branches_256/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/1000: Collecting 50 samples in estimated 2.0084 s (12k iterations)
+Benchmarking branch_write/branches_256/1000: Analyzing
+branch_write/branches_256/1000
+                        time:   [169.43 µs 172.43 µs 177.36 µs]
+                        thrpt:  [80.778 MiB/s 83.089 MiB/s 84.560 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  3 (6.00%) high mild
+  3 (6.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-screen/baseline-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-screen/baseline-build.txt
new file mode 100644
index 0000000..f4536f6
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-screen/baseline-build.txt
@@ -0,0 +1,3 @@
+memcap: <=7734 MiB (60% of 12890 MiB available) [systemd MemoryMax, swap off]
+   Compiling core-regression v0.0.0 (/home/bailey/github/polyxml-mixed-index/benchmarks/rust-xml-regression/target/core-baseline)
+    Finished `bench` profile [optimized] target(s) in 2.88s
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new file mode 100644
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new file mode 100644
index 0000000..88bc25c
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-screen/criterion-SHA256SUMS
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-screen/criterion-results.tar.gz b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-screen/criterion-results.tar.gz
new file mode 100644
index 0000000..195a242
Binary files /dev/null and b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-screen/criterion-results.tar.gz differ
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-screen/current-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-screen/current-0.txt
new file mode 100644
index 0000000..fc7b5ac
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-screen/current-0.txt
@@ -0,0 +1,42 @@
+memcap: <=7694 MiB (60% of 12823 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_1/1000
+Benchmarking branch_write/branches_1/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_1/1000: Collecting 50 samples in estimated 2.0013 s (33k iterations)
+Benchmarking branch_write/branches_1/1000: Analyzing
+branch_write/branches_1/1000
+                        time:   [60.091 µs 60.727 µs 61.486 µs]
+                        thrpt:  [184.62 MiB/s 186.93 MiB/s 188.91 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  2 (4.00%) high mild
+  5 (10.00%) high severe
+Benchmarking branch_write/branches_16/1000
+Benchmarking branch_write/branches_16/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_16/1000: Collecting 50 samples in estimated 2.0024 s (31k iterations)
+Benchmarking branch_write/branches_16/1000: Analyzing
+branch_write/branches_16/1000
+                        time:   [63.893 µs 64.257 µs 64.742 µs]
+                        thrpt:  [186.30 MiB/s 187.70 MiB/s 188.77 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  2 (4.00%) high mild
+  3 (6.00%) high severe
+Benchmarking branch_write/branches_64/1000
+Benchmarking branch_write/branches_64/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/1000: Collecting 50 samples in estimated 2.0028 s (28k iterations)
+Benchmarking branch_write/branches_64/1000: Analyzing
+branch_write/branches_64/1000
+                        time:   [72.171 µs 72.502 µs 72.893 µs]
+                        thrpt:  [177.71 MiB/s 178.67 MiB/s 179.49 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  1 (2.00%) high mild
+  2 (4.00%) high severe
+Benchmarking branch_write/branches_256/1000
+Benchmarking branch_write/branches_256/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/1000: Collecting 50 samples in estimated 2.0018 s (26k iterations)
+Benchmarking branch_write/branches_256/1000: Analyzing
+branch_write/branches_256/1000
+                        time:   [78.083 µs 80.055 µs 82.663 µs]
+                        thrpt:  [173.32 MiB/s 178.96 MiB/s 183.48 MiB/s]
+Found 8 outliers among 50 measurements (16.00%)
+  5 (10.00%) high mild
+  3 (6.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-screen/current-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-screen/current-1.txt
new file mode 100644
index 0000000..e318da8
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-screen/current-1.txt
@@ -0,0 +1,42 @@
+memcap: <=7722 MiB (60% of 12870 MiB available) [systemd MemoryMax, swap off]
+Benchmarking branch_write/branches_1/1000
+Benchmarking branch_write/branches_1/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_1/1000: Collecting 50 samples in estimated 2.0022 s (31k iterations)
+Benchmarking branch_write/branches_1/1000: Analyzing
+branch_write/branches_1/1000
+                        time:   [61.189 µs 61.698 µs 62.354 µs]
+                        thrpt:  [182.05 MiB/s 183.99 MiB/s 185.52 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  2 (4.00%) high mild
+  4 (8.00%) high severe
+Benchmarking branch_write/branches_16/1000
+Benchmarking branch_write/branches_16/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_16/1000: Collecting 50 samples in estimated 2.0022 s (30k iterations)
+Benchmarking branch_write/branches_16/1000: Analyzing
+branch_write/branches_16/1000
+                        time:   [64.293 µs 64.886 µs 65.663 µs]
+                        thrpt:  [183.68 MiB/s 185.88 MiB/s 187.60 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  3 (6.00%) high mild
+  4 (8.00%) high severe
+Benchmarking branch_write/branches_64/1000
+Benchmarking branch_write/branches_64/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_64/1000: Collecting 50 samples in estimated 2.0025 s (27k iterations)
+Benchmarking branch_write/branches_64/1000: Analyzing
+branch_write/branches_64/1000
+                        time:   [73.081 µs 73.549 µs 74.112 µs]
+                        thrpt:  [174.79 MiB/s 176.12 MiB/s 177.25 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  2 (4.00%) high mild
+  3 (6.00%) high severe
+Benchmarking branch_write/branches_256/1000
+Benchmarking branch_write/branches_256/1000: Warming up for 1.0000 s
+Benchmarking branch_write/branches_256/1000: Collecting 50 samples in estimated 2.0030 s (25k iterations)
+Benchmarking branch_write/branches_256/1000: Analyzing
+branch_write/branches_256/1000
+                        time:   [77.565 µs 77.913 µs 78.308 µs]
+                        thrpt:  [182.96 MiB/s 183.88 MiB/s 184.71 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  3 (6.00%) high mild
+  1 (2.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-screen/current-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-screen/current-build.txt
new file mode 100644
index 0000000..29edb09
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-screen/current-build.txt
@@ -0,0 +1,4 @@
+memcap: <=7693 MiB (60% of 12822 MiB available) [systemd MemoryMax, swap off]
+   Compiling polyxml v0.34.6 (/home/bailey/github/polyxml-mixed-index/crates/polyxml-core)
+   Compiling core-regression v0.0.0 (/home/bailey/github/polyxml-mixed-index/benchmarks/rust-xml-regression/target/core-current)
+    Finished `bench` profile [optimized] target(s) in 26.98s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-screen/current.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-screen/current.lock
new file mode 100644
index 0000000..78a11b2
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-screen/current.lock
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-screen/harness.rs b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-screen/harness.rs
new file mode 100644
index 0000000..29b2c6a
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-screen/harness.rs
@@ -0,0 +1,77 @@
+use criterion::{
+    criterion_group, criterion_main, BenchmarkId, Criterion, SamplingMode, Throughput,
+};
+use polyxml::schema::ModelSchema;
+use polyxml::schema_parser::XsdParser;
+use polyxml::{deserialize, serialize, PolyValue};
+use std::{hint::black_box, sync::Arc};
+
+fn fixture(branches: usize, count: usize) -> (Arc<ModelSchema>, Vec<u8>) {
+    let declarations = (0..branches)
+        .map(|i| format!(r#"<xs:element name="B{i}" type="xs:int"/>"#))
+        .collect::<String>();
+    let xsd = format!(
+        r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"><xs:element name="Root"><xs:complexType mixed="true"><xs:choice minOccurs="0" maxOccurs="unbounded">{declarations}</xs:choice></xs:complexType></xs:element></xs:schema>"#
+    );
+    let ir = XsdParser::new().parse_str(&xsd).unwrap();
+    let schema = ModelSchema::from_ir(&ir, Some("Root")).unwrap();
+    let body = (0..count)
+        .map(|i| format!("<B{}>{i}</B{}>", i % branches, i % branches))
+        .collect::<String>();
+    let xml = format!("<Root>{body}</Root>").into_bytes();
+    let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+    let mixed = schema.mixed_content.as_ref().unwrap();
+    let field = &schema.fields[mixed.items_index].name;
+    let items = value.get(field).and_then(PolyValue::as_list).unwrap();
+    assert_eq!(items.len(), count);
+    for (i, item) in items.iter().enumerate() {
+        assert_eq!(item.get("value"), Some(&PolyValue::Int(i as i64)));
+        let kind = item.get("kind").and_then(PolyValue::as_str).unwrap();
+        let branch = mixed
+            .branches
+            .iter()
+            .find(|b| b.variant_name == kind)
+            .unwrap();
+        assert_eq!(branch.xml_name, format!("B{}", i % branches).as_bytes());
+    }
+    let output = serialize("Root", &value, &schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+    let output = serialize("Sensor", &value, &schema, None).unwrap();
+    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+    (schema, xml)
+}
+
+fn benchmarks(c: &mut Criterion) {
+    for operation in ["branch_read", "branch_write"] {
+        let mut group = c.benchmark_group(operation);
+        group.sampling_mode(SamplingMode::Flat);
+        for branches in [1, 16, 64, 256] {
+            for count in [1, 1000] {
+                let (schema, xml) = fixture(branches, count);
+                let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+                group.throughput(Throughput::Bytes(xml.len() as u64));
+                group.bench_with_input(
+                    BenchmarkId::new(format!("branches_{branches}"), count),
+                    &count,
+                    |b, _| {
+                        b.iter(|| {
+                            if operation == "branch_read" {
+                                black_box(
+                                    deserialize(black_box(&xml), Arc::clone(&schema)).unwrap(),
+                                );
+                            } else {
+                                black_box(
+                                    serialize("Root", black_box(&value), &schema, None).unwrap(),
+                                );
+                            }
+                        });
+                    },
+                );
+            }
+        }
+        group.finish();
+    }
+}
+criterion_group!(benches, benchmarks);
+criterion_main!(benches);
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-screen/metadata.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-screen/metadata.json
new file mode 100644
index 0000000..9c8d89c
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-screen/metadata.json
@@ -0,0 +1,19 @@
+{
+  "revisions": {
+    "baseline": "1819c91b0808b9242c642d82350d2b657b60108c",
+    "current": "6965d332c428025b93b4478bd1ad2d6ce03abe40"
+  },
+  "core_status": {
+    "baseline": "",
+    "current": ""
+  },
+  "sample_size": 50,
+  "warmup_seconds": 1.0,
+  "measurement_seconds": 2.0,
+  "rounds": 2,
+  "filter": "^branch_write/.*/1000$",
+  "order": "alternate baseline/current per round",
+  "os": "Linux-6.18.40.1-microsoft-standard-WSL2-x86_64-with-glibc2.43",
+  "cpu": "11th Gen Intel(R) Core(TM) i5-11600K @ 3.90GHz",
+  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)\nbinary: rustc\ncommit-hash: b940084d7eb6a299eb4bfeb8e34901bc051e7ac4\ncommit-date: 2026-09-28\nhost: x86_64-unknown-linux-gnu\nrelease: 1.99.0\nLLVM version: 23.1.1\n"
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-screen/summary.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-screen/summary.json
new file mode 100644
index 0000000..4ece130
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-screen/summary.json
@@ -0,0 +1,210 @@
+{
+  "branch_write/branches_1/1000": {
+    "baseline_ns": 64068.373261568966,
+    "candidate_ns": 61212.63413020503,
+    "delta_percent": -4.457330483021549,
+    "speedup": 1.0466527731070927,
+    "process_deltas_percent": [
+      -5.245049999132312,
+      -3.6691106923678496
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 63800.7358121911,
+            "upper_bound": 64443.595415980235
+          },
+          "point_estimate": 64088.71146622736,
+          "standard_error": 166.25943969459155
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 63572.469198374,
+            "upper_bound": 64646.28346178864
+          },
+          "point_estimate": 64048.03505691058,
+          "standard_error": 276.49186281514653
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 60091.045939759024,
+            "upper_bound": 61485.52296159638
+          },
+          "point_estimate": 60727.22650602409,
+          "standard_error": 358.0600250005393
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 61188.860270334924,
+            "upper_bound": 62354.11178149921
+          },
+          "point_estimate": 61698.041754385966,
+          "standard_error": 300.75138234505755
+        }
+      ]
+    }
+  },
+  "branch_write/branches_16/1000": {
+    "baseline_ns": 70566.76519021482,
+    "candidate_ns": 64571.70487550528,
+    "delta_percent": -8.495586128327792,
+    "speedup": 1.0928434571499708,
+    "process_deltas_percent": [
+      -9.330823280993572,
+      -7.6531387714126815
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 69570.21250816697,
+            "upper_bound": 72371.49594010891
+          },
+          "point_estimate": 70870.0407985481,
+          "standard_error": 718.204048167445
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 69742.73200435539,
+            "upper_bound": 70900.14873606274
+          },
+          "point_estimate": 70263.48958188153,
+          "standard_error": 297.6056869208539
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 63893.403749188314,
+            "upper_bound": 64741.72213636363
+          },
+          "point_estimate": 64257.28253246753,
+          "standard_error": 218.85442282601988
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 64292.868110099334,
+            "upper_bound": 65662.58534023179
+          },
+          "point_estimate": 64886.12721854304,
+          "standard_error": 353.0279894677143
+        }
+      ]
+    }
+  },
+  "branch_write/branches_256/1000": {
+    "baseline_ns": 171142.88642109386,
+    "candidate_ns": 78984.21229321675,
+    "delta_percent": -53.84896565383526,
+    "speedup": 2.1667986734583384,
+    "process_deltas_percent": [
+      -52.86844274994815,
+      -54.81483741169233
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 168952.20360169493,
+            "upper_bound": 170984.6297838983
+          },
+          "point_estimate": 169854.63822033897,
+          "standard_error": 522.9176446745142
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 169430.36136974787,
+            "upper_bound": 177362.88299159665
+          },
+          "point_estimate": 172431.13462184876,
+          "standard_error": 2178.4224839571157
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 78083.43723046876,
+            "upper_bound": 82663.23590722657
+          },
+          "point_estimate": 80055.1360546875,
+          "standard_error": 1184.823894386814
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 77565.39852976197,
+            "upper_bound": 78308.33280257936
+          },
+          "point_estimate": 77913.28853174603,
+          "standard_error": 189.442899935951
+        }
+      ]
+    }
+  },
+  "branch_write/branches_64/1000": {
+    "baseline_ns": 100313.64065223752,
+    "candidate_ns": 73025.50365479851,
+    "delta_percent": -27.202817901944364,
+    "speedup": 1.3736795452508448,
+    "process_deltas_percent": [
+      -28.391769247701802,
+      -25.99151282250004
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 99923.45406393863,
+            "upper_bound": 102857.53202557542
+          },
+          "point_estimate": 101247.86767263425,
+          "standard_error": 754.8955456586958
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 99115.30755970151,
+            "upper_bound": 99679.94338805972
+          },
+          "point_estimate": 99379.4136318408,
+          "standard_error": 144.70218047806426
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 72171.24650270761,
+            "upper_bound": 72893.20939891697
+          },
+          "point_estimate": 72501.80671480147,
+          "standard_error": 184.92866133406955
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 73080.7007053903,
+            "upper_bound": 74112.14106598512
+          },
+          "point_estimate": 73549.20059479555,
+          "standard_error": 265.1318868390715
+        }
+      ]
+    }
+  }
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-text-large/baseline-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-text-large/baseline-0.txt
new file mode 100644
index 0000000..3bd0fc1
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-text-large/baseline-0.txt
@@ -0,0 +1,11 @@
+memcap: <=7636 MiB (60% of 12727 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_write/text/1000
+Benchmarking mixed_write/text/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/text/1000: Collecting 50 samples in estimated 2.0046 s (14k iterations)
+Benchmarking mixed_write/text/1000: Analyzing
+mixed_write/text/1000   time:   [145.62 µs 147.82 µs 150.56 µs]
+                        thrpt:  [183.08 MiB/s 186.47 MiB/s 189.28 MiB/s]
+Found 8 outliers among 50 measurements (16.00%)
+  2 (4.00%) high mild
+  6 (12.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-text-large/baseline-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-text-large/baseline-1.txt
new file mode 100644
index 0000000..9bc5ef5
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-text-large/baseline-1.txt
@@ -0,0 +1,10 @@
+memcap: <=7687 MiB (60% of 12811 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_write/text/1000
+Benchmarking mixed_write/text/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/text/1000: Collecting 50 samples in estimated 2.0000 s (13k iterations)
+Benchmarking mixed_write/text/1000: Analyzing
+mixed_write/text/1000   time:   [143.83 µs 144.67 µs 145.76 µs]
+                        thrpt:  [189.10 MiB/s 190.53 MiB/s 191.64 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  5 (10.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-text-large/baseline-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-text-large/baseline-build.txt
new file mode 100644
index 0000000..8c7ade9
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-text-large/baseline-build.txt
@@ -0,0 +1,3 @@
+memcap: <=7702 MiB (60% of 12837 MiB available) [systemd MemoryMax, swap off]
+   Compiling core-regression v0.0.0 (/home/bailey/github/polyxml-mixed-index/benchmarks/rust-xml-regression/target/core-baseline)
+    Finished `bench` profile [optimized] target(s) in 2.89s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-text-large/baseline.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-text-large/baseline.lock
new file mode 100644
index 0000000..78a11b2
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-text-large/baseline.lock
@@ -0,0 +1,633 @@
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-text-large/criterion-SHA256SUMS b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-text-large/criterion-SHA256SUMS
new file mode 100644
index 0000000..43009db
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-text-large/criterion-SHA256SUMS
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-text-large/criterion-results.tar.gz b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-text-large/criterion-results.tar.gz
new file mode 100644
index 0000000..09b763a
Binary files /dev/null and b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-text-large/criterion-results.tar.gz differ
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-text-large/current-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-text-large/current-0.txt
new file mode 100644
index 0000000..2f0d1bd
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-text-large/current-0.txt
@@ -0,0 +1,11 @@
+memcap: <=7649 MiB (60% of 12749 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_write/text/1000
+Benchmarking mixed_write/text/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/text/1000: Collecting 50 samples in estimated 2.0037 s (14k iterations)
+Benchmarking mixed_write/text/1000: Analyzing
+mixed_write/text/1000   time:   [142.12 µs 142.91 µs 143.81 µs]
+                        thrpt:  [191.67 MiB/s 192.88 MiB/s 193.95 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  3 (6.00%) high mild
+  2 (4.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-text-large/current-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-text-large/current-1.txt
new file mode 100644
index 0000000..6d2b586
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-text-large/current-1.txt
@@ -0,0 +1,11 @@
+memcap: <=7671 MiB (60% of 12786 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_write/text/1000
+Benchmarking mixed_write/text/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/text/1000: Collecting 50 samples in estimated 2.0027 s (14k iterations)
+Benchmarking mixed_write/text/1000: Analyzing
+mixed_write/text/1000   time:   [142.53 µs 144.54 µs 146.95 µs]
+                        thrpt:  [187.58 MiB/s 190.70 MiB/s 193.39 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  1 (2.00%) high mild
+  4 (8.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-text-large/current-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-text-large/current-build.txt
new file mode 100644
index 0000000..c38a8b9
--- /dev/null
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+ "quote",
+ "syn 2.0.119",
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+version = "1.0.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-text-large/harness.rs b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-text-large/harness.rs
new file mode 100644
index 0000000..f276972
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-text-large/harness.rs
@@ -0,0 +1,122 @@
+use criterion::{
+    criterion_group, criterion_main, BenchmarkId, Criterion, SamplingMode, Throughput,
+};
+use polyxml::schema::ModelSchema;
+use polyxml::schema_parser::XsdParser;
+use polyxml::{deserialize, serialize, PolyValue};
+use std::{hint::black_box, sync::Arc};
+
+fn fixture(kind: &str, count: usize) -> (Arc<ModelSchema>, Vec<u8>) {
+    let xsd = r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
+      <xs:simpleType name="State"><xs:restriction base="xs:string"><xs:enumeration value="Ready"/><xs:enumeration value="Done"/></xs:restriction></xs:simpleType>
+      <xs:simpleType name="Code"><xs:restriction base="xs:string"><xs:pattern value="[A-Z]{3}[0-9]{3}"/></xs:restriction></xs:simpleType>
+      <xs:element name="Root"><xs:complexType mixed="true"><xs:choice minOccurs="0" maxOccurs="unbounded">
+        <xs:element name="Text" type="xs:string"/>
+        <xs:element name="Number" type="xs:int"/>
+        <xs:element name="State" type="State"/>
+        <xs:element name="Code" type="Code"/>
+        <xs:element name="Child"><xs:complexType><xs:sequence><xs:element name="Value" type="xs:string"/></xs:sequence></xs:complexType></xs:element>
+      </xs:choice></xs:complexType></xs:element>
+    </xs:schema>"#;
+    let extra = (0..256).map(|i| format!(r#"<xs:element name="B{i}" type="xs:int"/>"#)).collect::<String>();
+    let xsd = xsd.replace("</xs:choice>", &format!("{extra}</xs:choice>"));
+    let ir = XsdParser::new().parse_str(&xsd).unwrap();
+    let schema = ModelSchema::from_ir(&ir, Some("Root")).unwrap();
+    let mut xml = String::from("<Root>");
+    for index in 0..count {
+        let part = match kind {
+            "text" => format!("text-{index}&amp;<![CDATA[more]]>"),
+            "scalar" => format!("<Text>item-{index}&amp;<![CDATA[more]]></Text>"),
+            "enum" => "<State>Ready</State>".into(),
+            "pattern" => format!("<Code>ABC{:03}</Code>", index % 1000),
+            "nested" => format!("<Child><Value>item-{index}</Value></Child>"),
+            _ => unreachable!(),
+        };
+        xml.push_str(&part);
+    }
+    xml.push_str("</Root>");
+    let value = deserialize(xml.as_bytes(), Arc::clone(&schema)).unwrap();
+    let items_name = &schema.fields[schema.mixed_content.as_ref().unwrap().items_index].name;
+    let items = value.get(items_name).and_then(PolyValue::as_list).unwrap();
+    if kind == "text" {
+        // Text, GeneralRef and CData become separate ordered items.
+        assert_eq!(items.len(), count * 3);
+        for (index, items) in items.chunks_exact(3).enumerate() {
+            for (item, expected) in
+                items
+                    .iter()
+                    .zip([format!("text-{index}"), "&".into(), "more".into()])
+            {
+                assert_eq!(item.get("kind").and_then(PolyValue::as_str), Some("#text"));
+                assert_eq!(
+                    item.get("value").and_then(PolyValue::as_str),
+                    Some(expected.as_str())
+                );
+            }
+        }
+    } else {
+        assert_eq!(items.len(), count);
+        for (index, item) in items.iter().enumerate() {
+            let value = item.get("value").unwrap();
+            match kind {
+                "scalar" => assert_eq!(value.as_str(), Some(format!("item-{index}&more").as_str())),
+                "enum" => assert_eq!(value.as_str(), Some("Ready")),
+                "pattern" => assert_eq!(
+                    value.as_str(),
+                    Some(format!("ABC{:03}", index % 1000).as_str())
+                ),
+                "nested" => assert_eq!(
+                    value.get("value").and_then(PolyValue::as_str),
+                    Some(format!("item-{index}").as_str())
+                ),
+                _ => unreachable!(),
+            }
+        }
+    }
+    let output = serialize("Root", &value, &schema, None).unwrap();
+    let reparsed = deserialize(&output, Arc::clone(&schema)).unwrap();
+    if kind == "text" {
+        // XML writers coalesce adjacent text segments. Compare their text value
+        // rather than treating the reader's segmentation as XML semantics.
+        let text = |value: &PolyValue| -> String {
+            value
+                .get(items_name)
+                .unwrap()
+                .as_list()
+                .unwrap()
+                .iter()
+                .map(|item| item.get("value").unwrap().as_str().unwrap())
+                .collect()
+        };
+        assert_eq!(text(&value), text(&reparsed));
+    } else {
+        assert_eq!(value, reparsed);
+    }
+    (schema, xml.into_bytes())
+}
+
+fn benchmarks(c: &mut Criterion) {
+    for operation in ["mixed_read", "mixed_write"] {
+        let mut group = c.benchmark_group(operation);
+        group.sampling_mode(SamplingMode::Flat);
+        for kind in ["text", "scalar", "enum", "pattern", "nested"] {
+            let (schema, xml) = fixture(kind, 1000);
+            let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+            group.throughput(Throughput::Bytes(xml.len() as u64));
+            group.bench_function(BenchmarkId::new(kind, 1000), |b| {
+                if operation == "mixed_read" {
+                    b.iter(|| {
+                        black_box(deserialize(black_box(&xml), Arc::clone(&schema)).unwrap())
+                    });
+                } else {
+                    b.iter(|| {
+                        black_box(serialize("Root", black_box(&value), &schema, None).unwrap())
+                    });
+                }
+            });
+        }
+        group.finish();
+    }
+}
+criterion_group!(benches, benchmarks);
+criterion_main!(benches);
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-text-large/metadata.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-text-large/metadata.json
new file mode 100644
index 0000000..336c506
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-text-large/metadata.json
@@ -0,0 +1,19 @@
+{
+  "revisions": {
+    "baseline": "1819c91b0808b9242c642d82350d2b657b60108c",
+    "current": "58cb346f964b5196dfad62e8a62a8aa4beb9beef"
+  },
+  "core_status": {
+    "baseline": "",
+    "current": ""
+  },
+  "sample_size": 50,
+  "warmup_seconds": 1.0,
+  "measurement_seconds": 2.0,
+  "rounds": 2,
+  "filter": "^mixed_write/text/",
+  "order": "alternate baseline/current per round",
+  "os": "Linux-6.18.40.1-microsoft-standard-WSL2-x86_64-with-glibc2.43",
+  "cpu": "11th Gen Intel(R) Core(TM) i5-11600K @ 3.90GHz",
+  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)\nbinary: rustc\ncommit-hash: b940084d7eb6a299eb4bfeb8e34901bc051e7ac4\ncommit-date: 2026-09-28\nhost: x86_64-unknown-linux-gnu\nrelease: 1.99.0\nLLVM version: 23.1.1\n"
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-text-large/summary.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-text-large/summary.json
new file mode 100644
index 0000000..4c9bf8a
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-branch-index-text-large/summary.json
@@ -0,0 +1,54 @@
+{
+  "mixed_write/text/1000": {
+    "baseline_ns": 146248.0560868914,
+    "candidate_ns": 143724.580183045,
+    "delta_percent": -1.725476544007598,
+    "speedup": 1.0175577197764818,
+    "process_deltas_percent": [
+      -3.323216608160251,
+      -0.0929517499600685
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 145622.3888309091,
+            "upper_bound": 150557.37318363634
+          },
+          "point_estimate": 147822.91120000003,
+          "standard_error": 1269.8438143015371
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 143829.50069475657,
+            "upper_bound": 145761.46011235955
+          },
+          "point_estimate": 144673.20097378275,
+          "standard_error": 498.1063140449954
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 142120.05620804193,
+            "upper_bound": 143811.8948898601
+          },
+          "point_estimate": 142910.43566433564,
+          "standard_error": 433.17302734850045
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 142531.88053508772,
+            "upper_bound": 146945.61416842102
+          },
+          "point_estimate": 144538.72470175437,
+          "standard_error": 1133.5231194472792
+        }
+      ]
+    }
+  }
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-index-gate-sampled.log b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-index-gate-sampled.log
new file mode 100644
index 0000000..6db7872
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-index-gate-sampled.log
@@ -0,0 +1,771 @@
+memcap: <=7680 MiB (60% of 12801 MiB available) [systemd MemoryMax, swap off]
+==> [1/6] Running Rust format check (cargo fmt)...
+==> [2/6] Running Rust Clippy (cargo clippy -D warnings)...
+    Checking polyxml v0.34.6 (/home/bailey/github/polyxml-mixed-index/crates/polyxml-core)
+   Compiling pyo3-ffi v0.29.2
+   Compiling pyo3 v0.29.2
+    Checking polyxml-cli v0.34.6 (/home/bailey/github/polyxml-mixed-index/crates/polyxml-cli)
+    Checking polyxml-js v0.34.6 (/home/bailey/github/polyxml-mixed-index/crates/polyxml-js)
+    Checking polyxml-wasm v0.34.6 (/home/bailey/github/polyxml-mixed-index/crates/polyxml-wasm)
+    Checking polyxml-python v0.34.6 (/home/bailey/github/polyxml-mixed-index/crates/polyxml-python)
+    Checking polyxml-c v0.34.6 (/home/bailey/github/polyxml-mixed-index/crates/polyxml-c)
+    Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.16s
+==> [3/6] Running Rust workspace tests (cargo test)...
+   Compiling polyxml v0.34.6 (/home/bailey/github/polyxml-mixed-index/crates/polyxml-core)
+   Compiling polyxml-cli v0.34.6 (/home/bailey/github/polyxml-mixed-index/crates/polyxml-cli)
+   Compiling pyo3-ffi v0.29.2
+   Compiling pyo3 v0.29.2
+   Compiling polyxml-wasm v0.34.6 (/home/bailey/github/polyxml-mixed-index/crates/polyxml-wasm)
+   Compiling polyxml-js v0.34.6 (/home/bailey/github/polyxml-mixed-index/crates/polyxml-js)
+   Compiling polyxml-python v0.34.6 (/home/bailey/github/polyxml-mixed-index/crates/polyxml-python)
+   Compiling polyxml-c v0.34.6 (/home/bailey/github/polyxml-mixed-index/crates/polyxml-c)
+    Finished `test` profile [unoptimized + debuginfo] target(s) in 17.63s
+     Running unittests src/lib.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/polyxml-675b717e531d04ed)
+
+running 16 tests
+test integer::tests::comparison_uses_sign_and_magnitude ... ok
+test ir::chunker::tests::test_topological_scc_chunking_dag_invariants ... ok
+test ir::root_selection_tests::inherited_base_does_not_select_sibling_types ... ok
+test ir::root_selection_tests::rejects_missing_and_ambiguous_roots ... ok
+test json::tests::test_json_deserialization_accepts_python_field_names ... ok
+test ir::root_selection_tests::keeps_references_descendants_and_substitutions ... ok
+test json::tests::test_json_roundtrip_primitives ... ok
+test ir::root_selection_tests::field_reference_keeps_substitution_group_members ... ok
+test tests::test_deserialization_does_not_confuse_xmlns_with_attributes ... ok
+test tests::test_namespaced_serialization ... ok
+test tests::test_nested_elements_and_lists ... ok
+test tests::test_streaming_xml_item_stream ... ok
+test tests::test_roundtrip_serialization_deserialization ... ok
+test pattern::tests::bounded_cache_evicts_and_retains_invalid_results ... ok
+test pattern::tests::cache_matches_uncached_regex_under_churn_and_concurrency ... ok
+test pattern::tests::cyclic_working_set_above_capacity_keeps_reusing_entries ... ok
+
+test result: ok. 16 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.14s
+
+     Running tests/test_adversarial_identifiers.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_adversarial_identifiers-34056256ccaa17cb)
+
+running 7 tests
+test test_rust_adversarial_compilation ... ok
+test test_python_adversarial_compilation ... ok
+test test_go_adversarial_compilation ... ok
+test test_cpp_adversarial_compilation ... ok
+test test_java_adversarial_compilation ... ok
+test test_typescript_adversarial_compilation ... ok
+test test_csharp_adversarial_compilation ... ok
+
+test result: ok. 7 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 3.71s
+
+     Running tests/test_any_attribute.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_any_attribute-d5795d9c5e0fdefd)
+
+running 1 test
+test test_any_attribute_schema_parser_and_runtime_roundtrip ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_any_element.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_any_element-1fb225d6616938e8)
+
+running 2 tests
+test test_any_element_go_codegen ... ok
+test test_any_element_schema_parser_and_runtime_roundtrip ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_conformance.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_conformance-0b37810d65fedfce)
+
+running 4 tests
+test test_soap_envelope_conformance ... ok
+test test_atom_feed_conformance ... ok
+test test_ubl_invoice_conformance ... ok
+test test_streaming_catalog_conformance ... ok
+
+test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.02s
+
+     Running tests/test_core.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_core-f4cc1079f88df2bc)
+
+running 9 tests
+test test_error_handling_invalid_scalars ... ok
+test test_gregorian_partial_date_lexical_validation ... ok
+test test_all_scalar_types ... ok
+test integer_mappings_keep_fixed_width_builtins ... ok
+test test_malformed_xml_syntax_error ... ok
+test test_roundtrip_serialization_with_indentation ... ok
+test test_xsi_nil_handling ... ok
+test unbounded_integers_round_trip_and_compare_exact_bounds ... ok
+test test_xsd_gregorian_fields_round_trip_and_reject_invalid_dates ... ok
+
+test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_cpp_codegen.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_cpp_codegen-a4cd5571504c64d5)
+
+running 14 tests
+test test_cpp_cmake_modules_file_set ... ok
+test test_cpp_cmake_and_meson_generation ... ok
+test simple_aliases_follow_their_base_types ... ok
+test test_cpp_mode_and_backend_from_str_loose ... ok
+test test_cpp_glaze_backend_meta_generation ... ok
+test test_cpp_sanitization ... ok
+test mixed_content_mutual_cycle_compiles ... ok
+test mixed_content_self_cycle_compiles ... ok
+Choice pattern matching passed.
+test test_cpp_choice_variant_compilation ... ok
+Inheritance test passed.
+test test_cpp_inheritance_codegen ... ok
+Recursive tree unique_ptr passed.
+test test_cpp_recursive_cycle_unique_ptr ... ok
+All C++20 tests passed successfully.
+test test_cpp_struct_and_enum_codegen_compilation ... ok
+test test_cpp_modules_compilation ... ok
+ISO 20022 pacs.008 C++20 test passed.
+test test_cpp_from_xsd_schema ... ok
+
+test result: ok. 14 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.87s
+
+     Running tests/test_csharp_codegen.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_csharp_codegen-cf32febf6e7f0777)
+
+running 20 tests
+test choice_variants_avoid_record_member_names ... ok
+test emits_unrestricted_simple_types_and_validates_empty_records ... ok
+test test_csharp_record_kind_from_str_loose ... ok
+test test_csharp_any_attribute_codegen ... ok
+test test_csharp_date_or_datetime_lexical_union ... ok
+test test_csharp_sanitization ... ok
+test test_csharp_sequence_nested_inside_choice_codegen ... ok
+test test_csharp_source_gen_context ... ok
+  Determining projects to restore...
+  Restored /tmp/.tmp47hEKw/PaymentsApp.csproj (in 176 ms).
+  PaymentsApp -> /tmp/.tmp47hEKw/bin/Debug/net8.0/PaymentsApp.dll
+
+Build succeeded.
+    0 Warning(s)
+    0 Error(s)
+
+Time Elapsed 00:00:01.24
+Choice pattern matching and XML serialization passed!
+test test_csharp_choice_polymorphic_hierarchy ... ok
+test unbounded_integer_xml_preserves_digits ... ok
+  Determining projects to restore...
+  Restored /tmp/.tmpRaMWjQ/CrmApp.csproj (in 167 ms).
+  CrmApp -> /tmp/.tmpRaMWjQ/bin/Debug/net8.0/CrmApp.dll
+
+Build succeeded.
+    0 Warning(s)
+    0 Error(s)
+
+Time Elapsed 00:00:01.06
+Customer C# tests passed cleanly!
+test test_csharp_records_and_enums_generation ... ok
+  Determining projects to restore...
+  Restored /tmp/.tmp8ok7fy/TreeApp.csproj (in 169 ms).
+  TreeApp -> /tmp/.tmp8ok7fy/bin/Debug/net8.0/TreeApp.dll
+
+Build succeeded.
+    0 Warning(s)
+    0 Error(s)
+
+Time Elapsed 00:00:01.01
+Recursive tree C# tests passed cleanly!
+test test_csharp_recursive_cycle ... ok
+test test_csharp_mutable_inheritance_roundtrip ... ok
+test test_csharp_mutable_wrappers_and_choices_without_validation ... ok
+test test_csharp_simple_content_class_validator_and_unsealed_records ... ok
+test fixed_values_are_enforced_on_read_and_write ... ok
+test element_defaults_preserve_absence_and_empty_presence ... ok
+test lexical_union_attributes_round_trip ... ok
+test nillable_enum_collection_round_trips ... ok
+test particle_wire_structure_round_trips ... ok
+
+test result: ok. 20 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 50.18s
+
+     Running tests/test_go_codegen.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_go_codegen-005c45ed4341be87)
+
+running 25 tests
+test root_alias_names_are_unique_after_go_normalization ... ok
+test referenced_element_uses_declared_type_after_includes ... ok
+test test_go_any_attribute_codegen ... ok
+test test_go_backend_from_str_loose ... ok
+go: creating new go.mod: module payments
+go: to add module requirements and sums:
+	go mod tidy
+test imported_ordered_types_do_not_add_unused_bytes_import ... ok
+test test_go_date_or_datetime_lexical_union ... ok
+test test_go_easyjson_backend ... ok
+test test_go_enum_only_schema_omits_unused_xml_import ... ok
+test duplicate_choice_names_reject_invalid_branch_shapes ... ok
+go: creating new go.mod: module tree
+go: to add module requirements and sums:
+	go mod tidy
+test nested_lexical_unions_compile_and_round_trip_in_go ... ok
+test test_go_sanitization ... ok
+test test_go_sonic_backend ... ok
+go: creating new go.mod: module crm
+go: to add module requirements and sums:
+	go mod tidy
+test repeated_choice_branch_rejects_mixed_and_empty_selections ... ok
+test separate_choices_enforce_each_group ... ok
+test abstract_substitution_heads_are_rejected ... ok
+test repeated_sequence_groups_enforce_bounds_and_order ... ok
+test test_go_abstract_xsi_type_dispatch ... ok
+test roots_and_union_attributes_round_trip ... ok
+=== RUN   TestChoiceMutualExclusivity
+    payments_test.go:44: Correctly rejected concurrent choice branches: choice ContactChoice mutual exclusivity violation: multiple branches populated (2)
+--- PASS: TestChoiceMutualExclusivity (0.00s)
+PASS
+ok  	payments	0.003s
+test test_go_choice_mutual_exclusivity ... ok
+test temporal_scalars_preserve_xsd_lexical_values ... ok
+test test_go_namespaced_element_ref_matching ... ok
+=== RUN   TestRecursiveTree
+--- PASS: TestRecursiveTree (0.00s)
+PASS
+ok  	tree	0.003s
+test test_go_recursive_cycle_pointers ... ok
+=== RUN   TestCustomerRoundtrip
+--- PASS: TestCustomerRoundtrip (0.00s)
+PASS
+ok  	crm	0.005s
+test unbounded_integer_xml_preserves_digits ... ok
+test test_go_struct_and_enum_generation ... ok
+test ordered_particles_and_choice_branches_round_trip ... ok
+
+test result: ok. 25 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 1.12s
+
+     Running tests/test_java_codegen.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_java_codegen-a6078e165fc64681)
+
+running 17 tests
+test test_java_jackson_backend_enum_annotations ... ok
+test test_java_jackson_backend_from_str_loose ... ok
+test test_java_identifier_sanitization ... ok
+test test_direct_codec_rejects_wildcards_and_name_collisions ... ok
+test test_java_jackson_backend_simple_type_annotations ... ok
+test test_java_jackson_backend_struct_annotations ... ok
+test test_java_bean_validation_annotations_are_opt_in ... ok
+test test_java_jackson_backend_union_annotations ... ok
+test jackson3_preserves_core_annotations_and_maps_record_text ... ok
+test test_java_plain_record_inlines_base_fields ... ok
+test test_java_sealed_interface_choice ... ok
+test test_java_module_container_class ... ok
+test test_java_records_and_enums_generation ... ok
+test test_java_plain_record_extension_javac_execute ... ok
+test test_java_record_builder_and_nested_codec_execute ... ok
+test test_java_mutable_builders_and_direct_codecs_execute ... ok
+test test_java_direct_nil_lists_choices_and_namespaces ... ok
+
+test result: ok. 17 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 2.53s
+
+     Running tests/test_json.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_json-74440efee0e911e7)
+
+running 4 tests
+test test_json_scalar_coercion ... ok
+test test_json_nested_objects_and_lists ... ok
+test test_json_primitives_and_alias_modes ... ok
+test test_polyvalue_direct_json_methods ... ok
+
+test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_lexical_lists.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_lexical_lists-0f6750d9c4bf9a3c)
+
+running 2 tests
+test named_list_items_enforce_facets_and_enumerations ... ok
+test typed_lexical_lists_round_trip_across_codecs ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 3.29s
+
+     Running tests/test_lexical_union_codegen.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_lexical_union_codegen-3c208893561d2732)
+
+running 2 tests
+test lexical_union_xml_selects_first_valid_member_and_round_trips ... ok
+test lexical_unions_are_typed_in_all_targets ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_mixed_branch_lookup.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_mixed_branch_lookup-b361da17b3391045)
+
+running 1 test
+test large_mixed_tables_keep_first_match_metadata_edits_records_and_nil ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
+
+     Running tests/test_mixed_content.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_mixed_content-1a697ad935ae2797)
+
+running 5 tests
+test mixed_items_field_avoids_existing_attribute_name ... ok
+test parser_builds_ordered_mixed_content_union ... ok
+test mixed_content_preserves_text_and_child_order ... ok
+test mixed_content_preserves_nested_child_order ... ok
+test generated_models_keep_typed_content_items_in_all_targets ... ok
+
+test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_mixed_nil.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_mixed_nil-9410990f6ba737b9)
+
+running 2 tests
+test nil_scalar_and_nested_items_keep_order_and_differ_from_empty_strings ... ok
+test nil_instance_prefix_does_not_rebind_the_element_namespace ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_pattern_codegen.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_pattern_codegen-5eee5f9fe2ed3d1a)
+
+running 9 tests
+test generated_typescript_pattern_validation_all_backends ... ok
+test pattern_restrictions_preserve_or_groups_and_inherited_and_steps ... ok
+test gregorian_primitives_emit_validated_types_across_targets ... ok
+test generated_python_pattern_validation ... ok
+test generated_go_pattern_validation_and_xml_roundtrip ... ok
+test generated_java_pattern_validation_and_direct_codecs ... ok
+test generated_rust_pattern_validation_and_xml_roundtrip ... ok
+test generated_cpp_pattern_validation ... ok
+test generated_csharp_pattern_validation ... ok
+
+test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 2.02s
+
+     Running tests/test_python_codegen.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_python_codegen-cc734e908fb39fb6)
+
+running 16 tests
+test test_identifier_sanitization ... ok
+test multiline_xsd_documentation_stays_inside_python_comments ... ok
+test test_python_abstract_meta_emission ... ok
+test test_python_choice_union_codegen ... ok
+test test_python_any_attribute_codegen ... ok
+test test_python_codecs_generation ... ok
+test test_python_dataclass_codegen ... ok
+test test_python_generated_tag_and_custom_header ... ok
+test test_python_any_element_codegen ... ok
+test test_python_pydantic_codegen_with_facets ... ok
+test test_python_recursive_type_codegen ... ok
+test test_python_aot_codegen ... ok
+test test_python_derived_meta_inheritance ... ok
+test test_python_simplecontent_default_factory ... ok
+test test_python_sequence_nested_inside_choice_codegen ... ok
+test quoted_docstrings_preserve_text_and_remain_valid_python ... ok
+
+test result: ok. 16 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.04s
+
+     Running tests/test_qualified_attributes.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_qualified_attributes-f8397a31cf1ecf15)
+
+running 5 tests
+test global_attribute_references_round_trip_by_namespace ... ok
+test imported_inline_global_attribute_enum_round_trips ... ok
+test derived_validators_preserve_base_constraints ... ok
+test lexical_dependencies_compile_and_round_trip_without_implicit_imports ... ok
+test inherited_attribute_and_distinct_element_keep_separate_property_names ... ok
+
+test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 8.19s
+
+     Running tests/test_runtime_fast_paths.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_runtime_fast_paths-7bf9091b7252b7db)
+
+running 6 tests
+test repeated_lexical_lists_keep_whitespace_validation ... ok
+test repeated_nested_records_validate_their_own_lexical_lists ... ok
+test lexical_list_formatting_preserves_escaping_empty_lists_and_long_numbers ... ok
+test indexed_scalar_state_preserves_enum_pattern_and_split_text ... ok
+test cached_patterns_keep_raw_restriction_and_trimmed_pattern_semantics ... ok
+test unified_scalar_state_keeps_mixed_branch_order_nil_and_nested_frames ... ok
+
+test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_rust_codecs.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_rust_codecs-9692e165bd5e14bf)
+
+running 4 tests
+test test_order_choice_roundtrip ... ok
+test test_facet_validation_min_max_length ... ok
+test test_empty_element_codec ... ok
+test test_recursive_boxing_roundtrip ... ok
+
+test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_rust_codegen.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_rust_codegen-8bce8b4b67c7eca3)
+
+running 26 tests
+test test_rust_attribute_codec_loop_syntax ... ok
+test multiline_docs_and_raw_field_names_are_valid_source ... ok
+test test_rust_codecs_codegen ... ok
+test test_rust_digit_prefixed_module_sanitization ... ok
+test test_rust_choice_union_codegen ... ok
+test test_rust_identifier_sanitization ... ok
+test test_rust_enum_and_methods ... ok
+test test_rust_extension_base_cycle_cut ... ok
+test test_rust_owned_codegen ... ok
+test test_rust_phf_dispatch_uniquifies_like_field_metas ... ok
+test test_rust_rkyv_derives ... ok
+test test_rust_phf_dispatch_union_groups_branch_tags ... ok
+test test_rust_simple_type_cycle_resilience ... ok
+test test_rust_extension_inlines_base_fields ... ok
+test test_rust_simple_content_extension_shadow_rule ... ok
+test test_rust_simple_content_text_codec ... ok
+test test_rust_topological_scc_chunking ... ok
+test test_rust_zero_copy_codegen ... ok
+test test_rust_read_element_text_accumulates_refs_and_cdata ... ok
+test test_rust_recursive_cycle_boxing ... ok
+test test_rust_phf_dispatch_emission ... ok
+test test_rust_extension_codecs_decode_and_encode_base_fields ... ok
+test empty_modules_compile_without_unused_reexports ... ok
+test binary_lexical_values_compile_and_round_trip_in_owned_and_borrowed_modes ... ok
+test duplicate_wire_names_keep_distinct_json_values ... ok
+test named_choice_wrappers_round_trip_without_unreachable_dispatch ... ok
+
+test result: ok. 26 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 15.38s
+
+     Running tests/test_schema_audit.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_schema_audit-24992dfb5b4a626c)
+
+running 13 tests
+test distinct_values_with_colliding_variant_names_stay_unique ... ok
+test derived_simple_type_inherits_base_patterns ... ok
+test duplicate_enumeration_values_are_deduped ... ok
+test quick_xml_serde_skips_unknown_elements ... ok
+test generated_rust_has_no_deny_unknown_fields ... ok
+test all_languages_disambiguate_flat_collision ... ok
+test named_group_reference_fields_are_parsed ... ok
+test rust_flat_output_has_no_colliding_type_names ... ok
+test simple_content_extension_emits_value_field ... ok
+test nested_inline_complex_type_is_extracted_not_leaked ... ok
+test chameleon_include_adopts_including_namespace_per_includer ... ok
+test restricted_simple_types_emit_named_aliases ... ok
+test diamond_includes_do_not_duplicate_upa_source_documents ... ok
+
+test result: ok. 13 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_schema_ir.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_schema_ir-f793c1b9895343c7)
+
+running 20 tests
+test global_attribute_reference_uses_declared_type ... ok
+test test_language_context_adapter ... ok
+test schema_errors_preserve_forward_imports_and_annotation_payloads ... ok
+test missing_included_schema_is_an_error ... ok
+test consumed_particles_do_not_swallow_following_declarations ... ok
+test derived_complex_type_keeps_base_and_bounded_choice ... ok
+test inline_list_item_types_preserve_enum_and_union_declarations ... ok
+test consumed_child_subtrees_do_not_swallow_following_types ... ok
+test test_tarjan_mutual_recursive_cycle_detection_and_boxing ... ok
+test test_parse_lexical_union_member_types_and_inline_members ... ok
+test schema_for_schemas_declared_types_are_not_unknown_builtins ... ok
+test test_substitution_groups ... ok
+test test_minijinja_template_engine_and_filters ... ok
+test test_tarjan_self_recursive_cycle_detection_and_boxing ... ok
+test test_list_fields_do_not_trigger_spurious_cycles ... ok
+test test_parse_complex_type_and_facets ... ok
+test xml_prefix_is_available_without_explicit_declaration ... ok
+test imported_inline_global_attribute_types_are_resolved ... ok
+test test_sequence_nested_inside_choice_preserved_in_ir ... ok
+test test_parse_choice_as_union ... ok
+
+test result: ok. 20 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_security.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_security-c3afa670f1d6c619)
+
+running 6 tests
+test test_malformed_unclosed_cdata_rejection ... ok
+test test_numeric_character_references ... ok
+test test_cdata_section_handling ... ok
+test test_xml_entity_roundtrip_escaping ... ok
+test unsupported_general_entities_are_rejected ... ok
+test test_max_depth_recursion_limit ... ok
+
+test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_temporal_union.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_temporal_union-e25d1f9b83e2fdc4)
+
+running 2 tests
+test go_temporal_union_preserves_branches_and_lexicals ... ok
+test csharp_temporal_union_preserves_branches_and_lexicals ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 3.05s
+
+     Running tests/test_transcoder.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_transcoder-6854114408316a2e)
+
+running 6 tests
+test test_schemaless_pretty_transcoding ... ok
+test test_schemaless_preserves_refs_cdata_and_attr_entities ... ok
+test test_transcoder_errors ... ok
+test test_schemaless_xml_to_json_and_back ... ok
+test test_schema_directed_transcoding ... ok
+test test_schema_from_ir_transcoding ... ok
+
+test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_ts_codegen.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_ts_codegen-4e67290c9758f4d9)
+
+running 9 tests
+test test_ts_backend_from_str_loose ... ok
+test test_ts_identifier_sanitization ... ok
+test test_ts_recursive_cycle_zod_lazy ... ok
+test test_ts_discriminated_union_choice ... ok
+test test_ts_interface_and_enum_codegen ... ok
+test test_ts_valibot_schema_generation ... ok
+test test_ts_typebox_schema_generation ... ok
+test test_ts_zod_schema_generation ... ok
+test mixed_content_inheritance_compiles_with_widened_items ... ok
+
+test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.32s
+
+     Running tests/test_ubl_csharp.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_ubl_csharp-b04bc8d2d5f891c2)
+
+running 2 tests
+test unprefixed_xsd_builtin_simple_content_base_uses_default_namespace ... ok
+test multi_namespace_roots_and_inherited_simple_content_compile_and_round_trip ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 2.97s
+
+     Running tests/test_unbounded_choice.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_unbounded_choice-7672e62aa5ecca1a)
+
+running 1 test
+go: creating new go.mod: module testmod
+go: to add module requirements and sums:
+	go mod tidy
+=== RUN   TestUnboundedChoiceOrder
+--- PASS: TestUnboundedChoiceOrder (0.00s)
+PASS
+ok  	testmod	0.002s
+test test_unbounded_choice_ir_and_all_targets ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.14s
+
+     Running tests/test_upa.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_upa-a20019d257c7eac5)
+
+running 6 tests
+test local_form_and_in_scope_qnames_distinguish_namespaces ... ok
+test model_groups_derivation_and_substitution_members_are_checked ... ok
+test imported_groups_and_chameleon_wildcards_keep_source_namespaces ... ok
+test all_groups_and_wildcard_namespaces_are_checked ... ok
+test optional_siblings_and_choice_lookahead_violate_upa ... ok
+test occurrence_ranges_keep_particle_identity_and_count_boundaries ... ok
+
+test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_value_constraints.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_value_constraints-73eb81a96de588c1)
+
+running 2 tests
+test fixed_constraints_cover_input_and_output_in_value_space ... ok
+test repeated_particle_cardinality_belongs_to_the_group ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_xsi_type.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_xsi_type-2c07a0776bd0ec60)
+
+running 11 tests
+test abstract_type_without_derivations_errors ... ok
+test plain_type_attribute_is_not_mistaken_for_dispatch ... ok
+test from_ir_flattens_base_fields_and_registers_variants ... ok
+test abstract_type_requires_concrete_selector ... ok
+test iterparse_dispatches_each_streamed_item ... ok
+test nil_abstract_complex_type_skips_concrete_dispatch ... ok
+test root_xsi_type_dispatch_including_empty_element ... ok
+test variant_serialization_requires_namespaces ... ok
+test nested_xsi_type_dispatch_and_round_trip ... ok
+test unknown_xsi_type_on_abstract_type_errors ... ok
+test xsi_type_resolves_namespace_inherited_from_parent ... ok
+
+test result: ok. 11 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running unittests src/lib.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/polyxml-4ccc220bbd6a27a0)
+
+running 2 tests
+test tests::test_c_abi_nested_list_batch_roundtrip ... ok
+test tests::test_c_abi_namespaced_roundtrip ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running unittests src/lib.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/polyxml_cli-dabf613ae4318f1b)
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running unittests src/main.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/polyxml-cec02944de7101b9)
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_cli.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_cli-714ccf0c30d96734)
+
+running 47 tests
+test fish_completion_filters_values_when_available ... ok
+test manifest_generation_does_not_ignore_cli_overrides ... ok
+Loading manifest: /tmp/.tmp0HGjUl/polyxml.toml
+Compiling schema: /tmp/.tmp0HGjUl/model.xsd
+  Namespace: urn:app
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Emitting target [csharp] into /tmp/.tmp0HGjUl/cs
+Emitting target [ts] into /tmp/.tmp0HGjUl/ts
+Emitting target [go] into /tmp/.tmp0HGjUl/go
+Emitting target [rust] into /tmp/.tmp0HGjUl/rs
+Build finished successfully.
+test test_cli_build_polyxml_manifest_with_new_features ... ok
+Parsing schema: /tmp/.tmpFAAgCE/customer.xsd
+  Namespace: urn:crm
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+test test_cli_csharp_source_gen_and_record_struct ... ok
+test test_cli_cpp_modules_and_glaze ... ok
+test test_cli_generate_custom_header_and_generated_tags ... ok
+test jackson3_cli_and_manifest_emit_equivalent_models ... ok
+test test_cli_generate_dry_run ... ok
+test imported_substitution_helpers_do_not_require_spurious_module_owners ... ok
+test test_cli_generate_help ... ok
+Parsing schema: /tmp/.tmpybnChH/service.xsd
+  Namespace: urn:service
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+test python_features_respect_manifest_false_values_and_backend ... ok
+test test_cli_generate_multi_lang ... ok
+Parsing schema: /tmp/.tmpybnChH/service.xsd
+test test_cli_generate_python_backends ... ok
+test retained_imported_ordered_helpers_belong_to_the_unique_namespace_module ... ok
+  Namespace: urn:service
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+test test_cli_go_easyjson_and_sonic_backend ... ok
+Loading manifest: /tmp/.tmpbyI5tv/polyxml.toml
+Compiling schema: /tmp/.tmpbyI5tv/schema.xsd
+test test_cli_help ... ok
+test test_cli_generate_rust_zero_copy_and_owned ... ok
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Emitting target [rust] into /tmp/.tmpbyI5tv/rs
+Emitting target [go] into /tmp/.tmpbyI5tv/go
+Emitting target [csharp] into /tmp/.tmpbyI5tv/cs
+Build finished successfully.
+test test_cli_manifest_custom_header_workspace_and_target_override ... ok
+test test_cli_python_aot_generation ... ok
+Parsing schema: /tmp/.tmpsorofI/event.xsd
+go: creating new go.mod: module crm
+go: to add module requirements and sums:
+	go mod tidy
+  Namespace: urn:events
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+test test_cli_multiple_root_element_selection ... ok
+test test_cli_rust_phf_feature ... ok
+test completion_candidates_follow_target_validation ... ok
+Parsing schema: /tmp/.tmpk4zbCp/event.xsd
+  Namespace: urn:events
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+test test_cli_rust_rkyv_feature ... ok
+test test_cli_python_aot_rejects_dataclass_style_and_slots ... ok
+test test_cli_transcode_bidirectional ... ok
+test invalid_schema_grammar_and_types_fail_before_generation ... ok
+Parsing schema: /tmp/.tmpesliRY/item.xsd
+  Namespace: urn:store
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+Parsing schema: /tmp/.tmpesliRY/item.xsd
+test test_cli_validate_valid_and_invalid ... ok
+  Namespace: urn:store
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+test test_cli_typescript_valibot_and_typebox_backend ... ok
+test bash_completion_filters_values_in_the_shell ... ok
+test unified_help_shows_generation_options ... ok
+test test_cli_root_element_selection ... ok
+test test_polyxml_toml_manifest_build ... ok
+test test_root_selection_keeps_imported_module_types ... ok
+test test_java_csharp_model_style_options_and_manifest ... ok
+test unified_manifest_forms_generate_identical_output_and_validate_early ... ok
+test zsh_completion_filters_values_when_available ... ok
+test unsupported_xsd_alternatives_fail_explicitly ... ok
+test validate_and_generate_reject_upa_violations ... ok
+test unified_options_fail_before_schema_io_including_dry_run ... ok
+test unified_supported_backends_and_styles_validate ... ok
+=== RUN   TestAccountE2E
+--- PASS: TestAccountE2E (0.00s)
+PASS
+ok  	crm	0.003s
+test test_cli_go_generation ... ok
+E2E C++20 driver passed!
+test test_cli_cpp_generation ... ok
+test test_cli_java_generation ... ok
+test test_cli_shared_modules_deduplication ... ok
+  Determining projects to restore...
+test test_cli_rust_split_units_and_chunking ... ok
+  Restored /tmp/.tmpDrTV5j/cli_csharp_app/CrmCliApp.csproj (in 202 ms).
+test test_cli_typescript_generation ... ok
+  CrmCliApp -> /tmp/.tmpDrTV5j/cli_csharp_app/bin/Debug/net8.0/CrmCliApp.dll
+
+Build succeeded.
+    0 Warning(s)
+    0 Error(s)
+
+Time Elapsed 00:00:01.32
+E2E C# CLI test passed successfully!
+test test_cli_csharp_generation ... ok
+
+test result: ok. 47 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 3.16s
+
+     Running unittests src/lib.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/polyxml_js-878a75d7b7901cc9)
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running unittests src/lib.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/_polyxml-a668b0910babaf29)
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running unittests src/lib.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/polyxml_wasm-d510c7f48918b595)
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+   Doc-tests polyxml
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+   Doc-tests polyxml_cli
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+   Doc-tests polyxml_wasm
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+==> [4/6] Compiling Python PyO3 extension (maturin develop)...
+🍹 Building a mixed python/rust project
+🐍 Found CPython 3.14 at /home/bailey/github/polyxml-mixed-index/.venv/bin/python
+🔗 Found pyo3 bindings with abi3-py3.12 support
+📡 Using build options features from pyproject.toml
+Using Python 3.14.4 environment at: /home/bailey/github/polyxml-mixed-index/.venv
+Checked 6 packages in 0.61ms
+   Compiling pyo3-ffi v0.29.2
+   Compiling pyo3 v0.29.2
+   Compiling polyxml v0.34.6 (/home/bailey/github/polyxml-mixed-index/crates/polyxml-core)
+   Compiling polyxml-python v0.34.6 (/home/bailey/github/polyxml-mixed-index/crates/polyxml-python)
+    Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.40s
+📦 Built wheel for abi3 Python ≥ 3.12 to /tmp/.tmpWqpCqR/polyxml-0.34.6-cp312-abi3-linux_x86_64.whl
+✏️ Setting installed package as editable
+🛠 Installed polyxml-0.34.6
+==> [5/6] Running Python Ruff checks...
+All checks passed!
+10 files already formatted
+==> [6/6] Running Python tests with 100% statement & branch coverage...
+........................................................................ [ 64%]
+........................................                                 [100%]
+================================ tests coverage ================================
+_______________ coverage: platform linux, python 3.14.4-final-0 ________________
+
+Name    Stmts   Miss Branch BrPart  Cover   Missing
+---------------------------------------------------
+TOTAL     181      0     58      0   100%
+
+3 files skipped due to complete coverage.
+Required test coverage of 100% reached. Total coverage: 100.00%
+112 passed in 0.49s
+✨ All PolyXML dual-language quality gates passed!
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-index-gate.log b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-index-gate.log
new file mode 100644
index 0000000..3eafa67
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-index-gate.log
@@ -0,0 +1,937 @@
+memcap: <=7668 MiB (60% of 12781 MiB available) [systemd MemoryMax, swap off]
+==> [1/6] Running Rust format check (cargo fmt)...
+==> [2/6] Running Rust Clippy (cargo clippy -D warnings)...
+   Compiling syn v3.0.5
+    Checking serde_core v1.0.229
+    Checking memchr v2.8.3
+   Compiling serde_derive v1.0.229
+    Checking serde v1.0.229
+   Compiling syn v2.0.119
+    Checking lexical-util v1.0.7
+    Checking siphasher v1.0.3
+    Checking phf_shared v0.14.0
+    Checking zmij v1.0.23
+    Checking aho-corasick v1.1.5
+    Checking regex-syntax v0.8.11
+    Checking fastrand v2.5.0
+    Checking itoa v1.0.18
+    Checking serde_json v1.0.151
+    Checking regex-automata v0.4.18
+    Checking lexical-parse-integer v1.0.6
+    Checking lexical-write-integer v1.0.6
+    Checking lexical-write-float v1.0.6
+    Checking lexical-parse-float v1.0.6
+    Checking regex v1.13.1
+    Checking phf_generator v0.14.0
+   Compiling thiserror-impl v2.0.21
+    Checking memo-map v0.3.4
+    Checking minijinja v2.24.0
+    Checking thiserror v2.0.21
+    Checking phf_codegen v0.14.0
+    Checking lexical-core v1.0.6
+    Checking quick-xml v0.42.0
+    Checking smallvec v1.16.2
+    Checking heck v0.5.0
+    Checking once_cell v1.21.4
+    Checking polyxml v0.34.6 (/home/bailey/github/polyxml-mixed-index/crates/polyxml-core)
+    Checking cfg-if v1.0.4
+    Checking libc v0.2.189
+    Checking utf8parse v0.2.2
+    Checking anstyle-parse v1.0.0
+    Checking colorchoice v1.0.5
+    Checking anstyle-query v1.1.5
+    Checking anstyle v1.0.14
+    Checking is_terminal_polyfill v1.70.2
+    Checking anstream v1.0.0
+    Checking strsim v0.11.1
+    Checking bitflags v2.13.2
+    Checking clap_lex v1.1.0
+    Checking clap_builder v4.6.7
+   Compiling clap_derive v4.6.7
+    Checking clap v4.6.7
+   Compiling zerocopy-derive v0.8.57
+    Checking linux-raw-sys v0.12.1
+    Checking rustix v1.1.5
+    Checking zerocopy v0.8.57
+    Checking getrandom v0.4.3
+    Checking tempfile v3.27.0
+    Checking half v2.7.1
+    Checking either v1.18.0
+    Checking ciborium-io v0.2.2
+    Checking ciborium-ll v0.2.2
+    Checking itertools v0.13.0
+    Checking cast v0.3.0
+    Checking same-file v1.0.6
+    Checking walkdir v2.5.0
+    Checking criterion-plot v0.8.2
+    Checking num-traits v0.2.19
+    Checking alloca v0.4.0
+   Compiling phf_macros v0.14.0
+    Checking ciborium v0.2.2
+    Checking page_size v0.6.0
+    Checking tinytemplate v1.2.1
+    Checking oorandom v11.1.5
+    Checking yansi v1.0.1
+    Checking diff v0.1.13
+    Checking anes v0.1.6
+    Checking criterion v0.8.2
+    Checking pretty_assertions v1.4.1
+    Checking phf v0.14.0
+   Compiling target-lexicon v0.13.5
+   Compiling wasm-bindgen-shared v0.2.129
+   Compiling pyo3-build-config v0.29.2
+    Checking winnow v1.0.4
+   Compiling rustversion v1.0.23
+    Checking toml_parser v1.1.3+spec-1.1.0
+   Compiling pyo3-ffi v0.29.2
+    Checking serde_spanned v1.1.1
+    Checking toml_datetime v1.1.1+spec-1.1.0
+    Checking toml_writer v1.1.2+spec-1.1.0
+    Checking toml v1.1.6+spec-1.1.0
+   Compiling unicode-segmentation v1.13.3
+   Compiling bumpalo v3.20.3
+    Checking glob v0.3.4
+   Compiling wasm-bindgen-macro-support v0.2.129
+   Compiling convert_case v0.6.0
+   Compiling wasm-bindgen v0.2.129
+   Compiling pyo3 v0.29.2
+   Compiling pyo3-macros-backend v0.29.2
+   Compiling napi-build v2.5.0
+   Compiling semver v1.0.28
+    Checking unicode-ident v1.0.24
+   Compiling napi-derive-backend v1.0.75
+   Compiling polyxml-js v0.34.6 (/home/bailey/github/polyxml-mixed-index/crates/polyxml-js)
+   Compiling pyo3-macros v0.29.2
+   Compiling wasm-bindgen-macro v0.2.129
+    Checking polyxml-cli v0.34.6 (/home/bailey/github/polyxml-mixed-index/crates/polyxml-cli)
+   Compiling ctor v0.2.9
+    Checking napi-sys v2.4.0
+   Compiling napi-derive v2.16.13
+    Checking napi v2.16.17
+    Checking polyxml-wasm v0.34.6 (/home/bailey/github/polyxml-mixed-index/crates/polyxml-wasm)
+    Checking polyxml-python v0.34.6 (/home/bailey/github/polyxml-mixed-index/crates/polyxml-python)
+    Checking polyxml-c v0.34.6 (/home/bailey/github/polyxml-mixed-index/crates/polyxml-c)
+    Finished `dev` profile [unoptimized + debuginfo] target(s) in 44.52s
+==> [3/6] Running Rust workspace tests (cargo test)...
+   Compiling unicode-ident v1.0.24
+   Compiling proc-macro2 v1.0.107
+   Compiling quote v1.0.47
+   Compiling syn v3.0.5
+   Compiling serde_derive v1.0.229
+   Compiling serde v1.0.229
+   Compiling syn v2.0.119
+   Compiling once_cell v1.21.4
+   Compiling thiserror-impl v2.0.21
+   Compiling minijinja v2.24.0
+   Compiling thiserror v2.0.21
+   Compiling quick-xml v0.42.0
+   Compiling polyxml v0.34.6 (/home/bailey/github/polyxml-mixed-index/crates/polyxml-core)
+   Compiling utf8parse v0.2.2
+   Compiling anstyle-parse v1.0.0
+   Compiling is_terminal_polyfill v1.70.2
+   Compiling colorchoice v1.0.5
+   Compiling anstyle-query v1.1.5
+   Compiling anstream v1.0.0
+   Compiling strsim v0.11.1
+   Compiling clap_builder v4.6.7
+   Compiling clap_derive v4.6.7
+   Compiling clap v4.6.7
+   Compiling zerocopy-derive v0.8.57
+   Compiling zerocopy v0.8.57
+   Compiling tempfile v3.27.0
+   Compiling half v2.7.1
+   Compiling ciborium-ll v0.2.2
+   Compiling phf_macros v0.14.0
+   Compiling ciborium v0.2.2
+   Compiling tinytemplate v1.2.1
+   Compiling criterion v0.8.2
+   Compiling phf v0.14.0
+   Compiling winnow v1.0.4
+   Compiling toml_parser v1.1.3+spec-1.1.0
+   Compiling serde_spanned v1.1.1
+   Compiling toml_datetime v1.1.1+spec-1.1.0
+   Compiling toml_writer v1.1.2+spec-1.1.0
+   Compiling toml v1.1.6+spec-1.1.0
+   Compiling wasm-bindgen-shared v0.2.129
+   Compiling glob v0.3.4
+   Compiling wasm-bindgen-macro-support v0.2.129
+   Compiling aho-corasick v1.1.5
+   Compiling regex-automata v0.4.18
+   Compiling wasm-bindgen-macro v0.2.129
+   Compiling polyxml-cli v0.34.6 (/home/bailey/github/polyxml-mixed-index/crates/polyxml-cli)
+   Compiling wasm-bindgen v0.2.129
+   Compiling regex v1.13.1
+   Compiling pyo3-macros-backend v0.29.2
+   Compiling napi-derive-backend v1.0.75
+   Compiling polyxml-js v0.34.6 (/home/bailey/github/polyxml-mixed-index/crates/polyxml-js)
+   Compiling pyo3-macros v0.29.2
+   Compiling pyo3-ffi v0.29.2
+   Compiling ctor v0.2.9
+   Compiling napi-sys v2.4.0
+   Compiling napi v2.16.17
+   Compiling pyo3 v0.29.2
+   Compiling napi-derive v2.16.13
+   Compiling polyxml-wasm v0.34.6 (/home/bailey/github/polyxml-mixed-index/crates/polyxml-wasm)
+   Compiling polyxml-python v0.34.6 (/home/bailey/github/polyxml-mixed-index/crates/polyxml-python)
+   Compiling polyxml-c v0.34.6 (/home/bailey/github/polyxml-mixed-index/crates/polyxml-c)
+    Finished `test` profile [unoptimized + debuginfo] target(s) in 1m 05s
+     Running unittests src/lib.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/polyxml-675b717e531d04ed)
+
+running 16 tests
+test integer::tests::comparison_uses_sign_and_magnitude ... ok
+test ir::chunker::tests::test_topological_scc_chunking_dag_invariants ... ok
+test ir::root_selection_tests::inherited_base_does_not_select_sibling_types ... ok
+test ir::root_selection_tests::rejects_missing_and_ambiguous_roots ... ok
+test ir::root_selection_tests::keeps_references_descendants_and_substitutions ... ok
+test json::tests::test_json_deserialization_accepts_python_field_names ... ok
+test json::tests::test_json_roundtrip_primitives ... ok
+test tests::test_nested_elements_and_lists ... ok
+test tests::test_streaming_xml_item_stream ... ok
+test tests::test_deserialization_does_not_confuse_xmlns_with_attributes ... ok
+test ir::root_selection_tests::field_reference_keeps_substitution_group_members ... ok
+test tests::test_roundtrip_serialization_deserialization ... ok
+test tests::test_namespaced_serialization ... ok
+test pattern::tests::bounded_cache_evicts_and_retains_invalid_results ... ok
+test pattern::tests::cache_matches_uncached_regex_under_churn_and_concurrency ... ok
+test pattern::tests::cyclic_working_set_above_capacity_keeps_reusing_entries ... ok
+
+test result: ok. 16 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.15s
+
+     Running tests/test_adversarial_identifiers.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_adversarial_identifiers-34056256ccaa17cb)
+
+running 7 tests
+test test_rust_adversarial_compilation ... ok
+test test_python_adversarial_compilation ... ok
+test test_go_adversarial_compilation ... ok
+test test_cpp_adversarial_compilation ... ok
+test test_java_adversarial_compilation ... ok
+test test_typescript_adversarial_compilation ... ok
+test test_csharp_adversarial_compilation ... ok
+
+test result: ok. 7 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 3.26s
+
+     Running tests/test_any_attribute.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_any_attribute-d5795d9c5e0fdefd)
+
+running 1 test
+test test_any_attribute_schema_parser_and_runtime_roundtrip ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_any_element.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_any_element-1fb225d6616938e8)
+
+running 2 tests
+test test_any_element_go_codegen ... ok
+test test_any_element_schema_parser_and_runtime_roundtrip ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_conformance.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_conformance-0b37810d65fedfce)
+
+running 4 tests
+test test_ubl_invoice_conformance ... ok
+test test_soap_envelope_conformance ... ok
+test test_atom_feed_conformance ... ok
+test test_streaming_catalog_conformance ... ok
+
+test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.02s
+
+     Running tests/test_core.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_core-f4cc1079f88df2bc)
+
+running 9 tests
+test integer_mappings_keep_fixed_width_builtins ... ok
+test test_gregorian_partial_date_lexical_validation ... ok
+test test_malformed_xml_syntax_error ... ok
+test test_error_handling_invalid_scalars ... ok
+test test_all_scalar_types ... ok
+test test_roundtrip_serialization_with_indentation ... ok
+test test_xsi_nil_handling ... ok
+test unbounded_integers_round_trip_and_compare_exact_bounds ... ok
+test test_xsd_gregorian_fields_round_trip_and_reject_invalid_dates ... ok
+
+test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_cpp_codegen.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_cpp_codegen-a4cd5571504c64d5)
+
+running 14 tests
+test simple_aliases_follow_their_base_types ... ok
+test test_cpp_cmake_modules_file_set ... ok
+test test_cpp_cmake_and_meson_generation ... ok
+test test_cpp_glaze_backend_meta_generation ... ok
+test test_cpp_mode_and_backend_from_str_loose ... ok
+test test_cpp_sanitization ... ok
+test mixed_content_self_cycle_compiles ... ok
+test mixed_content_mutual_cycle_compiles ... ok
+Inheritance test passed.
+test test_cpp_inheritance_codegen ... ok
+Choice pattern matching passed.
+test test_cpp_choice_variant_compilation ... ok
+All C++20 tests passed successfully.
+test test_cpp_struct_and_enum_codegen_compilation ... ok
+Recursive tree unique_ptr passed.
+test test_cpp_recursive_cycle_unique_ptr ... ok
+test test_cpp_modules_compilation ... ok
+ISO 20022 pacs.008 C++20 test passed.
+test test_cpp_from_xsd_schema ... ok
+
+test result: ok. 14 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.89s
+
+     Running tests/test_csharp_codegen.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_csharp_codegen-cf32febf6e7f0777)
+
+running 20 tests
+test choice_variants_avoid_record_member_names ... ok
+test emits_unrestricted_simple_types_and_validates_empty_records ... ok
+test test_csharp_record_kind_from_str_loose ... ok
+test test_csharp_any_attribute_codegen ... ok
+test test_csharp_date_or_datetime_lexical_union ... ok
+test test_csharp_sanitization ... ok
+test test_csharp_sequence_nested_inside_choice_codegen ... ok
+test test_csharp_source_gen_context ... ok
+  Determining projects to restore...
+  Restored /tmp/.tmpOFDxn1/PaymentsApp.csproj (in 194 ms).
+  PaymentsApp -> /tmp/.tmpOFDxn1/bin/Debug/net8.0/PaymentsApp.dll
+
+Build succeeded.
+    0 Warning(s)
+    0 Error(s)
+
+Time Elapsed 00:00:01.20
+Choice pattern matching and XML serialization passed!
+test test_csharp_choice_polymorphic_hierarchy ... ok
+test unbounded_integer_xml_preserves_digits ... ok
+  Determining projects to restore...
+  Restored /tmp/.tmpTpbbyr/CrmApp.csproj (in 165 ms).
+  CrmApp -> /tmp/.tmpTpbbyr/bin/Debug/net8.0/CrmApp.dll
+
+Build succeeded.
+    0 Warning(s)
+    0 Error(s)
+
+Time Elapsed 00:00:01.05
+Customer C# tests passed cleanly!
+test test_csharp_records_and_enums_generation ... ok
+  Determining projects to restore...
+  Restored /tmp/.tmpGigH2L/TreeApp.csproj (in 166 ms).
+  TreeApp -> /tmp/.tmpGigH2L/bin/Debug/net8.0/TreeApp.dll
+
+Build succeeded.
+    0 Warning(s)
+    0 Error(s)
+
+Time Elapsed 00:00:01.02
+Recursive tree C# tests passed cleanly!
+test test_csharp_recursive_cycle ... ok
+test test_csharp_mutable_inheritance_roundtrip ... ok
+test test_csharp_simple_content_class_validator_and_unsealed_records ... ok
+test test_csharp_mutable_wrappers_and_choices_without_validation ... ok
+test element_defaults_preserve_absence_and_empty_presence ... ok
+test fixed_values_are_enforced_on_read_and_write ... ok
+test lexical_union_attributes_round_trip ... ok
+test nillable_enum_collection_round_trips ... ok
+test particle_wire_structure_round_trips ... ok
+
+test result: ok. 20 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 50.46s
+
+     Running tests/test_go_codegen.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_go_codegen-005c45ed4341be87)
+
+running 25 tests
+test root_alias_names_are_unique_after_go_normalization ... ok
+test referenced_element_uses_declared_type_after_includes ... ok
+test test_go_any_attribute_codegen ... ok
+test test_go_backend_from_str_loose ... ok
+go: creating new go.mod: module payments
+go: to add module requirements and sums:
+	go mod tidy
+test imported_ordered_types_do_not_add_unused_bytes_import ... ok
+test test_go_date_or_datetime_lexical_union ... ok
+test test_go_easyjson_backend ... ok
+test test_go_enum_only_schema_omits_unused_xml_import ... ok
+test duplicate_choice_names_reject_invalid_branch_shapes ... ok
+go: creating new go.mod: module tree
+go: to add module requirements and sums:
+	go mod tidy
+test roots_and_union_attributes_round_trip ... ok
+test test_go_sanitization ... ok
+test test_go_sonic_backend ... ok
+go: creating new go.mod: module crm
+go: to add module requirements and sums:
+	go mod tidy
+=== RUN   TestChoiceMutualExclusivity
+    payments_test.go:44: Correctly rejected concurrent choice branches: choice ContactChoice mutual exclusivity violation: multiple branches populated (2)
+--- PASS: TestChoiceMutualExclusivity (0.00s)
+PASS
+ok  	payments	0.007s
+test nested_lexical_unions_compile_and_round_trip_in_go ... ok
+test test_go_choice_mutual_exclusivity ... ok
+test repeated_sequence_groups_enforce_bounds_and_order ... ok
+test abstract_substitution_heads_are_rejected ... ok
+test repeated_choice_branch_rejects_mixed_and_empty_selections ... ok
+test temporal_scalars_preserve_xsd_lexical_values ... ok
+test test_go_abstract_xsi_type_dispatch ... ok
+test separate_choices_enforce_each_group ... ok
+test test_go_namespaced_element_ref_matching ... ok
+=== RUN   TestRecursiveTree
+--- PASS: TestRecursiveTree (0.00s)
+PASS
+ok  	tree	0.002s
+test test_go_recursive_cycle_pointers ... ok
+=== RUN   TestCustomerRoundtrip
+--- PASS: TestCustomerRoundtrip (0.00s)
+PASS
+ok  	crm	0.002s
+test test_go_struct_and_enum_generation ... ok
+test unbounded_integer_xml_preserves_digits ... ok
+test ordered_particles_and_choice_branches_round_trip ... ok
+
+test result: ok. 25 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 1.04s
+
+     Running tests/test_java_codegen.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_java_codegen-a6078e165fc64681)
+
+running 17 tests
+test test_java_identifier_sanitization ... ok
+test test_java_jackson_backend_simple_type_annotations ... ok
+test test_java_jackson_backend_enum_annotations ... ok
+test test_java_jackson_backend_struct_annotations ... ok
+test test_java_jackson_backend_from_str_loose ... ok
+test test_java_jackson_backend_union_annotations ... ok
+test test_direct_codec_rejects_wildcards_and_name_collisions ... ok
+test test_java_bean_validation_annotations_are_opt_in ... ok
+test jackson3_preserves_core_annotations_and_maps_record_text ... ok
+test test_java_plain_record_inlines_base_fields ... ok
+test test_java_module_container_class ... ok
+test test_java_records_and_enums_generation ... ok
+test test_java_sealed_interface_choice ... ok
+test test_java_plain_record_extension_javac_execute ... ok
+test test_java_record_builder_and_nested_codec_execute ... ok
+test test_java_mutable_builders_and_direct_codecs_execute ... ok
+test test_java_direct_nil_lists_choices_and_namespaces ... ok
+
+test result: ok. 17 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 2.44s
+
+     Running tests/test_json.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_json-74440efee0e911e7)
+
+running 4 tests
+test test_polyvalue_direct_json_methods ... ok
+test test_json_primitives_and_alias_modes ... ok
+test test_json_scalar_coercion ... ok
+test test_json_nested_objects_and_lists ... ok
+
+test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_lexical_lists.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_lexical_lists-0f6750d9c4bf9a3c)
+
+running 2 tests
+test named_list_items_enforce_facets_and_enumerations ... ok
+test typed_lexical_lists_round_trip_across_codecs ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 3.27s
+
+     Running tests/test_lexical_union_codegen.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_lexical_union_codegen-3c208893561d2732)
+
+running 2 tests
+test lexical_union_xml_selects_first_valid_member_and_round_trips ... ok
+test lexical_unions_are_typed_in_all_targets ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_mixed_branch_lookup.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_mixed_branch_lookup-b361da17b3391045)
+
+running 1 test
+test large_mixed_tables_keep_first_match_metadata_edits_records_and_nil ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
+
+     Running tests/test_mixed_content.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_mixed_content-1a697ad935ae2797)
+
+running 5 tests
+test mixed_items_field_avoids_existing_attribute_name ... ok
+test parser_builds_ordered_mixed_content_union ... ok
+test mixed_content_preserves_nested_child_order ... ok
+test mixed_content_preserves_text_and_child_order ... ok
+test generated_models_keep_typed_content_items_in_all_targets ... ok
+
+test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_mixed_nil.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_mixed_nil-9410990f6ba737b9)
+
+running 2 tests
+test nil_scalar_and_nested_items_keep_order_and_differ_from_empty_strings ... ok
+test nil_instance_prefix_does_not_rebind_the_element_namespace ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_pattern_codegen.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_pattern_codegen-5eee5f9fe2ed3d1a)
+
+running 9 tests
+test generated_typescript_pattern_validation_all_backends ... ok
+test pattern_restrictions_preserve_or_groups_and_inherited_and_steps ... ok
+test gregorian_primitives_emit_validated_types_across_targets ... ok
+test generated_python_pattern_validation ... ok
+test generated_go_pattern_validation_and_xml_roundtrip ... ok
+test generated_java_pattern_validation_and_direct_codecs ... ok
+test generated_cpp_pattern_validation ... ok
+test generated_csharp_pattern_validation ... ok
+test generated_rust_pattern_validation_and_xml_roundtrip ... ok
+
+test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 24.57s
+
+     Running tests/test_python_codegen.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_python_codegen-cc734e908fb39fb6)
+
+running 16 tests
+test test_identifier_sanitization ... ok
+test multiline_xsd_documentation_stays_inside_python_comments ... ok
+test test_python_abstract_meta_emission ... ok
+test test_python_any_attribute_codegen ... ok
+test test_python_choice_union_codegen ... ok
+test test_python_codecs_generation ... ok
+test test_python_any_element_codegen ... ok
+test test_python_generated_tag_and_custom_header ... ok
+test test_python_aot_codegen ... ok
+test test_python_dataclass_codegen ... ok
+test test_python_pydantic_codegen_with_facets ... ok
+test test_python_recursive_type_codegen ... ok
+test test_python_derived_meta_inheritance ... ok
+test test_python_simplecontent_default_factory ... ok
+test test_python_sequence_nested_inside_choice_codegen ... ok
+test quoted_docstrings_preserve_text_and_remain_valid_python ... ok
+
+test result: ok. 16 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.06s
+
+     Running tests/test_qualified_attributes.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_qualified_attributes-f8397a31cf1ecf15)
+
+running 5 tests
+test global_attribute_references_round_trip_by_namespace ... ok
+test imported_inline_global_attribute_enum_round_trips ... ok
+test inherited_attribute_and_distinct_element_keep_separate_property_names ... ok
+test derived_validators_preserve_base_constraints ... ok
+test lexical_dependencies_compile_and_round_trip_without_implicit_imports ... ok
+
+test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 8.30s
+
+     Running tests/test_runtime_fast_paths.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_runtime_fast_paths-7bf9091b7252b7db)
+
+running 6 tests
+test repeated_nested_records_validate_their_own_lexical_lists ... ok
+test repeated_lexical_lists_keep_whitespace_validation ... ok
+test lexical_list_formatting_preserves_escaping_empty_lists_and_long_numbers ... ok
+test indexed_scalar_state_preserves_enum_pattern_and_split_text ... ok
+test cached_patterns_keep_raw_restriction_and_trimmed_pattern_semantics ... ok
+test unified_scalar_state_keeps_mixed_branch_order_nil_and_nested_frames ... ok
+
+test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_rust_codecs.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_rust_codecs-9692e165bd5e14bf)
+
+running 4 tests
+test test_empty_element_codec ... ok
+test test_facet_validation_min_max_length ... ok
+test test_order_choice_roundtrip ... ok
+test test_recursive_boxing_roundtrip ... ok
+
+test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_rust_codegen.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_rust_codegen-8bce8b4b67c7eca3)
+
+running 26 tests
+test multiline_docs_and_raw_field_names_are_valid_source ... ok
+test test_rust_choice_union_codegen ... ok
+test test_rust_attribute_codec_loop_syntax ... ok
+test test_rust_codecs_codegen ... ok
+test test_rust_identifier_sanitization ... ok
+test test_rust_extension_base_cycle_cut ... ok
+test test_rust_owned_codegen ... ok
+test test_rust_phf_dispatch_uniquifies_like_field_metas ... ok
+test test_rust_phf_dispatch_union_groups_branch_tags ... ok
+test test_rust_recursive_cycle_boxing ... ok
+test test_rust_extension_codecs_decode_and_encode_base_fields ... ok
+test test_rust_rkyv_derives ... ok
+test test_rust_extension_inlines_base_fields ... ok
+test test_rust_enum_and_methods ... ok
+test test_rust_digit_prefixed_module_sanitization ... ok
+test test_rust_simple_type_cycle_resilience ... ok
+test test_rust_simple_content_extension_shadow_rule ... ok
+test test_rust_read_element_text_accumulates_refs_and_cdata ... ok
+test test_rust_simple_content_text_codec ... ok
+test test_rust_phf_dispatch_emission ... ok
+test test_rust_topological_scc_chunking ... ok
+test test_rust_zero_copy_codegen ... ok
+test duplicate_wire_names_keep_distinct_json_values ... ok
+test binary_lexical_values_compile_and_round_trip_in_owned_and_borrowed_modes ... ok
+test empty_modules_compile_without_unused_reexports ... ok
+test named_choice_wrappers_round_trip_without_unreachable_dispatch ... ok
+
+test result: ok. 26 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 58.75s
+
+     Running tests/test_schema_audit.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_schema_audit-24992dfb5b4a626c)
+
+running 13 tests
+test duplicate_enumeration_values_are_deduped ... ok
+test distinct_values_with_colliding_variant_names_stay_unique ... ok
+test derived_simple_type_inherits_base_patterns ... ok
+test quick_xml_serde_skips_unknown_elements ... ok
+test nested_inline_complex_type_is_extracted_not_leaked ... ok
+test named_group_reference_fields_are_parsed ... ok
+test simple_content_extension_emits_value_field ... ok
+test generated_rust_has_no_deny_unknown_fields ... ok
+test rust_flat_output_has_no_colliding_type_names ... ok
+test all_languages_disambiguate_flat_collision ... ok
+test restricted_simple_types_emit_named_aliases ... ok
+test chameleon_include_adopts_including_namespace_per_includer ... ok
+test diamond_includes_do_not_duplicate_upa_source_documents ... ok
+
+test result: ok. 13 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
+
+     Running tests/test_schema_ir.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_schema_ir-f793c1b9895343c7)
+
+running 20 tests
+test global_attribute_reference_uses_declared_type ... ok
+test missing_included_schema_is_an_error ... ok
+test test_list_fields_do_not_trigger_spurious_cycles ... ok
+test test_language_context_adapter ... ok
+test schema_errors_preserve_forward_imports_and_annotation_payloads ... ok
+test derived_complex_type_keeps_base_and_bounded_choice ... ok
+test consumed_particles_do_not_swallow_following_declarations ... ok
+test inline_list_item_types_preserve_enum_and_union_declarations ... ok
+test consumed_child_subtrees_do_not_swallow_following_types ... ok
+test test_tarjan_mutual_recursive_cycle_detection_and_boxing ... ok
+test test_tarjan_self_recursive_cycle_detection_and_boxing ... ok
+test schema_for_schemas_declared_types_are_not_unknown_builtins ... ok
+test test_substitution_groups ... ok
+test test_parse_lexical_union_member_types_and_inline_members ... ok
+test test_minijinja_template_engine_and_filters ... ok
+test xml_prefix_is_available_without_explicit_declaration ... ok
+test test_parse_complex_type_and_facets ... ok
+test imported_inline_global_attribute_types_are_resolved ... ok
+test test_sequence_nested_inside_choice_preserved_in_ir ... ok
+test test_parse_choice_as_union ... ok
+
+test result: ok. 20 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_security.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_security-c3afa670f1d6c619)
+
+running 6 tests
+test test_malformed_unclosed_cdata_rejection ... ok
+test test_cdata_section_handling ... ok
+test test_numeric_character_references ... ok
+test test_xml_entity_roundtrip_escaping ... ok
+test unsupported_general_entities_are_rejected ... ok
+test test_max_depth_recursion_limit ... ok
+
+test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_temporal_union.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_temporal_union-e25d1f9b83e2fdc4)
+
+running 2 tests
+test go_temporal_union_preserves_branches_and_lexicals ... ok
+test csharp_temporal_union_preserves_branches_and_lexicals ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 3.06s
+
+     Running tests/test_transcoder.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_transcoder-6854114408316a2e)
+
+running 6 tests
+test test_schemaless_pretty_transcoding ... ok
+test test_schemaless_preserves_refs_cdata_and_attr_entities ... ok
+test test_schemaless_xml_to_json_and_back ... ok
+test test_transcoder_errors ... ok
+test test_schema_directed_transcoding ... ok
+test test_schema_from_ir_transcoding ... ok
+
+test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_ts_codegen.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_ts_codegen-4e67290c9758f4d9)
+
+running 9 tests
+test test_ts_backend_from_str_loose ... ok
+test test_ts_identifier_sanitization ... ok
+test test_ts_recursive_cycle_zod_lazy ... ok
+test test_ts_typebox_schema_generation ... ok
+test test_ts_interface_and_enum_codegen ... ok
+test test_ts_zod_schema_generation ... ok
+test test_ts_discriminated_union_choice ... ok
+test test_ts_valibot_schema_generation ... ok
+test mixed_content_inheritance_compiles_with_widened_items ... ok
+
+test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.32s
+
+     Running tests/test_ubl_csharp.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_ubl_csharp-b04bc8d2d5f891c2)
+
+running 2 tests
+test unprefixed_xsd_builtin_simple_content_base_uses_default_namespace ... ok
+test multi_namespace_roots_and_inherited_simple_content_compile_and_round_trip ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 2.97s
+
+     Running tests/test_unbounded_choice.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_unbounded_choice-7672e62aa5ecca1a)
+
+running 1 test
+go: creating new go.mod: module testmod
+go: to add module requirements and sums:
+	go mod tidy
+=== RUN   TestUnboundedChoiceOrder
+--- PASS: TestUnboundedChoiceOrder (0.00s)
+PASS
+ok  	testmod	0.002s
+test test_unbounded_choice_ir_and_all_targets ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.14s
+
+     Running tests/test_upa.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_upa-a20019d257c7eac5)
+
+running 6 tests
+test local_form_and_in_scope_qnames_distinguish_namespaces ... ok
+test imported_groups_and_chameleon_wildcards_keep_source_namespaces ... ok
+test model_groups_derivation_and_substitution_members_are_checked ... ok
+test optional_siblings_and_choice_lookahead_violate_upa ... ok
+test all_groups_and_wildcard_namespaces_are_checked ... ok
+test occurrence_ranges_keep_particle_identity_and_count_boundaries ... ok
+
+test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_value_constraints.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_value_constraints-73eb81a96de588c1)
+
+running 2 tests
+test fixed_constraints_cover_input_and_output_in_value_space ... ok
+test repeated_particle_cardinality_belongs_to_the_group ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_xsi_type.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_xsi_type-2c07a0776bd0ec60)
+
+running 11 tests
+test abstract_type_without_derivations_errors ... ok
+test plain_type_attribute_is_not_mistaken_for_dispatch ... ok
+test nil_abstract_complex_type_skips_concrete_dispatch ... ok
+test abstract_type_requires_concrete_selector ... ok
+test iterparse_dispatches_each_streamed_item ... ok
+test from_ir_flattens_base_fields_and_registers_variants ... ok
+test unknown_xsi_type_on_abstract_type_errors ... ok
+test root_xsi_type_dispatch_including_empty_element ... ok
+test nested_xsi_type_dispatch_and_round_trip ... ok
+test variant_serialization_requires_namespaces ... ok
+test xsi_type_resolves_namespace_inherited_from_parent ... ok
+
+test result: ok. 11 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running unittests src/lib.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/polyxml-4ccc220bbd6a27a0)
+
+running 2 tests
+test tests::test_c_abi_nested_list_batch_roundtrip ... ok
+test tests::test_c_abi_namespaced_roundtrip ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running unittests src/lib.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/polyxml_cli-dabf613ae4318f1b)
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running unittests src/main.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/polyxml-cec02944de7101b9)
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_cli.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_cli-714ccf0c30d96734)
+
+running 47 tests
+test fish_completion_filters_values_when_available ... ok
+test manifest_generation_does_not_ignore_cli_overrides ... ok
+Loading manifest: /tmp/.tmp4p2v6N/polyxml.toml
+Compiling schema: /tmp/.tmp4p2v6N/model.xsd
+  Namespace: urn:app
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Emitting target [csharp] into /tmp/.tmp4p2v6N/cs
+Emitting target [ts] into /tmp/.tmp4p2v6N/ts
+Emitting target [go] into /tmp/.tmp4p2v6N/go
+Emitting target [rust] into /tmp/.tmp4p2v6N/rs
+Build finished successfully.
+test test_cli_build_polyxml_manifest_with_new_features ... ok
+Parsing schema: /tmp/.tmporjtsf/customer.xsd
+  Namespace: urn:crm
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+test test_cli_csharp_source_gen_and_record_struct ... ok
+test test_cli_cpp_modules_and_glaze ... ok
+test test_cli_generate_custom_header_and_generated_tags ... ok
+test test_cli_generate_help ... ok
+test imported_substitution_helpers_do_not_require_spurious_module_owners ... ok
+test test_cli_generate_dry_run ... ok
+test jackson3_cli_and_manifest_emit_equivalent_models ... ok
+test python_features_respect_manifest_false_values_and_backend ... ok
+test test_cli_generate_multi_lang ... ok
+test test_cli_help ... ok
+Parsing schema: /tmp/.tmpSF1nxR/service.xsd
+  Namespace: urn:service
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+Loading manifest: /tmp/.tmpgoU8zK/polyxml.toml
+Compiling schema: /tmp/.tmpgoU8zK/schema.xsd
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Emitting target [rust] into /tmp/.tmpgoU8zK/rs
+Emitting target [go] into /tmp/.tmpgoU8zK/go
+Emitting target [csharp] into /tmp/.tmpgoU8zK/cs
+Build finished successfully.
+Parsing schema: /tmp/.tmpSF1nxR/service.xsd
+test test_cli_manifest_custom_header_workspace_and_target_override ... ok
+test test_cli_generate_python_backends ... ok
+  Namespace: urn:service
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+test test_cli_go_easyjson_and_sonic_backend ... ok
+test retained_imported_ordered_helpers_belong_to_the_unique_namespace_module ... ok
+test test_cli_generate_rust_zero_copy_and_owned ... ok
+Parsing schema: /tmp/.tmpQMspKd/event.xsd
+test test_cli_python_aot_generation ... ok
+  Namespace: urn:events
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+test test_cli_rust_phf_feature ... ok
+Parsing schema: /tmp/.tmp8R9qz1/event.xsd
+  Namespace: urn:events
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+go: creating new go.mod: module crm
+go: to add module requirements and sums:
+	go mod tidy
+test test_cli_rust_rkyv_feature ... ok
+test invalid_schema_grammar_and_types_fail_before_generation ... ok
+test test_cli_python_aot_rejects_dataclass_style_and_slots ... ok
+test test_cli_multiple_root_element_selection ... ok
+Parsing schema: /tmp/.tmpd9ldmb/item.xsd
+  Namespace: urn:store
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+test test_cli_transcode_bidirectional ... ok
+test completion_candidates_follow_target_validation ... ok
+Parsing schema: /tmp/.tmpd9ldmb/item.xsd
+  Namespace: urn:store
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+test test_cli_typescript_valibot_and_typebox_backend ... ok
+test test_cli_validate_valid_and_invalid ... ok
+test test_polyxml_toml_manifest_build ... ok
+test test_root_selection_keeps_imported_module_types ... ok
+test test_cli_root_element_selection ... ok
+test bash_completion_filters_values_in_the_shell ... ok
+test unified_help_shows_generation_options ... ok
+test test_java_csharp_model_style_options_and_manifest ... ok
+test unsupported_xsd_alternatives_fail_explicitly ... ok
+test zsh_completion_filters_values_when_available ... ok
+test validate_and_generate_reject_upa_violations ... ok
+test unified_manifest_forms_generate_identical_output_and_validate_early ... ok
+test unified_options_fail_before_schema_io_including_dry_run ... ok
+test unified_supported_backends_and_styles_validate ... ok
+=== RUN   TestAccountE2E
+--- PASS: TestAccountE2E (0.00s)
+PASS
+ok  	crm	0.005s
+test test_cli_go_generation ... ok
+test test_cli_java_generation ... ok
+E2E C++20 driver passed!
+test test_cli_cpp_generation ... ok
+test test_cli_shared_modules_deduplication ... ok
+  Determining projects to restore...
+  Restored /tmp/.tmpx2PK6F/cli_csharp_app/CrmCliApp.csproj (in 212 ms).
+test test_cli_typescript_generation ... ok
+  CrmCliApp -> /tmp/.tmpx2PK6F/cli_csharp_app/bin/Debug/net8.0/CrmCliApp.dll
+
+Build succeeded.
+    0 Warning(s)
+    0 Error(s)
+
+Time Elapsed 00:00:01.44
+E2E C# CLI test passed successfully!
+test test_cli_csharp_generation ... ok
+test test_cli_rust_split_units_and_chunking ... ok
+
+test result: ok. 47 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 9.51s
+
+     Running unittests src/lib.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/polyxml_js-878a75d7b7901cc9)
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running unittests src/lib.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/_polyxml-a668b0910babaf29)
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running unittests src/lib.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/polyxml_wasm-d510c7f48918b595)
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+   Doc-tests polyxml
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+   Doc-tests polyxml_cli
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+   Doc-tests polyxml_wasm
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+==> [4/6] Compiling Python PyO3 extension (maturin develop)...
+🍹 Building a mixed python/rust project
+🐍 Found CPython 3.14 at /home/bailey/github/polyxml-mixed-index/.venv/bin/python
+🔗 Found pyo3 bindings with abi3-py3.12 support
+📡 Using build options features from pyproject.toml
+Using Python 3.14.4 environment at: /home/bailey/github/polyxml-mixed-index/.venv
+Checked 6 packages in 30ms
+   Compiling serde_core v1.0.229
+   Compiling serde v1.0.229
+   Compiling pyo3-ffi v0.29.2
+   Compiling syn v2.0.119
+   Compiling fastrand v2.5.0
+   Compiling phf_generator v0.14.0
+   Compiling pyo3-macros-backend v0.29.2
+   Compiling minijinja v2.24.0
+   Compiling serde_json v1.0.151
+   Compiling pyo3 v0.29.2
+   Compiling pyo3-macros v0.29.2
+   Compiling phf_codegen v0.14.0
+   Compiling quick-xml v0.42.0
+   Compiling polyxml v0.34.6 (/home/bailey/github/polyxml-mixed-index/crates/polyxml-core)
+   Compiling polyxml-python v0.34.6 (/home/bailey/github/polyxml-mixed-index/crates/polyxml-python)
+    Finished `dev` profile [unoptimized + debuginfo] target(s) in 21.59s
+📦 Built wheel for abi3 Python ≥ 3.12 to /tmp/.tmpTYptf9/polyxml-0.34.6-cp312-abi3-linux_x86_64.whl
+✏️ Setting installed package as editable
+🛠 Installed polyxml-0.34.6
+==> [5/6] Running Python Ruff checks...
+All checks passed!
+10 files already formatted
+==> [6/6] Running Python tests with 100% statement & branch coverage...
+........................................................................ [ 64%]
+........................................                                 [100%]
+================================ tests coverage ================================
+_______________ coverage: platform linux, python 3.14.4-final-0 ________________
+
+Name    Stmts   Miss Branch BrPart  Cover   Missing
+---------------------------------------------------
+TOTAL     181      0     58      0   100%
+
+3 files skipped due to complete coverage.
+Required test coverage of 100% reached. Total coverage: 100.00%
+112 passed in 0.60s
+✨ All PolyXML dual-language quality gates passed!
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-index-tests.log b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-index-tests.log
new file mode 100644
index 0000000..f8248ab
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-index-tests.log
@@ -0,0 +1,112 @@
+memcap: <=7732 MiB (60% of 12887 MiB available) [systemd MemoryMax, swap off]
+   Compiling proc-macro2 v1.0.107
+   Compiling quote v1.0.47
+   Compiling unicode-ident v1.0.24
+   Compiling syn v3.0.5
+   Compiling serde_core v1.0.229
+   Compiling syn v2.0.119
+   Compiling serde v1.0.229
+   Compiling memchr v2.8.3
+   Compiling siphasher v1.0.3
+   Compiling serde_derive v1.0.229
+   Compiling cfg-if v1.0.4
+   Compiling zmij v1.0.23
+   Compiling zerocopy v0.8.57
+   Compiling libc v0.2.189
+   Compiling lexical-util v1.0.7
+   Compiling zerocopy-derive v0.8.57
+   Compiling serde_json v1.0.151
+   Compiling shlex v2.0.1
+   Compiling find-msvc-tools v0.1.12
+   Compiling cc v1.4.5
+   Compiling phf_shared v0.14.0
+   Compiling aho-corasick v1.1.5
+   Compiling regex-syntax v0.8.11
+   Compiling fastrand v2.5.0
+   Compiling autocfg v1.5.1
+   Compiling itoa v1.0.18
+   Compiling num-traits v0.2.19
+   Compiling regex-automata v0.4.18
+   Compiling half v2.7.1
+   Compiling alloca v0.4.0
+   Compiling lexical-write-integer v1.0.6
+   Compiling lexical-parse-integer v1.0.6
+   Compiling either v1.18.0
+   Compiling getrandom v0.4.3
+   Compiling clap_lex v1.1.0
+   Compiling rustix v1.1.5
+   Compiling anstyle v1.0.14
+   Compiling thiserror v2.0.21
+   Compiling ciborium-io v0.2.2
+   Compiling ciborium-ll v0.2.2
+   Compiling phf_generator v0.14.0
+   Compiling clap_builder v4.6.7
+   Compiling itertools v0.13.0
+   Compiling lexical-parse-float v1.0.6
+   Compiling lexical-write-float v1.0.6
+   Compiling regex v1.13.1
+   Compiling thiserror-impl v2.0.21
+   Compiling same-file v1.0.6
+   Compiling memo-map v0.3.4
+   Compiling linux-raw-sys v0.12.1
+   Compiling bitflags v2.13.2
+   Compiling cast v0.3.0
+   Compiling criterion-plot v0.8.2
+   Compiling minijinja v2.24.0
+   Compiling walkdir v2.5.0
+   Compiling phf_codegen v0.14.0
+   Compiling lexical-core v1.0.6
+   Compiling clap v4.6.7
+   Compiling phf_macros v0.14.0
+   Compiling ciborium v0.2.2
+   Compiling tinytemplate v1.2.1
+   Compiling page_size v0.6.0
+   Compiling quick-xml v0.42.0
+   Compiling oorandom v11.1.5
+   Compiling heck v0.5.0
+   Compiling smallvec v1.16.2
+   Compiling diff v0.1.13
+   Compiling yansi v1.0.1
+   Compiling anes v0.1.6
+   Compiling once_cell v1.21.4
+   Compiling tempfile v3.27.0
+   Compiling criterion v0.8.2
+   Compiling pretty_assertions v1.4.1
+   Compiling polyxml v0.34.6 (/home/bailey/github/polyxml-mixed-index/crates/polyxml-core)
+   Compiling phf v0.14.0
+    Finished `test` profile [unoptimized + debuginfo] target(s) in 39.72s
+     Running tests/test_mixed_branch_lookup.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_mixed_branch_lookup-ec9a2799ab26799e)
+
+running 1 test
+test large_mixed_tables_keep_first_match_metadata_edits_records_and_nil ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
+
+     Running tests/test_mixed_nil.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_mixed_nil-1aec7ae934470d6f)
+
+running 2 tests
+test nil_scalar_and_nested_items_keep_order_and_differ_from_empty_strings ... ok
+test nil_instance_prefix_does_not_rebind_the_element_namespace ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_runtime_fast_paths.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_runtime_fast_paths-cb1357dd8af777c0)
+
+running 6 tests
+test repeated_nested_records_validate_their_own_lexical_lists ... ok
+test repeated_lexical_lists_keep_whitespace_validation ... ok
+test lexical_list_formatting_preserves_escaping_empty_lists_and_long_numbers ... ok
+test indexed_scalar_state_preserves_enum_pattern_and_split_text ... ok
+test cached_patterns_keep_raw_restriction_and_trimmed_pattern_semantics ... ok
+test unified_scalar_state_keeps_mixed_branch_order_nil_and_nested_frames ... ok
+
+test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_value_constraints.rs (/home/bailey/github/PolyXML/target/followup-mixed-index-verification/debug/deps/test_value_constraints-22fd91427282898a)
+
+running 2 tests
+test fixed_constraints_cover_input_and_output_in_value_space ... ok
+test repeated_particle_cardinality_belongs_to_the_group ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/affinity-probe.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/affinity-probe.json
new file mode 100644
index 0000000..8deae48
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/affinity-probe.json
@@ -0,0 +1,9 @@
+[
+  {
+    "pid": 499097,
+    "executable": "/home/bailey/github/PolyXML/benchmarks/rust-xml-regression/target/core-baseline/target/release/deps/xml-ca09edc26c8ac4cc",
+    "cpu_affinity": [
+      4
+    ]
+  }
+]
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/baseline-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/baseline-0.txt
new file mode 100644
index 0000000..bf8df30
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/baseline-0.txt
@@ -0,0 +1,11 @@
+memcap: <=7747 MiB (60% of 12912 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_write/scalar/1000
+Benchmarking mixed_write/scalar/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/scalar/1000: Collecting 100 samples in estimated 5.0004 s (45k iterations)
+Benchmarking mixed_write/scalar/1000: Analyzing
+mixed_write/scalar/1000 time:   [107.51 µs 108.05 µs 108.67 µs]
+                        thrpt:  [367.73 MiB/s 369.85 MiB/s 371.70 MiB/s]
+Found 14 outliers among 100 measurements (14.00%)
+  6 (6.00%) high mild
+  8 (8.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/baseline-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/baseline-1.txt
new file mode 100644
index 0000000..3b64bee
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/baseline-1.txt
@@ -0,0 +1,11 @@
+memcap: <=7751 MiB (60% of 12919 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_write/scalar/1000
+Benchmarking mixed_write/scalar/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/scalar/1000: Collecting 100 samples in estimated 5.0062 s (43k iterations)
+Benchmarking mixed_write/scalar/1000: Analyzing
+mixed_write/scalar/1000 time:   [113.76 µs 114.57 µs 115.58 µs]
+                        thrpt:  [345.75 MiB/s 348.80 MiB/s 351.27 MiB/s]
+Found 10 outliers among 100 measurements (10.00%)
+  2 (2.00%) high mild
+  8 (8.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/baseline-2.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/baseline-2.txt
new file mode 100644
index 0000000..9aeab8e
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/baseline-2.txt
@@ -0,0 +1,11 @@
+memcap: <=7754 MiB (60% of 12924 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_write/scalar/1000
+Benchmarking mixed_write/scalar/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/scalar/1000: Collecting 100 samples in estimated 5.0029 s (42k iterations)
+Benchmarking mixed_write/scalar/1000: Analyzing
+mixed_write/scalar/1000 time:   [117.61 µs 118.46 µs 119.48 µs]
+                        thrpt:  [334.46 MiB/s 337.35 MiB/s 339.78 MiB/s]
+Found 19 outliers among 100 measurements (19.00%)
+  16 (16.00%) high mild
+  3 (3.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/baseline-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/baseline-build.txt
new file mode 100644
index 0000000..6747286
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/baseline-build.txt
@@ -0,0 +1,3 @@
+memcap: <=7745 MiB (60% of 12909 MiB available) [systemd MemoryMax, swap off]
+   Compiling core-regression v0.0.0 (/home/bailey/github/polyxml-mixed-nil/benchmarks/rust-xml-regression/target/core-baseline)
+    Finished `bench` profile [optimized] target(s) in 2.75s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/baseline.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/baseline.lock
new file mode 100644
index 0000000..78a11b2
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/baseline.lock
@@ -0,0 +1,633 @@
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/criterion-SHA256SUMS b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/criterion-SHA256SUMS
new file mode 100644
index 0000000..1b18ece
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/criterion-SHA256SUMS
@@ -0,0 +1,48 @@
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/criterion-results.tar.gz b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/criterion-results.tar.gz
new file mode 100644
index 0000000..32887eb
Binary files /dev/null and b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/criterion-results.tar.gz differ
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/current-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/current-0.txt
new file mode 100644
index 0000000..b9fd82f
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/current-0.txt
@@ -0,0 +1,11 @@
+memcap: <=7748 MiB (60% of 12914 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_write/scalar/1000
+Benchmarking mixed_write/scalar/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/scalar/1000: Collecting 100 samples in estimated 5.0076 s (40k iterations)
+Benchmarking mixed_write/scalar/1000: Analyzing
+mixed_write/scalar/1000 time:   [125.63 µs 126.79 µs 128.34 µs]
+                        thrpt:  [311.37 MiB/s 315.18 MiB/s 318.09 MiB/s]
+Found 14 outliers among 100 measurements (14.00%)
+  5 (5.00%) high mild
+  9 (9.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/current-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/current-1.txt
new file mode 100644
index 0000000..901590a
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/current-1.txt
@@ -0,0 +1,11 @@
+memcap: <=7745 MiB (60% of 12909 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_write/scalar/1000
+Benchmarking mixed_write/scalar/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/scalar/1000: Collecting 100 samples in estimated 5.0019 s (41k iterations)
+Benchmarking mixed_write/scalar/1000: Analyzing
+mixed_write/scalar/1000 time:   [112.03 µs 112.78 µs 113.88 µs]
+                        thrpt:  [350.92 MiB/s 354.34 MiB/s 356.70 MiB/s]
+Found 8 outliers among 100 measurements (8.00%)
+  2 (2.00%) high mild
+  6 (6.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/current-2.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/current-2.txt
new file mode 100644
index 0000000..647e8e7
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/current-2.txt
@@ -0,0 +1,11 @@
+memcap: <=7754 MiB (60% of 12923 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_write/scalar/1000
+Benchmarking mixed_write/scalar/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/scalar/1000: Collecting 100 samples in estimated 5.0090 s (40k iterations)
+Benchmarking mixed_write/scalar/1000: Analyzing
+mixed_write/scalar/1000 time:   [119.88 µs 121.04 µs 122.53 µs]
+                        thrpt:  [326.14 MiB/s 330.17 MiB/s 333.34 MiB/s]
+Found 14 outliers among 100 measurements (14.00%)
+  2 (2.00%) high mild
+  12 (12.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/current-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/current-build.txt
new file mode 100644
index 0000000..78d395e
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/current-build.txt
@@ -0,0 +1,3 @@
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+   Compiling core-regression v0.0.0 (/home/bailey/github/polyxml-mixed-nil/benchmarks/rust-xml-regression/target/core-current)
+    Finished `bench` profile [optimized] target(s) in 2.76s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/current.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/current.lock
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/harness.rs b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/harness.rs
new file mode 100644
index 0000000..7d0413e
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/harness.rs
@@ -0,0 +1,120 @@
+use criterion::{
+    criterion_group, criterion_main, BenchmarkId, Criterion, SamplingMode, Throughput,
+};
+use polyxml::schema::ModelSchema;
+use polyxml::schema_parser::XsdParser;
+use polyxml::{deserialize, serialize, PolyValue};
+use std::{hint::black_box, sync::Arc};
+
+fn fixture(kind: &str, count: usize) -> (Arc<ModelSchema>, Vec<u8>) {
+    let xsd = r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
+      <xs:simpleType name="State"><xs:restriction base="xs:string"><xs:enumeration value="Ready"/><xs:enumeration value="Done"/></xs:restriction></xs:simpleType>
+      <xs:simpleType name="Code"><xs:restriction base="xs:string"><xs:pattern value="[A-Z]{3}[0-9]{3}"/></xs:restriction></xs:simpleType>
+      <xs:element name="Root"><xs:complexType mixed="true"><xs:choice minOccurs="0" maxOccurs="unbounded">
+        <xs:element name="Text" type="xs:string"/>
+        <xs:element name="Number" type="xs:int"/>
+        <xs:element name="State" type="State"/>
+        <xs:element name="Code" type="Code"/>
+        <xs:element name="Child"><xs:complexType><xs:sequence><xs:element name="Value" type="xs:string"/></xs:sequence></xs:complexType></xs:element>
+      </xs:choice></xs:complexType></xs:element>
+    </xs:schema>"#;
+    let ir = XsdParser::new().parse_str(xsd).unwrap();
+    let schema = ModelSchema::from_ir(&ir, Some("Root")).unwrap();
+    let mut xml = String::from("<Root>");
+    for index in 0..count {
+        let part = match kind {
+            "text" => format!("text-{index}&amp;<![CDATA[more]]>"),
+            "scalar" => format!("<Text>item-{index}&amp;<![CDATA[more]]></Text>"),
+            "enum" => "<State>Ready</State>".into(),
+            "pattern" => format!("<Code>ABC{:03}</Code>", index % 1000),
+            "nested" => format!("<Child><Value>item-{index}</Value></Child>"),
+            _ => unreachable!(),
+        };
+        xml.push_str(&part);
+    }
+    xml.push_str("</Root>");
+    let value = deserialize(xml.as_bytes(), Arc::clone(&schema)).unwrap();
+    let items_name = &schema.fields[schema.mixed_content.as_ref().unwrap().items_index].name;
+    let items = value.get(items_name).and_then(PolyValue::as_list).unwrap();
+    if kind == "text" {
+        // Text, GeneralRef and CData become separate ordered items.
+        assert_eq!(items.len(), count * 3);
+        for (index, items) in items.chunks_exact(3).enumerate() {
+            for (item, expected) in
+                items
+                    .iter()
+                    .zip([format!("text-{index}"), "&".into(), "more".into()])
+            {
+                assert_eq!(item.get("kind").and_then(PolyValue::as_str), Some("#text"));
+                assert_eq!(
+                    item.get("value").and_then(PolyValue::as_str),
+                    Some(expected.as_str())
+                );
+            }
+        }
+    } else {
+        assert_eq!(items.len(), count);
+        for (index, item) in items.iter().enumerate() {
+            let value = item.get("value").unwrap();
+            match kind {
+                "scalar" => assert_eq!(value.as_str(), Some(format!("item-{index}&more").as_str())),
+                "enum" => assert_eq!(value.as_str(), Some("Ready")),
+                "pattern" => assert_eq!(
+                    value.as_str(),
+                    Some(format!("ABC{:03}", index % 1000).as_str())
+                ),
+                "nested" => assert_eq!(
+                    value.get("value").and_then(PolyValue::as_str),
+                    Some(format!("item-{index}").as_str())
+                ),
+                _ => unreachable!(),
+            }
+        }
+    }
+    let output = serialize("Root", &value, &schema, None).unwrap();
+    let reparsed = deserialize(&output, Arc::clone(&schema)).unwrap();
+    if kind == "text" {
+        // XML writers coalesce adjacent text segments. Compare their text value
+        // rather than treating the reader's segmentation as XML semantics.
+        let text = |value: &PolyValue| -> String {
+            value
+                .get(items_name)
+                .unwrap()
+                .as_list()
+                .unwrap()
+                .iter()
+                .map(|item| item.get("value").unwrap().as_str().unwrap())
+                .collect()
+        };
+        assert_eq!(text(&value), text(&reparsed));
+    } else {
+        assert_eq!(value, reparsed);
+    }
+    (schema, xml.into_bytes())
+}
+
+fn benchmarks(c: &mut Criterion) {
+    for operation in ["mixed_read", "mixed_write"] {
+        let mut group = c.benchmark_group(operation);
+        group.sampling_mode(SamplingMode::Flat);
+        for kind in ["text", "scalar", "enum", "pattern", "nested"] {
+            let (schema, xml) = fixture(kind, 1000);
+            let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+            group.throughput(Throughput::Bytes(xml.len() as u64));
+            group.bench_function(BenchmarkId::new(kind, 1000), |b| {
+                if operation == "mixed_read" {
+                    b.iter(|| {
+                        black_box(deserialize(black_box(&xml), Arc::clone(&schema)).unwrap())
+                    });
+                } else {
+                    b.iter(|| {
+                        black_box(serialize("Root", black_box(&value), &schema, None).unwrap())
+                    });
+                }
+            });
+        }
+        group.finish();
+    }
+}
+criterion_group!(benches, benchmarks);
+criterion_main!(benches);
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/metadata.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/metadata.json
new file mode 100644
index 0000000..5bcbe4c
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/metadata.json
@@ -0,0 +1,19 @@
+{
+  "revisions": {
+    "baseline": "1819c91b0808b9242c642d82350d2b657b60108c",
+    "current": "121ac4b888fd434060d13fc886835a2fd46d684c"
+  },
+  "core_status": {
+    "baseline": "",
+    "current": ""
+  },
+  "sample_size": 100,
+  "warmup_seconds": 3.0,
+  "measurement_seconds": 5.0,
+  "rounds": 3,
+  "filter": "^mixed_write/scalar/",
+  "order": "alternate baseline/current per round",
+  "os": "Linux-6.18.40.1-microsoft-standard-WSL2-x86_64-with-glibc2.43",
+  "cpu": "11th Gen Intel(R) Core(TM) i5-11600K @ 3.90GHz",
+  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)\nbinary: rustc\ncommit-hash: b940084d7eb6a299eb4bfeb8e34901bc051e7ac4\ncommit-date: 2026-09-28\nhost: x86_64-unknown-linux-gnu\nrelease: 1.99.0\nLLVM version: 23.1.1\n"
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/summary.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/summary.json
new file mode 100644
index 0000000..eb51a64
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-pinned-scalar/summary.json
@@ -0,0 +1,73 @@
+{
+  "mixed_write/scalar/1000": {
+    "baseline_ns": 114569.80495370374,
+    "candidate_ns": 121035.86733333334,
+    "delta_percent": 5.643775323037747,
+    "speedup": 0.9465773037192188,
+    "process_deltas_percent": [
+      17.3442544750267,
+      -1.5625920105875157,
+      2.176957357798881
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 107511.805599224,
+            "upper_bound": 108672.1389927938
+          },
+          "point_estimate": 108049.56159645232,
+          "standard_error": 297.2142283502884
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 113764.96839351855,
+            "upper_bound": 115580.65366203708
+          },
+          "point_estimate": 114569.80495370374,
+          "standard_error": 466.8652801752209
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 117612.36668810103,
+            "upper_bound": 119482.53963641827
+          },
+          "point_estimate": 118457.10663461541,
+          "standard_error": 479.0390825704119
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 125629.1308211587,
+            "upper_bound": 128341.5999811083
+          },
+          "point_estimate": 126789.95251889172,
+          "standard_error": 700.5806940257612
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 112030.5436383495,
+            "upper_bound": 113876.03261165047
+          },
+          "point_estimate": 112779.54633495148,
+          "standard_error": 483.774781015983
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 119882.12730555561,
+            "upper_bound": 122531.24086172842
+          },
+          "point_estimate": 121035.86733333334,
+          "standard_error": 683.0970450152082
+        }
+      ]
+    }
+  }
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-screen/baseline-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-screen/baseline-0.txt
new file mode 100644
index 0000000..dfd8f3f
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-screen/baseline-0.txt
@@ -0,0 +1,47 @@
+memcap: <=7693 MiB (60% of 12822 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_write/text/1000
+Benchmarking mixed_write/text/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/text/1000: Collecting 50 samples in estimated 2.0033 s (13k iterations)
+Benchmarking mixed_write/text/1000: Analyzing
+mixed_write/text/1000   time:   [146.05 µs 148.18 µs 150.98 µs]
+                        thrpt:  [182.57 MiB/s 186.02 MiB/s 188.73 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  2 (4.00%) high mild
+  4 (8.00%) high severe
+Benchmarking mixed_write/scalar/1000
+Benchmarking mixed_write/scalar/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/scalar/1000: Collecting 50 samples in estimated 2.0039 s (21k iterations)
+Benchmarking mixed_write/scalar/1000: Analyzing
+mixed_write/scalar/1000 time:   [95.096 µs 95.834 µs 96.703 µs]
+                        thrpt:  [413.24 MiB/s 416.99 MiB/s 420.23 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  6 (12.00%) high severe
+Benchmarking mixed_write/enum/1000
+Benchmarking mixed_write/enum/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/enum/1000: Collecting 50 samples in estimated 2.0016 s (25k iterations)
+Benchmarking mixed_write/enum/1000: Analyzing
+mixed_write/enum/1000   time:   [81.139 µs 82.089 µs 83.161 µs]
+                        thrpt:  [229.51 MiB/s 232.50 MiB/s 235.23 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  4 (8.00%) high mild
+  1 (2.00%) high severe
+Benchmarking mixed_write/pattern/1000
+Benchmarking mixed_write/pattern/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/pattern/1000: Collecting 50 samples in estimated 2.0060 s (14k iterations)
+Benchmarking mixed_write/pattern/1000: Analyzing
+mixed_write/pattern/1000
+                        time:   [144.42 µs 146.00 µs 147.85 µs]
+                        thrpt:  [122.64 MiB/s 124.19 MiB/s 125.55 MiB/s]
+Found 10 outliers among 50 measurements (20.00%)
+  4 (8.00%) high mild
+  6 (12.00%) high severe
+Benchmarking mixed_write/nested/1000
+Benchmarking mixed_write/nested/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/nested/1000: Collecting 50 samples in estimated 2.0004 s (20k iterations)
+Benchmarking mixed_write/nested/1000: Analyzing
+mixed_write/nested/1000 time:   [99.516 µs 101.40 µs 103.73 µs]
+                        thrpt:  [348.47 MiB/s 356.49 MiB/s 363.23 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  1 (2.00%) high mild
+  6 (12.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-screen/baseline-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-screen/baseline-1.txt
new file mode 100644
index 0000000..8b2fe37
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-screen/baseline-1.txt
@@ -0,0 +1,47 @@
+memcap: <=7741 MiB (60% of 12902 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_write/text/1000
+Benchmarking mixed_write/text/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/text/1000: Collecting 50 samples in estimated 2.0060 s (14k iterations)
+Benchmarking mixed_write/text/1000: Analyzing
+mixed_write/text/1000   time:   [145.00 µs 145.90 µs 146.85 µs]
+                        thrpt:  [187.71 MiB/s 188.92 MiB/s 190.10 MiB/s]
+Found 1 outliers among 50 measurements (2.00%)
+  1 (2.00%) high mild
+Benchmarking mixed_write/scalar/1000
+Benchmarking mixed_write/scalar/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/scalar/1000: Collecting 50 samples in estimated 2.0034 s (19k iterations)
+Benchmarking mixed_write/scalar/1000: Analyzing
+mixed_write/scalar/1000 time:   [105.25 µs 105.75 µs 106.34 µs]
+                        thrpt:  [375.81 MiB/s 377.88 MiB/s 379.70 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  3 (6.00%) high mild
+  1 (2.00%) high severe
+Benchmarking mixed_write/enum/1000
+Benchmarking mixed_write/enum/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/enum/1000: Collecting 50 samples in estimated 2.0009 s (25k iterations)
+Benchmarking mixed_write/enum/1000: Analyzing
+mixed_write/enum/1000   time:   [81.160 µs 82.560 µs 84.284 µs]
+                        thrpt:  [226.45 MiB/s 231.18 MiB/s 235.16 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  1 (2.00%) high mild
+  5 (10.00%) high severe
+Benchmarking mixed_write/pattern/1000
+Benchmarking mixed_write/pattern/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/pattern/1000: Collecting 50 samples in estimated 2.0004 s (14k iterations)
+Benchmarking mixed_write/pattern/1000: Analyzing
+mixed_write/pattern/1000
+                        time:   [142.93 µs 143.59 µs 144.44 µs]
+                        thrpt:  [125.53 MiB/s 126.28 MiB/s 126.86 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  5 (10.00%) high mild
+  1 (2.00%) high severe
+Benchmarking mixed_write/nested/1000
+Benchmarking mixed_write/nested/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/nested/1000: Collecting 50 samples in estimated 2.0014 s (21k iterations)
+Benchmarking mixed_write/nested/1000: Analyzing
+mixed_write/nested/1000 time:   [96.256 µs 96.652 µs 97.120 µs]
+                        thrpt:  [372.19 MiB/s 373.99 MiB/s 375.53 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  1 (2.00%) high mild
+  4 (8.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-screen/baseline-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-screen/baseline-build.txt
new file mode 100644
index 0000000..c03d3ad
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-screen/baseline-build.txt
@@ -0,0 +1,3 @@
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+    Finished `bench` profile [optimized] target(s) in 2.87s
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new file mode 100644
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-screen/criterion-SHA256SUMS b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-screen/criterion-SHA256SUMS
new file mode 100644
index 0000000..f31332f
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-screen/criterion-SHA256SUMS
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-screen/criterion-results.tar.gz b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-screen/criterion-results.tar.gz
new file mode 100644
index 0000000..8c3c557
Binary files /dev/null and b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-screen/criterion-results.tar.gz differ
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-screen/current-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-screen/current-0.txt
new file mode 100644
index 0000000..52773e8
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-screen/current-0.txt
@@ -0,0 +1,47 @@
+memcap: <=7739 MiB (60% of 12898 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_write/text/1000
+Benchmarking mixed_write/text/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/text/1000: Collecting 50 samples in estimated 2.0039 s (14k iterations)
+Benchmarking mixed_write/text/1000: Analyzing
+mixed_write/text/1000   time:   [140.34 µs 141.21 µs 142.18 µs]
+                        thrpt:  [193.87 MiB/s 195.20 MiB/s 196.41 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  4 (8.00%) high mild
+  2 (4.00%) high severe
+Benchmarking mixed_write/scalar/1000
+Benchmarking mixed_write/scalar/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/scalar/1000: Collecting 50 samples in estimated 2.0012 s (17k iterations)
+Benchmarking mixed_write/scalar/1000: Analyzing
+mixed_write/scalar/1000 time:   [115.52 µs 116.38 µs 117.41 µs]
+                        thrpt:  [340.36 MiB/s 343.38 MiB/s 345.92 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  3 (6.00%) high mild
+  4 (8.00%) high severe
+Benchmarking mixed_write/enum/1000
+Benchmarking mixed_write/enum/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/enum/1000: Collecting 50 samples in estimated 2.0017 s (23k iterations)
+Benchmarking mixed_write/enum/1000: Analyzing
+mixed_write/enum/1000   time:   [84.267 µs 85.147 µs 86.261 µs]
+                        thrpt:  [221.26 MiB/s 224.15 MiB/s 226.49 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  5 (10.00%) high severe
+Benchmarking mixed_write/pattern/1000
+Benchmarking mixed_write/pattern/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/pattern/1000: Collecting 50 samples in estimated 2.0025 s (14k iterations)
+Benchmarking mixed_write/pattern/1000: Analyzing
+mixed_write/pattern/1000
+                        time:   [147.99 µs 149.42 µs 151.20 µs]
+                        thrpt:  [119.92 MiB/s 121.35 MiB/s 122.52 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  4 (8.00%) high mild
+  2 (4.00%) high severe
+Benchmarking mixed_write/nested/1000
+Benchmarking mixed_write/nested/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/nested/1000: Collecting 50 samples in estimated 2.0035 s (19k iterations)
+Benchmarking mixed_write/nested/1000: Analyzing
+mixed_write/nested/1000 time:   [102.26 µs 102.78 µs 103.39 µs]
+                        thrpt:  [349.62 MiB/s 351.68 MiB/s 353.47 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  1 (2.00%) high mild
+  5 (10.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-screen/current-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-screen/current-1.txt
new file mode 100644
index 0000000..ebf1be5
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-screen/current-1.txt
@@ -0,0 +1,47 @@
+memcap: <=7741 MiB (60% of 12902 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_write/text/1000
+Benchmarking mixed_write/text/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/text/1000: Collecting 50 samples in estimated 2.0073 s (14k iterations)
+Benchmarking mixed_write/text/1000: Analyzing
+mixed_write/text/1000   time:   [141.45 µs 142.33 µs 143.36 µs]
+                        thrpt:  [192.27 MiB/s 193.66 MiB/s 194.87 MiB/s]
+Found 8 outliers among 50 measurements (16.00%)
+  2 (4.00%) high mild
+  6 (12.00%) high severe
+Benchmarking mixed_write/scalar/1000
+Benchmarking mixed_write/scalar/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/scalar/1000: Collecting 50 samples in estimated 2.0026 s (16k iterations)
+Benchmarking mixed_write/scalar/1000: Analyzing
+mixed_write/scalar/1000 time:   [119.48 µs 120.26 µs 121.29 µs]
+                        thrpt:  [329.47 MiB/s 332.30 MiB/s 334.45 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  2 (4.00%) high mild
+  3 (6.00%) high severe
+Benchmarking mixed_write/enum/1000
+Benchmarking mixed_write/enum/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/enum/1000: Collecting 50 samples in estimated 2.0020 s (24k iterations)
+Benchmarking mixed_write/enum/1000: Analyzing
+mixed_write/enum/1000   time:   [84.597 µs 85.876 µs 87.787 µs]
+                        thrpt:  [217.41 MiB/s 222.25 MiB/s 225.61 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  3 (6.00%) high mild
+  4 (8.00%) high severe
+Benchmarking mixed_write/pattern/1000
+Benchmarking mixed_write/pattern/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/pattern/1000: Collecting 50 samples in estimated 2.0008 s (13k iterations)
+Benchmarking mixed_write/pattern/1000: Analyzing
+mixed_write/pattern/1000
+                        time:   [147.30 µs 148.19 µs 149.34 µs]
+                        thrpt:  [121.42 MiB/s 122.36 MiB/s 123.09 MiB/s]
+Found 2 outliers among 50 measurements (4.00%)
+  2 (4.00%) high severe
+Benchmarking mixed_write/nested/1000
+Benchmarking mixed_write/nested/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/nested/1000: Collecting 50 samples in estimated 2.0013 s (19k iterations)
+Benchmarking mixed_write/nested/1000: Analyzing
+mixed_write/nested/1000 time:   [101.74 µs 102.57 µs 103.78 µs]
+                        thrpt:  [348.29 MiB/s 352.41 MiB/s 355.29 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  2 (4.00%) high mild
+  2 (4.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-screen/current-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-screen/current-build.txt
new file mode 100644
index 0000000..ecdc3c3
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-screen/current-build.txt
@@ -0,0 +1,4 @@
+memcap: <=7717 MiB (60% of 12863 MiB available) [systemd MemoryMax, swap off]
+   Compiling polyxml v0.34.6 (/home/bailey/github/polyxml-mixed-nil/crates/polyxml-core)
+   Compiling core-regression v0.0.0 (/home/bailey/github/polyxml-mixed-nil/benchmarks/rust-xml-regression/target/core-current)
+    Finished `bench` profile [optimized] target(s) in 27.02s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-screen/current.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-screen/current.lock
new file mode 100644
index 0000000..78a11b2
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+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-screen/current.lock
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-screen/harness.rs b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-screen/harness.rs
new file mode 100644
index 0000000..7d0413e
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-screen/harness.rs
@@ -0,0 +1,120 @@
+use criterion::{
+    criterion_group, criterion_main, BenchmarkId, Criterion, SamplingMode, Throughput,
+};
+use polyxml::schema::ModelSchema;
+use polyxml::schema_parser::XsdParser;
+use polyxml::{deserialize, serialize, PolyValue};
+use std::{hint::black_box, sync::Arc};
+
+fn fixture(kind: &str, count: usize) -> (Arc<ModelSchema>, Vec<u8>) {
+    let xsd = r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
+      <xs:simpleType name="State"><xs:restriction base="xs:string"><xs:enumeration value="Ready"/><xs:enumeration value="Done"/></xs:restriction></xs:simpleType>
+      <xs:simpleType name="Code"><xs:restriction base="xs:string"><xs:pattern value="[A-Z]{3}[0-9]{3}"/></xs:restriction></xs:simpleType>
+      <xs:element name="Root"><xs:complexType mixed="true"><xs:choice minOccurs="0" maxOccurs="unbounded">
+        <xs:element name="Text" type="xs:string"/>
+        <xs:element name="Number" type="xs:int"/>
+        <xs:element name="State" type="State"/>
+        <xs:element name="Code" type="Code"/>
+        <xs:element name="Child"><xs:complexType><xs:sequence><xs:element name="Value" type="xs:string"/></xs:sequence></xs:complexType></xs:element>
+      </xs:choice></xs:complexType></xs:element>
+    </xs:schema>"#;
+    let ir = XsdParser::new().parse_str(xsd).unwrap();
+    let schema = ModelSchema::from_ir(&ir, Some("Root")).unwrap();
+    let mut xml = String::from("<Root>");
+    for index in 0..count {
+        let part = match kind {
+            "text" => format!("text-{index}&amp;<![CDATA[more]]>"),
+            "scalar" => format!("<Text>item-{index}&amp;<![CDATA[more]]></Text>"),
+            "enum" => "<State>Ready</State>".into(),
+            "pattern" => format!("<Code>ABC{:03}</Code>", index % 1000),
+            "nested" => format!("<Child><Value>item-{index}</Value></Child>"),
+            _ => unreachable!(),
+        };
+        xml.push_str(&part);
+    }
+    xml.push_str("</Root>");
+    let value = deserialize(xml.as_bytes(), Arc::clone(&schema)).unwrap();
+    let items_name = &schema.fields[schema.mixed_content.as_ref().unwrap().items_index].name;
+    let items = value.get(items_name).and_then(PolyValue::as_list).unwrap();
+    if kind == "text" {
+        // Text, GeneralRef and CData become separate ordered items.
+        assert_eq!(items.len(), count * 3);
+        for (index, items) in items.chunks_exact(3).enumerate() {
+            for (item, expected) in
+                items
+                    .iter()
+                    .zip([format!("text-{index}"), "&".into(), "more".into()])
+            {
+                assert_eq!(item.get("kind").and_then(PolyValue::as_str), Some("#text"));
+                assert_eq!(
+                    item.get("value").and_then(PolyValue::as_str),
+                    Some(expected.as_str())
+                );
+            }
+        }
+    } else {
+        assert_eq!(items.len(), count);
+        for (index, item) in items.iter().enumerate() {
+            let value = item.get("value").unwrap();
+            match kind {
+                "scalar" => assert_eq!(value.as_str(), Some(format!("item-{index}&more").as_str())),
+                "enum" => assert_eq!(value.as_str(), Some("Ready")),
+                "pattern" => assert_eq!(
+                    value.as_str(),
+                    Some(format!("ABC{:03}", index % 1000).as_str())
+                ),
+                "nested" => assert_eq!(
+                    value.get("value").and_then(PolyValue::as_str),
+                    Some(format!("item-{index}").as_str())
+                ),
+                _ => unreachable!(),
+            }
+        }
+    }
+    let output = serialize("Root", &value, &schema, None).unwrap();
+    let reparsed = deserialize(&output, Arc::clone(&schema)).unwrap();
+    if kind == "text" {
+        // XML writers coalesce adjacent text segments. Compare their text value
+        // rather than treating the reader's segmentation as XML semantics.
+        let text = |value: &PolyValue| -> String {
+            value
+                .get(items_name)
+                .unwrap()
+                .as_list()
+                .unwrap()
+                .iter()
+                .map(|item| item.get("value").unwrap().as_str().unwrap())
+                .collect()
+        };
+        assert_eq!(text(&value), text(&reparsed));
+    } else {
+        assert_eq!(value, reparsed);
+    }
+    (schema, xml.into_bytes())
+}
+
+fn benchmarks(c: &mut Criterion) {
+    for operation in ["mixed_read", "mixed_write"] {
+        let mut group = c.benchmark_group(operation);
+        group.sampling_mode(SamplingMode::Flat);
+        for kind in ["text", "scalar", "enum", "pattern", "nested"] {
+            let (schema, xml) = fixture(kind, 1000);
+            let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+            group.throughput(Throughput::Bytes(xml.len() as u64));
+            group.bench_function(BenchmarkId::new(kind, 1000), |b| {
+                if operation == "mixed_read" {
+                    b.iter(|| {
+                        black_box(deserialize(black_box(&xml), Arc::clone(&schema)).unwrap())
+                    });
+                } else {
+                    b.iter(|| {
+                        black_box(serialize("Root", black_box(&value), &schema, None).unwrap())
+                    });
+                }
+            });
+        }
+        group.finish();
+    }
+}
+criterion_group!(benches, benchmarks);
+criterion_main!(benches);
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-screen/metadata.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-screen/metadata.json
new file mode 100644
index 0000000..cf14a1a
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-screen/metadata.json
@@ -0,0 +1,19 @@
+{
+  "revisions": {
+    "baseline": "1819c91b0808b9242c642d82350d2b657b60108c",
+    "current": "121ac4b888fd434060d13fc886835a2fd46d684c"
+  },
+  "core_status": {
+    "baseline": "",
+    "current": ""
+  },
+  "sample_size": 50,
+  "warmup_seconds": 1.0,
+  "measurement_seconds": 2.0,
+  "rounds": 2,
+  "filter": "^mixed_write/",
+  "order": "alternate baseline/current per round",
+  "os": "Linux-6.18.40.1-microsoft-standard-WSL2-x86_64-with-glibc2.43",
+  "cpu": "11th Gen Intel(R) Core(TM) i5-11600K @ 3.90GHz",
+  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)\nbinary: rustc\ncommit-hash: b940084d7eb6a299eb4bfeb8e34901bc051e7ac4\ncommit-date: 2026-09-28\nhost: x86_64-unknown-linux-gnu\nrelease: 1.99.0\nLLVM version: 23.1.1\n"
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-screen/summary.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-screen/summary.json
new file mode 100644
index 0000000..fdc0e3e
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-cold-screen/summary.json
@@ -0,0 +1,262 @@
+{
+  "mixed_write/enum/1000": {
+    "baseline_ns": 82324.30772316181,
+    "candidate_ns": 85511.4220036346,
+    "delta_percent": 3.8714133997826528,
+    "speedup": 0.962728788671795,
+    "process_deltas_percent": [
+      3.7252229809041193,
+      4.0167703843650315
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 81138.796152834,
+            "upper_bound": 83160.82836032388
+          },
+          "point_estimate": 82088.9706882591,
+          "standard_error": 516.7389230720354
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 81159.57947681451,
+            "upper_bound": 84284.20538608868
+          },
+          "point_estimate": 82559.64475806452,
+          "standard_error": 802.3016924406211
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 84267.18686247332,
+            "upper_bound": 86260.6841513859
+          },
+          "point_estimate": 85146.96788912578,
+          "standard_error": 513.7170639697724
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 84596.78713291136,
+            "upper_bound": 87787.4828154008
+          },
+          "point_estimate": 85875.87611814342,
+          "standard_error": 839.1597824237916
+        }
+      ]
+    }
+  },
+  "mixed_write/nested/1000": {
+    "baseline_ns": 99024.08783654678,
+    "candidate_ns": 102678.1218898424,
+    "delta_percent": 3.6900456577061425,
+    "speedup": 0.9644127299366089,
+    "process_deltas_percent": [
+      1.369407306149184,
+      6.124605552492635
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 99516.40623950613,
+            "upper_bound": 103731.2066790124
+          },
+          "point_estimate": 101396.43412345677,
+          "standard_error": 1082.587637821148
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 96256.00109564165,
+            "upper_bound": 97119.50542615012
+          },
+          "point_estimate": 96651.74154963679,
+          "standard_error": 221.16482393547386
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 102262.3175919689,
+            "upper_bound": 103390.2336761658
+          },
+          "point_estimate": 102784.96430051813,
+          "standard_error": 288.06059258644456
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 101740.32558463539,
+            "upper_bound": 103783.52049479166
+          },
+          "point_estimate": 102571.27947916667,
+          "standard_error": 534.2047548329198
+        }
+      ]
+    }
+  },
+  "mixed_write/pattern/1000": {
+    "baseline_ns": 144793.78810131678,
+    "candidate_ns": 148807.03695527598,
+    "delta_percent": 2.7716996057531196,
+    "speedup": 0.9730305169965491,
+    "process_deltas_percent": [
+      2.3448680959197166,
+      3.205694016313343
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 144424.0691942446,
+            "upper_bound": 147845.9972122302
+          },
+          "point_estimate": 145998.6118705036,
+          "standard_error": 879.0869488174081
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 142932.04763176895,
+            "upper_bound": 144439.58590433214
+          },
+          "point_estimate": 143588.96433212992,
+          "standard_error": 388.8955618958993
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 147991.39466666663,
+            "upper_bound": 151201.28762962957
+          },
+          "point_estimate": 149422.0867407407,
+          "standard_error": 824.3501176689654
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 147302.81826603774,
+            "upper_bound": 149339.4611283019
+          },
+          "point_estimate": 148191.9871698113,
+          "standard_error": 522.8049841050928
+        }
+      ]
+    }
+  },
+  "mixed_write/scalar/1000": {
+    "baseline_ns": 100793.7799250979,
+    "candidate_ns": 118317.64756835799,
+    "delta_percent": 17.38586215963174,
+    "speedup": 0.8518913450072131,
+    "process_deltas_percent": [
+      21.437237669184483,
+      13.714505851019654
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 95095.721075,
+            "upper_bound": 96702.54856428572
+          },
+          "point_estimate": 95833.93247619047,
+          "standard_error": 412.4958091721238
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 105245.31862732097,
+            "upper_bound": 106335.09169230773
+          },
+          "point_estimate": 105753.62737400533,
+          "standard_error": 278.34840236457836
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 115523.09909011624,
+            "upper_bound": 117410.05964680236
+          },
+          "point_estimate": 116378.08034883719,
+          "standard_error": 484.90364660593474
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 119484.51301818187,
+            "upper_bound": 121291.63984848485
+          },
+          "point_estimate": 120257.21478787881,
+          "standard_error": 467.43336701640135
+        }
+      ]
+    }
+  },
+  "mixed_write/text/1000": {
+    "baseline_ns": 147040.41802773063,
+    "candidate_ns": 141772.15208553936,
+    "delta_percent": -3.5828692633325554,
+    "speedup": 1.0371600900789926,
+    "process_deltas_percent": [
+      -4.702060344495418,
+      -2.4462030023114756
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 146051.42024060147,
+            "upper_bound": 150981.0667857143
+          },
+          "point_estimate": 148179.47842105269,
+          "standard_error": 1279.237379845318
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 145000.27641039426,
+            "upper_bound": 146845.4696577061
+          },
+          "point_estimate": 145901.35763440857,
+          "standard_error": 470.57875180833526
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 140336.32124456522,
+            "upper_bound": 142180.34248188403
+          },
+          "point_estimate": 141211.98992753623,
+          "standard_error": 470.67758932123223
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 141447.78706088563,
+            "upper_bound": 143364.63179335796
+          },
+          "point_estimate": 142332.31424354247,
+          "standard_error": 493.5956573028295
+        }
+      ]
+    }
+  }
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/baseline-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/baseline-0.txt
new file mode 100644
index 0000000..f2cca8f
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/baseline-0.txt
@@ -0,0 +1,94 @@
+memcap: <=7679 MiB (60% of 12798 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_read/text/1000
+Benchmarking mixed_read/text/1000: Warming up for 3.0000 s
+Benchmarking mixed_read/text/1000: Collecting 100 samples in estimated 5.0519 s (6100 iterations)
+Benchmarking mixed_read/text/1000: Analyzing
+mixed_read/text/1000    time:   [787.44 µs 792.44 µs 798.56 µs]
+                        thrpt:  [34.517 MiB/s 34.784 MiB/s 35.005 MiB/s]
+Found 12 outliers among 100 measurements (12.00%)
+  5 (5.00%) high mild
+  7 (7.00%) high severe
+Benchmarking mixed_read/scalar/1000
+Benchmarking mixed_read/scalar/1000: Warming up for 3.0000 s
+Benchmarking mixed_read/scalar/1000: Collecting 100 samples in estimated 5.0125 s (13k iterations)
+Benchmarking mixed_read/scalar/1000: Analyzing
+mixed_read/scalar/1000  time:   [389.84 µs 391.64 µs 393.70 µs]
+                        thrpt:  [101.50 MiB/s 102.04 MiB/s 102.51 MiB/s]
+Found 11 outliers among 100 measurements (11.00%)
+  7 (7.00%) high mild
+  4 (4.00%) high severe
+Benchmarking mixed_read/enum/1000
+Benchmarking mixed_read/enum/1000: Warming up for 3.0000 s
+Benchmarking mixed_read/enum/1000: Collecting 100 samples in estimated 5.0180 s (15k iterations)
+Benchmarking mixed_read/enum/1000: Analyzing
+mixed_read/enum/1000    time:   [322.39 µs 323.89 µs 325.55 µs]
+                        thrpt:  [58.627 MiB/s 58.927 MiB/s 59.201 MiB/s]
+Found 12 outliers among 100 measurements (12.00%)
+  7 (7.00%) high mild
+  5 (5.00%) high severe
+Benchmarking mixed_read/pattern/1000
+Benchmarking mixed_read/pattern/1000: Warming up for 3.0000 s
+Benchmarking mixed_read/pattern/1000: Collecting 100 samples in estimated 5.0171 s (12k iterations)
+Benchmarking mixed_read/pattern/1000: Analyzing
+mixed_read/pattern/1000 time:   [403.70 µs 405.44 µs 407.41 µs]
+                        thrpt:  [44.506 MiB/s 44.722 MiB/s 44.915 MiB/s]
+Found 10 outliers among 100 measurements (10.00%)
+  3 (3.00%) high mild
+  7 (7.00%) high severe
+Benchmarking mixed_read/nested/1000
+Benchmarking mixed_read/nested/1000: Warming up for 3.0000 s
+Benchmarking mixed_read/nested/1000: Collecting 100 samples in estimated 5.0363 s (8000 iterations)
+Benchmarking mixed_read/nested/1000: Analyzing
+mixed_read/nested/1000  time:   [632.70 µs 640.64 µs 650.75 µs]
+                        thrpt:  [55.547 MiB/s 56.423 MiB/s 57.131 MiB/s]
+Found 10 outliers among 100 measurements (10.00%)
+  6 (6.00%) high mild
+  4 (4.00%) high severe
+
+Benchmarking mixed_write/text/1000
+Benchmarking mixed_write/text/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/text/1000: Collecting 100 samples in estimated 5.0088 s (34k iterations)
+Benchmarking mixed_write/text/1000: Analyzing
+mixed_write/text/1000   time:   [144.92 µs 145.88 µs 147.06 µs]
+                        thrpt:  [187.43 MiB/s 188.95 MiB/s 190.20 MiB/s]
+Found 10 outliers among 100 measurements (10.00%)
+  5 (5.00%) high mild
+  5 (5.00%) high severe
+Benchmarking mixed_write/scalar/1000
+Benchmarking mixed_write/scalar/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/scalar/1000: Collecting 100 samples in estimated 5.0084 s (47k iterations)
+Benchmarking mixed_write/scalar/1000: Analyzing
+mixed_write/scalar/1000 time:   [105.90 µs 106.78 µs 107.91 µs]
+                        thrpt:  [370.33 MiB/s 374.25 MiB/s 377.35 MiB/s]
+Found 13 outliers among 100 measurements (13.00%)
+  6 (6.00%) high mild
+  7 (7.00%) high severe
+Benchmarking mixed_write/enum/1000
+Benchmarking mixed_write/enum/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/enum/1000: Collecting 100 samples in estimated 5.0028 s (62k iterations)
+Benchmarking mixed_write/enum/1000: Analyzing
+mixed_write/enum/1000   time:   [80.231 µs 81.092 µs 82.252 µs]
+                        thrpt:  [232.04 MiB/s 235.36 MiB/s 237.89 MiB/s]
+Found 13 outliers among 100 measurements (13.00%)
+  6 (6.00%) high mild
+  7 (7.00%) high severe
+Benchmarking mixed_write/pattern/1000
+Benchmarking mixed_write/pattern/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/pattern/1000: Collecting 100 samples in estimated 5.0018 s (31k iterations)
+Benchmarking mixed_write/pattern/1000: Analyzing
+mixed_write/pattern/1000
+                        time:   [164.38 µs 165.69 µs 167.39 µs]
+                        thrpt:  [108.32 MiB/s 109.44 MiB/s 110.31 MiB/s]
+Found 10 outliers among 100 measurements (10.00%)
+  4 (4.00%) high mild
+  6 (6.00%) high severe
+Benchmarking mixed_write/nested/1000
+Benchmarking mixed_write/nested/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/nested/1000: Collecting 100 samples in estimated 5.0070 s (50k iterations)
+Benchmarking mixed_write/nested/1000: Analyzing
+mixed_write/nested/1000 time:   [98.713 µs 99.189 µs 99.731 µs]
+                        thrpt:  [362.45 MiB/s 364.43 MiB/s 366.19 MiB/s]
+Found 10 outliers among 100 measurements (10.00%)
+  7 (7.00%) high mild
+  3 (3.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/baseline-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/baseline-1.txt
new file mode 100644
index 0000000..9aae272
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/baseline-1.txt
@@ -0,0 +1,94 @@
+memcap: <=7738 MiB (60% of 12897 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_read/text/1000
+Benchmarking mixed_read/text/1000: Warming up for 3.0000 s
+Benchmarking mixed_read/text/1000: Collecting 100 samples in estimated 5.0381 s (6800 iterations)
+Benchmarking mixed_read/text/1000: Analyzing
+mixed_read/text/1000    time:   [719.14 µs 722.87 µs 727.34 µs]
+                        thrpt:  [37.897 MiB/s 38.131 MiB/s 38.329 MiB/s]
+Found 8 outliers among 100 measurements (8.00%)
+  1 (1.00%) high mild
+  7 (7.00%) high severe
+Benchmarking mixed_read/scalar/1000
+Benchmarking mixed_read/scalar/1000: Warming up for 3.0000 s
+Benchmarking mixed_read/scalar/1000: Collecting 100 samples in estimated 5.0313 s (13k iterations)
+Benchmarking mixed_read/scalar/1000: Analyzing
+mixed_read/scalar/1000  time:   [390.84 µs 393.28 µs 396.14 µs]
+                        thrpt:  [100.88 MiB/s 101.61 MiB/s 102.25 MiB/s]
+Found 8 outliers among 100 measurements (8.00%)
+  3 (3.00%) high mild
+  5 (5.00%) high severe
+Benchmarking mixed_read/enum/1000
+Benchmarking mixed_read/enum/1000: Warming up for 3.0000 s
+Benchmarking mixed_read/enum/1000: Collecting 100 samples in estimated 5.0040 s (15k iterations)
+Benchmarking mixed_read/enum/1000: Analyzing
+mixed_read/enum/1000    time:   [323.03 µs 324.99 µs 327.47 µs]
+                        thrpt:  [58.283 MiB/s 58.728 MiB/s 59.084 MiB/s]
+Found 9 outliers among 100 measurements (9.00%)
+  4 (4.00%) high mild
+  5 (5.00%) high severe
+Benchmarking mixed_read/pattern/1000
+Benchmarking mixed_read/pattern/1000: Warming up for 3.0000 s
+Benchmarking mixed_read/pattern/1000: Collecting 100 samples in estimated 5.0334 s (12k iterations)
+Benchmarking mixed_read/pattern/1000: Analyzing
+mixed_read/pattern/1000 time:   [405.48 µs 407.84 µs 410.82 µs]
+                        thrpt:  [44.137 MiB/s 44.459 MiB/s 44.718 MiB/s]
+Found 6 outliers among 100 measurements (6.00%)
+  3 (3.00%) high mild
+  3 (3.00%) high severe
+Benchmarking mixed_read/nested/1000
+Benchmarking mixed_read/nested/1000: Warming up for 3.0000 s
+Benchmarking mixed_read/nested/1000: Collecting 100 samples in estimated 5.0377 s (8000 iterations)
+Benchmarking mixed_read/nested/1000: Analyzing
+mixed_read/nested/1000  time:   [628.97 µs 634.19 µs 640.91 µs]
+                        thrpt:  [56.400 MiB/s 56.998 MiB/s 57.470 MiB/s]
+Found 12 outliers among 100 measurements (12.00%)
+  6 (6.00%) high mild
+  6 (6.00%) high severe
+
+Benchmarking mixed_write/text/1000
+Benchmarking mixed_write/text/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/text/1000: Collecting 100 samples in estimated 5.0125 s (34k iterations)
+Benchmarking mixed_write/text/1000: Analyzing
+mixed_write/text/1000   time:   [144.41 µs 144.97 µs 145.61 µs]
+                        thrpt:  [189.30 MiB/s 190.13 MiB/s 190.88 MiB/s]
+Found 13 outliers among 100 measurements (13.00%)
+  8 (8.00%) high mild
+  5 (5.00%) high severe
+Benchmarking mixed_write/scalar/1000
+Benchmarking mixed_write/scalar/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/scalar/1000: Collecting 100 samples in estimated 5.0004 s (51k iterations)
+Benchmarking mixed_write/scalar/1000: Analyzing
+mixed_write/scalar/1000 time:   [97.024 µs 97.474 µs 97.994 µs]
+                        thrpt:  [407.80 MiB/s 409.97 MiB/s 411.87 MiB/s]
+Found 7 outliers among 100 measurements (7.00%)
+  3 (3.00%) high mild
+  4 (4.00%) high severe
+Benchmarking mixed_write/enum/1000
+Benchmarking mixed_write/enum/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/enum/1000: Collecting 100 samples in estimated 5.0007 s (62k iterations)
+Benchmarking mixed_write/enum/1000: Analyzing
+mixed_write/enum/1000   time:   [80.466 µs 80.982 µs 81.564 µs]
+                        thrpt:  [234.00 MiB/s 235.68 MiB/s 237.19 MiB/s]
+Found 9 outliers among 100 measurements (9.00%)
+  5 (5.00%) high mild
+  4 (4.00%) high severe
+Benchmarking mixed_write/pattern/1000
+Benchmarking mixed_write/pattern/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/pattern/1000: Collecting 100 samples in estimated 5.0099 s (34k iterations)
+Benchmarking mixed_write/pattern/1000: Analyzing
+mixed_write/pattern/1000
+                        time:   [143.57 µs 144.47 µs 145.61 µs]
+                        thrpt:  [124.53 MiB/s 125.51 MiB/s 126.29 MiB/s]
+Found 15 outliers among 100 measurements (15.00%)
+  5 (5.00%) high mild
+  10 (10.00%) high severe
+Benchmarking mixed_write/nested/1000
+Benchmarking mixed_write/nested/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/nested/1000: Collecting 100 samples in estimated 5.0069 s (51k iterations)
+Benchmarking mixed_write/nested/1000: Analyzing
+mixed_write/nested/1000 time:   [98.527 µs 99.166 µs 99.925 µs]
+                        thrpt:  [361.74 MiB/s 364.51 MiB/s 366.87 MiB/s]
+Found 18 outliers among 100 measurements (18.00%)
+  10 (10.00%) high mild
+  8 (8.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/baseline-2.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/baseline-2.txt
new file mode 100644
index 0000000..96113be
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/baseline-2.txt
@@ -0,0 +1,93 @@
+memcap: <=7740 MiB (60% of 12901 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_read/text/1000
+Benchmarking mixed_read/text/1000: Warming up for 3.0000 s
+Benchmarking mixed_read/text/1000: Collecting 100 samples in estimated 5.0262 s (6200 iterations)
+Benchmarking mixed_read/text/1000: Analyzing
+mixed_read/text/1000    time:   [786.64 µs 788.82 µs 791.18 µs]
+                        thrpt:  [34.839 MiB/s 34.943 MiB/s 35.040 MiB/s]
+Found 12 outliers among 100 measurements (12.00%)
+  7 (7.00%) high mild
+  5 (5.00%) high severe
+Benchmarking mixed_read/scalar/1000
+Benchmarking mixed_read/scalar/1000: Warming up for 3.0000 s
+Benchmarking mixed_read/scalar/1000: Collecting 100 samples in estimated 5.0036 s (12k iterations)
+Benchmarking mixed_read/scalar/1000: Analyzing
+mixed_read/scalar/1000  time:   [399.36 µs 401.53 µs 404.28 µs]
+                        thrpt:  [98.847 MiB/s 99.524 MiB/s 100.06 MiB/s]
+Found 9 outliers among 100 measurements (9.00%)
+  1 (1.00%) high mild
+  8 (8.00%) high severe
+Benchmarking mixed_read/enum/1000
+Benchmarking mixed_read/enum/1000: Warming up for 3.0000 s
+Benchmarking mixed_read/enum/1000: Collecting 100 samples in estimated 5.0225 s (15k iterations)
+Benchmarking mixed_read/enum/1000: Analyzing
+mixed_read/enum/1000    time:   [323.21 µs 324.56 µs 326.05 µs]
+                        thrpt:  [58.536 MiB/s 58.806 MiB/s 59.052 MiB/s]
+Found 12 outliers among 100 measurements (12.00%)
+  8 (8.00%) high mild
+  4 (4.00%) high severe
+Benchmarking mixed_read/pattern/1000
+Benchmarking mixed_read/pattern/1000: Warming up for 3.0000 s
+Benchmarking mixed_read/pattern/1000: Collecting 100 samples in estimated 5.0092 s (12k iterations)
+Benchmarking mixed_read/pattern/1000: Analyzing
+mixed_read/pattern/1000 time:   [406.92 µs 409.33 µs 412.49 µs]
+                        thrpt:  [43.957 MiB/s 44.297 MiB/s 44.560 MiB/s]
+Found 9 outliers among 100 measurements (9.00%)
+  2 (2.00%) high mild
+  7 (7.00%) high severe
+Benchmarking mixed_read/nested/1000
+Benchmarking mixed_read/nested/1000: Warming up for 3.0000 s
+Benchmarking mixed_read/nested/1000: Collecting 100 samples in estimated 5.0626 s (7800 iterations)
+Benchmarking mixed_read/nested/1000: Analyzing
+mixed_read/nested/1000  time:   [645.85 µs 648.96 µs 652.45 µs]
+                        thrpt:  [55.402 MiB/s 55.700 MiB/s 55.968 MiB/s]
+Found 13 outliers among 100 measurements (13.00%)
+  2 (2.00%) high mild
+  11 (11.00%) high severe
+
+Benchmarking mixed_write/text/1000
+Benchmarking mixed_write/text/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/text/1000: Collecting 100 samples in estimated 5.0143 s (34k iterations)
+Benchmarking mixed_write/text/1000: Analyzing
+mixed_write/text/1000   time:   [145.91 µs 146.73 µs 147.66 µs]
+                        thrpt:  [186.68 MiB/s 187.85 MiB/s 188.91 MiB/s]
+Found 14 outliers among 100 measurements (14.00%)
+  4 (4.00%) high mild
+  10 (10.00%) high severe
+Benchmarking mixed_write/scalar/1000
+Benchmarking mixed_write/scalar/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/scalar/1000: Collecting 100 samples in estimated 5.0019 s (52k iterations)
+Benchmarking mixed_write/scalar/1000: Analyzing
+mixed_write/scalar/1000 time:   [96.508 µs 97.128 µs 97.851 µs]
+                        thrpt:  [408.40 MiB/s 411.44 MiB/s 414.08 MiB/s]
+Found 11 outliers among 100 measurements (11.00%)
+  11 (11.00%) high severe
+Benchmarking mixed_write/enum/1000
+Benchmarking mixed_write/enum/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/enum/1000: Collecting 100 samples in estimated 5.0034 s (62k iterations)
+Benchmarking mixed_write/enum/1000: Analyzing
+mixed_write/enum/1000   time:   [81.210 µs 81.756 µs 82.449 µs]
+                        thrpt:  [231.49 MiB/s 233.45 MiB/s 235.02 MiB/s]
+Found 11 outliers among 100 measurements (11.00%)
+  2 (2.00%) high mild
+  9 (9.00%) high severe
+Benchmarking mixed_write/pattern/1000
+Benchmarking mixed_write/pattern/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/pattern/1000: Collecting 100 samples in estimated 5.0003 s (34k iterations)
+Benchmarking mixed_write/pattern/1000: Analyzing
+mixed_write/pattern/1000
+                        time:   [143.57 µs 144.29 µs 145.15 µs]
+                        thrpt:  [124.92 MiB/s 125.67 MiB/s 126.29 MiB/s]
+Found 8 outliers among 100 measurements (8.00%)
+  2 (2.00%) high mild
+  6 (6.00%) high severe
+Benchmarking mixed_write/nested/1000
+Benchmarking mixed_write/nested/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/nested/1000: Collecting 100 samples in estimated 5.0069 s (51k iterations)
+Benchmarking mixed_write/nested/1000: Analyzing
+mixed_write/nested/1000 time:   [98.257 µs 98.971 µs 99.808 µs]
+                        thrpt:  [362.17 MiB/s 365.23 MiB/s 367.88 MiB/s]
+Found 12 outliers among 100 measurements (12.00%)
+  3 (3.00%) high mild
+  9 (9.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/baseline-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/baseline-build.txt
new file mode 100644
index 0000000..4c97fd8
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/baseline-build.txt
@@ -0,0 +1,3 @@
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+    Finished `bench` profile [optimized] target(s) in 2.86s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/baseline.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/baseline.lock
new file mode 100644
index 0000000..78a11b2
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new file mode 100644
index 0000000..fe1b58a
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/criterion-SHA256SUMS
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+d68d1cb13bc4c6a7b3e4aa8065fb376fad7be0898c84236a8abc6e66c2f8e182  current-2/mixed_write/text/1000/base/benchmark.json
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+6a4fa4adf0f5bc05bb24d6195463e7331ee142599c44b9d7725f9b0ef378510a  current-2/mixed_write/text/1000/new/estimates.json
+caebbc9838d0510b1fe1f5ba073cf0809785706ef3321f12baf282c2257859c2  current-2/mixed_write/text/1000/new/sample.json
+9d617f851850d12fab916ef813684a20f19f7127292eca6cca94e4398c5ce9b8  current-2/mixed_write/text/1000/new/tukey.json
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/criterion-results.tar.gz b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/criterion-results.tar.gz
new file mode 100644
index 0000000..a81777a
Binary files /dev/null and b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/criterion-results.tar.gz differ
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/current-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/current-0.txt
new file mode 100644
index 0000000..961961e
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/current-0.txt
@@ -0,0 +1,94 @@
+memcap: <=7749 MiB (60% of 12915 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_read/text/1000
+Benchmarking mixed_read/text/1000: Warming up for 3.0000 s
+Benchmarking mixed_read/text/1000: Collecting 100 samples in estimated 5.0766 s (6500 iterations)
+Benchmarking mixed_read/text/1000: Analyzing
+mixed_read/text/1000    time:   [775.88 µs 783.34 µs 792.29 µs]
+                        thrpt:  [34.790 MiB/s 35.188 MiB/s 35.526 MiB/s]
+Found 13 outliers among 100 measurements (13.00%)
+  3 (3.00%) high mild
+  10 (10.00%) high severe
+Benchmarking mixed_read/scalar/1000
+Benchmarking mixed_read/scalar/1000: Warming up for 3.0000 s
+Benchmarking mixed_read/scalar/1000: Collecting 100 samples in estimated 5.0212 s (13k iterations)
+Benchmarking mixed_read/scalar/1000: Analyzing
+mixed_read/scalar/1000  time:   [386.30 µs 388.48 µs 390.96 µs]
+                        thrpt:  [102.21 MiB/s 102.87 MiB/s 103.45 MiB/s]
+Found 13 outliers among 100 measurements (13.00%)
+  8 (8.00%) high mild
+  5 (5.00%) high severe
+Benchmarking mixed_read/enum/1000
+Benchmarking mixed_read/enum/1000: Warming up for 3.0000 s
+Benchmarking mixed_read/enum/1000: Collecting 100 samples in estimated 5.0210 s (16k iterations)
+Benchmarking mixed_read/enum/1000: Analyzing
+mixed_read/enum/1000    time:   [320.14 µs 321.91 µs 324.25 µs]
+                        thrpt:  [58.861 MiB/s 59.290 MiB/s 59.618 MiB/s]
+Found 15 outliers among 100 measurements (15.00%)
+  6 (6.00%) high mild
+  9 (9.00%) high severe
+Benchmarking mixed_read/pattern/1000
+Benchmarking mixed_read/pattern/1000: Warming up for 3.0000 s
+Benchmarking mixed_read/pattern/1000: Collecting 100 samples in estimated 5.0202 s (12k iterations)
+Benchmarking mixed_read/pattern/1000: Analyzing
+mixed_read/pattern/1000 time:   [401.14 µs 403.05 µs 405.23 µs]
+                        thrpt:  [44.745 MiB/s 44.988 MiB/s 45.202 MiB/s]
+Found 14 outliers among 100 measurements (14.00%)
+  5 (5.00%) high mild
+  9 (9.00%) high severe
+Benchmarking mixed_read/nested/1000
+Benchmarking mixed_read/nested/1000: Warming up for 3.0000 s
+Benchmarking mixed_read/nested/1000: Collecting 100 samples in estimated 5.0425 s (7900 iterations)
+Benchmarking mixed_read/nested/1000: Analyzing
+mixed_read/nested/1000  time:   [625.26 µs 628.35 µs 631.86 µs]
+                        thrpt:  [57.208 MiB/s 57.527 MiB/s 57.812 MiB/s]
+Found 13 outliers among 100 measurements (13.00%)
+  9 (9.00%) high mild
+  4 (4.00%) high severe
+
+Benchmarking mixed_write/text/1000
+Benchmarking mixed_write/text/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/text/1000: Collecting 100 samples in estimated 5.0087 s (32k iterations)
+Benchmarking mixed_write/text/1000: Analyzing
+mixed_write/text/1000   time:   [145.57 µs 147.16 µs 149.12 µs]
+                        thrpt:  [184.84 MiB/s 187.31 MiB/s 189.36 MiB/s]
+Found 12 outliers among 100 measurements (12.00%)
+  5 (5.00%) high mild
+  7 (7.00%) high severe
+Benchmarking mixed_write/scalar/1000
+Benchmarking mixed_write/scalar/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/scalar/1000: Collecting 100 samples in estimated 5.0004 s (46k iterations)
+Benchmarking mixed_write/scalar/1000: Analyzing
+mixed_write/scalar/1000 time:   [108.48 µs 108.90 µs 109.37 µs]
+                        thrpt:  [365.38 MiB/s 366.95 MiB/s 368.37 MiB/s]
+Found 9 outliers among 100 measurements (9.00%)
+  6 (6.00%) high mild
+  3 (3.00%) high severe
+Benchmarking mixed_write/enum/1000
+Benchmarking mixed_write/enum/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/enum/1000: Collecting 100 samples in estimated 5.0006 s (63k iterations)
+Benchmarking mixed_write/enum/1000: Analyzing
+mixed_write/enum/1000   time:   [79.160 µs 79.659 µs 80.259 µs]
+                        thrpt:  [237.80 MiB/s 239.60 MiB/s 241.10 MiB/s]
+Found 16 outliers among 100 measurements (16.00%)
+  8 (8.00%) high mild
+  8 (8.00%) high severe
+Benchmarking mixed_write/pattern/1000
+Benchmarking mixed_write/pattern/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/pattern/1000: Collecting 100 samples in estimated 5.0118 s (30k iterations)
+Benchmarking mixed_write/pattern/1000: Analyzing
+mixed_write/pattern/1000
+                        time:   [144.17 µs 144.84 µs 145.62 µs]
+                        thrpt:  [124.52 MiB/s 125.19 MiB/s 125.77 MiB/s]
+Found 11 outliers among 100 measurements (11.00%)
+  5 (5.00%) high mild
+  6 (6.00%) high severe
+Benchmarking mixed_write/nested/1000
+Benchmarking mixed_write/nested/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/nested/1000: Collecting 100 samples in estimated 5.0012 s (50k iterations)
+Benchmarking mixed_write/nested/1000: Analyzing
+mixed_write/nested/1000 time:   [99.094 µs 99.782 µs 100.66 µs]
+                        thrpt:  [359.12 MiB/s 362.26 MiB/s 364.78 MiB/s]
+Found 13 outliers among 100 measurements (13.00%)
+  6 (6.00%) high mild
+  7 (7.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/current-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/current-1.txt
new file mode 100644
index 0000000..150bccc
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/current-1.txt
@@ -0,0 +1,94 @@
+memcap: <=7744 MiB (60% of 12907 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_read/text/1000
+Benchmarking mixed_read/text/1000: Warming up for 3.0000 s
+Benchmarking mixed_read/text/1000: Collecting 100 samples in estimated 5.0352 s (6400 iterations)
+Benchmarking mixed_read/text/1000: Analyzing
+mixed_read/text/1000    time:   [768.00 µs 771.55 µs 775.99 µs]
+                        thrpt:  [35.521 MiB/s 35.726 MiB/s 35.891 MiB/s]
+Found 11 outliers among 100 measurements (11.00%)
+  4 (4.00%) high mild
+  7 (7.00%) high severe
+Benchmarking mixed_read/scalar/1000
+Benchmarking mixed_read/scalar/1000: Warming up for 3.0000 s
+Benchmarking mixed_read/scalar/1000: Collecting 100 samples in estimated 5.0014 s (13k iterations)
+Benchmarking mixed_read/scalar/1000: Analyzing
+mixed_read/scalar/1000  time:   [385.40 µs 386.82 µs 388.39 µs]
+                        thrpt:  [102.89 MiB/s 103.31 MiB/s 103.69 MiB/s]
+Found 8 outliers among 100 measurements (8.00%)
+  3 (3.00%) high mild
+  5 (5.00%) high severe
+Benchmarking mixed_read/enum/1000
+Benchmarking mixed_read/enum/1000: Warming up for 3.0000 s
+Benchmarking mixed_read/enum/1000: Collecting 100 samples in estimated 5.0108 s (16k iterations)
+Benchmarking mixed_read/enum/1000: Analyzing
+mixed_read/enum/1000    time:   [321.78 µs 323.58 µs 325.73 µs]
+                        thrpt:  [58.594 MiB/s 58.984 MiB/s 59.313 MiB/s]
+Found 11 outliers among 100 measurements (11.00%)
+  7 (7.00%) high mild
+  4 (4.00%) high severe
+Benchmarking mixed_read/pattern/1000
+Benchmarking mixed_read/pattern/1000: Warming up for 3.0000 s
+Benchmarking mixed_read/pattern/1000: Collecting 100 samples in estimated 5.0352 s (12k iterations)
+Benchmarking mixed_read/pattern/1000: Analyzing
+mixed_read/pattern/1000 time:   [402.27 µs 405.33 µs 408.93 µs]
+                        thrpt:  [44.341 MiB/s 44.734 MiB/s 45.074 MiB/s]
+Found 14 outliers among 100 measurements (14.00%)
+  6 (6.00%) high mild
+  8 (8.00%) high severe
+Benchmarking mixed_read/nested/1000
+Benchmarking mixed_read/nested/1000: Warming up for 3.0000 s
+Benchmarking mixed_read/nested/1000: Collecting 100 samples in estimated 5.0250 s (8000 iterations)
+Benchmarking mixed_read/nested/1000: Analyzing
+mixed_read/nested/1000  time:   [621.34 µs 623.86 µs 626.76 µs]
+                        thrpt:  [57.673 MiB/s 57.941 MiB/s 58.176 MiB/s]
+Found 10 outliers among 100 measurements (10.00%)
+  2 (2.00%) high mild
+  8 (8.00%) high severe
+
+Benchmarking mixed_write/text/1000
+Benchmarking mixed_write/text/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/text/1000: Collecting 100 samples in estimated 5.0056 s (34k iterations)
+Benchmarking mixed_write/text/1000: Analyzing
+mixed_write/text/1000   time:   [143.98 µs 144.80 µs 145.77 µs]
+                        thrpt:  [189.09 MiB/s 190.36 MiB/s 191.44 MiB/s]
+Found 9 outliers among 100 measurements (9.00%)
+  4 (4.00%) high mild
+  5 (5.00%) high severe
+Benchmarking mixed_write/scalar/1000
+Benchmarking mixed_write/scalar/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/scalar/1000: Collecting 100 samples in estimated 5.0016 s (46k iterations)
+Benchmarking mixed_write/scalar/1000: Analyzing
+mixed_write/scalar/1000 time:   [108.46 µs 109.42 µs 110.60 µs]
+                        thrpt:  [361.32 MiB/s 365.22 MiB/s 368.45 MiB/s]
+Found 17 outliers among 100 measurements (17.00%)
+  4 (4.00%) high mild
+  13 (13.00%) high severe
+Benchmarking mixed_write/enum/1000
+Benchmarking mixed_write/enum/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/enum/1000: Collecting 100 samples in estimated 5.0058 s (62k iterations)
+Benchmarking mixed_write/enum/1000: Analyzing
+mixed_write/enum/1000   time:   [80.064 µs 80.582 µs 81.187 µs]
+                        thrpt:  [235.09 MiB/s 236.85 MiB/s 238.38 MiB/s]
+Found 12 outliers among 100 measurements (12.00%)
+  4 (4.00%) high mild
+  8 (8.00%) high severe
+Benchmarking mixed_write/pattern/1000
+Benchmarking mixed_write/pattern/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/pattern/1000: Collecting 100 samples in estimated 5.0041 s (30k iterations)
+Benchmarking mixed_write/pattern/1000: Analyzing
+mixed_write/pattern/1000
+                        time:   [165.21 µs 166.63 µs 168.38 µs]
+                        thrpt:  [107.69 MiB/s 108.82 MiB/s 109.75 MiB/s]
+Found 13 outliers among 100 measurements (13.00%)
+  2 (2.00%) high mild
+  11 (11.00%) high severe
+Benchmarking mixed_write/nested/1000
+Benchmarking mixed_write/nested/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/nested/1000: Collecting 100 samples in estimated 5.0004 s (51k iterations)
+Benchmarking mixed_write/nested/1000: Analyzing
+mixed_write/nested/1000 time:   [98.963 µs 99.585 µs 100.56 µs]
+                        thrpt:  [359.45 MiB/s 362.98 MiB/s 365.26 MiB/s]
+Found 8 outliers among 100 measurements (8.00%)
+  5 (5.00%) high mild
+  3 (3.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/current-2.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/current-2.txt
new file mode 100644
index 0000000..684b080
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/current-2.txt
@@ -0,0 +1,94 @@
+memcap: <=7744 MiB (60% of 12906 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_read/text/1000
+Benchmarking mixed_read/text/1000: Warming up for 3.0000 s
+Benchmarking mixed_read/text/1000: Collecting 100 samples in estimated 5.0108 s (6400 iterations)
+Benchmarking mixed_read/text/1000: Analyzing
+mixed_read/text/1000    time:   [779.04 µs 786.03 µs 793.94 µs]
+                        thrpt:  [34.718 MiB/s 35.067 MiB/s 35.382 MiB/s]
+Found 18 outliers among 100 measurements (18.00%)
+  7 (7.00%) high mild
+  11 (11.00%) high severe
+Benchmarking mixed_read/scalar/1000
+Benchmarking mixed_read/scalar/1000: Warming up for 3.0000 s
+Benchmarking mixed_read/scalar/1000: Collecting 100 samples in estimated 5.0320 s (13k iterations)
+Benchmarking mixed_read/scalar/1000: Analyzing
+mixed_read/scalar/1000  time:   [383.88 µs 385.44 µs 387.18 µs]
+                        thrpt:  [103.21 MiB/s 103.68 MiB/s 104.10 MiB/s]
+Found 11 outliers among 100 measurements (11.00%)
+  6 (6.00%) high mild
+  5 (5.00%) high severe
+Benchmarking mixed_read/enum/1000
+Benchmarking mixed_read/enum/1000: Warming up for 3.0000 s
+Benchmarking mixed_read/enum/1000: Collecting 100 samples in estimated 5.0188 s (16k iterations)
+Benchmarking mixed_read/enum/1000: Analyzing
+mixed_read/enum/1000    time:   [321.31 µs 324.89 µs 329.29 µs]
+                        thrpt:  [57.961 MiB/s 58.746 MiB/s 59.401 MiB/s]
+Found 17 outliers among 100 measurements (17.00%)
+  4 (4.00%) high mild
+  13 (13.00%) high severe
+Benchmarking mixed_read/pattern/1000
+Benchmarking mixed_read/pattern/1000: Warming up for 3.0000 s
+Benchmarking mixed_read/pattern/1000: Collecting 100 samples in estimated 5.0327 s (12k iterations)
+Benchmarking mixed_read/pattern/1000: Analyzing
+mixed_read/pattern/1000 time:   [401.23 µs 404.27 µs 408.05 µs]
+                        thrpt:  [44.436 MiB/s 44.852 MiB/s 45.191 MiB/s]
+Found 14 outliers among 100 measurements (14.00%)
+  5 (5.00%) high mild
+  9 (9.00%) high severe
+Benchmarking mixed_read/nested/1000
+Benchmarking mixed_read/nested/1000: Warming up for 3.0000 s
+Benchmarking mixed_read/nested/1000: Collecting 100 samples in estimated 5.0146 s (8000 iterations)
+Benchmarking mixed_read/nested/1000: Analyzing
+mixed_read/nested/1000  time:   [621.04 µs 627.82 µs 637.03 µs]
+                        thrpt:  [56.744 MiB/s 57.576 MiB/s 58.204 MiB/s]
+Found 14 outliers among 100 measurements (14.00%)
+  4 (4.00%) high mild
+  10 (10.00%) high severe
+
+Benchmarking mixed_write/text/1000
+Benchmarking mixed_write/text/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/text/1000: Collecting 100 samples in estimated 5.0058 s (35k iterations)
+Benchmarking mixed_write/text/1000: Analyzing
+mixed_write/text/1000   time:   [142.35 µs 143.58 µs 145.32 µs]
+                        thrpt:  [189.68 MiB/s 191.97 MiB/s 193.63 MiB/s]
+Found 12 outliers among 100 measurements (12.00%)
+  6 (6.00%) high mild
+  6 (6.00%) high severe
+Benchmarking mixed_write/scalar/1000
+Benchmarking mixed_write/scalar/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/scalar/1000: Collecting 100 samples in estimated 5.0038 s (49k iterations)
+Benchmarking mixed_write/scalar/1000: Analyzing
+mixed_write/scalar/1000 time:   [99.812 µs 101.29 µs 103.10 µs]
+                        thrpt:  [387.60 MiB/s 394.54 MiB/s 400.37 MiB/s]
+Found 13 outliers among 100 measurements (13.00%)
+  3 (3.00%) high mild
+  10 (10.00%) high severe
+Benchmarking mixed_write/enum/1000
+Benchmarking mixed_write/enum/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/enum/1000: Collecting 100 samples in estimated 5.0053 s (62k iterations)
+Benchmarking mixed_write/enum/1000: Analyzing
+mixed_write/enum/1000   time:   [80.425 µs 80.829 µs 81.301 µs]
+                        thrpt:  [234.76 MiB/s 236.13 MiB/s 237.31 MiB/s]
+Found 9 outliers among 100 measurements (9.00%)
+  3 (3.00%) high mild
+  6 (6.00%) high severe
+Benchmarking mixed_write/pattern/1000
+Benchmarking mixed_write/pattern/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/pattern/1000: Collecting 100 samples in estimated 5.0094 s (30k iterations)
+Benchmarking mixed_write/pattern/1000: Analyzing
+mixed_write/pattern/1000
+                        time:   [165.33 µs 166.24 µs 167.42 µs]
+                        thrpt:  [108.30 MiB/s 109.07 MiB/s 109.67 MiB/s]
+Found 9 outliers among 100 measurements (9.00%)
+  3 (3.00%) high mild
+  6 (6.00%) high severe
+Benchmarking mixed_write/nested/1000
+Benchmarking mixed_write/nested/1000: Warming up for 3.0000 s
+Benchmarking mixed_write/nested/1000: Collecting 100 samples in estimated 5.0002 s (51k iterations)
+Benchmarking mixed_write/nested/1000: Analyzing
+mixed_write/nested/1000 time:   [98.693 µs 99.638 µs 100.80 µs]
+                        thrpt:  [358.60 MiB/s 362.78 MiB/s 366.26 MiB/s]
+Found 13 outliers among 100 measurements (13.00%)
+  4 (4.00%) high mild
+  9 (9.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/current-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/current-build.txt
new file mode 100644
index 0000000..4c62aa4
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/current-build.txt
@@ -0,0 +1,3 @@
+memcap: <=7676 MiB (60% of 12794 MiB available) [systemd MemoryMax, swap off]
+   Compiling core-regression v0.0.0 (/home/bailey/github/polyxml-mixed-nil/benchmarks/rust-xml-regression/target/core-current)
+    Finished `bench` profile [optimized] target(s) in 2.81s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/current.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/current.lock
new file mode 100644
index 0000000..78a11b2
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/current.lock
@@ -0,0 +1,633 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "aho-corasick"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ae137229bcbd6cdf0f7b80a31df61766145077ddf49416a728b02cb3921ff3fc"
+dependencies = [
+ "windows-link",
+]
+
+[[package]]
+name = "zerocopy"
+version = "0.8.59"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6df92bf3d9227be3d53173901ddbffac2babc27ae50f397776ffd6dc33f800cb"
+dependencies = [
+ "zerocopy-derive",
+]
+
+[[package]]
+name = "zerocopy-derive"
+version = "0.8.59"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac4f328cf2f05d084e496c3e9c3f33ed0a183656a16e1fcec4d464d8373aec82"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.119",
+]
+
+[[package]]
+name = "zmij"
+version = "1.0.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "29666d0abbfad1e3dc4dcf6144730dd3a3ab225bbbdac83319345b1b44ccfc1b"
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/harness.rs b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/harness.rs
new file mode 100644
index 0000000..7d0413e
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/harness.rs
@@ -0,0 +1,120 @@
+use criterion::{
+    criterion_group, criterion_main, BenchmarkId, Criterion, SamplingMode, Throughput,
+};
+use polyxml::schema::ModelSchema;
+use polyxml::schema_parser::XsdParser;
+use polyxml::{deserialize, serialize, PolyValue};
+use std::{hint::black_box, sync::Arc};
+
+fn fixture(kind: &str, count: usize) -> (Arc<ModelSchema>, Vec<u8>) {
+    let xsd = r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
+      <xs:simpleType name="State"><xs:restriction base="xs:string"><xs:enumeration value="Ready"/><xs:enumeration value="Done"/></xs:restriction></xs:simpleType>
+      <xs:simpleType name="Code"><xs:restriction base="xs:string"><xs:pattern value="[A-Z]{3}[0-9]{3}"/></xs:restriction></xs:simpleType>
+      <xs:element name="Root"><xs:complexType mixed="true"><xs:choice minOccurs="0" maxOccurs="unbounded">
+        <xs:element name="Text" type="xs:string"/>
+        <xs:element name="Number" type="xs:int"/>
+        <xs:element name="State" type="State"/>
+        <xs:element name="Code" type="Code"/>
+        <xs:element name="Child"><xs:complexType><xs:sequence><xs:element name="Value" type="xs:string"/></xs:sequence></xs:complexType></xs:element>
+      </xs:choice></xs:complexType></xs:element>
+    </xs:schema>"#;
+    let ir = XsdParser::new().parse_str(xsd).unwrap();
+    let schema = ModelSchema::from_ir(&ir, Some("Root")).unwrap();
+    let mut xml = String::from("<Root>");
+    for index in 0..count {
+        let part = match kind {
+            "text" => format!("text-{index}&amp;<![CDATA[more]]>"),
+            "scalar" => format!("<Text>item-{index}&amp;<![CDATA[more]]></Text>"),
+            "enum" => "<State>Ready</State>".into(),
+            "pattern" => format!("<Code>ABC{:03}</Code>", index % 1000),
+            "nested" => format!("<Child><Value>item-{index}</Value></Child>"),
+            _ => unreachable!(),
+        };
+        xml.push_str(&part);
+    }
+    xml.push_str("</Root>");
+    let value = deserialize(xml.as_bytes(), Arc::clone(&schema)).unwrap();
+    let items_name = &schema.fields[schema.mixed_content.as_ref().unwrap().items_index].name;
+    let items = value.get(items_name).and_then(PolyValue::as_list).unwrap();
+    if kind == "text" {
+        // Text, GeneralRef and CData become separate ordered items.
+        assert_eq!(items.len(), count * 3);
+        for (index, items) in items.chunks_exact(3).enumerate() {
+            for (item, expected) in
+                items
+                    .iter()
+                    .zip([format!("text-{index}"), "&".into(), "more".into()])
+            {
+                assert_eq!(item.get("kind").and_then(PolyValue::as_str), Some("#text"));
+                assert_eq!(
+                    item.get("value").and_then(PolyValue::as_str),
+                    Some(expected.as_str())
+                );
+            }
+        }
+    } else {
+        assert_eq!(items.len(), count);
+        for (index, item) in items.iter().enumerate() {
+            let value = item.get("value").unwrap();
+            match kind {
+                "scalar" => assert_eq!(value.as_str(), Some(format!("item-{index}&more").as_str())),
+                "enum" => assert_eq!(value.as_str(), Some("Ready")),
+                "pattern" => assert_eq!(
+                    value.as_str(),
+                    Some(format!("ABC{:03}", index % 1000).as_str())
+                ),
+                "nested" => assert_eq!(
+                    value.get("value").and_then(PolyValue::as_str),
+                    Some(format!("item-{index}").as_str())
+                ),
+                _ => unreachable!(),
+            }
+        }
+    }
+    let output = serialize("Root", &value, &schema, None).unwrap();
+    let reparsed = deserialize(&output, Arc::clone(&schema)).unwrap();
+    if kind == "text" {
+        // XML writers coalesce adjacent text segments. Compare their text value
+        // rather than treating the reader's segmentation as XML semantics.
+        let text = |value: &PolyValue| -> String {
+            value
+                .get(items_name)
+                .unwrap()
+                .as_list()
+                .unwrap()
+                .iter()
+                .map(|item| item.get("value").unwrap().as_str().unwrap())
+                .collect()
+        };
+        assert_eq!(text(&value), text(&reparsed));
+    } else {
+        assert_eq!(value, reparsed);
+    }
+    (schema, xml.into_bytes())
+}
+
+fn benchmarks(c: &mut Criterion) {
+    for operation in ["mixed_read", "mixed_write"] {
+        let mut group = c.benchmark_group(operation);
+        group.sampling_mode(SamplingMode::Flat);
+        for kind in ["text", "scalar", "enum", "pattern", "nested"] {
+            let (schema, xml) = fixture(kind, 1000);
+            let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+            group.throughput(Throughput::Bytes(xml.len() as u64));
+            group.bench_function(BenchmarkId::new(kind, 1000), |b| {
+                if operation == "mixed_read" {
+                    b.iter(|| {
+                        black_box(deserialize(black_box(&xml), Arc::clone(&schema)).unwrap())
+                    });
+                } else {
+                    b.iter(|| {
+                        black_box(serialize("Root", black_box(&value), &schema, None).unwrap())
+                    });
+                }
+            });
+        }
+        group.finish();
+    }
+}
+criterion_group!(benches, benchmarks);
+criterion_main!(benches);
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/metadata.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/metadata.json
new file mode 100644
index 0000000..6d1433b
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/metadata.json
@@ -0,0 +1,19 @@
+{
+  "revisions": {
+    "baseline": "1819c91b0808b9242c642d82350d2b657b60108c",
+    "current": "f4ad13daf5a5fcfeb33481543dc75b3354be6ee3"
+  },
+  "core_status": {
+    "baseline": "",
+    "current": ""
+  },
+  "sample_size": 100,
+  "warmup_seconds": 3.0,
+  "measurement_seconds": 5.0,
+  "rounds": 3,
+  "filter": "",
+  "order": "alternate baseline/current per round",
+  "os": "Linux-6.18.40.1-microsoft-standard-WSL2-x86_64-with-glibc2.43",
+  "cpu": "11th Gen Intel(R) Core(TM) i5-11600K @ 3.90GHz",
+  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)\nbinary: rustc\ncommit-hash: b940084d7eb6a299eb4bfeb8e34901bc051e7ac4\ncommit-date: 2026-09-28\nhost: x86_64-unknown-linux-gnu\nrelease: 1.99.0\nLLVM version: 23.1.1\n"
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/summary.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/summary.json
new file mode 100644
index 0000000..fe50a6e
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-final/summary.json
@@ -0,0 +1,712 @@
+{
+  "mixed_read/enum/1000": {
+    "baseline_ns": 324559.37824675324,
+    "candidate_ns": 323577.7,
+    "delta_percent": -0.30246491475802717,
+    "speedup": 1.0030338254050055,
+    "process_deltas_percent": [
+      -0.6113358043077777,
+      -0.4347146927449308,
+      0.10209578121695984
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 322392.5766607142,
+            "upper_bound": 325547.790719156
+          },
+          "point_estimate": 323889.2021428571,
+          "standard_error": 806.9047497535354
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 323028.8242173202,
+            "upper_bound": 327470.702496732
+          },
+          "point_estimate": 324990.48137254897,
+          "standard_error": 1138.594787975065
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 323207.29843019467,
+            "upper_bound": 326054.8475990258
+          },
+          "point_estimate": 324559.37824675324,
+          "standard_error": 724.9356324472421
+        }
+      ],
+      "current": [
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+            "confidence_level": 0.95,
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+            "upper_bound": 324253.0582403227
+          },
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+          "standard_error": 1062.5485390873762
+        },
+        {
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+            "upper_bound": 325731.3048854838
+          },
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+        },
+        {
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+            "upper_bound": 329286.10287980776
+          },
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+        }
+      ]
+    }
+  },
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+          "standard_error": 224.8875885050209
+        }
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index 0000000..cd62479
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/baseline-build.txt
@@ -0,0 +1,37 @@
+memcap: <=7771 MiB (60% of 12952 MiB available) [systemd MemoryMax, swap off]
+   Compiling proc-macro2 v1.0.107
+   Compiling unicode-ident v1.0.26
+   Compiling quote v1.0.47
+   Compiling syn v3.0.6
+   Compiling serde_core v1.0.229
+   Compiling memchr v2.8.3
+   Compiling lexical-util v1.0.7
+   Compiling serde v1.0.229
+   Compiling serde_derive v1.0.229
+   Compiling siphasher v1.0.4
+   Compiling zmij v1.0.23
+   Compiling phf_shared v0.14.0
+   Compiling lexical-write-integer v1.0.6
+   Compiling lexical-parse-integer v1.0.6
+   Compiling aho-corasick v1.1.5
+   Compiling thiserror v2.0.21
+   Compiling regex-syntax v0.8.11
+   Compiling serde_json v1.0.151
+   Compiling fastrand v2.5.0
+   Compiling phf_generator v0.14.0
+   Compiling regex-automata v0.4.18
+   Compiling lexical-parse-float v1.0.6
+   Compiling lexical-write-float v1.0.6
+   Compiling thiserror-impl v2.0.21
+   Compiling itoa v1.0.18
+   Compiling memo-map v0.3.4
+   Compiling minijinja v2.24.0
+   Compiling lexical-core v1.0.6
+   Compiling regex v1.13.1
+   Compiling phf_codegen v0.14.0
+   Compiling quick-xml v0.42.0
+   Compiling heck v0.5.0
+   Compiling smallvec v1.16.2
+   Compiling polyxml v0.34.6 (/home/bailey/github/polyxml-perf-selected/crates/polyxml-core)
+   Compiling mixed-profile v0.0.0 (/home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/mixed-profile-baseline)
+    Finished `release` profile [optimized + debuginfo] target(s) in 1m 12s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/baseline-harness.rs b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/baseline-harness.rs
new file mode 100644
index 0000000..0642853
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/baseline-harness.rs
@@ -0,0 +1,103 @@
+use polyxml::schema::ModelSchema;
+use polyxml::schema_parser::XsdParser;
+use polyxml::{deserialize, serialize, PolyValue};
+use std::{hint::black_box,sync::Arc};
+fn fixture(kind: &str, count: usize) -> (Arc<ModelSchema>, Vec<u8>) {
+    let xsd = r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
+      <xs:simpleType name="State"><xs:restriction base="xs:string"><xs:enumeration value="Ready"/><xs:enumeration value="Done"/></xs:restriction></xs:simpleType>
+      <xs:simpleType name="Code"><xs:restriction base="xs:string"><xs:pattern value="[A-Z]{3}[0-9]{3}"/></xs:restriction></xs:simpleType>
+      <xs:element name="Root"><xs:complexType mixed="true"><xs:choice minOccurs="0" maxOccurs="unbounded">
+        <xs:element name="Text" type="xs:string"/>
+        <xs:element name="Number" type="xs:int"/>
+        <xs:element name="State" type="State"/>
+        <xs:element name="Code" type="Code"/>
+        <xs:element name="Child"><xs:complexType><xs:sequence><xs:element name="Value" type="xs:string"/></xs:sequence></xs:complexType></xs:element>
+      </xs:choice></xs:complexType></xs:element>
+    </xs:schema>"#;
+    let ir = XsdParser::new().parse_str(xsd).unwrap();
+    let schema = ModelSchema::from_ir(&ir, Some("Root")).unwrap();
+    let mut xml = String::from("<Root>");
+    for index in 0..count {
+        let part = match kind {
+            "text" => format!("text-{index}&amp;<![CDATA[more]]>"),
+            "scalar" => format!("<Text>item-{index}&amp;<![CDATA[more]]></Text>"),
+            "enum" => "<State>Ready</State>".into(),
+            "pattern" => format!("<Code>ABC{:03}</Code>", index % 1000),
+            "nested" => format!("<Child><Value>item-{index}</Value></Child>"),
+            _ => unreachable!(),
+        };
+        xml.push_str(&part);
+    }
+    xml.push_str("</Root>");
+    let value = deserialize(xml.as_bytes(), Arc::clone(&schema)).unwrap();
+    let items_name = &schema.fields[schema.mixed_content.as_ref().unwrap().items_index].name;
+    let items = value.get(items_name).and_then(PolyValue::as_list).unwrap();
+    if kind == "text" {
+        // Text, GeneralRef and CData become separate ordered items.
+        assert_eq!(items.len(), count * 3);
+        for (index, items) in items.chunks_exact(3).enumerate() {
+            for (item, expected) in
+                items
+                    .iter()
+                    .zip([format!("text-{index}"), "&".into(), "more".into()])
+            {
+                assert_eq!(item.get("kind").and_then(PolyValue::as_str), Some("#text"));
+                assert_eq!(
+                    item.get("value").and_then(PolyValue::as_str),
+                    Some(expected.as_str())
+                );
+            }
+        }
+    } else {
+        assert_eq!(items.len(), count);
+        for (index, item) in items.iter().enumerate() {
+            let value = item.get("value").unwrap();
+            match kind {
+                "scalar" => assert_eq!(value.as_str(), Some(format!("item-{index}&more").as_str())),
+                "enum" => assert_eq!(value.as_str(), Some("Ready")),
+                "pattern" => assert_eq!(
+                    value.as_str(),
+                    Some(format!("ABC{:03}", index % 1000).as_str())
+                ),
+                "nested" => assert_eq!(
+                    value.get("value").and_then(PolyValue::as_str),
+                    Some(format!("item-{index}").as_str())
+                ),
+                _ => unreachable!(),
+            }
+        }
+    }
+    let output = serialize("Root", &value, &schema, None).unwrap();
+    let reparsed = deserialize(&output, Arc::clone(&schema)).unwrap();
+    if kind == "text" {
+        // XML writers coalesce adjacent text segments. Compare their text value
+        // rather than treating the reader's segmentation as XML semantics.
+        let text = |value: &PolyValue| -> String {
+            value
+                .get(items_name)
+                .unwrap()
+                .as_list()
+                .unwrap()
+                .iter()
+                .map(|item| item.get("value").unwrap().as_str().unwrap())
+                .collect()
+        };
+        assert_eq!(text(&value), text(&reparsed));
+    } else {
+        assert_eq!(value, reparsed);
+    }
+    (schema, xml.into_bytes())
+}
+
+
+#[inline(never)]
+fn measured_region(schema: &ModelSchema, value: &PolyValue, count: usize) {
+ for _ in 0..count { black_box(serialize("Root", black_box(value), black_box(schema), None).unwrap()); }
+}
+fn main() {
+ let kind=std::env::args().nth(1).unwrap();
+ let (schema,xml)=fixture(&kind,1000);
+ let value=deserialize(&xml,Arc::clone(&schema)).unwrap();
+ for _ in 0..3 { black_box(serialize("Root", &value, &schema,None).unwrap()); }
+ measured_region(&schema,&value,25);
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/baseline-metadata.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/baseline-metadata.json
new file mode 100644
index 0000000..e05efd6
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/baseline-metadata.json
@@ -0,0 +1,11 @@
+{
+  "revision": "1819c91b0808b9242c642d82350d2b657b60108c",
+  "kind": [
+    "scalar",
+    "pattern"
+  ],
+  "items": 1000,
+  "operations": 25,
+  "warmup_operations": 3,
+  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)\nbinary: rustc\ncommit-hash: b940084d7eb6a299eb4bfeb8e34901bc051e7ac4\ncommit-date: 2026-09-28\nhost: x86_64-unknown-linux-gnu\nrelease: 1.99.0\nLLVM version: 23.1.1\n"
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/baseline-pattern-annotated.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/baseline-pattern-annotated.txt
new file mode 100644
index 0000000..2f6addf
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/baseline-pattern-annotated.txt
@@ -0,0 +1,26 @@
+--------------------------------------------------------------------------------
+Profile data file '/home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/evidence/mixed-nil-instructions/baseline-pattern.callgrind' (creator: callgrind-3.26.0)
+--------------------------------------------------------------------------------
+I1 cache: 
+D1 cache: 
+LL cache: 
+Timerange: Basic block 0 - 17553374
+Trigger: Program termination
+Profiled target:  /home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/mixed-profile-baseline/target/release/mixed-profile pattern (PID 501055, part 1)
+Events recorded:  Ir
+Events shown:     Ir
+Event sort order: Ir
+Thresholds:       95
+Include dirs:     
+User annotated:   
+Auto-annotation:  off
+
+--------------------------------------------------------------------------------
+Ir 
+--------------------------------------------------------------------------------
+.           PROGRAM TOTALS (calculated)
+
+--------------------------------------------------------------------------------
+Ir  file:function
+--------------------------------------------------------------------------------
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/baseline-pattern-valgrind.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/baseline-pattern-valgrind.txt
new file mode 100644
index 0000000..bb9d553
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/baseline-pattern-valgrind.txt
@@ -0,0 +1,12 @@
+==501055== Callgrind, a call-graph generating cache profiler
+==501055== Copyright (C) 2002-2017, and GNU GPL'd, by Josef Weidendorfer et al.
+==501055== Using Valgrind-3.26.0 and LibVEX; rerun with -h for copyright info
+==501055== Command: /home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/mixed-profile-baseline/target/release/mixed-profile pattern
+==501055== Parent PID: 500160
+==501055== 
+==501055== For interactive control, run 'callgrind_control -h'.
+==501055== 
+==501055== Events    : Ir
+==501055== Collected : 0
+==501055== 
+==501055== I   refs:      0
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/baseline-pattern.callgrind b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/baseline-pattern.callgrind
new file mode 100644
index 0000000..c986f58
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/baseline-pattern.callgrind
@@ -0,0 +1,21 @@
+# callgrind format
+version: 1
+creator: callgrind-3.26.0
+pid: 501055
+cmd:  /home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/mixed-profile-baseline/target/release/mixed-profile pattern
+part: 1
+
+
+desc: I1 cache: 
+desc: D1 cache: 
+desc: LL cache: 
+
+desc: Timerange: Basic block 0 - 17553374
+desc: Trigger: Program termination
+
+positions: line
+events: Ir
+summary: 0
+
+
+totals: 0
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/baseline-scalar-annotated.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/baseline-scalar-annotated.txt
new file mode 100644
index 0000000..b3006fa
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/baseline-scalar-annotated.txt
@@ -0,0 +1,26 @@
+--------------------------------------------------------------------------------
+Profile data file '/home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/evidence/mixed-nil-instructions/baseline-scalar.callgrind' (creator: callgrind-3.26.0)
+--------------------------------------------------------------------------------
+I1 cache: 
+D1 cache: 
+LL cache: 
+Timerange: Basic block 0 - 16072065
+Trigger: Program termination
+Profiled target:  /home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/mixed-profile-baseline/target/release/mixed-profile scalar (PID 501049, part 1)
+Events recorded:  Ir
+Events shown:     Ir
+Event sort order: Ir
+Thresholds:       95
+Include dirs:     
+User annotated:   
+Auto-annotation:  off
+
+--------------------------------------------------------------------------------
+Ir 
+--------------------------------------------------------------------------------
+.           PROGRAM TOTALS (calculated)
+
+--------------------------------------------------------------------------------
+Ir  file:function
+--------------------------------------------------------------------------------
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/baseline-scalar-valgrind.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/baseline-scalar-valgrind.txt
new file mode 100644
index 0000000..0dce19c
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/baseline-scalar-valgrind.txt
@@ -0,0 +1,12 @@
+==501049== Callgrind, a call-graph generating cache profiler
+==501049== Copyright (C) 2002-2017, and GNU GPL'd, by Josef Weidendorfer et al.
+==501049== Using Valgrind-3.26.0 and LibVEX; rerun with -h for copyright info
+==501049== Command: /home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/mixed-profile-baseline/target/release/mixed-profile scalar
+==501049== Parent PID: 500160
+==501049== 
+==501049== For interactive control, run 'callgrind_control -h'.
+==501049== 
+==501049== Events    : Ir
+==501049== Collected : 0
+==501049== 
+==501049== I   refs:      0
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/baseline-scalar.callgrind b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/baseline-scalar.callgrind
new file mode 100644
index 0000000..a8dcc2d
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/baseline-scalar.callgrind
@@ -0,0 +1,21 @@
+# callgrind format
+version: 1
+creator: callgrind-3.26.0
+pid: 501049
+cmd:  /home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/mixed-profile-baseline/target/release/mixed-profile scalar
+part: 1
+
+
+desc: I1 cache: 
+desc: D1 cache: 
+desc: LL cache: 
+
+desc: Timerange: Basic block 0 - 16072065
+desc: Trigger: Program termination
+
+positions: line
+events: Ir
+summary: 0
+
+
+totals: 0
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/current-Cargo.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/current-Cargo.lock
new file mode 100644
index 0000000..f270549
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/current-Cargo.lock
@@ -0,0 +1,317 @@
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+[[package]]
+name = "regex-syntax"
+version = "0.8.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d6f6ff9a378485b298a5286656da665ba74413d36db0979633275d2e708145d4"
+
+[[package]]
+name = "serde"
+version = "1.0.229"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4148590afebada386688f18773da617792bf2ef03ffc1e4cbd2b1d45b023e0ba"
+dependencies = [
+ "serde_core",
+ "serde_derive",
+]
+
+[[package]]
+name = "serde_core"
+version = "1.0.229"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "67dca2c9c51e58a4791a4b1ed58308b39c64224d349a935ab5039aa360942a48"
+dependencies = [
+ "serde_derive",
+]
+
+[[package]]
+name = "serde_derive"
+version = "1.0.229"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e7a5d71263a5a7d47b41f6b3f06ba276f10cc18b0931f1799f710578e2309348"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "serde_json"
+version = "1.0.151"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c841b55ecdae098c80dcae9cf767f6f8a0c2cdb3416bbef72181df4d0fe73f14"
+dependencies = [
+ "itoa",
+ "memchr",
+ "serde",
+ "serde_core",
+ "zmij",
+]
+
+[[package]]
+name = "siphasher"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "33f4fe9184a62d842c9ef383018f3306d8ba224fd9d836f56d7288308847c256"
+
+[[package]]
+name = "smallvec"
+version = "1.16.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f9395f0f0eee849a9b707b2f06bb92a6a422090e2123bb2ef8e87a0e61892a8e"
+
+[[package]]
+name = "syn"
+version = "3.0.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8593e8e72159ed2257d083c7a454a85cbf854f37a0966d8d483aff8c8a3ebcee"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "thiserror"
+version = "2.0.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "09e52cb86a36cede5cb101bf8908837b3e4c6e5e59fe7fd85c23fb56200d189e"
+dependencies = [
+ "thiserror-impl",
+]
+
+[[package]]
+name = "thiserror-impl"
+version = "2.0.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fe5197923287db20a58125f0bc85c062f7f2c892de97b18c356f9efb14b28524"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "unicode-ident"
+version = "1.0.26"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d245f478577f809a851594d02313b640fb437e0bb33866753cff937863096954"
+
+[[package]]
+name = "zmij"
+version = "1.0.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "29666d0abbfad1e3dc4dcf6144730dd3a3ab225bbbdac83319345b1b44ccfc1b"
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/current-Cargo.toml b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/current-Cargo.toml
new file mode 100644
index 0000000..df7bd50
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/current-Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name="mixed-profile"
+version="0.0.0"
+edition="2021"
+[workspace]
+[dependencies]
+polyxml={path="/home/bailey/github/polyxml-mixed-nil/crates/polyxml-core"}
+[profile.release]
+debug=1
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/current-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/current-build.txt
new file mode 100644
index 0000000..d1d0015
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/current-build.txt
@@ -0,0 +1,37 @@
+memcap: <=7725 MiB (60% of 12875 MiB available) [systemd MemoryMax, swap off]
+   Compiling proc-macro2 v1.0.107
+   Compiling unicode-ident v1.0.26
+   Compiling quote v1.0.47
+   Compiling syn v3.0.6
+   Compiling serde_core v1.0.229
+   Compiling lexical-util v1.0.7
+   Compiling memchr v2.8.3
+   Compiling serde v1.0.229
+   Compiling serde_derive v1.0.229
+   Compiling siphasher v1.0.4
+   Compiling zmij v1.0.23
+   Compiling phf_shared v0.14.0
+   Compiling aho-corasick v1.1.5
+   Compiling lexical-parse-integer v1.0.6
+   Compiling lexical-write-integer v1.0.6
+   Compiling serde_json v1.0.151
+   Compiling regex-syntax v0.8.11
+   Compiling thiserror v2.0.21
+   Compiling fastrand v2.5.0
+   Compiling phf_generator v0.14.0
+   Compiling regex-automata v0.4.18
+   Compiling lexical-write-float v1.0.6
+   Compiling lexical-parse-float v1.0.6
+   Compiling thiserror-impl v2.0.21
+   Compiling itoa v1.0.18
+   Compiling memo-map v0.3.4
+   Compiling minijinja v2.24.0
+   Compiling lexical-core v1.0.6
+   Compiling regex v1.13.1
+   Compiling phf_codegen v0.14.0
+   Compiling quick-xml v0.42.0
+   Compiling heck v0.5.0
+   Compiling smallvec v1.16.2
+   Compiling polyxml v0.34.6 (/home/bailey/github/polyxml-mixed-nil/crates/polyxml-core)
+   Compiling mixed-profile v0.0.0 (/home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/mixed-profile-current)
+    Finished `release` profile [optimized + debuginfo] target(s) in 1m 12s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/current-harness.rs b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/current-harness.rs
new file mode 100644
index 0000000..0642853
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/current-harness.rs
@@ -0,0 +1,103 @@
+use polyxml::schema::ModelSchema;
+use polyxml::schema_parser::XsdParser;
+use polyxml::{deserialize, serialize, PolyValue};
+use std::{hint::black_box,sync::Arc};
+fn fixture(kind: &str, count: usize) -> (Arc<ModelSchema>, Vec<u8>) {
+    let xsd = r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
+      <xs:simpleType name="State"><xs:restriction base="xs:string"><xs:enumeration value="Ready"/><xs:enumeration value="Done"/></xs:restriction></xs:simpleType>
+      <xs:simpleType name="Code"><xs:restriction base="xs:string"><xs:pattern value="[A-Z]{3}[0-9]{3}"/></xs:restriction></xs:simpleType>
+      <xs:element name="Root"><xs:complexType mixed="true"><xs:choice minOccurs="0" maxOccurs="unbounded">
+        <xs:element name="Text" type="xs:string"/>
+        <xs:element name="Number" type="xs:int"/>
+        <xs:element name="State" type="State"/>
+        <xs:element name="Code" type="Code"/>
+        <xs:element name="Child"><xs:complexType><xs:sequence><xs:element name="Value" type="xs:string"/></xs:sequence></xs:complexType></xs:element>
+      </xs:choice></xs:complexType></xs:element>
+    </xs:schema>"#;
+    let ir = XsdParser::new().parse_str(xsd).unwrap();
+    let schema = ModelSchema::from_ir(&ir, Some("Root")).unwrap();
+    let mut xml = String::from("<Root>");
+    for index in 0..count {
+        let part = match kind {
+            "text" => format!("text-{index}&amp;<![CDATA[more]]>"),
+            "scalar" => format!("<Text>item-{index}&amp;<![CDATA[more]]></Text>"),
+            "enum" => "<State>Ready</State>".into(),
+            "pattern" => format!("<Code>ABC{:03}</Code>", index % 1000),
+            "nested" => format!("<Child><Value>item-{index}</Value></Child>"),
+            _ => unreachable!(),
+        };
+        xml.push_str(&part);
+    }
+    xml.push_str("</Root>");
+    let value = deserialize(xml.as_bytes(), Arc::clone(&schema)).unwrap();
+    let items_name = &schema.fields[schema.mixed_content.as_ref().unwrap().items_index].name;
+    let items = value.get(items_name).and_then(PolyValue::as_list).unwrap();
+    if kind == "text" {
+        // Text, GeneralRef and CData become separate ordered items.
+        assert_eq!(items.len(), count * 3);
+        for (index, items) in items.chunks_exact(3).enumerate() {
+            for (item, expected) in
+                items
+                    .iter()
+                    .zip([format!("text-{index}"), "&".into(), "more".into()])
+            {
+                assert_eq!(item.get("kind").and_then(PolyValue::as_str), Some("#text"));
+                assert_eq!(
+                    item.get("value").and_then(PolyValue::as_str),
+                    Some(expected.as_str())
+                );
+            }
+        }
+    } else {
+        assert_eq!(items.len(), count);
+        for (index, item) in items.iter().enumerate() {
+            let value = item.get("value").unwrap();
+            match kind {
+                "scalar" => assert_eq!(value.as_str(), Some(format!("item-{index}&more").as_str())),
+                "enum" => assert_eq!(value.as_str(), Some("Ready")),
+                "pattern" => assert_eq!(
+                    value.as_str(),
+                    Some(format!("ABC{:03}", index % 1000).as_str())
+                ),
+                "nested" => assert_eq!(
+                    value.get("value").and_then(PolyValue::as_str),
+                    Some(format!("item-{index}").as_str())
+                ),
+                _ => unreachable!(),
+            }
+        }
+    }
+    let output = serialize("Root", &value, &schema, None).unwrap();
+    let reparsed = deserialize(&output, Arc::clone(&schema)).unwrap();
+    if kind == "text" {
+        // XML writers coalesce adjacent text segments. Compare their text value
+        // rather than treating the reader's segmentation as XML semantics.
+        let text = |value: &PolyValue| -> String {
+            value
+                .get(items_name)
+                .unwrap()
+                .as_list()
+                .unwrap()
+                .iter()
+                .map(|item| item.get("value").unwrap().as_str().unwrap())
+                .collect()
+        };
+        assert_eq!(text(&value), text(&reparsed));
+    } else {
+        assert_eq!(value, reparsed);
+    }
+    (schema, xml.into_bytes())
+}
+
+
+#[inline(never)]
+fn measured_region(schema: &ModelSchema, value: &PolyValue, count: usize) {
+ for _ in 0..count { black_box(serialize("Root", black_box(value), black_box(schema), None).unwrap()); }
+}
+fn main() {
+ let kind=std::env::args().nth(1).unwrap();
+ let (schema,xml)=fixture(&kind,1000);
+ let value=deserialize(&xml,Arc::clone(&schema)).unwrap();
+ for _ in 0..3 { black_box(serialize("Root", &value, &schema,None).unwrap()); }
+ measured_region(&schema,&value,25);
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/current-metadata.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/current-metadata.json
new file mode 100644
index 0000000..d9080ee
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/current-metadata.json
@@ -0,0 +1,11 @@
+{
+  "revision": "121ac4b888fd434060d13fc886835a2fd46d684c",
+  "kind": [
+    "scalar",
+    "pattern"
+  ],
+  "items": 1000,
+  "operations": 25,
+  "warmup_operations": 3,
+  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)\nbinary: rustc\ncommit-hash: b940084d7eb6a299eb4bfeb8e34901bc051e7ac4\ncommit-date: 2026-09-28\nhost: x86_64-unknown-linux-gnu\nrelease: 1.99.0\nLLVM version: 23.1.1\n"
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/current-pattern-annotated.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/current-pattern-annotated.txt
new file mode 100644
index 0000000..001c7b1
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/current-pattern-annotated.txt
@@ -0,0 +1,26 @@
+--------------------------------------------------------------------------------
+Profile data file '/home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/evidence/mixed-nil-instructions/current-pattern.callgrind' (creator: callgrind-3.26.0)
+--------------------------------------------------------------------------------
+I1 cache: 
+D1 cache: 
+LL cache: 
+Timerange: Basic block 0 - 17587694
+Trigger: Program termination
+Profiled target:  /home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/mixed-profile-current/target/release/mixed-profile pattern (PID 502009, part 1)
+Events recorded:  Ir
+Events shown:     Ir
+Event sort order: Ir
+Thresholds:       95
+Include dirs:     
+User annotated:   
+Auto-annotation:  off
+
+--------------------------------------------------------------------------------
+Ir 
+--------------------------------------------------------------------------------
+.           PROGRAM TOTALS (calculated)
+
+--------------------------------------------------------------------------------
+Ir  file:function
+--------------------------------------------------------------------------------
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/current-pattern-valgrind.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/current-pattern-valgrind.txt
new file mode 100644
index 0000000..b4875d6
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/current-pattern-valgrind.txt
@@ -0,0 +1,12 @@
+==502009== Callgrind, a call-graph generating cache profiler
+==502009== Copyright (C) 2002-2017, and GNU GPL'd, by Josef Weidendorfer et al.
+==502009== Using Valgrind-3.26.0 and LibVEX; rerun with -h for copyright info
+==502009== Command: /home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/mixed-profile-current/target/release/mixed-profile pattern
+==502009== Parent PID: 501061
+==502009== 
+==502009== For interactive control, run 'callgrind_control -h'.
+==502009== 
+==502009== Events    : Ir
+==502009== Collected : 0
+==502009== 
+==502009== I   refs:      0
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/current-pattern.callgrind b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/current-pattern.callgrind
new file mode 100644
index 0000000..be6a001
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/current-pattern.callgrind
@@ -0,0 +1,21 @@
+# callgrind format
+version: 1
+creator: callgrind-3.26.0
+pid: 502009
+cmd:  /home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/mixed-profile-current/target/release/mixed-profile pattern
+part: 1
+
+
+desc: I1 cache: 
+desc: D1 cache: 
+desc: LL cache: 
+
+desc: Timerange: Basic block 0 - 17587694
+desc: Trigger: Program termination
+
+positions: line
+events: Ir
+summary: 0
+
+
+totals: 0
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/current-scalar-annotated.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/current-scalar-annotated.txt
new file mode 100644
index 0000000..2092cf0
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/current-scalar-annotated.txt
@@ -0,0 +1,26 @@
+--------------------------------------------------------------------------------
+Profile data file '/home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/evidence/mixed-nil-instructions/current-scalar.callgrind' (creator: callgrind-3.26.0)
+--------------------------------------------------------------------------------
+I1 cache: 
+D1 cache: 
+LL cache: 
+Timerange: Basic block 0 - 15724753
+Trigger: Program termination
+Profiled target:  /home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/mixed-profile-current/target/release/mixed-profile scalar (PID 502001, part 1)
+Events recorded:  Ir
+Events shown:     Ir
+Event sort order: Ir
+Thresholds:       95
+Include dirs:     
+User annotated:   
+Auto-annotation:  off
+
+--------------------------------------------------------------------------------
+Ir 
+--------------------------------------------------------------------------------
+.           PROGRAM TOTALS (calculated)
+
+--------------------------------------------------------------------------------
+Ir  file:function
+--------------------------------------------------------------------------------
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/current-scalar-valgrind.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/current-scalar-valgrind.txt
new file mode 100644
index 0000000..300ebcd
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/current-scalar-valgrind.txt
@@ -0,0 +1,12 @@
+==502001== Callgrind, a call-graph generating cache profiler
+==502001== Copyright (C) 2002-2017, and GNU GPL'd, by Josef Weidendorfer et al.
+==502001== Using Valgrind-3.26.0 and LibVEX; rerun with -h for copyright info
+==502001== Command: /home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/mixed-profile-current/target/release/mixed-profile scalar
+==502001== Parent PID: 501061
+==502001== 
+==502001== For interactive control, run 'callgrind_control -h'.
+==502001== 
+==502001== Events    : Ir
+==502001== Collected : 0
+==502001== 
+==502001== I   refs:      0
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/current-scalar.callgrind b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/current-scalar.callgrind
new file mode 100644
index 0000000..3c5fc7d
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions-empty-profile/current-scalar.callgrind
@@ -0,0 +1,21 @@
+# callgrind format
+version: 1
+creator: callgrind-3.26.0
+pid: 502001
+cmd:  /home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/mixed-profile-current/target/release/mixed-profile scalar
+part: 1
+
+
+desc: I1 cache: 
+desc: D1 cache: 
+desc: LL cache: 
+
+desc: Timerange: Basic block 0 - 15724753
+desc: Trigger: Program termination
+
+positions: line
+events: Ir
+summary: 0
+
+
+totals: 0
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/baseline-Cargo.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/baseline-Cargo.lock
new file mode 100644
index 0000000..f270549
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/baseline-Cargo.lock
@@ -0,0 +1,317 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "aho-corasick"
+version = "1.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "memchr",
+]
+
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+name = "fastrand"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+
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+
+[[package]]
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+checksum = "8f42a60cbdf9a97f5d2305f08a87dc4e09308d1276d28c869c684d7777685682"
+
+[[package]]
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+checksum = "7d8d125a277f807e55a77304455eb7b1cb52f2b18c143b60e766c120bd64a594"
+dependencies = [
+ "lexical-parse-float",
+ "lexical-parse-integer",
+ "lexical-util",
+ "lexical-write-float",
+ "lexical-write-integer",
+]
+
+[[package]]
+name = "lexical-parse-float"
+version = "1.0.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "52a9f232fbd6f550bc0137dcb5f99ab674071ac2d690ac69704593cb4abbea56"
+dependencies = [
+ "lexical-parse-integer",
+ "lexical-util",
+]
+
+[[package]]
+name = "lexical-parse-integer"
+version = "1.0.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9a7a039f8fb9c19c996cd7b2fcce303c1b2874fe1aca544edc85c4a5f8489b34"
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+ "lexical-util",
+]
+
+[[package]]
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+
+[[package]]
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/baseline-Cargo.toml b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/baseline-Cargo.toml
new file mode 100644
index 0000000..e96d2b0
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/baseline-Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name="mixed-profile"
+version="0.0.0"
+edition="2021"
+[workspace]
+[dependencies]
+polyxml={path="/home/bailey/github/polyxml-perf-selected/crates/polyxml-core"}
+[profile.release]
+debug=1
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/baseline-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/baseline-build.txt
new file mode 100644
index 0000000..6ae50d2
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/baseline-build.txt
@@ -0,0 +1,3 @@
+memcap: <=7766 MiB (60% of 12943 MiB available) [systemd MemoryMax, swap off]
+   Compiling mixed-profile v0.0.0 (/home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/mixed-profile-baseline)
+    Finished `release` profile [optimized + debuginfo] target(s) in 1.04s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/baseline-harness.rs b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/baseline-harness.rs
new file mode 100644
index 0000000..4cfe143
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/baseline-harness.rs
@@ -0,0 +1,104 @@
+use polyxml::schema::ModelSchema;
+use polyxml::schema_parser::XsdParser;
+use polyxml::{deserialize, serialize, PolyValue};
+use std::{hint::black_box,sync::Arc};
+fn fixture(kind: &str, count: usize) -> (Arc<ModelSchema>, Vec<u8>) {
+    let xsd = r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
+      <xs:simpleType name="State"><xs:restriction base="xs:string"><xs:enumeration value="Ready"/><xs:enumeration value="Done"/></xs:restriction></xs:simpleType>
+      <xs:simpleType name="Code"><xs:restriction base="xs:string"><xs:pattern value="[A-Z]{3}[0-9]{3}"/></xs:restriction></xs:simpleType>
+      <xs:element name="Root"><xs:complexType mixed="true"><xs:choice minOccurs="0" maxOccurs="unbounded">
+        <xs:element name="Text" type="xs:string"/>
+        <xs:element name="Number" type="xs:int"/>
+        <xs:element name="State" type="State"/>
+        <xs:element name="Code" type="Code"/>
+        <xs:element name="Child"><xs:complexType><xs:sequence><xs:element name="Value" type="xs:string"/></xs:sequence></xs:complexType></xs:element>
+      </xs:choice></xs:complexType></xs:element>
+    </xs:schema>"#;
+    let ir = XsdParser::new().parse_str(xsd).unwrap();
+    let schema = ModelSchema::from_ir(&ir, Some("Root")).unwrap();
+    let mut xml = String::from("<Root>");
+    for index in 0..count {
+        let part = match kind {
+            "text" => format!("text-{index}&amp;<![CDATA[more]]>"),
+            "scalar" => format!("<Text>item-{index}&amp;<![CDATA[more]]></Text>"),
+            "enum" => "<State>Ready</State>".into(),
+            "pattern" => format!("<Code>ABC{:03}</Code>", index % 1000),
+            "nested" => format!("<Child><Value>item-{index}</Value></Child>"),
+            _ => unreachable!(),
+        };
+        xml.push_str(&part);
+    }
+    xml.push_str("</Root>");
+    let value = deserialize(xml.as_bytes(), Arc::clone(&schema)).unwrap();
+    let items_name = &schema.fields[schema.mixed_content.as_ref().unwrap().items_index].name;
+    let items = value.get(items_name).and_then(PolyValue::as_list).unwrap();
+    if kind == "text" {
+        // Text, GeneralRef and CData become separate ordered items.
+        assert_eq!(items.len(), count * 3);
+        for (index, items) in items.chunks_exact(3).enumerate() {
+            for (item, expected) in
+                items
+                    .iter()
+                    .zip([format!("text-{index}"), "&".into(), "more".into()])
+            {
+                assert_eq!(item.get("kind").and_then(PolyValue::as_str), Some("#text"));
+                assert_eq!(
+                    item.get("value").and_then(PolyValue::as_str),
+                    Some(expected.as_str())
+                );
+            }
+        }
+    } else {
+        assert_eq!(items.len(), count);
+        for (index, item) in items.iter().enumerate() {
+            let value = item.get("value").unwrap();
+            match kind {
+                "scalar" => assert_eq!(value.as_str(), Some(format!("item-{index}&more").as_str())),
+                "enum" => assert_eq!(value.as_str(), Some("Ready")),
+                "pattern" => assert_eq!(
+                    value.as_str(),
+                    Some(format!("ABC{:03}", index % 1000).as_str())
+                ),
+                "nested" => assert_eq!(
+                    value.get("value").and_then(PolyValue::as_str),
+                    Some(format!("item-{index}").as_str())
+                ),
+                _ => unreachable!(),
+            }
+        }
+    }
+    let output = serialize("Root", &value, &schema, None).unwrap();
+    let reparsed = deserialize(&output, Arc::clone(&schema)).unwrap();
+    if kind == "text" {
+        // XML writers coalesce adjacent text segments. Compare their text value
+        // rather than treating the reader's segmentation as XML semantics.
+        let text = |value: &PolyValue| -> String {
+            value
+                .get(items_name)
+                .unwrap()
+                .as_list()
+                .unwrap()
+                .iter()
+                .map(|item| item.get("value").unwrap().as_str().unwrap())
+                .collect()
+        };
+        assert_eq!(text(&value), text(&reparsed));
+    } else {
+        assert_eq!(value, reparsed);
+    }
+    (schema, xml.into_bytes())
+}
+
+
+#[inline(never)]
+#[no_mangle]
+fn measured_region(schema: &ModelSchema, value: &PolyValue, count: usize) {
+ for _ in 0..count { black_box(serialize("Root", black_box(value), black_box(schema), None).unwrap()); }
+}
+fn main() {
+ let kind=std::env::args().nth(1).unwrap();
+ let (schema,xml)=fixture(&kind,1000);
+ let value=deserialize(&xml,Arc::clone(&schema)).unwrap();
+ for _ in 0..3 { black_box(serialize("Root", &value, &schema,None).unwrap()); }
+ measured_region(&schema,&value,25);
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/baseline-metadata.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/baseline-metadata.json
new file mode 100644
index 0000000..e05efd6
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/baseline-metadata.json
@@ -0,0 +1,11 @@
+{
+  "revision": "1819c91b0808b9242c642d82350d2b657b60108c",
+  "kind": [
+    "scalar",
+    "pattern"
+  ],
+  "items": 1000,
+  "operations": 25,
+  "warmup_operations": 3,
+  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)\nbinary: rustc\ncommit-hash: b940084d7eb6a299eb4bfeb8e34901bc051e7ac4\ncommit-date: 2026-09-28\nhost: x86_64-unknown-linux-gnu\nrelease: 1.99.0\nLLVM version: 23.1.1\n"
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/baseline-pattern-annotated.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/baseline-pattern-annotated.txt
new file mode 100644
index 0000000..0f0b7b7
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/baseline-pattern-annotated.txt
@@ -0,0 +1,122 @@
+--------------------------------------------------------------------------------
+Profile data file '/home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/evidence/mixed-nil-instructions/baseline-pattern.callgrind' (creator: callgrind-3.26.0)
+--------------------------------------------------------------------------------
+I1 cache: 
+D1 cache: 
+LL cache: 
+Timerange: Basic block 0 - 17564422
+Trigger: Program termination
+Profiled target:  /home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/mixed-profile-baseline/target/release/mixed-profile pattern (PID 502772, part 1)
+Events recorded:  Ir
+Events shown:     Ir
+Event sort order: Ir
+Thresholds:       95
+Include dirs:     
+User annotated:   
+Auto-annotation:  off
+
+--------------------------------------------------------------------------------
+Ir                  
+--------------------------------------------------------------------------------
+61,500,849 (100.0%)  PROGRAM TOTALS
+
+--------------------------------------------------------------------------------
+Ir                  file:function
+--------------------------------------------------------------------------------
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+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/baseline-pattern-valgrind.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/baseline-pattern-valgrind.txt
new file mode 100644
index 0000000..bc3d386
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/baseline-pattern-valgrind.txt
@@ -0,0 +1,12 @@
+==502772== Callgrind, a call-graph generating cache profiler
+==502772== Copyright (C) 2002-2017, and GNU GPL'd, by Josef Weidendorfer et al.
+==502772== Using Valgrind-3.26.0 and LibVEX; rerun with -h for copyright info
+==502772== Command: /home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/mixed-profile-baseline/target/release/mixed-profile pattern
+==502772== Parent PID: 502705
+==502772== 
+==502772== For interactive control, run 'callgrind_control -h'.
+==502772== 
+==502772== Events    : Ir
+==502772== Collected : 61500849
+==502772== 
+==502772== I   refs:      61,500,849
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/baseline-pattern.callgrind b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/baseline-pattern.callgrind
new file mode 100644
index 0000000..6b945f6
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/baseline-pattern.callgrind
@@ -0,0 +1,2041 @@
+# callgrind format
+version: 1
+creator: callgrind-3.26.0
+pid: 502772
+cmd:  /home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/mixed-profile-baseline/target/release/mixed-profile pattern
+part: 1
+
+
+desc: I1 cache: 
+desc: D1 cache: 
+desc: LL cache: 
+
+desc: Timerange: Basic block 0 - 17564422
+desc: Trigger: Program termination
+
+positions: line
+events: Ir
+summary: 61500849
+
+
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+fn=(4878) free
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+fn=(4162)
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+cfi=(6) ???
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+ob=(6)
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+fl=(215) /home/bailey/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/quick-xml-0.42.0/src/writer.rs
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/baseline-scalar-annotated.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/baseline-scalar-annotated.txt
new file mode 100644
index 0000000..dba746c
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/baseline-scalar-annotated.txt
@@ -0,0 +1,81 @@
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+Thresholds:       95
+Include dirs:     
+User annotated:   
+Auto-annotation:  off
+
+--------------------------------------------------------------------------------
+Ir                  
+--------------------------------------------------------------------------------
+51,672,474 (100.0%)  PROGRAM TOTALS
+
+--------------------------------------------------------------------------------
+Ir                  file:function
+--------------------------------------------------------------------------------
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+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/baseline-scalar-valgrind.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/baseline-scalar-valgrind.txt
new file mode 100644
index 0000000..d644f55
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/baseline-scalar-valgrind.txt
@@ -0,0 +1,12 @@
+==502766== Callgrind, a call-graph generating cache profiler
+==502766== Copyright (C) 2002-2017, and GNU GPL'd, by Josef Weidendorfer et al.
+==502766== Using Valgrind-3.26.0 and LibVEX; rerun with -h for copyright info
+==502766== Command: /home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/mixed-profile-baseline/target/release/mixed-profile scalar
+==502766== Parent PID: 502705
+==502766== 
+==502766== For interactive control, run 'callgrind_control -h'.
+==502766== 
+==502766== Events    : Ir
+==502766== Collected : 51672474
+==502766== 
+==502766== I   refs:      51,672,474
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/baseline-scalar.callgrind b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/baseline-scalar.callgrind
new file mode 100644
index 0000000..9affa0c
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/baseline-scalar.callgrind
@@ -0,0 +1,1500 @@
+# callgrind format
+version: 1
+creator: callgrind-3.26.0
+pid: 502766
+cmd:  /home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/mixed-profile-baseline/target/release/mixed-profile scalar
+part: 1
+
+
+desc: I1 cache: 
+desc: D1 cache: 
+desc: LL cache: 
+
+desc: Timerange: Basic block 0 - 16065486
+desc: Trigger: Program termination
+
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+summary: 51672474
+
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new file mode 100644
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/current-Cargo.toml b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/current-Cargo.toml
new file mode 100644
index 0000000..df7bd50
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/current-Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name="mixed-profile"
+version="0.0.0"
+edition="2021"
+[workspace]
+[dependencies]
+polyxml={path="/home/bailey/github/polyxml-mixed-nil/crates/polyxml-core"}
+[profile.release]
+debug=1
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/current-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/current-build.txt
new file mode 100644
index 0000000..7e7dfcd
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/current-build.txt
@@ -0,0 +1,3 @@
+memcap: <=7713 MiB (60% of 12855 MiB available) [systemd MemoryMax, swap off]
+   Compiling mixed-profile v0.0.0 (/home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/mixed-profile-current)
+    Finished `release` profile [optimized + debuginfo] target(s) in 1.02s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/current-harness.rs b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/current-harness.rs
new file mode 100644
index 0000000..4cfe143
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/current-harness.rs
@@ -0,0 +1,104 @@
+use polyxml::schema::ModelSchema;
+use polyxml::schema_parser::XsdParser;
+use polyxml::{deserialize, serialize, PolyValue};
+use std::{hint::black_box,sync::Arc};
+fn fixture(kind: &str, count: usize) -> (Arc<ModelSchema>, Vec<u8>) {
+    let xsd = r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
+      <xs:simpleType name="State"><xs:restriction base="xs:string"><xs:enumeration value="Ready"/><xs:enumeration value="Done"/></xs:restriction></xs:simpleType>
+      <xs:simpleType name="Code"><xs:restriction base="xs:string"><xs:pattern value="[A-Z]{3}[0-9]{3}"/></xs:restriction></xs:simpleType>
+      <xs:element name="Root"><xs:complexType mixed="true"><xs:choice minOccurs="0" maxOccurs="unbounded">
+        <xs:element name="Text" type="xs:string"/>
+        <xs:element name="Number" type="xs:int"/>
+        <xs:element name="State" type="State"/>
+        <xs:element name="Code" type="Code"/>
+        <xs:element name="Child"><xs:complexType><xs:sequence><xs:element name="Value" type="xs:string"/></xs:sequence></xs:complexType></xs:element>
+      </xs:choice></xs:complexType></xs:element>
+    </xs:schema>"#;
+    let ir = XsdParser::new().parse_str(xsd).unwrap();
+    let schema = ModelSchema::from_ir(&ir, Some("Root")).unwrap();
+    let mut xml = String::from("<Root>");
+    for index in 0..count {
+        let part = match kind {
+            "text" => format!("text-{index}&amp;<![CDATA[more]]>"),
+            "scalar" => format!("<Text>item-{index}&amp;<![CDATA[more]]></Text>"),
+            "enum" => "<State>Ready</State>".into(),
+            "pattern" => format!("<Code>ABC{:03}</Code>", index % 1000),
+            "nested" => format!("<Child><Value>item-{index}</Value></Child>"),
+            _ => unreachable!(),
+        };
+        xml.push_str(&part);
+    }
+    xml.push_str("</Root>");
+    let value = deserialize(xml.as_bytes(), Arc::clone(&schema)).unwrap();
+    let items_name = &schema.fields[schema.mixed_content.as_ref().unwrap().items_index].name;
+    let items = value.get(items_name).and_then(PolyValue::as_list).unwrap();
+    if kind == "text" {
+        // Text, GeneralRef and CData become separate ordered items.
+        assert_eq!(items.len(), count * 3);
+        for (index, items) in items.chunks_exact(3).enumerate() {
+            for (item, expected) in
+                items
+                    .iter()
+                    .zip([format!("text-{index}"), "&".into(), "more".into()])
+            {
+                assert_eq!(item.get("kind").and_then(PolyValue::as_str), Some("#text"));
+                assert_eq!(
+                    item.get("value").and_then(PolyValue::as_str),
+                    Some(expected.as_str())
+                );
+            }
+        }
+    } else {
+        assert_eq!(items.len(), count);
+        for (index, item) in items.iter().enumerate() {
+            let value = item.get("value").unwrap();
+            match kind {
+                "scalar" => assert_eq!(value.as_str(), Some(format!("item-{index}&more").as_str())),
+                "enum" => assert_eq!(value.as_str(), Some("Ready")),
+                "pattern" => assert_eq!(
+                    value.as_str(),
+                    Some(format!("ABC{:03}", index % 1000).as_str())
+                ),
+                "nested" => assert_eq!(
+                    value.get("value").and_then(PolyValue::as_str),
+                    Some(format!("item-{index}").as_str())
+                ),
+                _ => unreachable!(),
+            }
+        }
+    }
+    let output = serialize("Root", &value, &schema, None).unwrap();
+    let reparsed = deserialize(&output, Arc::clone(&schema)).unwrap();
+    if kind == "text" {
+        // XML writers coalesce adjacent text segments. Compare their text value
+        // rather than treating the reader's segmentation as XML semantics.
+        let text = |value: &PolyValue| -> String {
+            value
+                .get(items_name)
+                .unwrap()
+                .as_list()
+                .unwrap()
+                .iter()
+                .map(|item| item.get("value").unwrap().as_str().unwrap())
+                .collect()
+        };
+        assert_eq!(text(&value), text(&reparsed));
+    } else {
+        assert_eq!(value, reparsed);
+    }
+    (schema, xml.into_bytes())
+}
+
+
+#[inline(never)]
+#[no_mangle]
+fn measured_region(schema: &ModelSchema, value: &PolyValue, count: usize) {
+ for _ in 0..count { black_box(serialize("Root", black_box(value), black_box(schema), None).unwrap()); }
+}
+fn main() {
+ let kind=std::env::args().nth(1).unwrap();
+ let (schema,xml)=fixture(&kind,1000);
+ let value=deserialize(&xml,Arc::clone(&schema)).unwrap();
+ for _ in 0..3 { black_box(serialize("Root", &value, &schema,None).unwrap()); }
+ measured_region(&schema,&value,25);
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/current-metadata.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/current-metadata.json
new file mode 100644
index 0000000..d9080ee
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/current-metadata.json
@@ -0,0 +1,11 @@
+{
+  "revision": "121ac4b888fd434060d13fc886835a2fd46d684c",
+  "kind": [
+    "scalar",
+    "pattern"
+  ],
+  "items": 1000,
+  "operations": 25,
+  "warmup_operations": 3,
+  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)\nbinary: rustc\ncommit-hash: b940084d7eb6a299eb4bfeb8e34901bc051e7ac4\ncommit-date: 2026-09-28\nhost: x86_64-unknown-linux-gnu\nrelease: 1.99.0\nLLVM version: 23.1.1\n"
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/current-pattern-annotated.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/current-pattern-annotated.txt
new file mode 100644
index 0000000..285309c
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/current-pattern-annotated.txt
@@ -0,0 +1,122 @@
+--------------------------------------------------------------------------------
+Profile data file '/home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/evidence/mixed-nil-instructions/current-pattern.callgrind' (creator: callgrind-3.26.0)
+--------------------------------------------------------------------------------
+I1 cache: 
+D1 cache: 
+LL cache: 
+Timerange: Basic block 0 - 17596482
+Trigger: Program termination
+Profiled target:  /home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/mixed-profile-current/target/release/mixed-profile pattern (PID 502846, part 1)
+Events recorded:  Ir
+Events shown:     Ir
+Event sort order: Ir
+Thresholds:       95
+Include dirs:     
+User annotated:   
+Auto-annotation:  off
+
+--------------------------------------------------------------------------------
+Ir                  
+--------------------------------------------------------------------------------
+61,654,974 (100.0%)  PROGRAM TOTALS
+
+--------------------------------------------------------------------------------
+Ir                  file:function
+--------------------------------------------------------------------------------
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+  100,000 ( 0.16%)  /rustc/b940084d7eb6a299eb4bfeb8e34901bc051e7ac4/library/alloc/src/raw_vec/mod.rs:core::ptr::drop_glue::<polyxml::value::PolyValue>
+  100,000 ( 0.16%)  /rustc/b940084d7eb6a299eb4bfeb8e34901bc051e7ac4/library/alloc/src/vec/mod.rs:<polyxml::converters::ValueConverter>::parse_scalar
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+  100,000 ( 0.16%)  /rustc/b940084d7eb6a299eb4bfeb8e34901bc051e7ac4/library/core/src/ptr/mod.rs:<polyxml::converters::ValueConverter>::parse_scalar'2
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+  100,000 ( 0.16%)  /rustc/b940084d7eb6a299eb4bfeb8e34901bc051e7ac4/library/core/src/result.rs:<polyxml::converters::ValueConverter>::parse_scalar'2
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/current-pattern-valgrind.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/current-pattern-valgrind.txt
new file mode 100644
index 0000000..7f16cec
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/current-pattern-valgrind.txt
@@ -0,0 +1,12 @@
+==502846== Callgrind, a call-graph generating cache profiler
+==502846== Copyright (C) 2002-2017, and GNU GPL'd, by Josef Weidendorfer et al.
+==502846== Using Valgrind-3.26.0 and LibVEX; rerun with -h for copyright info
+==502846== Command: /home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/mixed-profile-current/target/release/mixed-profile pattern
+==502846== Parent PID: 502780
+==502846== 
+==502846== For interactive control, run 'callgrind_control -h'.
+==502846== 
+==502846== Events    : Ir
+==502846== Collected : 61654974
+==502846== 
+==502846== I   refs:      61,654,974
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/current-pattern.callgrind b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/current-pattern.callgrind
new file mode 100644
index 0000000..c3c395b
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/current-pattern.callgrind
@@ -0,0 +1,2041 @@
+# callgrind format
+version: 1
+creator: callgrind-3.26.0
+pid: 502846
+cmd:  /home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/mixed-profile-current/target/release/mixed-profile pattern
+part: 1
+
+
+desc: I1 cache: 
+desc: D1 cache: 
+desc: LL cache: 
+
+desc: Timerange: Basic block 0 - 17596482
+desc: Trigger: Program termination
+
+positions: line
+events: Ir
+summary: 61654974
+
+
+ob=(2) /usr/lib/x86_64-linux-gnu/libc.so.6
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+
+totals: 61654974
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/current-scalar-annotated.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/current-scalar-annotated.txt
new file mode 100644
index 0000000..4235f14
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/current-scalar-annotated.txt
@@ -0,0 +1,81 @@
+--------------------------------------------------------------------------------
+Profile data file '/home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/evidence/mixed-nil-instructions/current-scalar.callgrind' (creator: callgrind-3.26.0)
+--------------------------------------------------------------------------------
+I1 cache: 
+D1 cache: 
+LL cache: 
+Timerange: Basic block 0 - 15715390
+Trigger: Program termination
+Profiled target:  /home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/mixed-profile-current/target/release/mixed-profile scalar (PID 502838, part 1)
+Events recorded:  Ir
+Events shown:     Ir
+Event sort order: Ir
+Thresholds:       95
+Include dirs:     
+User annotated:   
+Auto-annotation:  off
+
+--------------------------------------------------------------------------------
+Ir                  
+--------------------------------------------------------------------------------
+50,340,299 (100.0%)  PROGRAM TOTALS
+
+--------------------------------------------------------------------------------
+Ir                  file:function
+--------------------------------------------------------------------------------
+4,517,225 ( 8.97%)  ???:0x00000000000b20e0 [/usr/lib/x86_64-linux-gnu/libc.so.6]
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+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/current-scalar-valgrind.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/current-scalar-valgrind.txt
new file mode 100644
index 0000000..d32b52e
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/current-scalar-valgrind.txt
@@ -0,0 +1,12 @@
+==502838== Callgrind, a call-graph generating cache profiler
+==502838== Copyright (C) 2002-2017, and GNU GPL'd, by Josef Weidendorfer et al.
+==502838== Using Valgrind-3.26.0 and LibVEX; rerun with -h for copyright info
+==502838== Command: /home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/mixed-profile-current/target/release/mixed-profile scalar
+==502838== Parent PID: 502780
+==502838== 
+==502838== For interactive control, run 'callgrind_control -h'.
+==502838== 
+==502838== Events    : Ir
+==502838== Collected : 50340299
+==502838== 
+==502838== I   refs:      50,340,299
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/current-scalar.callgrind b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/current-scalar.callgrind
new file mode 100644
index 0000000..5abfd5e
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-instructions/current-scalar.callgrind
@@ -0,0 +1,1500 @@
+# callgrind format
+version: 1
+creator: callgrind-3.26.0
+pid: 502838
+cmd:  /home/bailey/github/PolyXML/benchmarks/rust-runtime-investigation/target/mixed-profile-current/target/release/mixed-profile scalar
+part: 1
+
+
+desc: I1 cache: 
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-screen/baseline-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-screen/baseline-0.txt
new file mode 100644
index 0000000..792692b
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-screen/baseline-0.txt
@@ -0,0 +1,93 @@
+memcap: <=7728 MiB (60% of 12880 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_read/text/1000
+Benchmarking mixed_read/text/1000: Warming up for 1.0000 s
+Benchmarking mixed_read/text/1000: Collecting 50 samples in estimated 2.0182 s (2800 iterations)
+Benchmarking mixed_read/text/1000: Analyzing
+mixed_read/text/1000    time:   [716.46 µs 720.10 µs 724.23 µs]
+                        thrpt:  [38.060 MiB/s 38.278 MiB/s 38.472 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  3 (6.00%) high mild
+  2 (4.00%) high severe
+Benchmarking mixed_read/scalar/1000
+Benchmarking mixed_read/scalar/1000: Warming up for 1.0000 s
+Benchmarking mixed_read/scalar/1000: Collecting 50 samples in estimated 2.0165 s (5100 iterations)
+Benchmarking mixed_read/scalar/1000: Analyzing
+mixed_read/scalar/1000  time:   [391.70 µs 396.29 µs 401.43 µs]
+                        thrpt:  [99.549 MiB/s 100.84 MiB/s 102.02 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  3 (6.00%) high mild
+  4 (8.00%) high severe
+Benchmarking mixed_read/enum/1000
+Benchmarking mixed_read/enum/1000: Warming up for 1.0000 s
+Benchmarking mixed_read/enum/1000: Collecting 50 samples in estimated 2.0086 s (6200 iterations)
+Benchmarking mixed_read/enum/1000: Analyzing
+mixed_read/enum/1000    time:   [320.82 µs 322.58 µs 324.73 µs]
+                        thrpt:  [58.775 MiB/s 59.167 MiB/s 59.491 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  1 (2.00%) high mild
+  4 (8.00%) high severe
+Benchmarking mixed_read/pattern/1000
+Benchmarking mixed_read/pattern/1000: Warming up for 1.0000 s
+Benchmarking mixed_read/pattern/1000: Collecting 50 samples in estimated 2.0036 s (4900 iterations)
+Benchmarking mixed_read/pattern/1000: Analyzing
+mixed_read/pattern/1000 time:   [404.01 µs 408.17 µs 413.51 µs]
+                        thrpt:  [43.850 MiB/s 44.423 MiB/s 44.881 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  3 (6.00%) high mild
+  3 (6.00%) high severe
+Benchmarking mixed_read/nested/1000
+Benchmarking mixed_read/nested/1000: Warming up for 1.0000 s
+Benchmarking mixed_read/nested/1000: Collecting 50 samples in estimated 2.0104 s (3200 iterations)
+Benchmarking mixed_read/nested/1000: Analyzing
+mixed_read/nested/1000  time:   [625.21 µs 630.25 µs 636.19 µs]
+                        thrpt:  [56.818 MiB/s 57.354 MiB/s 57.816 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  1 (2.00%) high mild
+  6 (12.00%) high severe
+
+Benchmarking mixed_write/text/1000
+Benchmarking mixed_write/text/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/text/1000: Collecting 50 samples in estimated 2.0044 s (14k iterations)
+Benchmarking mixed_write/text/1000: Analyzing
+mixed_write/text/1000   time:   [145.41 µs 146.06 µs 146.80 µs]
+                        thrpt:  [187.76 MiB/s 188.72 MiB/s 189.56 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  2 (4.00%) high mild
+  1 (2.00%) high severe
+Benchmarking mixed_write/scalar/1000
+Benchmarking mixed_write/scalar/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/scalar/1000: Collecting 50 samples in estimated 2.0001 s (18k iterations)
+Benchmarking mixed_write/scalar/1000: Analyzing
+mixed_write/scalar/1000 time:   [111.10 µs 111.87 µs 112.82 µs]
+                        thrpt:  [354.20 MiB/s 357.23 MiB/s 359.70 MiB/s]
+Found 2 outliers among 50 measurements (4.00%)
+  2 (4.00%) high severe
+Benchmarking mixed_write/enum/1000
+Benchmarking mixed_write/enum/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/enum/1000: Collecting 50 samples in estimated 2.0040 s (25k iterations)
+Benchmarking mixed_write/enum/1000: Analyzing
+mixed_write/enum/1000   time:   [79.632 µs 80.086 µs 80.639 µs]
+                        thrpt:  [236.68 MiB/s 238.32 MiB/s 239.68 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  2 (4.00%) high mild
+  5 (10.00%) high severe
+Benchmarking mixed_write/pattern/1000
+Benchmarking mixed_write/pattern/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/pattern/1000: Collecting 50 samples in estimated 2.0008 s (13k iterations)
+Benchmarking mixed_write/pattern/1000: Analyzing
+mixed_write/pattern/1000
+                        time:   [144.18 µs 144.94 µs 145.90 µs]
+                        thrpt:  [124.28 MiB/s 125.10 MiB/s 125.76 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  1 (2.00%) high mild
+  4 (8.00%) high severe
+Benchmarking mixed_write/nested/1000
+Benchmarking mixed_write/nested/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/nested/1000: Collecting 50 samples in estimated 2.0046 s (20k iterations)
+Benchmarking mixed_write/nested/1000: Analyzing
+mixed_write/nested/1000 time:   [98.154 µs 98.777 µs 99.555 µs]
+                        thrpt:  [363.09 MiB/s 365.95 MiB/s 368.27 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  3 (6.00%) high mild
+  3 (6.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-screen/baseline-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-screen/baseline-1.txt
new file mode 100644
index 0000000..756f2a8
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-screen/baseline-1.txt
@@ -0,0 +1,93 @@
+memcap: <=7777 MiB (60% of 12962 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_read/text/1000
+Benchmarking mixed_read/text/1000: Warming up for 1.0000 s
+Benchmarking mixed_read/text/1000: Collecting 50 samples in estimated 2.0155 s (2550 iterations)
+Benchmarking mixed_read/text/1000: Analyzing
+mixed_read/text/1000    time:   [772.06 µs 776.52 µs 782.03 µs]
+                        thrpt:  [35.247 MiB/s 35.497 MiB/s 35.702 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  3 (6.00%) high mild
+  3 (6.00%) high severe
+Benchmarking mixed_read/scalar/1000
+Benchmarking mixed_read/scalar/1000: Warming up for 1.0000 s
+Benchmarking mixed_read/scalar/1000: Collecting 50 samples in estimated 2.0132 s (5150 iterations)
+Benchmarking mixed_read/scalar/1000: Analyzing
+mixed_read/scalar/1000  time:   [388.13 µs 390.17 µs 392.82 µs]
+                        thrpt:  [101.73 MiB/s 102.42 MiB/s 102.96 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  2 (4.00%) high mild
+  3 (6.00%) high severe
+Benchmarking mixed_read/enum/1000
+Benchmarking mixed_read/enum/1000: Warming up for 1.0000 s
+Benchmarking mixed_read/enum/1000: Collecting 50 samples in estimated 2.0099 s (6150 iterations)
+Benchmarking mixed_read/enum/1000: Analyzing
+mixed_read/enum/1000    time:   [321.68 µs 323.86 µs 326.44 µs]
+                        thrpt:  [58.467 MiB/s 58.932 MiB/s 59.333 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  4 (8.00%) high mild
+  3 (6.00%) high severe
+Benchmarking mixed_read/pattern/1000
+Benchmarking mixed_read/pattern/1000: Warming up for 1.0000 s
+Benchmarking mixed_read/pattern/1000: Collecting 50 samples in estimated 2.0059 s (4950 iterations)
+Benchmarking mixed_read/pattern/1000: Analyzing
+mixed_read/pattern/1000 time:   [403.13 µs 408.99 µs 416.92 µs]
+                        thrpt:  [43.491 MiB/s 44.334 MiB/s 44.979 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  3 (6.00%) high severe
+Benchmarking mixed_read/nested/1000
+Benchmarking mixed_read/nested/1000: Warming up for 1.0000 s
+Benchmarking mixed_read/nested/1000: Collecting 50 samples in estimated 2.0103 s (3200 iterations)
+Benchmarking mixed_read/nested/1000: Analyzing
+mixed_read/nested/1000  time:   [621.71 µs 625.20 µs 629.27 µs]
+                        thrpt:  [57.443 MiB/s 57.817 MiB/s 58.142 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  1 (2.00%) high mild
+  3 (6.00%) high severe
+
+Benchmarking mixed_write/text/1000
+Benchmarking mixed_write/text/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/text/1000: Collecting 50 samples in estimated 2.0039 s (13k iterations)
+Benchmarking mixed_write/text/1000: Analyzing
+mixed_write/text/1000   time:   [144.59 µs 145.48 µs 146.53 µs]
+                        thrpt:  [188.11 MiB/s 189.47 MiB/s 190.64 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  2 (4.00%) high mild
+  3 (6.00%) high severe
+Benchmarking mixed_write/scalar/1000
+Benchmarking mixed_write/scalar/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/scalar/1000: Collecting 50 samples in estimated 2.0035 s (18k iterations)
+Benchmarking mixed_write/scalar/1000: Analyzing
+mixed_write/scalar/1000 time:   [110.47 µs 111.43 µs 112.59 µs]
+                        thrpt:  [354.93 MiB/s 358.63 MiB/s 361.74 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  2 (4.00%) high mild
+  5 (10.00%) high severe
+Benchmarking mixed_write/enum/1000
+Benchmarking mixed_write/enum/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/enum/1000: Collecting 50 samples in estimated 2.0039 s (25k iterations)
+Benchmarking mixed_write/enum/1000: Analyzing
+mixed_write/enum/1000   time:   [79.530 µs 79.922 µs 80.411 µs]
+                        thrpt:  [237.35 MiB/s 238.81 MiB/s 239.98 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  1 (2.00%) high mild
+  3 (6.00%) high severe
+Benchmarking mixed_write/pattern/1000
+Benchmarking mixed_write/pattern/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/pattern/1000: Collecting 50 samples in estimated 2.0035 s (14k iterations)
+Benchmarking mixed_write/pattern/1000: Analyzing
+mixed_write/pattern/1000
+                        time:   [144.17 µs 145.84 µs 147.91 µs]
+                        thrpt:  [122.59 MiB/s 124.33 MiB/s 125.77 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  2 (4.00%) high mild
+  5 (10.00%) high severe
+Benchmarking mixed_write/nested/1000
+Benchmarking mixed_write/nested/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/nested/1000: Collecting 50 samples in estimated 2.0027 s (20k iterations)
+Benchmarking mixed_write/nested/1000: Analyzing
+mixed_write/nested/1000 time:   [97.647 µs 98.011 µs 98.443 µs]
+                        thrpt:  [367.19 MiB/s 368.81 MiB/s 370.18 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  2 (4.00%) high mild
+  1 (2.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-screen/baseline-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-screen/baseline-build.txt
new file mode 100644
index 0000000..121796e
--- /dev/null
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@@ -0,0 +1,3 @@
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+    Finished `bench` profile [optimized] target(s) in 2.87s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-screen/baseline.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-screen/baseline.lock
new file mode 100644
index 0000000..78a11b2
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-screen/criterion-SHA256SUMS b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-screen/criterion-SHA256SUMS
new file mode 100644
index 0000000..792e23a
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-screen/criterion-SHA256SUMS
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-screen/criterion-results.tar.gz b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-screen/criterion-results.tar.gz
new file mode 100644
index 0000000..d6c23bd
Binary files /dev/null and b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-screen/criterion-results.tar.gz differ
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-screen/current-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-screen/current-0.txt
new file mode 100644
index 0000000..6960477
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-screen/current-0.txt
@@ -0,0 +1,94 @@
+memcap: <=7783 MiB (60% of 12972 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_read/text/1000
+Benchmarking mixed_read/text/1000: Warming up for 1.0000 s
+Benchmarking mixed_read/text/1000: Collecting 50 samples in estimated 2.0049 s (2800 iterations)
+Benchmarking mixed_read/text/1000: Analyzing
+mixed_read/text/1000    time:   [716.30 µs 721.24 µs 727.21 µs]
+                        thrpt:  [37.904 MiB/s 38.217 MiB/s 38.481 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  1 (2.00%) high mild
+  6 (12.00%) high severe
+Benchmarking mixed_read/scalar/1000
+Benchmarking mixed_read/scalar/1000: Warming up for 1.0000 s
+Benchmarking mixed_read/scalar/1000: Collecting 50 samples in estimated 2.0102 s (5200 iterations)
+Benchmarking mixed_read/scalar/1000: Analyzing
+mixed_read/scalar/1000  time:   [388.73 µs 392.00 µs 395.87 µs]
+                        thrpt:  [100.95 MiB/s 101.94 MiB/s 102.80 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  5 (10.00%) high mild
+  2 (4.00%) high severe
+Benchmarking mixed_read/enum/1000
+Benchmarking mixed_read/enum/1000: Warming up for 1.0000 s
+Benchmarking mixed_read/enum/1000: Collecting 50 samples in estimated 2.0152 s (6250 iterations)
+Benchmarking mixed_read/enum/1000: Analyzing
+mixed_read/enum/1000    time:   [321.75 µs 323.81 µs 326.46 µs]
+                        thrpt:  [58.463 MiB/s 58.942 MiB/s 59.318 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  2 (4.00%) high mild
+  2 (4.00%) high severe
+Benchmarking mixed_read/pattern/1000
+Benchmarking mixed_read/pattern/1000: Warming up for 1.0000 s
+Benchmarking mixed_read/pattern/1000: Collecting 50 samples in estimated 2.0073 s (4950 iterations)
+Benchmarking mixed_read/pattern/1000: Analyzing
+mixed_read/pattern/1000 time:   [400.88 µs 402.72 µs 404.94 µs]
+                        thrpt:  [44.777 MiB/s 45.024 MiB/s 45.231 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  1 (2.00%) high mild
+  2 (4.00%) high severe
+Benchmarking mixed_read/nested/1000
+Benchmarking mixed_read/nested/1000: Warming up for 1.0000 s
+Benchmarking mixed_read/nested/1000: Collecting 50 samples in estimated 2.0291 s (3250 iterations)
+Benchmarking mixed_read/nested/1000: Analyzing
+mixed_read/nested/1000  time:   [622.38 µs 627.34 µs 633.43 µs]
+                        thrpt:  [57.066 MiB/s 57.620 MiB/s 58.078 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  1 (2.00%) high mild
+  5 (10.00%) high severe
+
+Benchmarking mixed_write/text/1000
+Benchmarking mixed_write/text/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/text/1000: Collecting 50 samples in estimated 2.0027 s (13k iterations)
+Benchmarking mixed_write/text/1000: Analyzing
+mixed_write/text/1000   time:   [142.10 µs 142.85 µs 143.75 µs]
+                        thrpt:  [191.75 MiB/s 192.95 MiB/s 193.98 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  3 (6.00%) high mild
+  3 (6.00%) high severe
+Benchmarking mixed_write/scalar/1000
+Benchmarking mixed_write/scalar/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/scalar/1000: Collecting 50 samples in estimated 2.0024 s (20k iterations)
+Benchmarking mixed_write/scalar/1000: Analyzing
+mixed_write/scalar/1000 time:   [99.327 µs 99.939 µs 100.72 µs]
+                        thrpt:  [396.78 MiB/s 399.86 MiB/s 402.32 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  3 (6.00%) high mild
+  3 (6.00%) high severe
+Benchmarking mixed_write/enum/1000
+Benchmarking mixed_write/enum/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/enum/1000: Collecting 50 samples in estimated 2.0018 s (25k iterations)
+Benchmarking mixed_write/enum/1000: Analyzing
+mixed_write/enum/1000   time:   [79.279 µs 80.023 µs 81.000 µs]
+                        thrpt:  [235.63 MiB/s 238.50 MiB/s 240.74 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  2 (4.00%) high mild
+  4 (8.00%) high severe
+Benchmarking mixed_write/pattern/1000
+Benchmarking mixed_write/pattern/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/pattern/1000: Collecting 50 samples in estimated 2.0013 s (13k iterations)
+Benchmarking mixed_write/pattern/1000: Analyzing
+mixed_write/pattern/1000
+                        time:   [144.43 µs 145.64 µs 147.25 µs]
+                        thrpt:  [123.14 MiB/s 124.50 MiB/s 125.55 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  2 (4.00%) high mild
+  4 (8.00%) high severe
+Benchmarking mixed_write/nested/1000
+Benchmarking mixed_write/nested/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/nested/1000: Collecting 50 samples in estimated 2.0035 s (20k iterations)
+Benchmarking mixed_write/nested/1000: Analyzing
+mixed_write/nested/1000 time:   [99.022 µs 99.700 µs 100.58 µs]
+                        thrpt:  [359.40 MiB/s 362.56 MiB/s 365.04 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  2 (4.00%) high mild
+  2 (4.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-screen/current-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-screen/current-1.txt
new file mode 100644
index 0000000..9428b69
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-screen/current-1.txt
@@ -0,0 +1,91 @@
+memcap: <=7795 MiB (60% of 12991 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_read/text/1000
+Benchmarking mixed_read/text/1000: Warming up for 1.0000 s
+Benchmarking mixed_read/text/1000: Collecting 50 samples in estimated 2.0324 s (2650 iterations)
+Benchmarking mixed_read/text/1000: Analyzing
+mixed_read/text/1000    time:   [716.73 µs 724.01 µs 733.80 µs]
+                        thrpt:  [37.564 MiB/s 38.072 MiB/s 38.458 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  4 (8.00%) high mild
+  1 (2.00%) high severe
+Benchmarking mixed_read/scalar/1000
+Benchmarking mixed_read/scalar/1000: Warming up for 1.0000 s
+Benchmarking mixed_read/scalar/1000: Collecting 50 samples in estimated 2.0132 s (5100 iterations)
+Benchmarking mixed_read/scalar/1000: Analyzing
+mixed_read/scalar/1000  time:   [383.27 µs 385.36 µs 388.03 µs]
+                        thrpt:  [102.99 MiB/s 103.70 MiB/s 104.26 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  2 (4.00%) high mild
+  2 (4.00%) high severe
+Benchmarking mixed_read/enum/1000
+Benchmarking mixed_read/enum/1000: Warming up for 1.0000 s
+Benchmarking mixed_read/enum/1000: Collecting 50 samples in estimated 2.0101 s (6250 iterations)
+Benchmarking mixed_read/enum/1000: Analyzing
+mixed_read/enum/1000    time:   [319.60 µs 321.66 µs 324.19 µs]
+                        thrpt:  [58.872 MiB/s 59.335 MiB/s 59.717 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  5 (10.00%) high severe
+Benchmarking mixed_read/pattern/1000
+Benchmarking mixed_read/pattern/1000: Warming up for 1.0000 s
+Benchmarking mixed_read/pattern/1000: Collecting 50 samples in estimated 2.0059 s (5000 iterations)
+Benchmarking mixed_read/pattern/1000: Analyzing
+mixed_read/pattern/1000 time:   [400.70 µs 402.70 µs 405.12 µs]
+                        thrpt:  [44.757 MiB/s 45.026 MiB/s 45.252 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  3 (6.00%) high severe
+Benchmarking mixed_read/nested/1000
+Benchmarking mixed_read/nested/1000: Warming up for 1.0000 s
+Benchmarking mixed_read/nested/1000: Collecting 50 samples in estimated 2.0185 s (3100 iterations)
+Benchmarking mixed_read/nested/1000: Analyzing
+mixed_read/nested/1000  time:   [625.31 µs 629.60 µs 634.61 µs]
+                        thrpt:  [56.960 MiB/s 57.413 MiB/s 57.807 MiB/s]
+Found 1 outliers among 50 measurements (2.00%)
+  1 (2.00%) high severe
+
+Benchmarking mixed_write/text/1000
+Benchmarking mixed_write/text/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/text/1000: Collecting 50 samples in estimated 2.0051 s (14k iterations)
+Benchmarking mixed_write/text/1000: Analyzing
+mixed_write/text/1000   time:   [141.48 µs 143.05 µs 144.95 µs]
+                        thrpt:  [190.16 MiB/s 192.69 MiB/s 194.82 MiB/s]
+Found 8 outliers among 50 measurements (16.00%)
+  1 (2.00%) high mild
+  7 (14.00%) high severe
+Benchmarking mixed_write/scalar/1000
+Benchmarking mixed_write/scalar/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/scalar/1000: Collecting 50 samples in estimated 2.0048 s (20k iterations)
+Benchmarking mixed_write/scalar/1000: Analyzing
+mixed_write/scalar/1000 time:   [98.733 µs 99.487 µs 100.48 µs]
+                        thrpt:  [397.69 MiB/s 401.68 MiB/s 404.74 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  1 (2.00%) high mild
+  2 (4.00%) high severe
+Benchmarking mixed_write/enum/1000
+Benchmarking mixed_write/enum/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/enum/1000: Collecting 50 samples in estimated 2.0012 s (25k iterations)
+Benchmarking mixed_write/enum/1000: Analyzing
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+                        thrpt:  [235.79 MiB/s 238.36 MiB/s 240.49 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  2 (4.00%) high mild
+  3 (6.00%) high severe
+Benchmarking mixed_write/pattern/1000
+Benchmarking mixed_write/pattern/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/pattern/1000: Collecting 50 samples in estimated 2.0062 s (12k iterations)
+Benchmarking mixed_write/pattern/1000: Analyzing
+mixed_write/pattern/1000
+                        time:   [144.15 µs 144.99 µs 145.99 µs]
+                        thrpt:  [124.20 MiB/s 125.05 MiB/s 125.79 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  2 (4.00%) high mild
+  3 (6.00%) high severe
+Benchmarking mixed_write/nested/1000
+Benchmarking mixed_write/nested/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/nested/1000: Collecting 50 samples in estimated 2.0006 s (20k iterations)
+Benchmarking mixed_write/nested/1000: Analyzing
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+                        thrpt:  [341.96 MiB/s 353.92 MiB/s 362.99 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  1 (2.00%) high mild
+  4 (8.00%) high severe
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-screen/current-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-screen/current-build.txt
new file mode 100644
index 0000000..139cb9f
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-screen/current-build.txt
@@ -0,0 +1,4 @@
+memcap: <=7760 MiB (60% of 12934 MiB available) [systemd MemoryMax, swap off]
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+   Compiling core-regression v0.0.0 (/home/bailey/github/polyxml-mixed-nil/benchmarks/rust-xml-regression/target/core-current)
+    Finished `bench` profile [optimized] target(s) in 27.02s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-screen/current.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-screen/current.lock
new file mode 100644
index 0000000..78a11b2
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-screen/harness.rs b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-screen/harness.rs
new file mode 100644
index 0000000..7d0413e
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-screen/harness.rs
@@ -0,0 +1,120 @@
+use criterion::{
+    criterion_group, criterion_main, BenchmarkId, Criterion, SamplingMode, Throughput,
+};
+use polyxml::schema::ModelSchema;
+use polyxml::schema_parser::XsdParser;
+use polyxml::{deserialize, serialize, PolyValue};
+use std::{hint::black_box, sync::Arc};
+
+fn fixture(kind: &str, count: usize) -> (Arc<ModelSchema>, Vec<u8>) {
+    let xsd = r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
+      <xs:simpleType name="State"><xs:restriction base="xs:string"><xs:enumeration value="Ready"/><xs:enumeration value="Done"/></xs:restriction></xs:simpleType>
+      <xs:simpleType name="Code"><xs:restriction base="xs:string"><xs:pattern value="[A-Z]{3}[0-9]{3}"/></xs:restriction></xs:simpleType>
+      <xs:element name="Root"><xs:complexType mixed="true"><xs:choice minOccurs="0" maxOccurs="unbounded">
+        <xs:element name="Text" type="xs:string"/>
+        <xs:element name="Number" type="xs:int"/>
+        <xs:element name="State" type="State"/>
+        <xs:element name="Code" type="Code"/>
+        <xs:element name="Child"><xs:complexType><xs:sequence><xs:element name="Value" type="xs:string"/></xs:sequence></xs:complexType></xs:element>
+      </xs:choice></xs:complexType></xs:element>
+    </xs:schema>"#;
+    let ir = XsdParser::new().parse_str(xsd).unwrap();
+    let schema = ModelSchema::from_ir(&ir, Some("Root")).unwrap();
+    let mut xml = String::from("<Root>");
+    for index in 0..count {
+        let part = match kind {
+            "text" => format!("text-{index}&amp;<![CDATA[more]]>"),
+            "scalar" => format!("<Text>item-{index}&amp;<![CDATA[more]]></Text>"),
+            "enum" => "<State>Ready</State>".into(),
+            "pattern" => format!("<Code>ABC{:03}</Code>", index % 1000),
+            "nested" => format!("<Child><Value>item-{index}</Value></Child>"),
+            _ => unreachable!(),
+        };
+        xml.push_str(&part);
+    }
+    xml.push_str("</Root>");
+    let value = deserialize(xml.as_bytes(), Arc::clone(&schema)).unwrap();
+    let items_name = &schema.fields[schema.mixed_content.as_ref().unwrap().items_index].name;
+    let items = value.get(items_name).and_then(PolyValue::as_list).unwrap();
+    if kind == "text" {
+        // Text, GeneralRef and CData become separate ordered items.
+        assert_eq!(items.len(), count * 3);
+        for (index, items) in items.chunks_exact(3).enumerate() {
+            for (item, expected) in
+                items
+                    .iter()
+                    .zip([format!("text-{index}"), "&".into(), "more".into()])
+            {
+                assert_eq!(item.get("kind").and_then(PolyValue::as_str), Some("#text"));
+                assert_eq!(
+                    item.get("value").and_then(PolyValue::as_str),
+                    Some(expected.as_str())
+                );
+            }
+        }
+    } else {
+        assert_eq!(items.len(), count);
+        for (index, item) in items.iter().enumerate() {
+            let value = item.get("value").unwrap();
+            match kind {
+                "scalar" => assert_eq!(value.as_str(), Some(format!("item-{index}&more").as_str())),
+                "enum" => assert_eq!(value.as_str(), Some("Ready")),
+                "pattern" => assert_eq!(
+                    value.as_str(),
+                    Some(format!("ABC{:03}", index % 1000).as_str())
+                ),
+                "nested" => assert_eq!(
+                    value.get("value").and_then(PolyValue::as_str),
+                    Some(format!("item-{index}").as_str())
+                ),
+                _ => unreachable!(),
+            }
+        }
+    }
+    let output = serialize("Root", &value, &schema, None).unwrap();
+    let reparsed = deserialize(&output, Arc::clone(&schema)).unwrap();
+    if kind == "text" {
+        // XML writers coalesce adjacent text segments. Compare their text value
+        // rather than treating the reader's segmentation as XML semantics.
+        let text = |value: &PolyValue| -> String {
+            value
+                .get(items_name)
+                .unwrap()
+                .as_list()
+                .unwrap()
+                .iter()
+                .map(|item| item.get("value").unwrap().as_str().unwrap())
+                .collect()
+        };
+        assert_eq!(text(&value), text(&reparsed));
+    } else {
+        assert_eq!(value, reparsed);
+    }
+    (schema, xml.into_bytes())
+}
+
+fn benchmarks(c: &mut Criterion) {
+    for operation in ["mixed_read", "mixed_write"] {
+        let mut group = c.benchmark_group(operation);
+        group.sampling_mode(SamplingMode::Flat);
+        for kind in ["text", "scalar", "enum", "pattern", "nested"] {
+            let (schema, xml) = fixture(kind, 1000);
+            let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+            group.throughput(Throughput::Bytes(xml.len() as u64));
+            group.bench_function(BenchmarkId::new(kind, 1000), |b| {
+                if operation == "mixed_read" {
+                    b.iter(|| {
+                        black_box(deserialize(black_box(&xml), Arc::clone(&schema)).unwrap())
+                    });
+                } else {
+                    b.iter(|| {
+                        black_box(serialize("Root", black_box(&value), &schema, None).unwrap())
+                    });
+                }
+            });
+        }
+        group.finish();
+    }
+}
+criterion_group!(benches, benchmarks);
+criterion_main!(benches);
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-screen/metadata.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-screen/metadata.json
new file mode 100644
index 0000000..6359051
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-screen/metadata.json
@@ -0,0 +1,19 @@
+{
+  "revisions": {
+    "baseline": "1819c91b0808b9242c642d82350d2b657b60108c",
+    "current": "f4ad13daf5a5fcfeb33481543dc75b3354be6ee3"
+  },
+  "core_status": {
+    "baseline": "",
+    "current": ""
+  },
+  "sample_size": 50,
+  "warmup_seconds": 1.0,
+  "measurement_seconds": 2.0,
+  "rounds": 2,
+  "filter": "",
+  "order": "alternate baseline/current per round",
+  "os": "Linux-6.18.40.1-microsoft-standard-WSL2-x86_64-with-glibc2.43",
+  "cpu": "11th Gen Intel(R) Core(TM) i5-11600K @ 3.90GHz",
+  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)\nbinary: rustc\ncommit-hash: b940084d7eb6a299eb4bfeb8e34901bc051e7ac4\ncommit-date: 2026-09-28\nhost: x86_64-unknown-linux-gnu\nrelease: 1.99.0\nLLVM version: 23.1.1\n"
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-screen/summary.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-screen/summary.json
new file mode 100644
index 0000000..5cebef4
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-nil-screen/summary.json
@@ -0,0 +1,522 @@
+{
+  "mixed_read/enum/1000": {
+    "baseline_ns": 323219.0012155783,
+    "candidate_ns": 322735.56568,
+    "delta_percent": -0.14956903330564097,
+    "speedup": 1.001497930773634,
+    "process_deltas_percent": [
+      0.38288482186426,
+      -0.6799069646732159
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 320818.78842338704,
+            "upper_bound": 324726.6861975806
+          },
+          "point_estimate": 322575.50096774194,
+          "standard_error": 1003.4205280404196
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 321675.64293089457,
+            "upper_bound": 326437.9182113822
+          },
+          "point_estimate": 323862.50146341464,
+          "standard_error": 1216.5351375832824
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 321752.74359200004,
+            "upper_bound": 326458.70686800004
+          },
+          "point_estimate": 323810.5936,
+          "standard_error": 1215.460809454811
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 319603.03445199993,
+            "upper_bound": 324190.764112
+          },
+          "point_estimate": 321660.53776,
+          "standard_error": 1178.0035349515347
+        }
+      ]
+    }
+  },
+  "mixed_read/nested/1000": {
+    "baseline_ns": 627722.33890625,
+    "candidate_ns": 628467.653598015,
+    "delta_percent": 0.11873317955573004,
+    "speedup": 0.9988140762893714,
+    "process_deltas_percent": [
+      -0.46229501121144434,
+      0.7044587354649856
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
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+            "lower_bound": 625209.7129921875,
+            "upper_bound": 636187.9821015625
+          },
+          "point_estimate": 630249.556875,
+          "standard_error": 2818.648338176638
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+            "upper_bound": 629273.6601875001
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+          "standard_error": 2841.128567946289
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+          "standard_error": 2370.6827330143387
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+      ]
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+  },
+  "mixed_read/pattern/1000": {
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+    "candidate_ns": 402712.96154646465,
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+          "standard_error": 2457.3857646051506
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+            "upper_bound": 416922.2976414142
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+          "standard_error": 3593.9759758245787
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+      "current": [
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+          "standard_error": 1136.7470964894849
+        }
+      ]
+    }
+  },
+  "mixed_read/scalar/1000": {
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+    "candidate_ns": 388679.9424095023,
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+            "lower_bound": 97646.55521428572,
+            "upper_bound": 98443.067817734
+          },
+          "point_estimate": 98010.7445812808,
+          "standard_error": 203.33416764856992
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
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+            "lower_bound": 99021.83223875,
+            "upper_bound": 100576.63528749999
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+          "point_estimate": 99699.92614999998,
+          "standard_error": 399.891068408715
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+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
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+          "point_estimate": 102134.1064851485,
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+            "upper_bound": 145897.39522947764
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+          "point_estimate": 144940.29014925376,
+          "standard_error": 440.8539337213257
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+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 144169.9971768953,
+            "upper_bound": 147908.8295866426
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+          "point_estimate": 145837.56657039712,
+          "standard_error": 960.5489441207756
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+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 144426.46965055758,
+            "upper_bound": 147250.4885408922
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+          "point_estimate": 145637.1773977695,
+          "standard_error": 731.008228036759
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+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 144146.2420909091,
+            "upper_bound": 145991.63924380168
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+          "point_estimate": 144994.72148760332,
+          "standard_error": 473.64871926340805
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+  "mixed_write/scalar/1000": {
+    "baseline_ns": 111647.25303616078,
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+    "delta_percent": -10.688985406114316,
+    "speedup": 1.1196827228390493,
+    "process_deltas_percent": [
+      -10.661863131614668,
+      -10.716214228281796
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+    "process_estimates": {
+      "baseline": [
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+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 111097.41358169011,
+            "upper_bound": 112823.03960140845
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+          "point_estimate": 111866.12174647888,
+          "standard_error": 443.96955871942924
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+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 110469.63483005617,
+            "upper_bound": 112589.27884691014
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+          "point_estimate": 111428.38432584266,
+          "standard_error": 544.3897910371863
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+      ],
+      "current": [
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+          "confidence_interval": {
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+            "lower_bound": 99327.32520149252,
+            "upper_bound": 100715.48073507466
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+          "point_estimate": 99939.10895522387,
+          "standard_error": 357.45764378762215
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+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 98733.33398014886,
+            "upper_bound": 100484.96155210916
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+          "point_estimate": 99487.47995037219,
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+  "mixed_write/text/1000": {
+    "baseline_ns": 145767.72628915176,
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+          "standard_error": 354.6287652945572
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+        {
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+            "upper_bound": 146534.77103159856
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+          "point_estimate": 145478.43650557622,
+          "standard_error": 500.436579644816
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+            "lower_bound": 142095.5773847656,
+            "upper_bound": 143746.43841992188
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+          "point_estimate": 142854.076875,
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+            "lower_bound": 141484.93001052632,
+            "upper_bound": 144951.77021052636
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+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-isolated-tests.log b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-isolated-tests.log
new file mode 100644
index 0000000..211c16c
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-isolated-tests.log
@@ -0,0 +1,105 @@
+memcap: <=7758 MiB (60% of 12930 MiB available) [systemd MemoryMax, swap off]
+   Compiling proc-macro2 v1.0.107
+   Compiling unicode-ident v1.0.24
+   Compiling quote v1.0.47
+   Compiling syn v3.0.5
+   Compiling serde_core v1.0.229
+   Compiling syn v2.0.119
+   Compiling memchr v2.8.3
+   Compiling siphasher v1.0.3
+   Compiling serde v1.0.229
+   Compiling serde_derive v1.0.229
+   Compiling zerocopy v0.8.57
+   Compiling libc v0.2.189
+   Compiling zmij v1.0.23
+   Compiling cfg-if v1.0.4
+   Compiling lexical-util v1.0.7
+   Compiling zerocopy-derive v0.8.57
+   Compiling serde_json v1.0.151
+   Compiling shlex v2.0.1
+   Compiling find-msvc-tools v0.1.12
+   Compiling cc v1.4.5
+   Compiling phf_shared v0.14.0
+   Compiling aho-corasick v1.1.5
+   Compiling regex-syntax v0.8.11
+   Compiling fastrand v2.5.0
+   Compiling autocfg v1.5.1
+   Compiling itoa v1.0.18
+   Compiling num-traits v0.2.19
+   Compiling regex-automata v0.4.18
+   Compiling half v2.7.1
+   Compiling alloca v0.4.0
+   Compiling lexical-write-integer v1.0.6
+   Compiling lexical-parse-integer v1.0.6
+   Compiling either v1.18.0
+   Compiling rustix v1.1.5
+   Compiling getrandom v0.4.3
+   Compiling clap_lex v1.1.0
+   Compiling ciborium-io v0.2.2
+   Compiling anstyle v1.0.14
+   Compiling thiserror v2.0.21
+   Compiling phf_generator v0.14.0
+   Compiling clap_builder v4.6.7
+   Compiling ciborium-ll v0.2.2
+   Compiling itertools v0.13.0
+   Compiling lexical-parse-float v1.0.6
+   Compiling lexical-write-float v1.0.6
+   Compiling regex v1.13.1
+   Compiling thiserror-impl v2.0.21
+   Compiling linux-raw-sys v0.12.1
+   Compiling same-file v1.0.6
+   Compiling cast v0.3.0
+   Compiling memo-map v0.3.4
+   Compiling bitflags v2.13.2
+   Compiling minijinja v2.24.0
+   Compiling criterion-plot v0.8.2
+   Compiling walkdir v2.5.0
+   Compiling phf_codegen v0.14.0
+   Compiling lexical-core v1.0.6
+   Compiling ciborium v0.2.2
+   Compiling clap v4.6.7
+   Compiling phf_macros v0.14.0
+   Compiling tinytemplate v1.2.1
+   Compiling page_size v0.6.0
+   Compiling quick-xml v0.42.0
+   Compiling oorandom v11.1.5
+   Compiling yansi v1.0.1
+   Compiling heck v0.5.0
+   Compiling diff v0.1.13
+   Compiling anes v0.1.6
+   Compiling smallvec v1.16.2
+   Compiling once_cell v1.21.4
+   Compiling tempfile v3.27.0
+   Compiling polyxml v0.34.6 (/home/bailey/github/polyxml-mixed-writer/crates/polyxml-core)
+   Compiling criterion v0.8.2
+   Compiling pretty_assertions v1.4.1
+   Compiling phf v0.14.0
+    Finished `test` profile [unoptimized + debuginfo] target(s) in 39.49s
+     Running tests/test_mixed_nil.rs (/home/bailey/github/PolyXML/target/followup-mixed-writer-verification/debug/deps/test_mixed_nil-1aec7ae934470d6f)
+
+running 2 tests
+test nil_scalar_and_nested_items_keep_order_and_differ_from_empty_strings ... ok
+test nil_instance_prefix_does_not_rebind_the_element_namespace ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_runtime_fast_paths.rs (/home/bailey/github/PolyXML/target/followup-mixed-writer-verification/debug/deps/test_runtime_fast_paths-cb1357dd8af777c0)
+
+running 6 tests
+test repeated_lexical_lists_keep_whitespace_validation ... ok
+test lexical_list_formatting_preserves_escaping_empty_lists_and_long_numbers ... ok
+test repeated_nested_records_validate_their_own_lexical_lists ... ok
+test indexed_scalar_state_preserves_enum_pattern_and_split_text ... ok
+test cached_patterns_keep_raw_restriction_and_trimmed_pattern_semantics ... ok
+test unified_scalar_state_keeps_mixed_branch_order_nil_and_nested_frames ... ok
+
+test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_value_constraints.rs (/home/bailey/github/PolyXML/target/followup-mixed-writer-verification/debug/deps/test_value_constraints-22fd91427282898a)
+
+running 2 tests
+test fixed_constraints_cover_input_and_output_in_value_space ... ok
+test repeated_particle_cardinality_belongs_to_the_group ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-isolation-screen/baseline-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-isolation-screen/baseline-0.txt
new file mode 100644
index 0000000..cdd5dab
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-isolation-screen/baseline-0.txt
@@ -0,0 +1,46 @@
+memcap: <=7736 MiB (60% of 12894 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_write/text/1000
+Benchmarking mixed_write/text/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/text/1000: Collecting 50 samples in estimated 2.0000 s (14k iterations)
+Benchmarking mixed_write/text/1000: Analyzing
+mixed_write/text/1000   time:   [142.23 µs 142.62 µs 143.10 µs]
+                        thrpt:  [192.63 MiB/s 193.26 MiB/s 193.80 MiB/s]
+Found 1 outliers among 50 measurements (2.00%)
+  1 (2.00%) high severe
+Benchmarking mixed_write/scalar/1000
+Benchmarking mixed_write/scalar/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/scalar/1000: Collecting 50 samples in estimated 2.0039 s (19k iterations)
+Benchmarking mixed_write/scalar/1000: Analyzing
+mixed_write/scalar/1000 time:   [105.55 µs 106.13 µs 106.92 µs]
+                        thrpt:  [373.76 MiB/s 376.52 MiB/s 378.61 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  5 (10.00%) high mild
+  2 (4.00%) high severe
+Benchmarking mixed_write/enum/1000
+Benchmarking mixed_write/enum/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/enum/1000: Collecting 50 samples in estimated 2.0024 s (25k iterations)
+Benchmarking mixed_write/enum/1000: Analyzing
+mixed_write/enum/1000   time:   [80.399 µs 81.100 µs 82.063 µs]
+                        thrpt:  [232.58 MiB/s 235.34 MiB/s 237.39 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  3 (6.00%) high severe
+Benchmarking mixed_write/pattern/1000
+Benchmarking mixed_write/pattern/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/pattern/1000: Collecting 50 samples in estimated 2.0001 s (14k iterations)
+Benchmarking mixed_write/pattern/1000: Analyzing
+mixed_write/pattern/1000
+                        time:   [146.30 µs 148.01 µs 150.05 µs]
+                        thrpt:  [120.84 MiB/s 122.51 MiB/s 123.94 MiB/s]
+Found 8 outliers among 50 measurements (16.00%)
+  4 (8.00%) high mild
+  4 (8.00%) high severe
+Benchmarking mixed_write/nested/1000
+Benchmarking mixed_write/nested/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/nested/1000: Collecting 50 samples in estimated 2.0023 s (20k iterations)
+Benchmarking mixed_write/nested/1000: Analyzing
+mixed_write/nested/1000 time:   [97.582 µs 98.059 µs 98.629 µs]
+                        thrpt:  [366.49 MiB/s 368.62 MiB/s 370.43 MiB/s]
+Found 4 outliers among 50 measurements (8.00%)
+  2 (4.00%) high mild
+  2 (4.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-isolation-screen/baseline-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-isolation-screen/baseline-1.txt
new file mode 100644
index 0000000..d662b48
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-isolation-screen/baseline-1.txt
@@ -0,0 +1,46 @@
+memcap: <=7780 MiB (60% of 12967 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_write/text/1000
+Benchmarking mixed_write/text/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/text/1000: Collecting 50 samples in estimated 2.0046 s (13k iterations)
+Benchmarking mixed_write/text/1000: Analyzing
+mixed_write/text/1000   time:   [145.29 µs 145.97 µs 146.83 µs]
+                        thrpt:  [187.73 MiB/s 188.84 MiB/s 189.71 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  2 (4.00%) high mild
+  1 (2.00%) high severe
+Benchmarking mixed_write/scalar/1000
+Benchmarking mixed_write/scalar/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/scalar/1000: Collecting 50 samples in estimated 2.0052 s (17k iterations)
+Benchmarking mixed_write/scalar/1000: Analyzing
+mixed_write/scalar/1000 time:   [117.91 µs 118.62 µs 119.55 µs]
+                        thrpt:  [334.27 MiB/s 336.88 MiB/s 338.92 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  3 (6.00%) high severe
+Benchmarking mixed_write/enum/1000
+Benchmarking mixed_write/enum/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/enum/1000: Collecting 50 samples in estimated 2.0002 s (25k iterations)
+Benchmarking mixed_write/enum/1000: Analyzing
+mixed_write/enum/1000   time:   [80.277 µs 80.786 µs 81.389 µs]
+                        thrpt:  [234.50 MiB/s 236.25 MiB/s 237.75 MiB/s]
+Found 1 outliers among 50 measurements (2.00%)
+  1 (2.00%) high severe
+Benchmarking mixed_write/pattern/1000
+Benchmarking mixed_write/pattern/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/pattern/1000: Collecting 50 samples in estimated 2.0015 s (12k iterations)
+Benchmarking mixed_write/pattern/1000: Analyzing
+mixed_write/pattern/1000
+                        time:   [144.41 µs 146.59 µs 149.52 µs]
+                        thrpt:  [121.27 MiB/s 123.70 MiB/s 125.56 MiB/s]
+Found 7 outliers among 50 measurements (14.00%)
+  1 (2.00%) high mild
+  6 (12.00%) high severe
+Benchmarking mixed_write/nested/1000
+Benchmarking mixed_write/nested/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/nested/1000: Collecting 50 samples in estimated 2.0034 s (21k iterations)
+Benchmarking mixed_write/nested/1000: Analyzing
+mixed_write/nested/1000 time:   [97.383 µs 98.132 µs 99.040 µs]
+                        thrpt:  [364.98 MiB/s 368.35 MiB/s 371.19 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  2 (4.00%) high mild
+  4 (8.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-isolation-screen/baseline-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-isolation-screen/baseline-build.txt
new file mode 100644
index 0000000..ff55112
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-isolation-screen/baseline-build.txt
@@ -0,0 +1,3 @@
+memcap: <=7764 MiB (60% of 12940 MiB available) [systemd MemoryMax, swap off]
+   Compiling core-regression v0.0.0 (/home/bailey/github/polyxml-mixed-writer/benchmarks/rust-xml-regression/target/core-baseline)
+    Finished `bench` profile [optimized] target(s) in 2.83s
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-isolation-screen/baseline.lock b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-isolation-screen/baseline.lock
new file mode 100644
index 0000000..78a11b2
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-isolation-screen/baseline.lock
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new file mode 100644
index 0000000..178118d
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-isolation-screen/criterion-SHA256SUMS
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-isolation-screen/criterion-results.tar.gz b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-isolation-screen/criterion-results.tar.gz
new file mode 100644
index 0000000..5cc3535
Binary files /dev/null and b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-isolation-screen/criterion-results.tar.gz differ
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-isolation-screen/current-0.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-isolation-screen/current-0.txt
new file mode 100644
index 0000000..ee246b7
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-isolation-screen/current-0.txt
@@ -0,0 +1,46 @@
+memcap: <=7774 MiB (60% of 12957 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_write/text/1000
+Benchmarking mixed_write/text/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/text/1000: Collecting 50 samples in estimated 2.0023 s (14k iterations)
+Benchmarking mixed_write/text/1000: Analyzing
+mixed_write/text/1000   time:   [143.01 µs 144.75 µs 146.99 µs]
+                        thrpt:  [187.53 MiB/s 190.43 MiB/s 192.74 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  3 (6.00%) high severe
+Benchmarking mixed_write/scalar/1000
+Benchmarking mixed_write/scalar/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/scalar/1000: Collecting 50 samples in estimated 2.0030 s (17k iterations)
+Benchmarking mixed_write/scalar/1000: Analyzing
+mixed_write/scalar/1000 time:   [118.36 µs 119.46 µs 120.87 µs]
+                        thrpt:  [330.62 MiB/s 334.51 MiB/s 337.62 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  1 (2.00%) high mild
+  4 (8.00%) high severe
+Benchmarking mixed_write/enum/1000
+Benchmarking mixed_write/enum/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/enum/1000: Collecting 50 samples in estimated 2.0010 s (26k iterations)
+Benchmarking mixed_write/enum/1000: Analyzing
+mixed_write/enum/1000   time:   [75.178 µs 76.163 µs 77.283 µs]
+                        thrpt:  [246.96 MiB/s 250.59 MiB/s 253.88 MiB/s]
+Found 8 outliers among 50 measurements (16.00%)
+  4 (8.00%) high mild
+  4 (8.00%) high severe
+Benchmarking mixed_write/pattern/1000
+Benchmarking mixed_write/pattern/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/pattern/1000: Collecting 50 samples in estimated 2.0027 s (14k iterations)
+Benchmarking mixed_write/pattern/1000: Analyzing
+mixed_write/pattern/1000
+                        time:   [137.91 µs 138.81 µs 139.84 µs]
+                        thrpt:  [129.66 MiB/s 130.63 MiB/s 131.48 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  4 (8.00%) high mild
+  2 (4.00%) high severe
+Benchmarking mixed_write/nested/1000
+Benchmarking mixed_write/nested/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/nested/1000: Collecting 50 samples in estimated 2.0043 s (21k iterations)
+Benchmarking mixed_write/nested/1000: Analyzing
+mixed_write/nested/1000 time:   [95.759 µs 96.769 µs 98.066 µs]
+                        thrpt:  [368.60 MiB/s 373.54 MiB/s 377.48 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  5 (10.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-isolation-screen/current-1.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-isolation-screen/current-1.txt
new file mode 100644
index 0000000..31a22cf
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-isolation-screen/current-1.txt
@@ -0,0 +1,47 @@
+memcap: <=7775 MiB (60% of 12959 MiB available) [systemd MemoryMax, swap off]
+Benchmarking mixed_write/text/1000
+Benchmarking mixed_write/text/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/text/1000: Collecting 50 samples in estimated 2.0040 s (14k iterations)
+Benchmarking mixed_write/text/1000: Analyzing
+mixed_write/text/1000   time:   [142.17 µs 142.62 µs 143.16 µs]
+                        thrpt:  [192.54 MiB/s 193.26 MiB/s 193.88 MiB/s]
+Found 2 outliers among 50 measurements (4.00%)
+  1 (2.00%) high mild
+  1 (2.00%) high severe
+Benchmarking mixed_write/scalar/1000
+Benchmarking mixed_write/scalar/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/scalar/1000: Collecting 50 samples in estimated 2.0038 s (18k iterations)
+Benchmarking mixed_write/scalar/1000: Analyzing
+mixed_write/scalar/1000 time:   [107.84 µs 109.57 µs 112.00 µs]
+                        thrpt:  [356.80 MiB/s 364.71 MiB/s 370.58 MiB/s]
+Found 5 outliers among 50 measurements (10.00%)
+  5 (10.00%) high severe
+Benchmarking mixed_write/enum/1000
+Benchmarking mixed_write/enum/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/enum/1000: Collecting 50 samples in estimated 2.0015 s (25k iterations)
+Benchmarking mixed_write/enum/1000: Analyzing
+mixed_write/enum/1000   time:   [75.641 µs 75.907 µs 76.201 µs]
+                        thrpt:  [250.47 MiB/s 251.44 MiB/s 252.32 MiB/s]
+Found 3 outliers among 50 measurements (6.00%)
+  2 (4.00%) high mild
+  1 (2.00%) high severe
+Benchmarking mixed_write/pattern/1000
+Benchmarking mixed_write/pattern/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/pattern/1000: Collecting 50 samples in estimated 2.0052 s (14k iterations)
+Benchmarking mixed_write/pattern/1000: Analyzing
+mixed_write/pattern/1000
+                        time:   [139.79 µs 141.37 µs 143.19 µs]
+                        thrpt:  [126.63 MiB/s 128.26 MiB/s 129.71 MiB/s]
+Found 10 outliers among 50 measurements (20.00%)
+  7 (14.00%) high mild
+  3 (6.00%) high severe
+Benchmarking mixed_write/nested/1000
+Benchmarking mixed_write/nested/1000: Warming up for 1.0000 s
+Benchmarking mixed_write/nested/1000: Collecting 50 samples in estimated 2.0005 s (20k iterations)
+Benchmarking mixed_write/nested/1000: Analyzing
+mixed_write/nested/1000 time:   [96.815 µs 99.112 µs 102.19 µs]
+                        thrpt:  [353.72 MiB/s 364.71 MiB/s 373.36 MiB/s]
+Found 6 outliers among 50 measurements (12.00%)
+  2 (4.00%) high mild
+  4 (8.00%) high severe
+
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-isolation-screen/current-build.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-isolation-screen/current-build.txt
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--- /dev/null
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+   Compiling core-regression v0.0.0 (/home/bailey/github/polyxml-mixed-writer/benchmarks/rust-xml-regression/target/core-current)
+    Finished `bench` profile [optimized] target(s) in 27.06s
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diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-isolation-screen/harness.rs b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-isolation-screen/harness.rs
new file mode 100644
index 0000000..7d0413e
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-isolation-screen/harness.rs
@@ -0,0 +1,120 @@
+use criterion::{
+    criterion_group, criterion_main, BenchmarkId, Criterion, SamplingMode, Throughput,
+};
+use polyxml::schema::ModelSchema;
+use polyxml::schema_parser::XsdParser;
+use polyxml::{deserialize, serialize, PolyValue};
+use std::{hint::black_box, sync::Arc};
+
+fn fixture(kind: &str, count: usize) -> (Arc<ModelSchema>, Vec<u8>) {
+    let xsd = r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
+      <xs:simpleType name="State"><xs:restriction base="xs:string"><xs:enumeration value="Ready"/><xs:enumeration value="Done"/></xs:restriction></xs:simpleType>
+      <xs:simpleType name="Code"><xs:restriction base="xs:string"><xs:pattern value="[A-Z]{3}[0-9]{3}"/></xs:restriction></xs:simpleType>
+      <xs:element name="Root"><xs:complexType mixed="true"><xs:choice minOccurs="0" maxOccurs="unbounded">
+        <xs:element name="Text" type="xs:string"/>
+        <xs:element name="Number" type="xs:int"/>
+        <xs:element name="State" type="State"/>
+        <xs:element name="Code" type="Code"/>
+        <xs:element name="Child"><xs:complexType><xs:sequence><xs:element name="Value" type="xs:string"/></xs:sequence></xs:complexType></xs:element>
+      </xs:choice></xs:complexType></xs:element>
+    </xs:schema>"#;
+    let ir = XsdParser::new().parse_str(xsd).unwrap();
+    let schema = ModelSchema::from_ir(&ir, Some("Root")).unwrap();
+    let mut xml = String::from("<Root>");
+    for index in 0..count {
+        let part = match kind {
+            "text" => format!("text-{index}&amp;<![CDATA[more]]>"),
+            "scalar" => format!("<Text>item-{index}&amp;<![CDATA[more]]></Text>"),
+            "enum" => "<State>Ready</State>".into(),
+            "pattern" => format!("<Code>ABC{:03}</Code>", index % 1000),
+            "nested" => format!("<Child><Value>item-{index}</Value></Child>"),
+            _ => unreachable!(),
+        };
+        xml.push_str(&part);
+    }
+    xml.push_str("</Root>");
+    let value = deserialize(xml.as_bytes(), Arc::clone(&schema)).unwrap();
+    let items_name = &schema.fields[schema.mixed_content.as_ref().unwrap().items_index].name;
+    let items = value.get(items_name).and_then(PolyValue::as_list).unwrap();
+    if kind == "text" {
+        // Text, GeneralRef and CData become separate ordered items.
+        assert_eq!(items.len(), count * 3);
+        for (index, items) in items.chunks_exact(3).enumerate() {
+            for (item, expected) in
+                items
+                    .iter()
+                    .zip([format!("text-{index}"), "&".into(), "more".into()])
+            {
+                assert_eq!(item.get("kind").and_then(PolyValue::as_str), Some("#text"));
+                assert_eq!(
+                    item.get("value").and_then(PolyValue::as_str),
+                    Some(expected.as_str())
+                );
+            }
+        }
+    } else {
+        assert_eq!(items.len(), count);
+        for (index, item) in items.iter().enumerate() {
+            let value = item.get("value").unwrap();
+            match kind {
+                "scalar" => assert_eq!(value.as_str(), Some(format!("item-{index}&more").as_str())),
+                "enum" => assert_eq!(value.as_str(), Some("Ready")),
+                "pattern" => assert_eq!(
+                    value.as_str(),
+                    Some(format!("ABC{:03}", index % 1000).as_str())
+                ),
+                "nested" => assert_eq!(
+                    value.get("value").and_then(PolyValue::as_str),
+                    Some(format!("item-{index}").as_str())
+                ),
+                _ => unreachable!(),
+            }
+        }
+    }
+    let output = serialize("Root", &value, &schema, None).unwrap();
+    let reparsed = deserialize(&output, Arc::clone(&schema)).unwrap();
+    if kind == "text" {
+        // XML writers coalesce adjacent text segments. Compare their text value
+        // rather than treating the reader's segmentation as XML semantics.
+        let text = |value: &PolyValue| -> String {
+            value
+                .get(items_name)
+                .unwrap()
+                .as_list()
+                .unwrap()
+                .iter()
+                .map(|item| item.get("value").unwrap().as_str().unwrap())
+                .collect()
+        };
+        assert_eq!(text(&value), text(&reparsed));
+    } else {
+        assert_eq!(value, reparsed);
+    }
+    (schema, xml.into_bytes())
+}
+
+fn benchmarks(c: &mut Criterion) {
+    for operation in ["mixed_read", "mixed_write"] {
+        let mut group = c.benchmark_group(operation);
+        group.sampling_mode(SamplingMode::Flat);
+        for kind in ["text", "scalar", "enum", "pattern", "nested"] {
+            let (schema, xml) = fixture(kind, 1000);
+            let value = deserialize(&xml, Arc::clone(&schema)).unwrap();
+            group.throughput(Throughput::Bytes(xml.len() as u64));
+            group.bench_function(BenchmarkId::new(kind, 1000), |b| {
+                if operation == "mixed_read" {
+                    b.iter(|| {
+                        black_box(deserialize(black_box(&xml), Arc::clone(&schema)).unwrap())
+                    });
+                } else {
+                    b.iter(|| {
+                        black_box(serialize("Root", black_box(&value), &schema, None).unwrap())
+                    });
+                }
+            });
+        }
+        group.finish();
+    }
+}
+criterion_group!(benches, benchmarks);
+criterion_main!(benches);
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-isolation-screen/metadata.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-isolation-screen/metadata.json
new file mode 100644
index 0000000..b57e4dc
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-isolation-screen/metadata.json
@@ -0,0 +1,19 @@
+{
+  "revisions": {
+    "baseline": "1819c91b0808b9242c642d82350d2b657b60108c",
+    "current": "39ed44899b3dcd9104a7acd09be20269f98dd1eb"
+  },
+  "core_status": {
+    "baseline": "",
+    "current": ""
+  },
+  "sample_size": 50,
+  "warmup_seconds": 1.0,
+  "measurement_seconds": 2.0,
+  "rounds": 2,
+  "filter": "^mixed_write/",
+  "order": "alternate baseline/current per round",
+  "os": "Linux-6.18.40.1-microsoft-standard-WSL2-x86_64-with-glibc2.43",
+  "cpu": "11th Gen Intel(R) Core(TM) i5-11600K @ 3.90GHz",
+  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)\nbinary: rustc\ncommit-hash: b940084d7eb6a299eb4bfeb8e34901bc051e7ac4\ncommit-date: 2026-09-28\nhost: x86_64-unknown-linux-gnu\nrelease: 1.99.0\nLLVM version: 23.1.1\n"
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-isolation-screen/summary.json b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-isolation-screen/summary.json
new file mode 100644
index 0000000..f5e63b5
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-isolation-screen/summary.json
@@ -0,0 +1,262 @@
+{
+  "mixed_write/enum/1000": {
+    "baseline_ns": 80943.0238289008,
+    "candidate_ns": 76034.92368455851,
+    "delta_percent": -6.06364812206317,
+    "speedup": 1.0645506026244496,
+    "process_deltas_percent": [
+      -6.087085795213431,
+      -6.04011952429876
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 80398.95971169356,
+            "upper_bound": 82062.9725141129
+          },
+          "point_estimate": 81099.72592741932,
+          "standard_error": 432.5588122586862
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 80276.59149396379,
+            "upper_bound": 81389.48680382293
+          },
+          "point_estimate": 80786.32173038229,
+          "standard_error": 283.91149913220653
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 75177.98598282442,
+            "upper_bound": 77282.54520801526
+          },
+          "point_estimate": 76163.11603053435,
+          "standard_error": 539.6818695111473
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 75641.19872440945,
+            "upper_bound": 76200.5406988189
+          },
+          "point_estimate": 75906.73133858266,
+          "standard_error": 142.8056119017304
+        }
+      ]
+    }
+  },
+  "mixed_write/nested/1000": {
+    "baseline_ns": 98095.82745121427,
+    "candidate_ns": 97940.60947018498,
+    "delta_percent": -0.15823097175716727,
+    "speedup": 1.0015848173895276,
+    "process_deltas_percent": [
+      -1.3162215956187606,
+      0.9988999805125909
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 97582.39182425747,
+            "upper_bound": 98629.27502599008
+          },
+          "point_estimate": 98059.40163366338,
+          "standard_error": 268.97338433511254
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 97382.90191646488,
+            "upper_bound": 99039.93573002424
+          },
+          "point_estimate": 98132.25326876515,
+          "standard_error": 425.2729430091747
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 95758.70726840853,
+            "upper_bound": 98066.49614845606
+          },
+          "point_estimate": 96768.72261282656,
+          "standard_error": 596.385755294267
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 96815.16179776675,
+            "upper_bound": 102192.06058560796
+          },
+          "point_estimate": 99112.49632754341,
+          "standard_error": 1382.6264655199313
+        }
+      ]
+    }
+  },
+  "mixed_write/pattern/1000": {
+    "baseline_ns": 147297.40687329433,
+    "candidate_ns": 140086.74070658936,
+    "delta_percent": -4.895311003612979,
+    "speedup": 1.0514728669561073,
+    "process_deltas_percent": [
+      -6.218543246919994,
+      -3.5592226419707718
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 146299.35187407405,
+            "upper_bound": 150050.11688703706
+          },
+          "point_estimate": 148009.49585185185,
+          "standard_error": 959.4522045837475
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 144414.80199190282,
+            "upper_bound": 149524.6106417004
+          },
+          "point_estimate": 146585.3178947368,
+          "standard_error": 1323.0680823054886
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 137908.3658409894,
+            "upper_bound": 139844.35776325088
+          },
+          "point_estimate": 138805.4613427562,
+          "standard_error": 495.4473875141164
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 139793.6776443662,
+            "upper_bound": 143193.627915493
+          },
+          "point_estimate": 141368.0200704225,
+          "standard_error": 870.4665474805945
+        }
+      ]
+    }
+  },
+  "mixed_write/scalar/1000": {
+    "baseline_ns": 112379.09573751435,
+    "candidate_ns": 114517.41352818992,
+    "delta_percent": 1.9027718426121387,
+    "speedup": 0.98132757521502,
+    "process_deltas_percent": [
+      12.558204101465641,
+      -7.630816482003066
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 105548.61943351061,
+            "upper_bound": 106917.48299601064
+          },
+          "point_estimate": 106134.52303191488,
+          "standard_error": 355.54824325556365
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 117908.61883083828,
+            "upper_bound": 119548.6554880239
+          },
+          "point_estimate": 118623.66844311383,
+          "standard_error": 423.1173950858115
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 118363.76258605348,
+            "upper_bound": 120867.97351186948
+          },
+          "point_estimate": 119463.11305637982,
+          "standard_error": 644.1515791678934
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 107835.3255666666,
+            "upper_bound": 112001.49328472222
+          },
+          "point_estimate": 109571.71400000002,
+          "standard_error": 1083.117039975249
+        }
+      ]
+    }
+  },
+  "mixed_write/text/1000": {
+    "baseline_ns": 144296.0699592075,
+    "candidate_ns": 143685.29500815616,
+    "delta_percent": -0.4232789924382585,
+    "speedup": 1.0042507825941178,
+    "process_deltas_percent": [
+      1.4880213739523418,
+      -2.2907945647203776
+    ],
+    "process_estimates": {
+      "baseline": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 142231.524507326,
+            "upper_bound": 143095.28006043955
+          },
+          "point_estimate": 142624.12461538464,
+          "standard_error": 221.25600911639467
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 145294.08716477276,
+            "upper_bound": 146830.3591420455
+          },
+          "point_estimate": 145968.01530303032,
+          "standard_error": 395.69350093639514
+        }
+      ],
+      "current": [
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 143013.6117444444,
+            "upper_bound": 146985.28786851853
+          },
+          "point_estimate": 144746.402074074,
+          "standard_error": 1018.5617694058635
+        },
+        {
+          "confidence_interval": {
+            "confidence_level": 0.95,
+            "lower_bound": 142169.0568646209,
+            "upper_bound": 143161.27109927795
+          },
+          "point_estimate": 142624.1879422383,
+          "standard_error": 254.6050521279341
+        }
+      ]
+    }
+  }
+}
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-tests.log b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-tests.log
new file mode 100644
index 0000000..d0927e6
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/mixed-writer-tests.log
@@ -0,0 +1,30 @@
+memcap: <=7766 MiB (60% of 12944 MiB available) [systemd MemoryMax, swap off]
+   Compiling polyxml v0.34.6 (/home/bailey/github/polyxml-mixed-writer/crates/polyxml-core)
+    Finished `test` profile [unoptimized + debuginfo] target(s) in 1.08s
+     Running tests/test_mixed_nil.rs (/home/bailey/github/PolyXML/target/followup-borrow-verification/debug/deps/test_mixed_nil-1aec7ae934470d6f)
+
+running 2 tests
+test nil_scalar_and_nested_items_keep_order_and_differ_from_empty_strings ... FAILED
+test nil_instance_prefix_does_not_rebind_the_element_namespace ... FAILED
+
+failures:
+
+---- nil_scalar_and_nested_items_keep_order_and_differ_from_empty_strings stdout ----
+
+thread 'nil_scalar_and_nested_items_keep_order_and_differ_from_empty_strings' (503936) panicked at crates/polyxml-core/tests/test_mixed_nil.rs:41:63:
+called `Result::unwrap()` on an `Err` value: SerializationError("Invalid mixed content value for text")
+
+---- nil_instance_prefix_does_not_rebind_the_element_namespace stdout ----
+
+thread 'nil_instance_prefix_does_not_rebind_the_element_namespace' (503935) panicked at crates/polyxml-core/tests/test_mixed_nil.rs:61:10:
+called `Result::unwrap()` on an `Err` value: SerializationError("Invalid mixed content value for text")
+note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
+
+
+failures:
+    nil_instance_prefix_does_not_rebind_the_element_namespace
+    nil_scalar_and_nested_items_keep_order_and_differ_from_empty_strings
+
+test result: FAILED. 0 passed; 2 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+error: test failed, to rerun pass `-p polyxml --test test_mixed_nil`
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/polyxml-branch-allocations.py.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/polyxml-branch-allocations.py.txt
new file mode 100644
index 0000000..f8696e7
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/polyxml-branch-allocations.py.txt
@@ -0,0 +1,29 @@
+from pathlib import Path
+import json,os,subprocess,shutil,sys
+root=Path('/home/bailey/github/PolyXML');repo=Path(sys.argv[1]).resolve();label=sys.argv[2];out=Path(sys.argv[3]);out.mkdir(parents=True,exist_ok=True)
+crate=root/'benchmarks/rust-runtime-investigation/target'/('branch-allocations-'+label);(crate/'src').mkdir(parents=True,exist_ok=True)
+source=Path('/home/bailey/github/polyxml-mixed-index/benchmarks/rust-runtime-investigation/mixed_branches.rs').read_text()
+fixture=source[source.index('fn fixture('):source.index('fn benchmarks(')]
+allocator=(root/'benchmarks/rust-runtime-investigation/diagnostics.rs').read_text();allocator=allocator[allocator.index('use std::alloc'):allocator.index('fn main()')]
+harness='use polyxml::schema::ModelSchema;\nuse polyxml::schema_parser::XsdParser;\nuse polyxml::{deserialize,serialize,PolyValue};\nuse std::{hint::black_box,sync::Arc};\n'+allocator+fixture+r'''
+fn main() {
+ for branches in [1,16,64,256] { for count in [1,1000] {
+  let (schema,xml)=fixture(branches,count);
+  let value=deserialize(&xml,Arc::clone(&schema)).unwrap();
+  for _ in 0..3 { black_box(serialize("Root",&value,&schema,None).unwrap()); }
+  ALLOCATIONS.store(0,Ordering::Relaxed);REALLOCATIONS.store(0,Ordering::Relaxed);BYTES.store(0,Ordering::Relaxed);
+  COUNTING.store(true,Ordering::Relaxed);
+  let output=serialize("Root",&value,&schema,None).unwrap();
+  COUNTING.store(false,Ordering::Relaxed);
+  println!("branches={branches},items={count},allocations={},reallocations={},requested_bytes={},output_bytes={}",ALLOCATIONS.load(Ordering::Relaxed),REALLOCATIONS.load(Ordering::Relaxed),BYTES.load(Ordering::Relaxed),output.len());
+ } }
+}
+'''
+(crate/'src/main.rs').write_text(harness)
+(crate/'Cargo.toml').write_text('[package]\nname="branch-allocations"\nversion="0.0.0"\nedition="2021"\n[workspace]\n[dependencies]\npolyxml={path='+json.dumps(str(repo/'crates/polyxml-core'))+'}\n')
+shutil.copy2(root/'benchmarks/rust-runtime-investigation/target/selected/Cargo.lock',crate/'Cargo.lock')
+env=os.environ|{'CARGO_BUILD_JOBS':'1','POLYXML_MEMCAP_BACKEND':'systemd'}
+with (out/(label+'-build.txt')).open('w') as log:subprocess.run([str(root/'scripts/memcap.sh'),'cargo','build','--release','--manifest-path',str(crate/'Cargo.toml')],env=env,stdout=log,stderr=subprocess.STDOUT,check=True)
+for name,path in [('harness.rs',crate/'src/main.rs'),('Cargo.toml',crate/'Cargo.toml'),('Cargo.lock',crate/'Cargo.lock')]:shutil.copy2(path,out/(label+'-'+name))
+with (out/(label+'-allocations.txt')).open('w') as log:subprocess.run([str(root/'scripts/memcap.sh'),str(crate/'target/release/branch-allocations')],env=env,stdout=log,stderr=subprocess.STDOUT,check=True)
+(out/(label+'-metadata.json')).write_text(json.dumps({'revision':subprocess.check_output(['git','-C',str(repo),'rev-parse','HEAD'],text=True).strip(),'items':[1,1000],'branches':[1,16,64,256],'operations':1,'warmup_operations':3,'rustc':subprocess.check_output(['rustc','-Vv'],text=True)},indent=2)+'\n')
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/polyxml-mixed-index-verify-sampled.sh.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/polyxml-mixed-index-verify-sampled.sh.txt
new file mode 100644
index 0000000..857abf5
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/polyxml-mixed-index-verify-sampled.sh.txt
@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+set -euo pipefail
+cd /home/bailey/github/polyxml-mixed-index
+export POLYXML_MEMCAP_BACKEND=systemd CARGO_BUILD_JOBS=1 DOTNET_ROLL_FORWARD=Major
+export PATH=/tmp/polyxml-corpus-tools/node_modules/.bin:$PATH
+root=/home/bailey/github/PolyXML
+ln -s "$root/benchmarks/rust-xml-regression/target" benchmarks/rust-xml-regression/target
+python3 benchmarks/rust-xml-regression/run_core.py --baseline ../polyxml-perf-selected --harness /tmp/polyxml-mixed-branch-concentrated.rs --output "$root/benchmarks/rust-runtime-investigation/target/evidence/mixed-branch-index-concentrated-final-sampled" --rounds 2 --samples 50 --warmup 1 --measurement 2 --filter '^branch_write/'
+python3 benchmarks/rust-xml-regression/run_core.py --baseline ../polyxml-perf-selected --harness benchmarks/rust-runtime-investigation/mixed_branches.rs --output "$root/benchmarks/rust-runtime-investigation/target/evidence/mixed-branch-index-final-sampled" --rounds 3 --samples 100 --warmup 3 --measurement 5 --filter '^branch_write/.*/1000$'
+python3 benchmarks/rust-xml-regression/run_core.py --baseline ../polyxml-perf-selected --harness benchmarks/rust-runtime-investigation/mixed_branches.rs --output "$root/benchmarks/rust-runtime-investigation/target/evidence/mixed-branch-index-controls-sampled" --rounds 2 --samples 50 --warmup 1 --measurement 2 --filter '^branch_read/.*/(1|1000)$|^branch_write/.*/1$'
+python3 benchmarks/rust-xml-regression/run_core.py --baseline ../polyxml-perf-selected --harness benchmarks/rust-runtime-investigation/mixed.rs --output "$root/benchmarks/rust-runtime-investigation/target/evidence/mixed-branch-index-common-sampled" --rounds 3 --samples 100 --warmup 3 --measurement 5 --filter '^mixed_write/'
+python3 benchmarks/rust-xml-regression/run_core.py --baseline ../polyxml-perf-selected --output "$root/benchmarks/rust-runtime-investigation/target/evidence/mixed-branch-index-core-sampled" --rounds 2 --samples 50 --warmup 1 --measurement 2
+unlink benchmarks/rust-xml-regression/target
+python3 /tmp/polyxml-branch-allocations.py ../polyxml-perf-selected baseline "$root/benchmarks/rust-runtime-investigation/target/evidence/mixed-branch-index-allocations-sampled"
+python3 /tmp/polyxml-branch-allocations.py . current "$root/benchmarks/rust-runtime-investigation/target/evidence/mixed-branch-index-allocations-sampled"
+export CARGO_TARGET_DIR="$root/target/followup-mixed-index-verification"
+ln -s "$CARGO_TARGET_DIR" target
+ln -s "$root/.venv" .venv
+scripts/memcap.sh scripts/gate.sh > /tmp/polyxml-mixed-index-gate-sampled.log 2>&1
+unlink target
+unlink .venv
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/polyxml-mixed-index-verify.sh.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/polyxml-mixed-index-verify.sh.txt
new file mode 100644
index 0000000..c8f651a
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/polyxml-mixed-index-verify.sh.txt
@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+set -euo pipefail
+cd /home/bailey/github/polyxml-mixed-index
+export POLYXML_MEMCAP_BACKEND=systemd CARGO_BUILD_JOBS=1 DOTNET_ROLL_FORWARD=Major
+export PATH=/tmp/polyxml-corpus-tools/node_modules/.bin:$PATH
+root=/home/bailey/github/PolyXML
+ln -s "$root/benchmarks/rust-xml-regression/target" benchmarks/rust-xml-regression/target
+python3 benchmarks/rust-xml-regression/run_core.py --baseline ../polyxml-perf-selected --harness benchmarks/rust-runtime-investigation/mixed_branches.rs --output "$root/benchmarks/rust-runtime-investigation/target/evidence/mixed-branch-index-final" --rounds 3 --samples 100 --warmup 3 --measurement 5 --filter '^branch_write/.*/1000$'
+python3 benchmarks/rust-xml-regression/run_core.py --baseline ../polyxml-perf-selected --harness benchmarks/rust-runtime-investigation/mixed_branches.rs --output "$root/benchmarks/rust-runtime-investigation/target/evidence/mixed-branch-index-controls" --rounds 2 --samples 50 --warmup 1 --measurement 2 --filter '^branch_read/|^branch_write/.*/1$'
+python3 benchmarks/rust-xml-regression/run_core.py --baseline ../polyxml-perf-selected --harness benchmarks/rust-runtime-investigation/mixed.rs --output "$root/benchmarks/rust-runtime-investigation/target/evidence/mixed-branch-index-common" --rounds 3 --samples 100 --warmup 3 --measurement 5 --filter '^mixed_write/'
+python3 benchmarks/rust-xml-regression/run_core.py --baseline ../polyxml-perf-selected --output "$root/benchmarks/rust-runtime-investigation/target/evidence/mixed-branch-index-core" --rounds 2 --samples 50 --warmup 1 --measurement 2
+unlink benchmarks/rust-xml-regression/target
+python3 /tmp/polyxml-branch-allocations.py ../polyxml-perf-selected baseline "$root/benchmarks/rust-runtime-investigation/target/evidence/mixed-branch-index-allocations"
+python3 /tmp/polyxml-branch-allocations.py . current "$root/benchmarks/rust-runtime-investigation/target/evidence/mixed-branch-index-allocations"
+export CARGO_TARGET_DIR="$root/target/followup-mixed-index-verification"
+ln -s "$CARGO_TARGET_DIR" target
+ln -s "$root/.venv" .venv
+scripts/memcap.sh scripts/gate.sh > /tmp/polyxml-mixed-index-gate.log 2>&1
+unlink target
+unlink .venv
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/polyxml-profile-mixed.py.txt b/research/data/runtime-followups-2026-10-03/mixed-writer/polyxml-profile-mixed.py.txt
new file mode 100644
index 0000000..c4f3dd9
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/polyxml-profile-mixed.py.txt
@@ -0,0 +1,41 @@
+from pathlib import Path
+import json,os,subprocess,shutil,sys
+root=Path('/home/bailey/github/PolyXML')
+repo=Path(sys.argv[1]).resolve();label=sys.argv[2];out=Path(sys.argv[3]);out.mkdir(parents=True,exist_ok=True)
+crate=root/'benchmarks/rust-runtime-investigation/target'/('mixed-profile-'+label);(crate/'src').mkdir(parents=True,exist_ok=True)
+source=Path('/home/bailey/github/polyxml-mixed-nil/benchmarks/rust-runtime-investigation/mixed.rs').read_text()
+fixture=source[source.index('fn fixture('):source.index('fn benchmarks(')]
+harness='use polyxml::schema::ModelSchema;\nuse polyxml::schema_parser::XsdParser;\nuse polyxml::{deserialize, serialize, PolyValue};\nuse std::{hint::black_box,sync::Arc};\n'+fixture+r'''
+#[inline(never)]
+#[no_mangle]
+fn measured_region(schema: &ModelSchema, value: &PolyValue, count: usize) {
+ for _ in 0..count { black_box(serialize("Root", black_box(value), black_box(schema), None).unwrap()); }
+}
+fn main() {
+ let kind=std::env::args().nth(1).unwrap();
+ let (schema,xml)=fixture(&kind,1000);
+ let value=deserialize(&xml,Arc::clone(&schema)).unwrap();
+ for _ in 0..3 { black_box(serialize("Root", &value, &schema,None).unwrap()); }
+ measured_region(&schema,&value,25);
+}
+'''
+(crate/'src/main.rs').write_text(harness)
+(crate/'Cargo.toml').write_text('[package]\nname="mixed-profile"\nversion="0.0.0"\nedition="2021"\n[workspace]\n[dependencies]\npolyxml={path='+json.dumps(str(repo/'crates/polyxml-core'))+'}\n[profile.release]\ndebug=1\n')
+shutil.copy2(root/'benchmarks/rust-runtime-investigation/target/selected/Cargo.lock',crate/'Cargo.lock')
+env=os.environ|{'CARGO_BUILD_JOBS':'1','POLYXML_MEMCAP_BACKEND':'systemd'}
+with (out/(label+'-build.txt')).open('w') as log:
+ subprocess.run([str(root/'scripts/memcap.sh'),'cargo','build','--release','--manifest-path',str(crate/'Cargo.toml')],env=env,stdout=log,stderr=subprocess.STDOUT,check=True)
+for name,path in [('harness.rs',crate/'src/main.rs'),('Cargo.toml',crate/'Cargo.toml'),('Cargo.lock',crate/'Cargo.lock')]:shutil.copy2(path,out/(label+'-'+name))
+(out/(label+'-metadata.json')).write_text(json.dumps({'revision':subprocess.check_output(['git','-C',str(repo),'rev-parse','HEAD'],text=True).strip(),'kind':['scalar','pattern'],'items':1000,'operations':25,'warmup_operations':3,'rustc':subprocess.check_output(['rustc','-Vv'],text=True)},indent=2)+'\n')
+tools=root/'benchmarks/rust-runtime-investigation/target/tools/root/usr'
+env['VALGRIND_LIB']=str(tools/'libexec/valgrind')
+for kind in ['scalar','pattern']:
+ subprocess.run([str(root/'scripts/memcap.sh'),str(tools/'bin/valgrind'),'--tool=callgrind','--collect-atstart=no','--toggle-collect=measured_region','--callgrind-out-file='+str(out/(label+'-'+kind+'.callgrind')),'--log-file='+str(out/(label+'-'+kind+'-valgrind.txt')),'--error-exitcode=93',str(crate/'target/release/mixed-profile'),kind],env=env,check=True)
+ with (out/(label+'-'+kind+'-annotated.txt')).open('w') as log:
+  subprocess.run([str(tools/'bin/callgrind_annotate'),'--auto=no','--inclusive=no','--threshold=95',str(out/(label+'-'+kind+'.callgrind'))],env=env,stdout=log,check=True)
+
+for kind in ["scalar", "pattern"]:
+ text=(out/(label+"-"+kind+"-valgrind.txt")).read_text()
+ import re
+ match=re.search(r"Collected :\s*([\d,]+)",text)
+ assert match and int(match.group(1).replace(",","")) > 0, "measurement marker collected no instructions"
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/sampled-selector.patch b/research/data/runtime-followups-2026-10-03/mixed-writer/sampled-selector.patch
new file mode 100644
index 0000000..305a444
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/sampled-selector.patch
@@ -0,0 +1,539 @@
+diff --git a/crates/polyxml-core/src/serializer.rs b/crates/polyxml-core/src/serializer.rs
+index f68ba99..f6de2f4 100644
+--- a/crates/polyxml-core/src/serializer.rs
++++ b/crates/polyxml-core/src/serializer.rs
+@@ -523,93 +523,7 @@ impl XmlSerializer {
+             if let Some(PolyValue::List(items)) =
+                 get_field(mixed.items_index, &schema.fields[mixed.items_index].name)
+             {
+-                for item in items {
+-                    let tagged_field = |name: &str| -> Option<&PolyValue> {
+-                        match item {
+-                            PolyValue::Object(tagged) => tagged.get(name),
+-                            PolyValue::Record { schema, values } => schema
+-                                .fields
+-                                .iter()
+-                                .position(|field| field.name == name)
+-                                .and_then(|idx| values.get(idx))
+-                                .and_then(Option::as_ref),
+-                            _ => None,
+-                        }
+-                    };
+-                    let Some(kind) = tagged_field("kind").and_then(PolyValue::as_str) else {
+-                        return Err(PolyXmlError::SerializationError(
+-                            "Mixed content item has no kind".into(),
+-                        ));
+-                    };
+-                    let Some(content) = tagged_field("value") else {
+-                        return Err(PolyXmlError::SerializationError(
+-                            "Mixed content item has no value".into(),
+-                        ));
+-                    };
+-                    if kind == "#text" {
+-                        let Some(text) = content.as_str() else {
+-                            return Err(PolyXmlError::SerializationError(
+-                                "Mixed text item must be a string".into(),
+-                            ));
+-                        };
+-                        writer
+-                            .write_event(Event::Text(BytesText::new(text)))
+-                            .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
+-                        continue;
+-                    }
+-                    let Some(branch) = mixed
+-                        .branches
+-                        .iter()
+-                        .find(|branch| branch.variant_name == kind)
+-                    else {
+-                        return Err(PolyXmlError::SerializationError(format!(
+-                            "Unknown mixed content kind: {kind}"
+-                        )));
+-                    };
+-                    let local_name = std::str::from_utf8(&branch.xml_name)?;
+-                    let qualified = if let Some(ctx) = ns_ctx {
+-                        ctx.qualify_element(
+-                            local_name,
+-                            branch.namespace.as_deref().or(schema.namespace.as_deref()),
+-                        )
+-                    } else {
+-                        Cow::Borrowed(local_name)
+-                    };
+-                    match &branch.val_type {
+-                        ValueType::Scalar(_) => {
+-                            let mut buf = [0u8; lexical_core::BUFFER_SIZE];
+-                            let Some(text) = Self::format_scalar_to(content, &mut buf) else {
+-                                return Err(PolyXmlError::SerializationError(format!(
+-                                    "Invalid mixed content value for {kind}"
+-                                )));
+-                            };
+-                            Self::validate_scalar(&branch.val_type, &text, kind)?;
+-                            writer
+-                                .write_event(Event::Start(BytesStart::new(qualified.as_ref())))
+-                                .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
+-                            writer
+-                                .write_event(Event::Text(BytesText::new(&text)))
+-                                .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
+-                            writer
+-                                .write_event(Event::End(BytesEnd::new(qualified.as_ref())))
+-                                .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
+-                        }
+-                        ValueType::Nested(nested) => Self::write_model(
+-                            writer,
+-                            &branch.xml_name,
+-                            content,
+-                            nested,
+-                            ns_ctx,
+-                            false,
+-                            branch.namespace.as_deref().or(nested.namespace.as_deref()),
+-                        )?,
+-                        ValueType::List(_) => {
+-                            return Err(PolyXmlError::SerializationError(
+-                                "Nested lists are invalid mixed content branches".into(),
+-                            ))
+-                        }
+-                    }
+-                }
++                Self::write_mixed_items(writer, items, schema, mixed, ns_ctx)?;
+             }
+         } else {
+             for (idx, field) in schema.fields.iter().enumerate() {
+@@ -759,6 +673,198 @@ impl XmlSerializer {
+         Ok(())
+     }
+ 
++    fn write_mixed_items<W: std::io::Write>(
++        writer: &mut Writer<W>,
++        items: &[PolyValue],
++        schema: &ModelSchema,
++        mixed: &crate::schema::MixedContentSchema,
++        ns_ctx: Option<&NamespaceContext>,
++    ) -> Result<()> {
++        // Amortize the temporary index only for sufficiently large schemas and
++        // repeated payloads. References avoid cloning keys or branch metadata.
++        if mixed.branches.len() >= 64
++            && items.len() >= 64
++            && items.len() >= mixed.branches.len().div_ceil(2)
++            && Self::mixed_lookup_sample_favors_index(items, mixed)
++        {
++            let mut index = std::collections::HashMap::with_capacity(mixed.branches.len());
++            for branch in &mixed.branches {
++                // Preserve the linear lookup's first-match behavior for public
++                // metadata containing duplicate variant names.
++                index.entry(branch.variant_name.as_str()).or_insert(branch);
++            }
++            Self::write_mixed_items_using(writer, items, schema, ns_ctx, |kind| {
++                index.get(kind).copied()
++            })
++        } else {
++            Self::write_mixed_items_using(writer, items, schema, ns_ctx, |kind| {
++                mixed
++                    .branches
++                    .iter()
++                    .find(|branch| branch.variant_name == kind)
++            })
++        }
++    }
++
++    fn mixed_lookup_sample_favors_index(
++        items: &[PolyValue],
++        mixed: &crate::schema::MixedContentSchema,
++    ) -> bool {
++        // Spread a bounded sample across the payload. Early-branch reuse and
++        // text-only items otherwise pay for an index that saves little work.
++        let stride = items.len() / 16;
++        let mut tagged = 0;
++        let mut comparisons = 0;
++        for sample in 0..16 {
++            // Offset within each bin to avoid sampling the same tag when a
++            // repeated choice cycle divides the stride exactly.
++            let offset = (sample * 17 + 7) % stride;
++            let Some(kind) = items[sample * stride + offset]
++                .get("kind")
++                .and_then(PolyValue::as_str)
++            else {
++                continue;
++            };
++            if kind == "#text" {
++                continue;
++            }
++            if let Some(position) = mixed
++                .branches
++                .iter()
++                .position(|branch| branch.variant_name == kind)
++            {
++                tagged += 1;
++                comparisons += position + 1;
++            }
++        }
++        tagged >= 4 && comparisons >= tagged * 16
++    }
++
++    #[inline(never)]
++    fn write_mixed_items_using<'a, W: std::io::Write, F>(
++        writer: &mut Writer<W>,
++        items: &[PolyValue],
++        schema: &ModelSchema,
++        ns_ctx: Option<&NamespaceContext>,
++        lookup: F,
++    ) -> Result<()>
++    where
++        F: Fn(&str) -> Option<&'a crate::schema::MixedBranchSchema>,
++    {
++        for item in items {
++            let tagged_field = |name: &str| -> Option<&PolyValue> {
++                match item {
++                    PolyValue::Object(tagged) => tagged.get(name),
++                    PolyValue::Record { schema, values } => schema
++                        .fields
++                        .iter()
++                        .position(|field| field.name == name)
++                        .and_then(|idx| values.get(idx))
++                        .and_then(Option::as_ref),
++                    _ => None,
++                }
++            };
++            let Some(kind) = tagged_field("kind").and_then(PolyValue::as_str) else {
++                return Err(PolyXmlError::SerializationError(
++                    "Mixed content item has no kind".into(),
++                ));
++            };
++            let Some(content) = tagged_field("value") else {
++                return Err(PolyXmlError::SerializationError(
++                    "Mixed content item has no value".into(),
++                ));
++            };
++            if kind == "#text" {
++                let Some(text) = content.as_str() else {
++                    return Err(PolyXmlError::SerializationError(
++                        "Mixed text item must be a string".into(),
++                    ));
++                };
++                writer
++                    .write_event(Event::Text(BytesText::new(text)))
++                    .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
++                continue;
++            }
++            let Some(branch) = lookup(kind) else {
++                return Err(PolyXmlError::SerializationError(format!(
++                    "Unknown mixed content kind: {kind}"
++                )));
++            };
++            let local_name = std::str::from_utf8(&branch.xml_name)?;
++            let qualified = if let Some(ctx) = ns_ctx {
++                ctx.qualify_element(
++                    local_name,
++                    branch.namespace.as_deref().or(schema.namespace.as_deref()),
++                )
++            } else {
++                Cow::Borrowed(local_name)
++            };
++            match &branch.val_type {
++                ValueType::Scalar(_) => {
++                    let mut buf = [0u8; lexical_core::BUFFER_SIZE];
++                    let Some(text) = Self::format_scalar_to(content, &mut buf) else {
++                        if content.is_null() {
++                            Self::write_mixed_nil(writer, qualified.as_ref())?;
++                            continue;
++                        }
++                        return Err(PolyXmlError::SerializationError(format!(
++                            "Invalid mixed content value for {kind}"
++                        )));
++                    };
++                    Self::validate_scalar(&branch.val_type, &text, kind)?;
++                    writer
++                        .write_event(Event::Start(BytesStart::new(qualified.as_ref())))
++                        .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
++                    writer
++                        .write_event(Event::Text(BytesText::new(&text)))
++                        .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
++                    writer
++                        .write_event(Event::End(BytesEnd::new(qualified.as_ref())))
++                        .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
++                }
++                ValueType::Nested(nested) => {
++                    if content.is_null() {
++                        Self::write_mixed_nil(writer, qualified.as_ref())?;
++                    } else {
++                        Self::write_model(
++                            writer,
++                            &branch.xml_name,
++                            content,
++                            nested,
++                            ns_ctx,
++                            false,
++                            branch.namespace.as_deref().or(nested.namespace.as_deref()),
++                        )?;
++                    }
++                }
++                ValueType::List(_) => {
++                    return Err(PolyXmlError::SerializationError(
++                        "Nested lists are invalid mixed content branches".into(),
++                    ))
++                }
++            }
++        }
++        Ok(())
++    }
++
++    // A tagged null is a present nil element, unlike an absent ordinary field.
++    // Bind the instance prefix locally without shadowing the element's QName.
++    // Scalar callers reach this through their existing failed-format path.
++    #[cold]
++    fn write_mixed_nil<W: std::io::Write>(writer: &mut Writer<W>, qualified: &str) -> Result<()> {
++        let (declaration, attribute) = if qualified.starts_with("xsi:") {
++            ("xmlns:xsi1", "xsi1:nil")
++        } else {
++            ("xmlns:xsi", "xsi:nil")
++        };
++        let mut element = BytesStart::new(qualified);
++        element.push_attribute((declaration, XSI_NS));
++        element.push_attribute((attribute, "true"));
++        writer
++            .write_event(Event::Empty(element))
++            .map_err(|error| PolyXmlError::SerializationError(error.to_string()))
++    }
++
+     fn write_any_wildcard_element<W: std::io::Write>(
+         writer: &mut quick_xml::Writer<W>,
+         val: &PolyValue,
+diff --git a/crates/polyxml-core/tests/test_mixed_branch_lookup.rs b/crates/polyxml-core/tests/test_mixed_branch_lookup.rs
+new file mode 100644
+index 0000000..52996dc
+--- /dev/null
++++ b/crates/polyxml-core/tests/test_mixed_branch_lookup.rs
+@@ -0,0 +1,122 @@
++use polyxml::schema::{FieldKind, FieldSchema, ModelSchema, ScalarType, ValueType};
++use polyxml::schema_parser::XsdParser;
++use polyxml::{deserialize, serialize, PolyValue};
++use std::{collections::HashMap, sync::Arc};
++
++fn tagged(kind: &str, value: PolyValue) -> PolyValue {
++    PolyValue::Object(HashMap::from([
++        ("kind".into(), PolyValue::String(kind.into())),
++        ("value".into(), value),
++    ]))
++}
++
++#[test]
++fn large_mixed_tables_keep_first_match_metadata_edits_records_and_nil() {
++    let declarations = (0..64)
++        .map(|i| format!(r#"<xs:element name="B{i}" type="xs:int"/>"#))
++        .collect::<String>();
++    let xsd = format!(
++        r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"><xs:element name="Root"><xs:complexType mixed="true"><xs:choice minOccurs="0" maxOccurs="unbounded">{declarations}</xs:choice></xs:complexType></xs:element></xs:schema>"#
++    );
++    let ir = XsdParser::new().parse_str(&xsd).unwrap();
++    let mut schema = ModelSchema::from_ir(&ir, Some("Root")).unwrap();
++    let mixed = schema.mixed_content.as_ref().unwrap();
++    let items_name = schema.fields[mixed.items_index].name.clone();
++    let kinds = (0..64)
++        .map(|i| {
++            mixed
++                .branches
++                .iter()
++                .find(|b| b.xml_name == format!("B{i}").as_bytes())
++                .unwrap()
++                .variant_name
++                .clone()
++        })
++        .collect::<Vec<_>>();
++    let first_index = mixed
++        .branches
++        .iter()
++        .position(|b| b.xml_name == b"B0")
++        .unwrap();
++    let old_kind = kinds[0].clone();
++    let record_schema = ModelSchema::builder("Tagged")
++        .field(FieldSchema::new(
++            "value",
++            b"value",
++            FieldKind::Element,
++            ValueType::Scalar(ScalarType::Int),
++        ))
++        .field(FieldSchema::new(
++            "kind",
++            b"kind",
++            FieldKind::Element,
++            ValueType::Scalar(ScalarType::String),
++        ))
++        .build();
++    let mut items = (0..256)
++        .map(|i| tagged(&kinds[i % 64], PolyValue::Int(i as i64)))
++        .collect::<Vec<_>>();
++    items[0] = PolyValue::Record {
++        schema: record_schema,
++        values: vec![
++            Some(PolyValue::Int(0)),
++            Some(PolyValue::String(old_kind.clone())),
++        ]
++        .into_boxed_slice(),
++    };
++    items.push(tagged(&kinds[63], PolyValue::Null));
++    let mut value = PolyValue::Object(HashMap::from([(
++        items_name.clone(),
++        PolyValue::List(items),
++    )]));
++    {
++        let mixed = Arc::get_mut(&mut schema)
++            .unwrap()
++            .mixed_content
++            .as_mut()
++            .unwrap();
++        let mut duplicate = mixed.branches[first_index].clone();
++        duplicate.xml_name = b"Duplicate".to_vec();
++        mixed.branches.push(duplicate);
++    }
++    let output = serialize("Root", &value, &schema, None).unwrap();
++    assert!(std::str::from_utf8(&output).unwrap().contains("<B0>0</B0>"));
++    assert!(!std::str::from_utf8(&output).unwrap().contains("<Duplicate"));
++    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
++    Arc::get_mut(&mut schema)
++        .unwrap()
++        .mixed_content
++        .as_mut()
++        .unwrap()
++        .branches[first_index]
++        .variant_name = "changed_kind".into();
++    let PolyValue::Object(root) = &mut value else {
++        unreachable!()
++    };
++    let PolyValue::List(items) = root.get_mut(&items_name).unwrap() else {
++        unreachable!()
++    };
++    for item in items.iter_mut() {
++        if item.get("kind").and_then(PolyValue::as_str) == Some(old_kind.as_str()) {
++            match item {
++                PolyValue::Object(fields) => {
++                    fields.insert("kind".into(), PolyValue::String("changed_kind".into()));
++                }
++                PolyValue::Record { values, .. } => {
++                    values[1] = Some(PolyValue::String("changed_kind".into()))
++                }
++                _ => unreachable!(),
++            }
++        }
++    }
++    let output = serialize("Root", &value, &schema, None).unwrap();
++    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
++    let PolyValue::Object(root) = &mut value else {
++        unreachable!()
++    };
++    let PolyValue::List(items) = root.get_mut(&items_name).unwrap() else {
++        unreachable!()
++    };
++    items[0] = tagged("unregistered", PolyValue::Int(0));
++    assert!(serialize("Root", &value, &schema, None).is_err());
++}
+diff --git a/crates/polyxml-core/tests/test_mixed_nil.rs b/crates/polyxml-core/tests/test_mixed_nil.rs
+new file mode 100644
+index 0000000..95cc765
+--- /dev/null
++++ b/crates/polyxml-core/tests/test_mixed_nil.rs
+@@ -0,0 +1,93 @@
++use std::collections::HashMap;
++use std::sync::Arc;
++
++use polyxml::schema::ModelSchema;
++use polyxml::schema_parser::XsdParser;
++use polyxml::serializer::XmlSerializer;
++use polyxml::{deserialize, serialize, PolyValue};
++
++fn schema(namespace: Option<&str>) -> Arc<ModelSchema> {
++    let declaration = namespace
++        .map(|ns| format!("targetNamespace='{ns}' xmlns:t='{ns}' elementFormDefault='qualified'"))
++        .unwrap_or_default();
++    let xsd = format!("<xs:schema xmlns:xs='http://www.w3.org/2001/XMLSchema' {declaration}>
++      <xs:element name='Root'><xs:complexType mixed='true'><xs:choice minOccurs='0' maxOccurs='unbounded'>
++        <xs:element name='Text' type='xs:string' nillable='true'/>
++        <xs:element name='Number' type='xs:int' nillable='true'/>
++        <xs:element name='Child' nillable='true'><xs:complexType><xs:sequence>
++          <xs:element name='Value' type='xs:string'/>
++        </xs:sequence></xs:complexType></xs:element>
++      </xs:choice></xs:complexType></xs:element></xs:schema>");
++    let ir = XsdParser::new().parse_str(&xsd).unwrap();
++    ModelSchema::from_ir(&ir, Some("Root")).unwrap()
++}
++
++#[test]
++fn nil_scalar_and_nested_items_keep_order_and_differ_from_empty_strings() {
++    let schema = schema(None);
++    for nil in [
++        "<Text i:nil='true'/>",
++        "<Text i:nil='1'></Text>",
++        "<Number i:nil='true'/>",
++        "<Child i:nil='true'/>",
++    ] {
++        let xml = format!("<Root xmlns:i='http://www.w3.org/2001/XMLSchema-instance'>before{nil}<Text/><Child><Value>nested</Value></Child>{nil}<Text>after</Text></Root>");
++        let value = deserialize(xml.as_bytes(), Arc::clone(&schema)).unwrap();
++        let items_field = &schema.fields[schema.mixed_content.as_ref().unwrap().items_index].name;
++        let items = value.get(items_field).and_then(PolyValue::as_list).unwrap();
++        assert!(items[1].get("value").unwrap().is_null());
++        assert_eq!(items[2].get("value").and_then(PolyValue::as_str), Some(""));
++        assert!(items[4].get("value").unwrap().is_null());
++        let output = serialize("Root", &value, &schema, None).unwrap();
++        assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
++    }
++}
++
++#[test]
++fn nil_instance_prefix_does_not_rebind_the_element_namespace() {
++    let schema = schema(Some("urn:document"));
++    let xml = b"<Root xmlns='urn:document' xmlns:i='http://www.w3.org/2001/XMLSchema-instance'><Text i:nil='true'/><Number i:nil='true'/><Child i:nil='true'/><Text>after</Text></Root>";
++    let value = deserialize(xml, Arc::clone(&schema)).unwrap();
++    for prefix in ["", "doc", "xsi", "xsi1"] {
++        let ns_map = HashMap::from([(prefix.to_owned(), "urn:document".to_owned())]);
++        let output = XmlSerializer::serialize_with_options(
++            "Root",
++            &value,
++            &schema,
++            None,
++            Some(true),
++            Some(&ns_map),
++        )
++        .unwrap();
++        let mut reader = quick_xml::NsReader::from_reader(output.as_slice());
++        let mut nils = 0;
++        loop {
++            let (namespace, event) = reader.read_resolved_event().unwrap();
++            match event {
++                quick_xml::events::Event::Empty(element) => {
++                    assert!(
++                        matches!(namespace, quick_xml::name::ResolveResult::Bound(uri) if uri.as_ref() == "urn:document")
++                    );
++                    for attribute in element.attributes() {
++                        let attribute = attribute.unwrap();
++                        if attribute.key.local_name().as_ref() == "nil" {
++                            let (namespace, _) = reader.resolver().resolve_attribute(attribute.key);
++                            assert!(
++                                matches!(namespace, quick_xml::name::ResolveResult::Bound(uri) if uri.as_ref() == "http://www.w3.org/2001/XMLSchema-instance")
++                            );
++                            nils += 1;
++                        }
++                    }
++                }
++                quick_xml::events::Event::Eof => break,
++                _ => {}
++            }
++        }
++        assert_eq!(nils, 3);
++        assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
++    }
++    let output =
++        XmlSerializer::serialize_with_options("Root", &value, &schema, None, Some(false), None)
++            .unwrap();
++    assert_eq!(value, deserialize(&output, schema).unwrap());
++}
+diff --git a/crates/polyxml-core/tests/test_runtime_fast_paths.rs b/crates/polyxml-core/tests/test_runtime_fast_paths.rs
+index c0f13f1..07aa439 100644
+--- a/crates/polyxml-core/tests/test_runtime_fast_paths.rs
++++ b/crates/polyxml-core/tests/test_runtime_fast_paths.rs
+@@ -239,6 +239,8 @@ fn unified_scalar_state_keeps_mixed_branch_order_nil_and_nested_frames() {
+         assert_eq!(value,deserialize(&output,Arc::clone(&schema)).unwrap());
+     }
+     let nil_document = b"<Root xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'><Text xsi:nil='true'/><State>Ready</State></Root>";
+-    assert!(deserialize(nil_document, Arc::clone(&schema)).is_ok());
++    let value = deserialize(nil_document, Arc::clone(&schema)).unwrap();
++    let output = serialize("Root", &value, &schema, None).unwrap();
++    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+     assert!(deserialize(b"<Root><State>invalid</State></Root>", schema).is_err());
+ }
diff --git a/research/data/runtime-followups-2026-10-03/mixed-writer/scaled-trigger.patch b/research/data/runtime-followups-2026-10-03/mixed-writer/scaled-trigger.patch
new file mode 100644
index 0000000..2fa01e9
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/mixed-writer/scaled-trigger.patch
@@ -0,0 +1,504 @@
+diff --git a/crates/polyxml-core/src/serializer.rs b/crates/polyxml-core/src/serializer.rs
+index f68ba99..1f461bf 100644
+--- a/crates/polyxml-core/src/serializer.rs
++++ b/crates/polyxml-core/src/serializer.rs
+@@ -523,93 +523,7 @@ impl XmlSerializer {
+             if let Some(PolyValue::List(items)) =
+                 get_field(mixed.items_index, &schema.fields[mixed.items_index].name)
+             {
+-                for item in items {
+-                    let tagged_field = |name: &str| -> Option<&PolyValue> {
+-                        match item {
+-                            PolyValue::Object(tagged) => tagged.get(name),
+-                            PolyValue::Record { schema, values } => schema
+-                                .fields
+-                                .iter()
+-                                .position(|field| field.name == name)
+-                                .and_then(|idx| values.get(idx))
+-                                .and_then(Option::as_ref),
+-                            _ => None,
+-                        }
+-                    };
+-                    let Some(kind) = tagged_field("kind").and_then(PolyValue::as_str) else {
+-                        return Err(PolyXmlError::SerializationError(
+-                            "Mixed content item has no kind".into(),
+-                        ));
+-                    };
+-                    let Some(content) = tagged_field("value") else {
+-                        return Err(PolyXmlError::SerializationError(
+-                            "Mixed content item has no value".into(),
+-                        ));
+-                    };
+-                    if kind == "#text" {
+-                        let Some(text) = content.as_str() else {
+-                            return Err(PolyXmlError::SerializationError(
+-                                "Mixed text item must be a string".into(),
+-                            ));
+-                        };
+-                        writer
+-                            .write_event(Event::Text(BytesText::new(text)))
+-                            .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
+-                        continue;
+-                    }
+-                    let Some(branch) = mixed
+-                        .branches
+-                        .iter()
+-                        .find(|branch| branch.variant_name == kind)
+-                    else {
+-                        return Err(PolyXmlError::SerializationError(format!(
+-                            "Unknown mixed content kind: {kind}"
+-                        )));
+-                    };
+-                    let local_name = std::str::from_utf8(&branch.xml_name)?;
+-                    let qualified = if let Some(ctx) = ns_ctx {
+-                        ctx.qualify_element(
+-                            local_name,
+-                            branch.namespace.as_deref().or(schema.namespace.as_deref()),
+-                        )
+-                    } else {
+-                        Cow::Borrowed(local_name)
+-                    };
+-                    match &branch.val_type {
+-                        ValueType::Scalar(_) => {
+-                            let mut buf = [0u8; lexical_core::BUFFER_SIZE];
+-                            let Some(text) = Self::format_scalar_to(content, &mut buf) else {
+-                                return Err(PolyXmlError::SerializationError(format!(
+-                                    "Invalid mixed content value for {kind}"
+-                                )));
+-                            };
+-                            Self::validate_scalar(&branch.val_type, &text, kind)?;
+-                            writer
+-                                .write_event(Event::Start(BytesStart::new(qualified.as_ref())))
+-                                .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
+-                            writer
+-                                .write_event(Event::Text(BytesText::new(&text)))
+-                                .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
+-                            writer
+-                                .write_event(Event::End(BytesEnd::new(qualified.as_ref())))
+-                                .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
+-                        }
+-                        ValueType::Nested(nested) => Self::write_model(
+-                            writer,
+-                            &branch.xml_name,
+-                            content,
+-                            nested,
+-                            ns_ctx,
+-                            false,
+-                            branch.namespace.as_deref().or(nested.namespace.as_deref()),
+-                        )?,
+-                        ValueType::List(_) => {
+-                            return Err(PolyXmlError::SerializationError(
+-                                "Nested lists are invalid mixed content branches".into(),
+-                            ))
+-                        }
+-                    }
+-                }
++                Self::write_mixed_items(writer, items, schema, mixed, ns_ctx)?;
+             }
+         } else {
+             for (idx, field) in schema.fields.iter().enumerate() {
+@@ -759,6 +673,163 @@ impl XmlSerializer {
+         Ok(())
+     }
+ 
++    fn write_mixed_items<W: std::io::Write>(
++        writer: &mut Writer<W>,
++        items: &[PolyValue],
++        schema: &ModelSchema,
++        mixed: &crate::schema::MixedContentSchema,
++        ns_ctx: Option<&NamespaceContext>,
++    ) -> Result<()> {
++        // Amortize the temporary index only for sufficiently large schemas and
++        // repeated payloads. References avoid cloning keys or branch metadata.
++        if mixed.branches.len() >= 64
++            && items.len() >= 64
++            && items.len() >= mixed.branches.len().div_ceil(2)
++        {
++            let mut index = std::collections::HashMap::with_capacity(mixed.branches.len());
++            for branch in &mixed.branches {
++                // Preserve the linear lookup's first-match behavior for public
++                // metadata containing duplicate variant names.
++                index.entry(branch.variant_name.as_str()).or_insert(branch);
++            }
++            Self::write_mixed_items_using(writer, items, schema, ns_ctx, |kind| {
++                index.get(kind).copied()
++            })
++        } else {
++            Self::write_mixed_items_using(writer, items, schema, ns_ctx, |kind| {
++                mixed
++                    .branches
++                    .iter()
++                    .find(|branch| branch.variant_name == kind)
++            })
++        }
++    }
++
++    #[inline(never)]
++    fn write_mixed_items_using<'a, W: std::io::Write, F>(
++        writer: &mut Writer<W>,
++        items: &[PolyValue],
++        schema: &ModelSchema,
++        ns_ctx: Option<&NamespaceContext>,
++        lookup: F,
++    ) -> Result<()>
++    where
++        F: Fn(&str) -> Option<&'a crate::schema::MixedBranchSchema>,
++    {
++        for item in items {
++            let tagged_field = |name: &str| -> Option<&PolyValue> {
++                match item {
++                    PolyValue::Object(tagged) => tagged.get(name),
++                    PolyValue::Record { schema, values } => schema
++                        .fields
++                        .iter()
++                        .position(|field| field.name == name)
++                        .and_then(|idx| values.get(idx))
++                        .and_then(Option::as_ref),
++                    _ => None,
++                }
++            };
++            let Some(kind) = tagged_field("kind").and_then(PolyValue::as_str) else {
++                return Err(PolyXmlError::SerializationError(
++                    "Mixed content item has no kind".into(),
++                ));
++            };
++            let Some(content) = tagged_field("value") else {
++                return Err(PolyXmlError::SerializationError(
++                    "Mixed content item has no value".into(),
++                ));
++            };
++            if kind == "#text" {
++                let Some(text) = content.as_str() else {
++                    return Err(PolyXmlError::SerializationError(
++                        "Mixed text item must be a string".into(),
++                    ));
++                };
++                writer
++                    .write_event(Event::Text(BytesText::new(text)))
++                    .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
++                continue;
++            }
++            let Some(branch) = lookup(kind) else {
++                return Err(PolyXmlError::SerializationError(format!(
++                    "Unknown mixed content kind: {kind}"
++                )));
++            };
++            let local_name = std::str::from_utf8(&branch.xml_name)?;
++            let qualified = if let Some(ctx) = ns_ctx {
++                ctx.qualify_element(
++                    local_name,
++                    branch.namespace.as_deref().or(schema.namespace.as_deref()),
++                )
++            } else {
++                Cow::Borrowed(local_name)
++            };
++            match &branch.val_type {
++                ValueType::Scalar(_) => {
++                    let mut buf = [0u8; lexical_core::BUFFER_SIZE];
++                    let Some(text) = Self::format_scalar_to(content, &mut buf) else {
++                        if content.is_null() {
++                            Self::write_mixed_nil(writer, qualified.as_ref())?;
++                            continue;
++                        }
++                        return Err(PolyXmlError::SerializationError(format!(
++                            "Invalid mixed content value for {kind}"
++                        )));
++                    };
++                    Self::validate_scalar(&branch.val_type, &text, kind)?;
++                    writer
++                        .write_event(Event::Start(BytesStart::new(qualified.as_ref())))
++                        .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
++                    writer
++                        .write_event(Event::Text(BytesText::new(&text)))
++                        .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
++                    writer
++                        .write_event(Event::End(BytesEnd::new(qualified.as_ref())))
++                        .map_err(|e| PolyXmlError::SerializationError(e.to_string()))?;
++                }
++                ValueType::Nested(nested) => {
++                    if content.is_null() {
++                        Self::write_mixed_nil(writer, qualified.as_ref())?;
++                    } else {
++                        Self::write_model(
++                            writer,
++                            &branch.xml_name,
++                            content,
++                            nested,
++                            ns_ctx,
++                            false,
++                            branch.namespace.as_deref().or(nested.namespace.as_deref()),
++                        )?;
++                    }
++                }
++                ValueType::List(_) => {
++                    return Err(PolyXmlError::SerializationError(
++                        "Nested lists are invalid mixed content branches".into(),
++                    ))
++                }
++            }
++        }
++        Ok(())
++    }
++
++    // A tagged null is a present nil element, unlike an absent ordinary field.
++    // Bind the instance prefix locally without shadowing the element's QName.
++    // Scalar callers reach this through their existing failed-format path.
++    #[cold]
++    fn write_mixed_nil<W: std::io::Write>(writer: &mut Writer<W>, qualified: &str) -> Result<()> {
++        let (declaration, attribute) = if qualified.starts_with("xsi:") {
++            ("xmlns:xsi1", "xsi1:nil")
++        } else {
++            ("xmlns:xsi", "xsi:nil")
++        };
++        let mut element = BytesStart::new(qualified);
++        element.push_attribute((declaration, XSI_NS));
++        element.push_attribute((attribute, "true"));
++        writer
++            .write_event(Event::Empty(element))
++            .map_err(|error| PolyXmlError::SerializationError(error.to_string()))
++    }
++
+     fn write_any_wildcard_element<W: std::io::Write>(
+         writer: &mut quick_xml::Writer<W>,
+         val: &PolyValue,
+diff --git a/crates/polyxml-core/tests/test_mixed_branch_lookup.rs b/crates/polyxml-core/tests/test_mixed_branch_lookup.rs
+new file mode 100644
+index 0000000..52996dc
+--- /dev/null
++++ b/crates/polyxml-core/tests/test_mixed_branch_lookup.rs
+@@ -0,0 +1,122 @@
++use polyxml::schema::{FieldKind, FieldSchema, ModelSchema, ScalarType, ValueType};
++use polyxml::schema_parser::XsdParser;
++use polyxml::{deserialize, serialize, PolyValue};
++use std::{collections::HashMap, sync::Arc};
++
++fn tagged(kind: &str, value: PolyValue) -> PolyValue {
++    PolyValue::Object(HashMap::from([
++        ("kind".into(), PolyValue::String(kind.into())),
++        ("value".into(), value),
++    ]))
++}
++
++#[test]
++fn large_mixed_tables_keep_first_match_metadata_edits_records_and_nil() {
++    let declarations = (0..64)
++        .map(|i| format!(r#"<xs:element name="B{i}" type="xs:int"/>"#))
++        .collect::<String>();
++    let xsd = format!(
++        r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"><xs:element name="Root"><xs:complexType mixed="true"><xs:choice minOccurs="0" maxOccurs="unbounded">{declarations}</xs:choice></xs:complexType></xs:element></xs:schema>"#
++    );
++    let ir = XsdParser::new().parse_str(&xsd).unwrap();
++    let mut schema = ModelSchema::from_ir(&ir, Some("Root")).unwrap();
++    let mixed = schema.mixed_content.as_ref().unwrap();
++    let items_name = schema.fields[mixed.items_index].name.clone();
++    let kinds = (0..64)
++        .map(|i| {
++            mixed
++                .branches
++                .iter()
++                .find(|b| b.xml_name == format!("B{i}").as_bytes())
++                .unwrap()
++                .variant_name
++                .clone()
++        })
++        .collect::<Vec<_>>();
++    let first_index = mixed
++        .branches
++        .iter()
++        .position(|b| b.xml_name == b"B0")
++        .unwrap();
++    let old_kind = kinds[0].clone();
++    let record_schema = ModelSchema::builder("Tagged")
++        .field(FieldSchema::new(
++            "value",
++            b"value",
++            FieldKind::Element,
++            ValueType::Scalar(ScalarType::Int),
++        ))
++        .field(FieldSchema::new(
++            "kind",
++            b"kind",
++            FieldKind::Element,
++            ValueType::Scalar(ScalarType::String),
++        ))
++        .build();
++    let mut items = (0..256)
++        .map(|i| tagged(&kinds[i % 64], PolyValue::Int(i as i64)))
++        .collect::<Vec<_>>();
++    items[0] = PolyValue::Record {
++        schema: record_schema,
++        values: vec![
++            Some(PolyValue::Int(0)),
++            Some(PolyValue::String(old_kind.clone())),
++        ]
++        .into_boxed_slice(),
++    };
++    items.push(tagged(&kinds[63], PolyValue::Null));
++    let mut value = PolyValue::Object(HashMap::from([(
++        items_name.clone(),
++        PolyValue::List(items),
++    )]));
++    {
++        let mixed = Arc::get_mut(&mut schema)
++            .unwrap()
++            .mixed_content
++            .as_mut()
++            .unwrap();
++        let mut duplicate = mixed.branches[first_index].clone();
++        duplicate.xml_name = b"Duplicate".to_vec();
++        mixed.branches.push(duplicate);
++    }
++    let output = serialize("Root", &value, &schema, None).unwrap();
++    assert!(std::str::from_utf8(&output).unwrap().contains("<B0>0</B0>"));
++    assert!(!std::str::from_utf8(&output).unwrap().contains("<Duplicate"));
++    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
++    Arc::get_mut(&mut schema)
++        .unwrap()
++        .mixed_content
++        .as_mut()
++        .unwrap()
++        .branches[first_index]
++        .variant_name = "changed_kind".into();
++    let PolyValue::Object(root) = &mut value else {
++        unreachable!()
++    };
++    let PolyValue::List(items) = root.get_mut(&items_name).unwrap() else {
++        unreachable!()
++    };
++    for item in items.iter_mut() {
++        if item.get("kind").and_then(PolyValue::as_str) == Some(old_kind.as_str()) {
++            match item {
++                PolyValue::Object(fields) => {
++                    fields.insert("kind".into(), PolyValue::String("changed_kind".into()));
++                }
++                PolyValue::Record { values, .. } => {
++                    values[1] = Some(PolyValue::String("changed_kind".into()))
++                }
++                _ => unreachable!(),
++            }
++        }
++    }
++    let output = serialize("Root", &value, &schema, None).unwrap();
++    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
++    let PolyValue::Object(root) = &mut value else {
++        unreachable!()
++    };
++    let PolyValue::List(items) = root.get_mut(&items_name).unwrap() else {
++        unreachable!()
++    };
++    items[0] = tagged("unregistered", PolyValue::Int(0));
++    assert!(serialize("Root", &value, &schema, None).is_err());
++}
+diff --git a/crates/polyxml-core/tests/test_mixed_nil.rs b/crates/polyxml-core/tests/test_mixed_nil.rs
+new file mode 100644
+index 0000000..95cc765
+--- /dev/null
++++ b/crates/polyxml-core/tests/test_mixed_nil.rs
+@@ -0,0 +1,93 @@
++use std::collections::HashMap;
++use std::sync::Arc;
++
++use polyxml::schema::ModelSchema;
++use polyxml::schema_parser::XsdParser;
++use polyxml::serializer::XmlSerializer;
++use polyxml::{deserialize, serialize, PolyValue};
++
++fn schema(namespace: Option<&str>) -> Arc<ModelSchema> {
++    let declaration = namespace
++        .map(|ns| format!("targetNamespace='{ns}' xmlns:t='{ns}' elementFormDefault='qualified'"))
++        .unwrap_or_default();
++    let xsd = format!("<xs:schema xmlns:xs='http://www.w3.org/2001/XMLSchema' {declaration}>
++      <xs:element name='Root'><xs:complexType mixed='true'><xs:choice minOccurs='0' maxOccurs='unbounded'>
++        <xs:element name='Text' type='xs:string' nillable='true'/>
++        <xs:element name='Number' type='xs:int' nillable='true'/>
++        <xs:element name='Child' nillable='true'><xs:complexType><xs:sequence>
++          <xs:element name='Value' type='xs:string'/>
++        </xs:sequence></xs:complexType></xs:element>
++      </xs:choice></xs:complexType></xs:element></xs:schema>");
++    let ir = XsdParser::new().parse_str(&xsd).unwrap();
++    ModelSchema::from_ir(&ir, Some("Root")).unwrap()
++}
++
++#[test]
++fn nil_scalar_and_nested_items_keep_order_and_differ_from_empty_strings() {
++    let schema = schema(None);
++    for nil in [
++        "<Text i:nil='true'/>",
++        "<Text i:nil='1'></Text>",
++        "<Number i:nil='true'/>",
++        "<Child i:nil='true'/>",
++    ] {
++        let xml = format!("<Root xmlns:i='http://www.w3.org/2001/XMLSchema-instance'>before{nil}<Text/><Child><Value>nested</Value></Child>{nil}<Text>after</Text></Root>");
++        let value = deserialize(xml.as_bytes(), Arc::clone(&schema)).unwrap();
++        let items_field = &schema.fields[schema.mixed_content.as_ref().unwrap().items_index].name;
++        let items = value.get(items_field).and_then(PolyValue::as_list).unwrap();
++        assert!(items[1].get("value").unwrap().is_null());
++        assert_eq!(items[2].get("value").and_then(PolyValue::as_str), Some(""));
++        assert!(items[4].get("value").unwrap().is_null());
++        let output = serialize("Root", &value, &schema, None).unwrap();
++        assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
++    }
++}
++
++#[test]
++fn nil_instance_prefix_does_not_rebind_the_element_namespace() {
++    let schema = schema(Some("urn:document"));
++    let xml = b"<Root xmlns='urn:document' xmlns:i='http://www.w3.org/2001/XMLSchema-instance'><Text i:nil='true'/><Number i:nil='true'/><Child i:nil='true'/><Text>after</Text></Root>";
++    let value = deserialize(xml, Arc::clone(&schema)).unwrap();
++    for prefix in ["", "doc", "xsi", "xsi1"] {
++        let ns_map = HashMap::from([(prefix.to_owned(), "urn:document".to_owned())]);
++        let output = XmlSerializer::serialize_with_options(
++            "Root",
++            &value,
++            &schema,
++            None,
++            Some(true),
++            Some(&ns_map),
++        )
++        .unwrap();
++        let mut reader = quick_xml::NsReader::from_reader(output.as_slice());
++        let mut nils = 0;
++        loop {
++            let (namespace, event) = reader.read_resolved_event().unwrap();
++            match event {
++                quick_xml::events::Event::Empty(element) => {
++                    assert!(
++                        matches!(namespace, quick_xml::name::ResolveResult::Bound(uri) if uri.as_ref() == "urn:document")
++                    );
++                    for attribute in element.attributes() {
++                        let attribute = attribute.unwrap();
++                        if attribute.key.local_name().as_ref() == "nil" {
++                            let (namespace, _) = reader.resolver().resolve_attribute(attribute.key);
++                            assert!(
++                                matches!(namespace, quick_xml::name::ResolveResult::Bound(uri) if uri.as_ref() == "http://www.w3.org/2001/XMLSchema-instance")
++                            );
++                            nils += 1;
++                        }
++                    }
++                }
++                quick_xml::events::Event::Eof => break,
++                _ => {}
++            }
++        }
++        assert_eq!(nils, 3);
++        assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
++    }
++    let output =
++        XmlSerializer::serialize_with_options("Root", &value, &schema, None, Some(false), None)
++            .unwrap();
++    assert_eq!(value, deserialize(&output, schema).unwrap());
++}
+diff --git a/crates/polyxml-core/tests/test_runtime_fast_paths.rs b/crates/polyxml-core/tests/test_runtime_fast_paths.rs
+index c0f13f1..07aa439 100644
+--- a/crates/polyxml-core/tests/test_runtime_fast_paths.rs
++++ b/crates/polyxml-core/tests/test_runtime_fast_paths.rs
+@@ -239,6 +239,8 @@ fn unified_scalar_state_keeps_mixed_branch_order_nil_and_nested_frames() {
+         assert_eq!(value,deserialize(&output,Arc::clone(&schema)).unwrap());
+     }
+     let nil_document = b"<Root xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'><Text xsi:nil='true'/><State>Ready</State></Root>";
+-    assert!(deserialize(nil_document, Arc::clone(&schema)).is_ok());
++    let value = deserialize(nil_document, Arc::clone(&schema)).unwrap();
++    let output = serialize("Root", &value, &schema, None).unwrap();
++    assert_eq!(value, deserialize(&output, Arc::clone(&schema)).unwrap());
+     assert!(deserialize(b"<Root><State>invalid</State></Root>", schema).is_err());
+ }
diff --git a/research/data/runtime-followups-2026-10-03/namespace-entities/SHA256SUMS b/research/data/runtime-followups-2026-10-03/namespace-entities/SHA256SUMS
new file mode 100644
index 0000000..52081ae
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/namespace-entities/SHA256SUMS
@@ -0,0 +1,4 @@
+eabcc902c35bfd262c2a1009a50e06f82f24a792be3c605068cd3735a9b267a6  metadata.json
+df1ef8b4289ef8587a49e3df9e7ad98322894a41c22c1100d8f4085fac4e4f90  namespace-entities-baseline-tests.log
+139cd3ae6bc1c7399bf99d7d0144004277ebddd8bdeb9388539cd1b9edffd3af  namespace-entities-gate.log
+8258e57b86805096a3e08fd9b63e5493d1f18d90e7d2ee5a0721d36c66b56824  namespace-entities-tests.log
diff --git a/research/data/runtime-followups-2026-10-03/namespace-entities/metadata.json b/research/data/runtime-followups-2026-10-03/namespace-entities/metadata.json
new file mode 100644
index 0000000..81ed394
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/namespace-entities/metadata.json
@@ -0,0 +1,8 @@
+{
+  "baseline": "1819c91",
+  "implementation": "ad9282e",
+  "rust_tests": 325,
+  "workspace_target": "/home/bailey/github/PolyXML/target/followup-namespace-verification",
+  "command": "PATH=/tmp/polyxml-corpus-tools/node_modules/.bin:$PATH CARGO_TARGET_DIR=/home/bailey/github/PolyXML/target/followup-namespace-verification POLYXML_MEMCAP_BACKEND=systemd CARGO_BUILD_JOBS=1 DOTNET_ROLL_FORWARD=Major scripts/memcap.sh scripts/gate.sh",
+  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)\nbinary: rustc\ncommit-hash: b940084d7eb6a299eb4bfeb8e34901bc051e7ac4\ncommit-date: 2026-09-28\nhost: x86_64-unknown-linux-gnu\nrelease: 1.99.0\nLLVM version: 23.1.1\n"
+}
diff --git a/research/data/runtime-followups-2026-10-03/namespace-entities/namespace-entities-baseline-tests.log b/research/data/runtime-followups-2026-10-03/namespace-entities/namespace-entities-baseline-tests.log
new file mode 100644
index 0000000..4f603ef
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/namespace-entities/namespace-entities-baseline-tests.log
@@ -0,0 +1,37 @@
+memcap: <=7762 MiB (60% of 12937 MiB available) [systemd MemoryMax, swap off]
+   Compiling polyxml v0.34.6 (/home/bailey/github/polyxml-namespace-entities/crates/polyxml-core)
+    Finished `test` profile [unoptimized + debuginfo] target(s) in 6.78s
+     Running tests/test_namespace_entities.rs (/home/bailey/github/PolyXML/target/followup-borrow-verification/debug/deps/test_namespace_entities-4bd83b729ca4f37e)
+
+running 3 tests
+test escaped_namespace_bindings_match_strict_root_and_round_trip ... FAILED
+test undefined_entities_cannot_form_namespace_bindings ... FAILED
+test entity_decoding_applies_to_inherited_and_local_xsi_type_bindings ... FAILED
+
+failures:
+
+---- escaped_namespace_bindings_match_strict_root_and_round_trip stdout ----
+
+thread 'escaped_namespace_bindings_match_strict_root_and_round_trip' (502620) panicked at crates/polyxml-core/tests/test_namespace_entities.rs:27:70:
+called `Result::unwrap()` on an `Err` value: SchemaError("Unexpected root element {urn:polyxml:A&amp;B}Root")
+note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
+
+---- undefined_entities_cannot_form_namespace_bindings stdout ----
+
+thread 'undefined_entities_cannot_form_namespace_bindings' (502621) panicked at crates/polyxml-core/tests/test_namespace_entities.rs:75:9:
+<Root xmlns='urn:polyxml:&undefined;'/>
+
+---- entity_decoding_applies_to_inherited_and_local_xsi_type_bindings stdout ----
+
+thread 'entity_decoding_applies_to_inherited_and_local_xsi_type_bindings' (502619) panicked at crates/polyxml-core/tests/test_namespace_entities.rs:51:59:
+called `Result::unwrap()` on an `Err` value: SchemaError("xsi:type=\"t:Derived\" does not match any known derivation of 'Root' (known: Derived)")
+
+
+failures:
+    entity_decoding_applies_to_inherited_and_local_xsi_type_bindings
+    escaped_namespace_bindings_match_strict_root_and_round_trip
+    undefined_entities_cannot_form_namespace_bindings
+
+test result: FAILED. 0 passed; 3 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+error: test failed, to rerun pass `-p polyxml --test test_namespace_entities`
diff --git a/research/data/runtime-followups-2026-10-03/namespace-entities/namespace-entities-gate.log b/research/data/runtime-followups-2026-10-03/namespace-entities/namespace-entities-gate.log
new file mode 100644
index 0000000..6e26f65
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/namespace-entities/namespace-entities-gate.log
@@ -0,0 +1,985 @@
+memcap: <=7744 MiB (60% of 12907 MiB available) [systemd MemoryMax, swap off]
+==> [1/6] Running Rust format check (cargo fmt)...
+==> [2/6] Running Rust Clippy (cargo clippy -D warnings)...
+   Compiling proc-macro2 v1.0.107
+   Compiling unicode-ident v1.0.24
+   Compiling quote v1.0.47
+   Compiling syn v3.0.5
+   Compiling serde_core v1.0.229
+    Checking memchr v2.8.3
+   Compiling serde v1.0.229
+   Compiling serde_derive v1.0.229
+   Compiling syn v2.0.119
+    Checking lexical-util v1.0.7
+   Compiling zmij v1.0.23
+   Compiling serde_json v1.0.151
+    Checking siphasher v1.0.3
+    Checking phf_shared v0.14.0
+    Checking aho-corasick v1.1.5
+    Checking fastrand v2.5.0
+    Checking itoa v1.0.18
+    Checking regex-syntax v0.8.11
+    Checking regex-automata v0.4.18
+    Checking lexical-write-integer v1.0.6
+    Checking lexical-parse-integer v1.0.6
+   Compiling thiserror v2.0.21
+    Checking lexical-parse-float v1.0.6
+    Checking lexical-write-float v1.0.6
+    Checking regex v1.13.1
+    Checking phf_generator v0.14.0
+   Compiling thiserror-impl v2.0.21
+    Checking memo-map v0.3.4
+    Checking minijinja v2.24.0
+    Checking phf_codegen v0.14.0
+    Checking lexical-core v1.0.6
+    Checking quick-xml v0.42.0
+    Checking heck v0.5.0
+    Checking smallvec v1.16.2
+    Checking once_cell v1.21.4
+   Compiling libc v0.2.189
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+   Compiling target-lexicon v0.13.5
+   Compiling wasm-bindgen-shared v0.2.129
+   Compiling pyo3-build-config v0.29.2
+    Checking winnow v1.0.4
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+   Compiling bumpalo v3.20.3
+   Compiling unicode-segmentation v1.13.3
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+   Compiling napi-build v2.5.0
+   Compiling semver v1.0.28
+   Compiling napi-derive-backend v1.0.75
+   Compiling polyxml-js v0.34.6 (/home/bailey/github/polyxml-namespace-entities/crates/polyxml-js)
+   Compiling pyo3-macros v0.29.2
+   Compiling wasm-bindgen-macro v0.2.129
+    Checking polyxml-cli v0.34.6 (/home/bailey/github/polyxml-namespace-entities/crates/polyxml-cli)
+   Compiling ctor v0.2.9
+    Checking napi-sys v2.4.0
+   Compiling napi-derive v2.16.13
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+    Checking polyxml-wasm v0.34.6 (/home/bailey/github/polyxml-namespace-entities/crates/polyxml-wasm)
+    Checking polyxml-python v0.34.6 (/home/bailey/github/polyxml-namespace-entities/crates/polyxml-python)
+    Checking polyxml-c v0.34.6 (/home/bailey/github/polyxml-namespace-entities/crates/polyxml-c)
+    Finished `dev` profile [unoptimized + debuginfo] target(s) in 50.76s
+==> [3/6] Running Rust workspace tests (cargo test)...
+   Compiling unicode-ident v1.0.24
+   Compiling proc-macro2 v1.0.107
+   Compiling quote v1.0.47
+   Compiling syn v3.0.5
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+   Compiling siphasher v1.0.3
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+   Compiling regex-syntax v0.8.11
+   Compiling serde_derive v1.0.229
+   Compiling heck v0.5.0
+   Compiling serde v1.0.229
+   Compiling lexical-util v1.0.7
+   Compiling syn v2.0.119
+   Compiling zmij v1.0.23
+   Compiling aho-corasick v1.1.5
+   Compiling phf_shared v0.14.0
+   Compiling fastrand v2.5.0
+   Compiling itoa v1.0.18
+   Compiling cfg-if v1.0.4
+   Compiling serde_json v1.0.151
+   Compiling regex-automata v0.4.18
+   Compiling lexical-parse-integer v1.0.6
+   Compiling lexical-write-integer v1.0.6
+   Compiling once_cell v1.21.4
+   Compiling lexical-write-float v1.0.6
+   Compiling lexical-parse-float v1.0.6
+   Compiling regex v1.13.1
+   Compiling phf_generator v0.14.0
+   Compiling thiserror-impl v2.0.21
+   Compiling memo-map v0.3.4
+   Compiling minijinja v2.24.0
+   Compiling thiserror v2.0.21
+   Compiling phf_codegen v0.14.0
+   Compiling lexical-core v1.0.6
+   Compiling quick-xml v0.42.0
+   Compiling smallvec v1.16.2
+   Compiling libc v0.2.189
+   Compiling polyxml v0.34.6 (/home/bailey/github/polyxml-namespace-entities/crates/polyxml-core)
+   Compiling utf8parse v0.2.2
+   Compiling anstyle-parse v1.0.0
+   Compiling is_terminal_polyfill v1.70.2
+   Compiling colorchoice v1.0.5
+   Compiling anstyle-query v1.1.5
+   Compiling anstyle v1.0.14
+   Compiling anstream v1.0.0
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+   Compiling clap_builder v4.6.7
+   Compiling clap_derive v4.6.7
+   Compiling bitflags v2.13.2
+   Compiling clap v4.6.7
+   Compiling linux-raw-sys v0.12.1
+   Compiling rustix v1.1.5
+   Compiling getrandom v0.4.3
+   Compiling zerocopy-derive v0.8.57
+   Compiling zerocopy v0.8.57
+   Compiling tempfile v3.27.0
+   Compiling half v2.7.1
+   Compiling ciborium-io v0.2.2
+   Compiling either v1.18.0
+   Compiling itertools v0.13.0
+   Compiling ciborium-ll v0.2.2
+   Compiling cast v0.3.0
+   Compiling same-file v1.0.6
+   Compiling walkdir v2.5.0
+   Compiling criterion-plot v0.8.2
+   Compiling num-traits v0.2.19
+   Compiling alloca v0.4.0
+   Compiling phf_macros v0.14.0
+   Compiling ciborium v0.2.2
+   Compiling page_size v0.6.0
+   Compiling tinytemplate v1.2.1
+   Compiling yansi v1.0.1
+   Compiling diff v0.1.13
+   Compiling anes v0.1.6
+   Compiling oorandom v11.1.5
+   Compiling criterion v0.8.2
+   Compiling pretty_assertions v1.4.1
+   Compiling phf v0.14.0
+   Compiling winnow v1.0.4
+   Compiling toml_parser v1.1.3+spec-1.1.0
+   Compiling toml_datetime v1.1.1+spec-1.1.0
+   Compiling serde_spanned v1.1.1
+   Compiling toml_writer v1.1.2+spec-1.1.0
+   Compiling toml v1.1.6+spec-1.1.0
+   Compiling wasm-bindgen-shared v0.2.129
+   Compiling glob v0.3.4
+   Compiling wasm-bindgen-macro-support v0.2.129
+   Compiling wasm-bindgen-macro v0.2.129
+   Compiling polyxml-cli v0.34.6 (/home/bailey/github/polyxml-namespace-entities/crates/polyxml-cli)
+   Compiling wasm-bindgen v0.2.129
+   Compiling pyo3-macros-backend v0.29.2
+   Compiling polyxml-js v0.34.6 (/home/bailey/github/polyxml-namespace-entities/crates/polyxml-js)
+   Compiling napi-derive-backend v1.0.75
+   Compiling pyo3-macros v0.29.2
+   Compiling pyo3-ffi v0.29.2
+   Compiling ctor v0.2.9
+   Compiling napi-sys v2.4.0
+   Compiling napi v2.16.17
+   Compiling pyo3 v0.29.2
+   Compiling napi-derive v2.16.13
+   Compiling polyxml-wasm v0.34.6 (/home/bailey/github/polyxml-namespace-entities/crates/polyxml-wasm)
+   Compiling polyxml-python v0.34.6 (/home/bailey/github/polyxml-namespace-entities/crates/polyxml-python)
+   Compiling polyxml-c v0.34.6 (/home/bailey/github/polyxml-namespace-entities/crates/polyxml-c)
+    Finished `test` profile [unoptimized + debuginfo] target(s) in 1m 16s
+     Running unittests src/lib.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/polyxml-675b717e531d04ed)
+
+running 16 tests
+test integer::tests::comparison_uses_sign_and_magnitude ... ok
+test ir::chunker::tests::test_topological_scc_chunking_dag_invariants ... ok
+test ir::root_selection_tests::inherited_base_does_not_select_sibling_types ... ok
+test ir::root_selection_tests::keeps_references_descendants_and_substitutions ... ok
+test json::tests::test_json_deserialization_accepts_python_field_names ... ok
+test json::tests::test_json_roundtrip_primitives ... ok
+test ir::root_selection_tests::rejects_missing_and_ambiguous_roots ... ok
+test tests::test_streaming_xml_item_stream ... ok
+test ir::root_selection_tests::field_reference_keeps_substitution_group_members ... ok
+test tests::test_nested_elements_and_lists ... ok
+test tests::test_roundtrip_serialization_deserialization ... ok
+test tests::test_deserialization_does_not_confuse_xmlns_with_attributes ... ok
+test pattern::tests::bounded_cache_evicts_and_retains_invalid_results ... ok
+test tests::test_namespaced_serialization ... ok
+test pattern::tests::cache_matches_uncached_regex_under_churn_and_concurrency ... ok
+test pattern::tests::cyclic_working_set_above_capacity_keeps_reusing_entries ... ok
+
+test result: ok. 16 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.16s
+
+     Running tests/test_adversarial_identifiers.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/test_adversarial_identifiers-34056256ccaa17cb)
+
+running 7 tests
+test test_rust_adversarial_compilation ... ok
+test test_python_adversarial_compilation ... ok
+test test_go_adversarial_compilation ... ok
+test test_cpp_adversarial_compilation ... ok
+test test_java_adversarial_compilation ... ok
+test test_typescript_adversarial_compilation ... ok
+test test_csharp_adversarial_compilation ... ok
+
+test result: ok. 7 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 4.71s
+
+     Running tests/test_any_attribute.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/test_any_attribute-d5795d9c5e0fdefd)
+
+running 1 test
+test test_any_attribute_schema_parser_and_runtime_roundtrip ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_any_element.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/test_any_element-1fb225d6616938e8)
+
+running 2 tests
+test test_any_element_go_codegen ... ok
+test test_any_element_schema_parser_and_runtime_roundtrip ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_conformance.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/test_conformance-0b37810d65fedfce)
+
+running 4 tests
+test test_soap_envelope_conformance ... ok
+test test_ubl_invoice_conformance ... ok
+test test_atom_feed_conformance ... ok
+test test_streaming_catalog_conformance ... ok
+
+test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.02s
+
+     Running tests/test_core.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/test_core-f4cc1079f88df2bc)
+
+running 9 tests
+test integer_mappings_keep_fixed_width_builtins ... ok
+test test_gregorian_partial_date_lexical_validation ... ok
+test test_all_scalar_types ... ok
+test test_malformed_xml_syntax_error ... ok
+test test_roundtrip_serialization_with_indentation ... ok
+test test_xsi_nil_handling ... ok
+test test_error_handling_invalid_scalars ... ok
+test unbounded_integers_round_trip_and_compare_exact_bounds ... ok
+test test_xsd_gregorian_fields_round_trip_and_reject_invalid_dates ... ok
+
+test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_cpp_codegen.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/test_cpp_codegen-a4cd5571504c64d5)
+
+running 14 tests
+test simple_aliases_follow_their_base_types ... ok
+test test_cpp_cmake_modules_file_set ... ok
+test test_cpp_cmake_and_meson_generation ... ok
+test test_cpp_mode_and_backend_from_str_loose ... ok
+test test_cpp_glaze_backend_meta_generation ... ok
+test test_cpp_sanitization ... ok
+test mixed_content_self_cycle_compiles ... ok
+test mixed_content_mutual_cycle_compiles ... ok
+Recursive tree unique_ptr passed.
+test test_cpp_recursive_cycle_unique_ptr ... ok
+Inheritance test passed.
+test test_cpp_inheritance_codegen ... ok
+Choice pattern matching passed.
+test test_cpp_choice_variant_compilation ... ok
+All C++20 tests passed successfully.
+test test_cpp_struct_and_enum_codegen_compilation ... ok
+test test_cpp_modules_compilation ... ok
+ISO 20022 pacs.008 C++20 test passed.
+test test_cpp_from_xsd_schema ... ok
+
+test result: ok. 14 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.84s
+
+     Running tests/test_csharp_codegen.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/test_csharp_codegen-cf32febf6e7f0777)
+
+running 20 tests
+test choice_variants_avoid_record_member_names ... ok
+test emits_unrestricted_simple_types_and_validates_empty_records ... ok
+test test_csharp_date_or_datetime_lexical_union ... ok
+test test_csharp_any_attribute_codegen ... ok
+test test_csharp_record_kind_from_str_loose ... ok
+test test_csharp_sanitization ... ok
+test test_csharp_sequence_nested_inside_choice_codegen ... ok
+test test_csharp_source_gen_context ... ok
+test unbounded_integer_xml_preserves_digits ... ok
+  Determining projects to restore...
+  Restored /tmp/.tmpOsIfWt/PaymentsApp.csproj (in 168 ms).
+  PaymentsApp -> /tmp/.tmpOsIfWt/bin/Debug/net8.0/PaymentsApp.dll
+
+Build succeeded.
+    0 Warning(s)
+    0 Error(s)
+
+Time Elapsed 00:00:01.02
+Choice pattern matching and XML serialization passed!
+test test_csharp_choice_polymorphic_hierarchy ... ok
+  Determining projects to restore...
+  Restored /tmp/.tmpFK5x4e/CrmApp.csproj (in 170 ms).
+  CrmApp -> /tmp/.tmpFK5x4e/bin/Debug/net8.0/CrmApp.dll
+
+Build succeeded.
+    0 Warning(s)
+    0 Error(s)
+
+Time Elapsed 00:00:01.06
+Customer C# tests passed cleanly!
+test test_csharp_records_and_enums_generation ... ok
+  Determining projects to restore...
+  Restored /tmp/.tmpcdPJ7o/TreeApp.csproj (in 168 ms).
+  TreeApp -> /tmp/.tmpcdPJ7o/bin/Debug/net8.0/TreeApp.dll
+
+Build succeeded.
+    0 Warning(s)
+    0 Error(s)
+
+Time Elapsed 00:00:01.02
+Recursive tree C# tests passed cleanly!
+test test_csharp_recursive_cycle ... ok
+test test_csharp_mutable_inheritance_roundtrip ... ok
+test test_csharp_mutable_wrappers_and_choices_without_validation ... ok
+test test_csharp_simple_content_class_validator_and_unsealed_records ... ok
+test lexical_union_attributes_round_trip ... ok
+test fixed_values_are_enforced_on_read_and_write ... ok
+test element_defaults_preserve_absence_and_empty_presence ... ok
+test nillable_enum_collection_round_trips ... ok
+test particle_wire_structure_round_trips ... ok
+
+test result: ok. 20 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 50.21s
+
+     Running tests/test_go_codegen.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/test_go_codegen-005c45ed4341be87)
+
+running 25 tests
+test root_alias_names_are_unique_after_go_normalization ... ok
+test referenced_element_uses_declared_type_after_includes ... ok
+test test_go_any_attribute_codegen ... ok
+test test_go_backend_from_str_loose ... ok
+go: creating new go.mod: module payments
+go: to add module requirements and sums:
+	go mod tidy
+test imported_ordered_types_do_not_add_unused_bytes_import ... ok
+test test_go_date_or_datetime_lexical_union ... ok
+test test_go_easyjson_backend ... ok
+test test_go_enum_only_schema_omits_unused_xml_import ... ok
+test abstract_substitution_heads_are_rejected ... ok
+go: creating new go.mod: module tree
+go: to add module requirements and sums:
+	go mod tidy
+test nested_lexical_unions_compile_and_round_trip_in_go ... ok
+test test_go_sanitization ... ok
+test roots_and_union_attributes_round_trip ... ok
+test test_go_sonic_backend ... ok
+test repeated_sequence_groups_enforce_bounds_and_order ... ok
+go: creating new go.mod: module crm
+test duplicate_choice_names_reject_invalid_branch_shapes ... ok
+go: to add module requirements and sums:
+	go mod tidy
+test separate_choices_enforce_each_group ... ok
+test repeated_choice_branch_rejects_mixed_and_empty_selections ... ok
+test test_go_abstract_xsi_type_dispatch ... ok
+=== RUN   TestChoiceMutualExclusivity
+    payments_test.go:44: Correctly rejected concurrent choice branches: choice ContactChoice mutual exclusivity violation: multiple branches populated (2)
+--- PASS: TestChoiceMutualExclusivity (0.00s)
+PASS
+ok  	payments	0.003s
+test temporal_scalars_preserve_xsd_lexical_values ... ok
+test test_go_choice_mutual_exclusivity ... ok
+test test_go_namespaced_element_ref_matching ... ok
+=== RUN   TestRecursiveTree
+--- PASS: TestRecursiveTree (0.00s)
+PASS
+ok  	tree	0.002s
+test test_go_recursive_cycle_pointers ... ok
+=== RUN   TestCustomerRoundtrip
+--- PASS: TestCustomerRoundtrip (0.00s)
+PASS
+ok  	crm	0.003s
+test test_go_struct_and_enum_generation ... ok
+test unbounded_integer_xml_preserves_digits ... ok
+test ordered_particles_and_choice_branches_round_trip ... ok
+
+test result: ok. 25 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 1.08s
+
+     Running tests/test_java_codegen.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/test_java_codegen-a6078e165fc64681)
+
+running 17 tests
+test test_direct_codec_rejects_wildcards_and_name_collisions ... ok
+test test_java_jackson_backend_enum_annotations ... ok
+test test_java_identifier_sanitization ... ok
+test test_java_jackson_backend_from_str_loose ... ok
+test test_java_jackson_backend_simple_type_annotations ... ok
+test test_java_jackson_backend_union_annotations ... ok
+test test_java_jackson_backend_struct_annotations ... ok
+test test_java_bean_validation_annotations_are_opt_in ... ok
+test jackson3_preserves_core_annotations_and_maps_record_text ... ok
+test test_java_plain_record_inlines_base_fields ... ok
+test test_java_module_container_class ... ok
+test test_java_records_and_enums_generation ... ok
+test test_java_sealed_interface_choice ... ok
+test test_java_plain_record_extension_javac_execute ... ok
+test test_java_record_builder_and_nested_codec_execute ... ok
+test test_java_mutable_builders_and_direct_codecs_execute ... ok
+test test_java_direct_nil_lists_choices_and_namespaces ... ok
+
+test result: ok. 17 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 2.46s
+
+     Running tests/test_json.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/test_json-74440efee0e911e7)
+
+running 4 tests
+test test_polyvalue_direct_json_methods ... ok
+test test_json_scalar_coercion ... ok
+test test_json_primitives_and_alias_modes ... ok
+test test_json_nested_objects_and_lists ... ok
+
+test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_lexical_lists.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/test_lexical_lists-0f6750d9c4bf9a3c)
+
+running 2 tests
+test named_list_items_enforce_facets_and_enumerations ... ok
+test typed_lexical_lists_round_trip_across_codecs ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 3.27s
+
+     Running tests/test_lexical_union_codegen.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/test_lexical_union_codegen-3c208893561d2732)
+
+running 2 tests
+test lexical_union_xml_selects_first_valid_member_and_round_trips ... ok
+test lexical_unions_are_typed_in_all_targets ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_mixed_content.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/test_mixed_content-1a697ad935ae2797)
+
+running 5 tests
+test mixed_items_field_avoids_existing_attribute_name ... ok
+test parser_builds_ordered_mixed_content_union ... ok
+test mixed_content_preserves_text_and_child_order ... ok
+test mixed_content_preserves_nested_child_order ... ok
+test generated_models_keep_typed_content_items_in_all_targets ... ok
+
+test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_namespace_entities.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/test_namespace_entities-4c617e2673a7b703)
+
+running 4 tests
+test namespace_entity_values_are_decoded_once ... ok
+test entity_decoding_applies_to_inherited_and_local_xsi_type_bindings ... ok
+test undefined_entities_cannot_form_namespace_bindings ... ok
+test escaped_namespace_bindings_match_strict_root_and_round_trip ... ok
+
+test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_pattern_codegen.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/test_pattern_codegen-5eee5f9fe2ed3d1a)
+
+running 9 tests
+test generated_typescript_pattern_validation_all_backends ... ok
+test pattern_restrictions_preserve_or_groups_and_inherited_and_steps ... ok
+test gregorian_primitives_emit_validated_types_across_targets ... ok
+test generated_go_pattern_validation_and_xml_roundtrip ... ok
+test generated_python_pattern_validation ... ok
+test generated_java_pattern_validation_and_direct_codecs ... ok
+test generated_cpp_pattern_validation ... ok
+test generated_csharp_pattern_validation ... ok
+test generated_rust_pattern_validation_and_xml_roundtrip ... ok
+
+test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 24.46s
+
+     Running tests/test_python_codegen.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/test_python_codegen-cc734e908fb39fb6)
+
+running 16 tests
+test test_identifier_sanitization ... ok
+test test_python_abstract_meta_emission ... ok
+test multiline_xsd_documentation_stays_inside_python_comments ... ok
+test test_python_choice_union_codegen ... ok
+test test_python_codecs_generation ... ok
+test test_python_any_element_codegen ... ok
+test test_python_any_attribute_codegen ... ok
+test test_python_dataclass_codegen ... ok
+test test_python_generated_tag_and_custom_header ... ok
+test test_python_recursive_type_codegen ... ok
+test test_python_pydantic_codegen_with_facets ... ok
+test test_python_aot_codegen ... ok
+test test_python_derived_meta_inheritance ... ok
+test test_python_simplecontent_default_factory ... ok
+test test_python_sequence_nested_inside_choice_codegen ... ok
+test quoted_docstrings_preserve_text_and_remain_valid_python ... ok
+
+test result: ok. 16 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.04s
+
+     Running tests/test_qualified_attributes.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/test_qualified_attributes-f8397a31cf1ecf15)
+
+running 5 tests
+test global_attribute_references_round_trip_by_namespace ... ok
+test imported_inline_global_attribute_enum_round_trips ... ok
+test derived_validators_preserve_base_constraints ... ok
+test inherited_attribute_and_distinct_element_keep_separate_property_names ... ok
+test lexical_dependencies_compile_and_round_trip_without_implicit_imports ... ok
+
+test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 8.11s
+
+     Running tests/test_runtime_fast_paths.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/test_runtime_fast_paths-7bf9091b7252b7db)
+
+running 6 tests
+test repeated_lexical_lists_keep_whitespace_validation ... ok
+test repeated_nested_records_validate_their_own_lexical_lists ... ok
+test lexical_list_formatting_preserves_escaping_empty_lists_and_long_numbers ... ok
+test indexed_scalar_state_preserves_enum_pattern_and_split_text ... ok
+test cached_patterns_keep_raw_restriction_and_trimmed_pattern_semantics ... ok
+test unified_scalar_state_keeps_mixed_branch_order_nil_and_nested_frames ... ok
+
+test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_rust_codecs.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/test_rust_codecs-9692e165bd5e14bf)
+
+running 4 tests
+test test_empty_element_codec ... ok
+test test_facet_validation_min_max_length ... ok
+test test_order_choice_roundtrip ... ok
+test test_recursive_boxing_roundtrip ... ok
+
+test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_rust_codegen.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/test_rust_codegen-8bce8b4b67c7eca3)
+
+running 26 tests
+test test_rust_attribute_codec_loop_syntax ... ok
+test multiline_docs_and_raw_field_names_are_valid_source ... ok
+test test_rust_choice_union_codegen ... ok
+test test_rust_digit_prefixed_module_sanitization ... ok
+test test_rust_enum_and_methods ... ok
+test test_rust_codecs_codegen ... ok
+test test_rust_identifier_sanitization ... ok
+test test_rust_owned_codegen ... ok
+test test_rust_extension_base_cycle_cut ... ok
+test test_rust_phf_dispatch_union_groups_branch_tags ... ok
+test test_rust_extension_inlines_base_fields ... ok
+test test_rust_extension_codecs_decode_and_encode_base_fields ... ok
+test test_rust_recursive_cycle_boxing ... ok
+test test_rust_rkyv_derives ... ok
+test test_rust_phf_dispatch_uniquifies_like_field_metas ... ok
+test test_rust_phf_dispatch_emission ... ok
+test test_rust_simple_type_cycle_resilience ... ok
+test test_rust_zero_copy_codegen ... ok
+test test_rust_topological_scc_chunking ... ok
+test test_rust_simple_content_extension_shadow_rule ... ok
+test test_rust_simple_content_text_codec ... ok
+test test_rust_read_element_text_accumulates_refs_and_cdata ... ok
+test binary_lexical_values_compile_and_round_trip_in_owned_and_borrowed_modes ... ok
+test empty_modules_compile_without_unused_reexports ... ok
+test duplicate_wire_names_keep_distinct_json_values ... ok
+test named_choice_wrappers_round_trip_without_unreachable_dispatch ... ok
+
+test result: ok. 26 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 58.73s
+
+     Running tests/test_schema_audit.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/test_schema_audit-24992dfb5b4a626c)
+
+running 13 tests
+test duplicate_enumeration_values_are_deduped ... ok
+test distinct_values_with_colliding_variant_names_stay_unique ... ok
+test derived_simple_type_inherits_base_patterns ... ok
+test quick_xml_serde_skips_unknown_elements ... ok
+test all_languages_disambiguate_flat_collision ... ok
+test generated_rust_has_no_deny_unknown_fields ... ok
+test nested_inline_complex_type_is_extracted_not_leaked ... ok
+test rust_flat_output_has_no_colliding_type_names ... ok
+test simple_content_extension_emits_value_field ... ok
+test named_group_reference_fields_are_parsed ... ok
+test restricted_simple_types_emit_named_aliases ... ok
+test chameleon_include_adopts_including_namespace_per_includer ... ok
+test diamond_includes_do_not_duplicate_upa_source_documents ... ok
+
+test result: ok. 13 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_schema_ir.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/test_schema_ir-f793c1b9895343c7)
+
+running 20 tests
+test global_attribute_reference_uses_declared_type ... ok
+test consumed_child_subtrees_do_not_swallow_following_types ... ok
+test schema_errors_preserve_forward_imports_and_annotation_payloads ... ok
+test consumed_particles_do_not_swallow_following_declarations ... ok
+test test_language_context_adapter ... ok
+test inline_list_item_types_preserve_enum_and_union_declarations ... ok
+test test_list_fields_do_not_trigger_spurious_cycles ... ok
+test missing_included_schema_is_an_error ... ok
+test derived_complex_type_keeps_base_and_bounded_choice ... ok
+test schema_for_schemas_declared_types_are_not_unknown_builtins ... ok
+test test_tarjan_mutual_recursive_cycle_detection_and_boxing ... ok
+test test_parse_lexical_union_member_types_and_inline_members ... ok
+test test_substitution_groups ... ok
+test test_tarjan_self_recursive_cycle_detection_and_boxing ... ok
+test test_minijinja_template_engine_and_filters ... ok
+test xml_prefix_is_available_without_explicit_declaration ... ok
+test test_parse_complex_type_and_facets ... ok
+test imported_inline_global_attribute_types_are_resolved ... ok
+test test_sequence_nested_inside_choice_preserved_in_ir ... ok
+test test_parse_choice_as_union ... ok
+
+test result: ok. 20 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_security.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/test_security-c3afa670f1d6c619)
+
+running 6 tests
+test test_cdata_section_handling ... ok
+test test_malformed_unclosed_cdata_rejection ... ok
+test unsupported_general_entities_are_rejected ... ok
+test test_xml_entity_roundtrip_escaping ... ok
+test test_numeric_character_references ... ok
+test test_max_depth_recursion_limit ... ok
+
+test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_temporal_union.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/test_temporal_union-e25d1f9b83e2fdc4)
+
+running 2 tests
+test go_temporal_union_preserves_branches_and_lexicals ... ok
+test csharp_temporal_union_preserves_branches_and_lexicals ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 3.01s
+
+     Running tests/test_transcoder.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/test_transcoder-6854114408316a2e)
+
+running 6 tests
+test test_schemaless_preserves_refs_cdata_and_attr_entities ... ok
+test test_schema_directed_transcoding ... ok
+test test_schemaless_pretty_transcoding ... ok
+test test_transcoder_errors ... ok
+test test_schemaless_xml_to_json_and_back ... ok
+test test_schema_from_ir_transcoding ... ok
+
+test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_ts_codegen.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/test_ts_codegen-4e67290c9758f4d9)
+
+running 9 tests
+test test_ts_backend_from_str_loose ... ok
+test test_ts_identifier_sanitization ... ok
+test test_ts_discriminated_union_choice ... ok
+test test_ts_interface_and_enum_codegen ... ok
+test test_ts_recursive_cycle_zod_lazy ... ok
+test test_ts_typebox_schema_generation ... ok
+test test_ts_zod_schema_generation ... ok
+test test_ts_valibot_schema_generation ... ok
+test mixed_content_inheritance_compiles_with_widened_items ... ok
+
+test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.32s
+
+     Running tests/test_ubl_csharp.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/test_ubl_csharp-b04bc8d2d5f891c2)
+
+running 2 tests
+test unprefixed_xsd_builtin_simple_content_base_uses_default_namespace ... ok
+test multi_namespace_roots_and_inherited_simple_content_compile_and_round_trip ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 3.02s
+
+     Running tests/test_unbounded_choice.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/test_unbounded_choice-7672e62aa5ecca1a)
+
+running 1 test
+go: creating new go.mod: module testmod
+go: to add module requirements and sums:
+	go mod tidy
+=== RUN   TestUnboundedChoiceOrder
+--- PASS: TestUnboundedChoiceOrder (0.00s)
+PASS
+ok  	testmod	0.002s
+test test_unbounded_choice_ir_and_all_targets ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.15s
+
+     Running tests/test_upa.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/test_upa-a20019d257c7eac5)
+
+running 6 tests
+test model_groups_derivation_and_substitution_members_are_checked ... ok
+test local_form_and_in_scope_qnames_distinguish_namespaces ... ok
+test imported_groups_and_chameleon_wildcards_keep_source_namespaces ... ok
+test all_groups_and_wildcard_namespaces_are_checked ... ok
+test optional_siblings_and_choice_lookahead_violate_upa ... ok
+test occurrence_ranges_keep_particle_identity_and_count_boundaries ... ok
+
+test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_value_constraints.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/test_value_constraints-73eb81a96de588c1)
+
+running 2 tests
+test fixed_constraints_cover_input_and_output_in_value_space ... ok
+test repeated_particle_cardinality_belongs_to_the_group ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_xsi_type.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/test_xsi_type-2c07a0776bd0ec60)
+
+running 11 tests
+test abstract_type_without_derivations_errors ... ok
+test abstract_type_requires_concrete_selector ... ok
+test from_ir_flattens_base_fields_and_registers_variants ... ok
+test plain_type_attribute_is_not_mistaken_for_dispatch ... ok
+test nil_abstract_complex_type_skips_concrete_dispatch ... ok
+test variant_serialization_requires_namespaces ... ok
+test root_xsi_type_dispatch_including_empty_element ... ok
+test iterparse_dispatches_each_streamed_item ... ok
+test unknown_xsi_type_on_abstract_type_errors ... ok
+test nested_xsi_type_dispatch_and_round_trip ... ok
+test xsi_type_resolves_namespace_inherited_from_parent ... ok
+
+test result: ok. 11 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running unittests src/lib.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/polyxml-4ccc220bbd6a27a0)
+
+running 2 tests
+test tests::test_c_abi_namespaced_roundtrip ... ok
+test tests::test_c_abi_nested_list_batch_roundtrip ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running unittests src/lib.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/polyxml_cli-dabf613ae4318f1b)
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running unittests src/main.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/polyxml-cec02944de7101b9)
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_cli.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/test_cli-714ccf0c30d96734)
+
+running 47 tests
+test fish_completion_filters_values_when_available ... ok
+Loading manifest: /tmp/.tmp6CzCFy/polyxml.toml
+Compiling schema: /tmp/.tmp6CzCFy/model.xsd
+test manifest_generation_does_not_ignore_cli_overrides ... ok
+  Namespace: urn:app
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Emitting target [csharp] into /tmp/.tmp6CzCFy/cs
+Emitting target [ts] into /tmp/.tmp6CzCFy/ts
+Emitting target [go] into /tmp/.tmp6CzCFy/go
+Emitting target [rust] into /tmp/.tmp6CzCFy/rs
+Build finished successfully.
+test test_cli_build_polyxml_manifest_with_new_features ... ok
+Parsing schema: /tmp/.tmpwIb502/customer.xsd
+  Namespace: urn:crm
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+test test_cli_csharp_source_gen_and_record_struct ... ok
+test test_cli_cpp_modules_and_glaze ... ok
+test jackson3_cli_and_manifest_emit_equivalent_models ... ok
+test test_cli_generate_dry_run ... ok
+test test_cli_generate_custom_header_and_generated_tags ... ok
+test imported_substitution_helpers_do_not_require_spurious_module_owners ... ok
+Parsing schema: /tmp/.tmpnmAVc1/service.xsd
+test test_cli_generate_help ... ok
+  Namespace: urn:service
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+test test_cli_generate_multi_lang ... ok
+Parsing schema: /tmp/.tmpnmAVc1/service.xsd
+test test_cli_help ... ok
+test python_features_respect_manifest_false_values_and_backend ... ok
+  Namespace: urn:service
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+test test_cli_go_easyjson_and_sonic_backend ... ok
+Loading manifest: /tmp/.tmpZJAinE/polyxml.toml
+Compiling schema: /tmp/.tmpZJAinE/schema.xsd
+test retained_imported_ordered_helpers_belong_to_the_unique_namespace_module ... ok
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Emitting target [rust] into /tmp/.tmpZJAinE/rs
+Emitting target [go] into /tmp/.tmpZJAinE/go
+Emitting target [csharp] into /tmp/.tmpZJAinE/cs
+Build finished successfully.
+test test_cli_manifest_custom_header_workspace_and_target_override ... ok
+test test_cli_generate_python_backends ... ok
+test test_cli_generate_rust_zero_copy_and_owned ... ok
+test test_cli_python_aot_generation ... ok
+Parsing schema: /tmp/.tmpXDspjd/event.xsd
+  Namespace: urn:events
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+Parsing schema: /tmp/.tmpHybuJJ/event.xsd
+  Namespace: urn:events
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+test completion_candidates_follow_target_validation ... ok
+test test_cli_rust_phf_feature ... ok
+test test_cli_multiple_root_element_selection ... ok
+test test_cli_rust_rkyv_feature ... ok
+test test_cli_python_aot_rejects_dataclass_style_and_slots ... ok
+go: creating new go.mod: module crm
+go: to add module requirements and sums:
+	go mod tidy
+test invalid_schema_grammar_and_types_fail_before_generation ... ok
+Parsing schema: /tmp/.tmpOjFISS/item.xsd
+  Namespace: urn:store
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+test test_cli_transcode_bidirectional ... ok
+Parsing schema: /tmp/.tmpOjFISS/item.xsd
+test test_cli_validate_valid_and_invalid ... ok
+  Namespace: urn:store
+  Types: 1 total (1 structs, 0 enums, 0 unions, 0 simple restrictions)
+  Root elements: 0
+Code generation complete.
+test test_cli_typescript_valibot_and_typebox_backend ... ok
+test bash_completion_filters_values_in_the_shell ... ok
+test test_polyxml_toml_manifest_build ... ok
+test test_root_selection_keeps_imported_module_types ... ok
+test unified_help_shows_generation_options ... ok
+test test_cli_root_element_selection ... ok
+test test_java_csharp_model_style_options_and_manifest ... ok
+test unified_manifest_forms_generate_identical_output_and_validate_early ... ok
+test zsh_completion_filters_values_when_available ... ok
+test validate_and_generate_reject_upa_violations ... ok
+test unsupported_xsd_alternatives_fail_explicitly ... ok
+test unified_options_fail_before_schema_io_including_dry_run ... ok
+test unified_supported_backends_and_styles_validate ... ok
+=== RUN   TestAccountE2E
+--- PASS: TestAccountE2E (0.00s)
+PASS
+ok  	crm	0.004s
+test test_cli_go_generation ... ok
+E2E C++20 driver passed!
+test test_cli_cpp_generation ... ok
+test test_cli_java_generation ... ok
+test test_cli_shared_modules_deduplication ... ok
+  Determining projects to restore...
+  Restored /tmp/.tmpdctDVd/cli_csharp_app/CrmCliApp.csproj (in 207 ms).
+test test_cli_typescript_generation ... ok
+  CrmCliApp -> /tmp/.tmpdctDVd/cli_csharp_app/bin/Debug/net8.0/CrmCliApp.dll
+
+Build succeeded.
+    0 Warning(s)
+    0 Error(s)
+
+Time Elapsed 00:00:01.44
+E2E C# CLI test passed successfully!
+test test_cli_csharp_generation ... ok
+test test_cli_rust_split_units_and_chunking ... ok
+
+test result: ok. 47 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 9.47s
+
+     Running unittests src/lib.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/polyxml_js-878a75d7b7901cc9)
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running unittests src/lib.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/_polyxml-a668b0910babaf29)
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running unittests src/lib.rs (/home/bailey/github/PolyXML/target/followup-namespace-verification/debug/deps/polyxml_wasm-d510c7f48918b595)
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+   Doc-tests polyxml
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+   Doc-tests polyxml_cli
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+   Doc-tests polyxml_wasm
+
+running 0 tests
+
+test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+==> [4/6] Compiling Python PyO3 extension (maturin develop)...
+🍹 Building a mixed python/rust project
+🐍 Found CPython 3.14 at /home/bailey/github/polyxml-namespace-entities/.venv/bin/python
+🔗 Found pyo3 bindings with abi3-py3.12 support
+📡 Using build options features from pyproject.toml
+Using Python 3.14.4 environment at: /home/bailey/github/polyxml-namespace-entities/.venv
+Checked 6 packages in 32ms
+   Compiling syn v3.0.5
+   Compiling serde_core v1.0.229
+   Compiling serde_derive v1.0.229
+   Compiling serde v1.0.229
+   Compiling pyo3-ffi v0.29.2
+   Compiling syn v2.0.119
+   Compiling fastrand v2.5.0
+   Compiling phf_generator v0.14.0
+   Compiling pyo3-macros-backend v0.29.2
+   Compiling thiserror-impl v2.0.21
+   Compiling serde_json v1.0.151
+   Compiling minijinja v2.24.0
+   Compiling thiserror v2.0.21
+   Compiling pyo3 v0.29.2
+   Compiling pyo3-macros v0.29.2
+   Compiling phf_codegen v0.14.0
+   Compiling quick-xml v0.42.0
+   Compiling polyxml v0.34.6 (/home/bailey/github/polyxml-namespace-entities/crates/polyxml-core)
+   Compiling polyxml-python v0.34.6 (/home/bailey/github/polyxml-namespace-entities/crates/polyxml-python)
+    Finished `dev` profile [unoptimized + debuginfo] target(s) in 24.10s
+📦 Built wheel for abi3 Python ≥ 3.12 to /tmp/.tmpYx8hAm/polyxml-0.34.6-cp312-abi3-linux_x86_64.whl
+✏️ Setting installed package as editable
+🛠 Installed polyxml-0.34.6
+==> [5/6] Running Python Ruff checks...
+All checks passed!
+10 files already formatted
+==> [6/6] Running Python tests with 100% statement & branch coverage...
+........................................................................ [ 64%]
+........................................                                 [100%]
+================================ tests coverage ================================
+_______________ coverage: platform linux, python 3.14.4-final-0 ________________
+
+Name    Stmts   Miss Branch BrPart  Cover   Missing
+---------------------------------------------------
+TOTAL     181      0     58      0   100%
+
+3 files skipped due to complete coverage.
+Required test coverage of 100% reached. Total coverage: 100.00%
+112 passed in 0.63s
+✨ All PolyXML dual-language quality gates passed!
diff --git a/research/data/runtime-followups-2026-10-03/namespace-entities/namespace-entities-tests.log b/research/data/runtime-followups-2026-10-03/namespace-entities/namespace-entities-tests.log
new file mode 100644
index 0000000..46fb676
--- /dev/null
+++ b/research/data/runtime-followups-2026-10-03/namespace-entities/namespace-entities-tests.log
@@ -0,0 +1,57 @@
+memcap: <=7778 MiB (60% of 12963 MiB available) [systemd MemoryMax, swap off]
+   Compiling polyxml v0.34.6 (/home/bailey/github/polyxml-namespace-entities/crates/polyxml-core)
+    Finished `test` profile [unoptimized + debuginfo] target(s) in 4.35s
+     Running tests/test_any_attribute.rs (/home/bailey/github/PolyXML/target/followup-borrow-verification/debug/deps/test_any_attribute-f8564805a9b9d00f)
+
+running 1 test
+test test_any_attribute_schema_parser_and_runtime_roundtrip ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_any_element.rs (/home/bailey/github/PolyXML/target/followup-borrow-verification/debug/deps/test_any_element-48a6e5ab2c28f2fe)
+
+running 2 tests
+test test_any_element_go_codegen ... ok
+test test_any_element_schema_parser_and_runtime_roundtrip ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_namespace_entities.rs (/home/bailey/github/PolyXML/target/followup-borrow-verification/debug/deps/test_namespace_entities-4bd83b729ca4f37e)
+
+running 4 tests
+test namespace_entity_values_are_decoded_once ... ok
+test undefined_entities_cannot_form_namespace_bindings ... ok
+test entity_decoding_applies_to_inherited_and_local_xsi_type_bindings ... ok
+test escaped_namespace_bindings_match_strict_root_and_round_trip ... ok
+
+test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_security.rs (/home/bailey/github/PolyXML/target/followup-borrow-verification/debug/deps/test_security-e324fcc17a7a8524)
+
+running 6 tests
+test test_malformed_unclosed_cdata_rejection ... ok
+test test_cdata_section_handling ... ok
+test test_numeric_character_references ... ok
+test test_max_depth_recursion_limit ... ok
+test test_xml_entity_roundtrip_escaping ... ok
+test unsupported_general_entities_are_rejected ... ok
+
+test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
+     Running tests/test_xsi_type.rs (/home/bailey/github/PolyXML/target/followup-borrow-verification/debug/deps/test_xsi_type-c45053350e445953)
+
+running 11 tests
+test abstract_type_without_derivations_errors ... ok
+test plain_type_attribute_is_not_mistaken_for_dispatch ... ok
+test from_ir_flattens_base_fields_and_registers_variants ... ok
+test abstract_type_requires_concrete_selector ... ok
+test iterparse_dispatches_each_streamed_item ... ok
+test root_xsi_type_dispatch_including_empty_element ... ok
+test nil_abstract_complex_type_skips_concrete_dispatch ... ok
+test xsi_type_resolves_namespace_inherited_from_parent ... ok
+test unknown_xsi_type_on_abstract_type_errors ... ok
+test variant_serialization_requires_namespaces ... ok
+test nested_xsi_type_dispatch_and_round_trip ... ok
+
+test result: ok. 11 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
+
diff --git a/research/fixtures/default_literal_escaping.xsd b/research/fixtures/default_literal_escaping.xsd
new file mode 100644
index 0000000..103a48b
--- /dev/null
+++ b/research/fixtures/default_literal_escaping.xsd
@@ -0,0 +1,7 @@
+<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
+ <xs:complexType name="RootType"><xs:sequence>
+  <xs:element name="Value" type="xs:string" default="&quot;quoted&quot;\path\u000a&#9;&#10;&#13;&#x85;&#x2028;café 😀"/>
+  <xs:element name="Fixed" type="xs:string" fixed="&quot;quoted&quot;\path\u000a&#9;&#10;&#13;&#x85;&#x2028;café 😀"/>
+ </xs:sequence><xs:attribute name="Label" type="xs:string" default="&quot;quoted&quot;\path\u000a&#9;&#10;&#13;&#x85;&#x2028;café 😀"/>
+ </xs:complexType><xs:element name="Root" type="RootType"/>
+</xs:schema>
diff --git a/research/fixtures/enum_literal_escaping.xsd b/research/fixtures/enum_literal_escaping.xsd
new file mode 100644
index 0000000..6b2fd73
--- /dev/null
+++ b/research/fixtures/enum_literal_escaping.xsd
@@ -0,0 +1,13 @@
+<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
+  <xs:simpleType name="Status">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="R&amp;D"/>
+      <xs:enumeration value="&quot;quoted&quot; &apos;value&apos; &lt;tag&gt;"/>
+      <xs:enumeration value="caf&#xE9; &#128512;"/>
+      <xs:enumeration value="literal &amp;amp;"/>
+      <xs:enumeration value="slash\path\u000a"/>
+      <xs:enumeration value="tab&#9;line&#10;carriage&#13;tail"/>
+      <xs:enumeration value="&#x85;next&#x2028;line"/>
+    </xs:restriction>
+  </xs:simpleType>
+</xs:schema>
diff --git a/research/fixtures/schema_attribute_entities.xsd b/research/fixtures/schema_attribute_entities.xsd
new file mode 100644
index 0000000..00159ca
--- /dev/null
+++ b/research/fixtures/schema_attribute_entities.xsd
@@ -0,0 +1,27 @@
+<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
+  <xs:simpleType name="Status">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="R&amp;D"/>
+      <xs:enumeration value="R&#38;D"/>
+      <xs:enumeration value="&quot;quoted&quot; &apos;value&apos; &lt;tag&gt;"/>
+      <xs:enumeration value="caf&#xE9; &#128512;"/>
+      <xs:enumeration value="literal &amp;amp;"/>
+    </xs:restriction>
+  </xs:simpleType>
+  <xs:simpleType name="Code">
+    <xs:restriction base="xs:string">
+      <xs:pattern value="[A-Z]&amp;[A-Z]"/>
+    </xs:restriction>
+  </xs:simpleType>
+  <xs:complexType name="RootType">
+    <xs:sequence>
+      <xs:element name="Status" type="Status"/>
+      <xs:element name="Code" type="Code"/>
+      <xs:element name="Fixed" type="xs:string" fixed="R&amp;D"/>
+      <xs:element name="Default" type="xs:string" default="caf&#xE9;"/>
+    </xs:sequence>
+    <xs:attribute name="label" type="xs:string" default="&lt;label&gt;"/>
+    <xs:attribute name="mode" type="xs:string" fixed="R&amp;D"/>
+  </xs:complexType>
+  <xs:element name="Root" type="RootType"/>
+</xs:schema>
diff --git a/research/runtime-default-literals-2026-10-03.md b/research/runtime-default-literals-2026-10-03.md
new file mode 100644
index 0000000..16fd422
--- /dev/null
+++ b/research/runtime-default-literals-2026-10-03.md
@@ -0,0 +1,63 @@
+# Generated default and fixed strings — October 3, 2026
+
+This branch extends the entity and enum fix in draft PR #138. The implementation
+is `cb041c0`; stricter consumer tests and isolated-target test tooling are
+`a7ed359`. Main is unchanged.
+
+## Reproduced failure and fix
+
+The pre-fix CLI successfully generates a model for
+[the fixture](fixtures/default_literal_escaping.xsd), but Python rejects its
+source as an unterminated string literal. The default formatter escaped quotes
+without correctly escaping backslashes, referenced whitespace or source line
+separators. Python default/fixed metadata additionally used Rust Debug Unicode
+escapes. Similar gaps existed in C++ string initializers and C# default/fixed
+proxy literals.
+
+Use the existing JSON-compatible literal encoder for Python and C# and the C++
+encoder for its string initializers. C# reparses these lexical values through an
+internal XML element; encode carriage returns as `&#13;` after escaping markup
+so XML line-ending normalization does not change referenced carriage returns.
+
+This fixes literal encoding at these sites. It does not implement missing
+default semantics for other field kinds or backends, and it does not claim that
+all generated pattern/default literal sites have been audited.
+
+## Executed consumers
+
+An independent UTF-8 expected file checks quotes, literal backslash-u text,
+tabs, LF, CR, U+0085, U+2028, accented text and an emoji. Execute generated Python
+dataclasses and Pydantic models, C++ with `-Wall -Wextra -Werror`, and C# with
+`TreatWarningsAsErrors`. Check Python defaults and metadata, the C++ string
+initializer, and C# attribute initialization, empty-element defaults, proxy
+assignment and fixed-value rejection. The C# consumer targets .NET 8 but executes
+on installed .NET 10 with roll-forward; this does not test the minimum runtime.
+The actual CLI-generated Python model also matches the independent value.
+
+## Quality and bounded corpus results
+
+The complete gate passes 327 Rust tests, strict workspace formatting and Clippy,
+Ruff, and 115 Python tests with 100% statement and branch coverage. All seven CLI
+backends pass their emission smoke check; the enum test inherited from #138
+also compiles and executes all seven language consumers.
+
+The first full gate reached Python testing but could not find the CLI it built:
+the helper ignored `CARGO_TARGET_DIR`. It now searches that target and avoids an
+unrelated global CLI when the override is explicit. Three regressions exercise
+absolute/relative targets and building the matching CLI. The smoke script also
+honors the target override. The complete retry passes; both logs are retained.
+
+The companion runner uses the isolated CLI and freshly installed native binding,
+whose paths and SHA-256 hashes are recorded. Its summary and failure tables are
+byte-identical to the entity-fix comparison:
+
+| Sample | Schema expectations passed | Instance round trips passed |
+| --- | ---: | ---: |
+| CType (limit 50; 31 groups available) | 31/31 | 23/28 |
+| AttrDecl (first 50 groups) | 50/50 | 50/50 |
+| NISTXMLSchemaDatatypes (first 100 groups) | 100/100 | 447/452 |
+
+Existing failures remain; these bounded runs do not establish full conformance.
+[Raw verification logs, source probes and hashes](data/runtime-followups-2026-10-03/default-literals/)
+retain the failure preflight and successful retry. Heavy work was serial with
+one Cargo worker under the repository memory cap.
diff --git a/research/runtime-entities-2026-10-03.md b/research/runtime-entities-2026-10-03.md
new file mode 100644
index 0000000..43a7cfb
--- /dev/null
+++ b/research/runtime-entities-2026-10-03.md
@@ -0,0 +1,25 @@
+# XSD attribute decoding and generated enum literals
+
+The runtime investigation exposed an XSD enum declared as `R&amp;D` that rejected an XML value of `R&D`. The schema parser copied raw attribute text into the IR. This also affected facets, default/fixed values, namespace declarations, and QName validation. The UPA pass already normalized attributes, so schema passes could disagree.
+
+Branch `fix/xsd-attribute-values` normalizes attributes consistently with quick-xml’s XML 1.0 normalization API and propagates errors. Built-in and numeric references are decoded once, literal attribute whitespace is normalized, and referenced tabs/newlines/carriage returns survive. Duplicate enum values are removed after decoding. Malformed attributes and undefined references are rejected even inside otherwise skipped annotations. This does not add a custom DTD entity resolver.
+
+Decoding quotes exposed another problem: several generators emitted the resulting value directly inside source string literals. The [saved intermediate Rust output and syntax failure](data/runtime-followups-2026-10-03/entities/decoded-but-unescaped-rust/rust-syntax.log) show that failure. Generated enum constants, metadata attributes, conversion tables and parse matches now use target-appropriate escaping. Rust uses its own string syntax; C++ uses fixed-width octal for ASCII controls; the other targets use JSON-compatible escapes with explicit Unicode line-terminator escaping for C#.
+
+The fixtures are `research/fixtures/schema_attribute_entities.xsd` and `research/fixtures/enum_literal_escaping.xsd`. [An independent lxml validator](data/runtime-followups-2026-10-03/entities/independent-validator.txt) accepted the schema and all four valid entity fixture instances. Core tests check enum/facet/default/fixed values, namespace/QName consistency, normalization, negative constraints and errors. The seven-language test compiles and executes generated consumers, compares values with independent data files, and verifies Rust Serde serialization/deserialization. It includes quotes, backslashes that resemble Unicode escapes, Unicode, tabs, newlines, carriage returns, and Unicode line separators.
+
+[The final quality gate](data/runtime-followups-2026-10-03/entities/quality-gate.txt) passed 326 Rust tests, strict workspace Clippy, Rust formatting, and 112 Python tests with 100% statement and branch coverage. [All seven enum consumers passed](data/runtime-followups-2026-10-03/entities/seven-language-enums.txt). [Toolchain versions](data/runtime-followups-2026-10-03/entities/toolchains.json) include Rust 1.99.0, Python 3.14.4, GCC 15.2, Go 1.26, Java 25, TypeScript 5.9 and .NET 10. The C# consumer targets .NET 8 and uses .NET 10 roll-forward; this does not verify execution on the minimum .NET 8 runtime.
+
+Compiler and generated enum implementation revision: `dc38fde`. Heavy checks used one Cargo worker and the systemd memory cap with swap disabled. Main remains untouched. 
+
+The [isolated companion comparison](data/runtime-followups-2026-10-03/entities/corpus-comparison.json) has identical summaries and failure tables for baseline and candidate:
+
+| Suite | Groups / schema expectations passed | Instance round trips passed |
+| --- | --- | --- |
+| CType, limit 50 | 31 / 31 | 23 / 28 |
+| AttrDecl, limit 50 | 50 / 50 | 50 / 50 |
+| NISTXMLSchemaDatatypes, limit 100 | 100 / 100 | 447 / 452 |
+
+These are selected suites, not full W3C conformance. The six failing groups predate this fix. [Baseline logs](data/runtime-followups-2026-10-03/entities/baseline/CType.txt), [candidate logs](data/runtime-followups-2026-10-03/entities/candidate/CType.txt), and the adjacent AttrDecl/NIST files retain every reported result. [Artifact hashes and discriminating CLI/native probes](data/runtime-followups-2026-10-03/entities/source-artifacts.json) establish the tested sources. The baseline native probe rejects `R&D`; the candidate accepts it and produces correctly decoded defaults/fixed values. [The seven-target CLI smoke passed](data/runtime-followups-2026-10-03/entities/seven-target-smoke.txt) using the isolated candidate executable.
+
+An earlier corpus preflight incorrectly reused another worktree’s top-level CLI in a shared debug target directory. Its source probe caught the mismatch. [That rejected attempt](data/runtime-followups-2026-10-03/entities/rejected-shared-target-preflight/README.txt) is retained and excluded from the comparison above. Rebuilding each revision in its own target directory resolved the problem; the workflow skill now records this requirement.
diff --git a/research/runtime-integration-2026-10-03.md b/research/runtime-integration-2026-10-03.md
new file mode 100644
index 0000000..54ffb35
--- /dev/null
+++ b/research/runtime-integration-2026-10-03.md
@@ -0,0 +1,81 @@
+# XML runtime integration — October 3, 2026
+
+The combined correctness/writer branch passes the full quality gate: **334 Rust
+tests, 115 Python tests, 100% statement/branch wrapper coverage**, strict workspace
+formatting and Clippy, and Ruff. It preserves the large mixed-table speedup while
+ordinary catalog timings remain within roughly 1% of the selected runtime baseline.
+Main remains unchanged.
+
+Measured/tested integration source: `71aff6ca6cbe7106dcc2389a2428571a16d69430`.
+Baseline: `1819c91` from [draft PR #137](https://github.com/polyxml/PolyXML/pull/137).
+This branch combines [#138](https://github.com/polyxml/PolyXML/pull/138) (XSD
+attribute entities/enum literals), [#140](https://github.com/polyxml/PolyXML/pull/140)
+(default/fixed generated literals), [#141](https://github.com/polyxml/PolyXML/pull/141)
+(namespace URI entities), and [#142](https://github.com/polyxml/PolyXML/pull/142)
+(mixed nil round trips and sampled branch lookup). The registry prototype in
+[#139](https://github.com/polyxml/PolyXML/pull/139) and the attribute-guard prototype
+remain separate experiments because their workload tradeoffs need review.
+
+## Long plain-record comparison
+
+Three alternating process pairs, 100 samples, 3-second warmup, 5-second measurement.
+Matched Criterion locks/harness/toolchain; all fixtures validate complete round trips
+before timing. Negative time changes mean faster.
+
+| Consumer | Baseline | Integration | Time change | Process-pair changes |
+| --- | ---: | ---: | ---: | --- |
+| deserialization/catalog_items/1000 | 793.776 us | 791.797 us | -0.25% | -0.11%, -0.31%, -0.78% |
+| deserialization/catalog_items/10000 | 8000.110 us | 7909.081 us | -1.14% | -1.14%, +0.11%, -2.00% |
+| deserialization/sensor_micro | 1.012 us | 1.015 us | +0.30% | +0.59%, +0.69%, +0.30% |
+| serialization/catalog_items/1000 | 177.532 us | 178.628 us | +0.62% | +0.06%, +1.59%, +0.81% |
+| serialization/catalog_items/10000 | 1796.153 us | 1808.383 us | +0.68% | +0.63%, +0.64%, +1.56% |
+| serialization/sensor_micro | 0.227 us | 0.230 us | +1.60% | +1.60%, +1.05%, +1.96% |
+
+These compare with the already-optimized investigation branch, not a release tag.
+The small writer slowdowns are retained; unchanged source paths do not guarantee
+identical whole-binary timing. The sensor writer difference is roughly 4 ns.
+
+## Mixed table integration screen
+
+Two process pairs, 50 samples, 1-second warmup, 2-second measurement, 1,000 items.
+This is an integration check; the individual writer report retains its longer
+three-pair comparison and concentrated, text-heavy, cutoff and power-of-two controls.
+
+| Possible tags | Time change | Process-pair changes |
+| --- | ---: | --- |
+| branches_1 | -5.13% | -4.00%, -6.27% |
+| branches_16 | -5.74% | -5.66%, -5.83% |
+| branches_256 | -54.39% | -53.95%, -54.84% |
+| branches_64 | -29.17% | -28.26%, -30.06% |
+
+The combined branch retains the large-table improvement in both pairs. Sampling
+and temporary indexing are performance heuristics, with no persistent metadata
+cache. Scalar/nested mixed nils preserve order and correct namespace bindings.
+Existing mixed metadata omits nillability constraints; this does not add full
+schema validation or claim full namespace/W3C conformance.
+
+## Installed artifacts and bounded corpus
+
+Fresh CLI/native probes pass for generated default/fixed values, schema attribute
+entities, escaped namespace URIs, and a mixed nil XML → JSON → XML round trip.
+[The probe](data/runtime-followups-2026-10-03/integration/probe.json) records both
+artifact hashes and the imported module path. Worktree-owned build targets and
+matching companion bindings avoid stale CLI/native aliases.
+
+Bounded W3C results have byte-identical summary/failure tables to the default-literal
+candidate: CType 31/31 schemas and 23/28 instances; AttrDecl 50/50 schemas and
+50/50 instances; NIST 100/100 schemas and 447/452 instances. The six existing
+failing groups remain. These selected suites do not establish full conformance.
+
+## Evidence and limits
+
+[Evidence](data/runtime-followups-2026-10-03/integration/) includes matched locks,
+harnesses, all Criterion samples, confidence intervals, the full gate, corpus logs,
+artifact probes and commands. Criterion JSON directories are retained in verified
+archives with original member checksums; extract into scratch beside metadata.json
+to rerun summarize.py. Top-level SHA256SUMS verifies the delivered files.
+
+Heavy work ran serially with one Cargo worker and the systemd memory cap. No OOM
+occurred. Results describe this WSL2 host; requested allocator bytes and latency
+measurements are not peak RAM or concurrent throughput. Later commits package
+evidence and documentation without changing the measured core sources.
diff --git a/research/runtime-mixed-writer-2026-10-03.md b/research/runtime-mixed-writer-2026-10-03.md
new file mode 100644
index 0000000..aea9a5f
--- /dev/null
+++ b/research/runtime-mixed-writer-2026-10-03.md
@@ -0,0 +1,213 @@
+# Mixed XML writer investigation — October 3, 2026
+
+Final implementation `58cb346`; initial prototype `6965d33` with harness `d3bf172`,
+compared with selected runtime baseline `1819c91` (draft PR #137). Main is unchanged.
+
+The selected writer fixes mixed nil round trips and accelerates distributed
+large-table writes by 31% (64 tags) and 55% (256 tags) in the final longer run.
+A sampled selector avoids the measured short/concentrated-payload regressions
+of the initial index. The final results are below under “Final selector”; earlier
+sections preserve the prototypes and their failures. Tiny-document differences
+and process variance remain explicit. Main is unchanged.
+
+## Correctness
+
+The reader produced tagged nulls for present mixed elements carrying xsi:nil,
+but the writer rejected those values. Emit a present nil element for scalar and
+nested branches, preserving order and the distinction from an empty string.
+Bind the instance namespace locally, avoiding shadowing the element QName prefix.
+Independent namespace-aware output checks cover default/custom prefixes and
+namespace-disabled output. Mixed branch metadata currently omits nillability
+constraints; this fix preserves the dynamic reader's existing permissive behavior.
+
+## Algorithm
+
+The previous writer searched every mixed branch for each tagged item. For sufficiently large tables/payloads and sampled costly lookups,
+build a temporary borrowed-key hash index once per container. Smaller cases retain linear search. Select the lookup once before
+the loop. The index borrows metadata, preserves the first match for duplicate
+variant names, and is rebuilt each write so public metadata edits remain visible.
+A regression exercises indexed nulls, objects, records, duplicate names, metadata
+mutation and invalid kinds. This adds no persistent cache or public schema fields.
+
+## Initial long branch-table comparison (`6965d33`)
+
+Three alternating process pairs, 100 samples, 3-second warmup, 5-second measurement.
+Fixtures validate every integer/kind and complete ordered round trips before timing.
+
+| Possible child tags | Items | Baseline | Candidate | Time change |
+| ---: | ---: | ---: | ---: | ---: |
+| 1 | 1,000 | 64.850 us | 59.922 us | -7.60% |
+| 16 | 1,000 | 69.575 us | 65.136 us | -6.38% |
+| 64 | 1,000 | 99.859 us | 73.502 us | -26.39% |
+| 256 | 1,000 | 169.214 us | 78.286 us | -53.74% |
+
+These measure the complete nil/factored-loop/index candidate. Small-table gains
+cannot be attributed to the hash index because those cases retain linear search.
+
+## Rejected and diagnostic attempts
+
+The first nil implementation's scalar/pattern timing changed substantially between
+short and longer runs. A cold nil helper removed hot-path guards and two nil-only
+string allocations, but scalar process pairs still varied. Even pinning to CPU 4
+gave +17.34%, -1.56% and +2.18%; a median alone obscures that instability.
+
+A valid Callgrind run over 25 warm writes reported scalar instructions down 2.58%
+and pattern instructions up 0.25% for the cold-helper prototype. Simulated
+instructions are not cycles or latency. The first profile missed the measured
+marker and collected zero; it is retained as a rejected attempt.
+
+A shared workspace debug target also supplied a stale test executable for the
+factored-loop prototype. Its missing helper symbols exposed the mismatch. The
+same source passed in a worktree-owned target; both preflight logs are retained.
+Standalone timing consumers use separate baseline/current targets and explicit
+source dependencies. All heavy runs are serial, one Cargo worker, under the
+systemd memory cap. Results describe this WSL2 host, not concurrent throughput.
+
+## Initial sparse and read screen (`6965d33`)
+
+Two process pairs, 50 samples, 1-second warmup, 2-second measurement. One-item
+writes changed +3.42%, +2.31%, +4.19% and +2.72% for 1/16/64/256 branches,
+respectively (roughly 3–6 ns slower). One-item reads range from -1.62% to +0.81%;
+1,000-item reads range from -1.00% to +2.77%. This writer optimization does not
+establish improved read speed or better latency for tiny documents. Retain these
+controls alongside the larger write gains; the short screen is not precise enough
+to attribute small read changes to a particular source change.
+
+## Initial common mixed-content controls (`6965d33`)
+
+Same long-run settings as the branch-table comparison.
+
+| 1,000-item writer | Time change | Process-pair changes |
+| --- | ---: | --- |
+| enum | -3.34% | -2.80%, -3.74%, -1.75% |
+| nested | +1.71% | +1.71%, -0.68%, +2.99% |
+| pattern | -1.66% | -2.44%, -1.66%, +10.07% |
+| scalar | -0.59% | -1.23%, -1.64%, +10.77% |
+| text | -2.32% | -2.98%, -1.48%, -1.78% |
+
+These small changes do not establish a universal mixed-content speedup. The large
+branch-table result is the principal performance finding. Nested writes retain a
+small measured slowdown; scalar writes are roughly flat in this comparison.
+
+## Initial plain-record screen (`6965d33`)
+
+Two process pairs with the short-screen settings.
+
+| Consumer | Time change |
+| --- | ---: |
+| deserialization/catalog_items/1000 | +0.49% |
+| deserialization/catalog_items/10000 | +0.29% |
+| deserialization/sensor_micro | +3.29% |
+| serialization/catalog_items/1000 | -2.04% |
+| serialization/catalog_items/10000 | -0.83% |
+| serialization/sensor_micro | -0.79% |
+
+Ordinary catalog parsing is roughly flat. The tiny sensor read is about 33 ns
+slower; writer source changes do not guarantee unchanged whole-binary read timing.
+
+## Initial allocation diagnostics (`6965d33`)
+
+A counting allocator surrounds one warmed write, using the exact branch-table
+fixture. Sparse writes and the 1/16-branch large cases match baseline allocations.
+The 64-branch/1,000-item case adds one allocation and 3,216 requested bytes;
+256 branches add one allocation and 12,816 requested bytes. Output bytes and
+buffer reallocations match. Keys borrow existing strings. Requested bytes are
+cumulative allocator requests, not peak or retained memory. The table is dropped
+after each container write.
+
+## Crossover correction
+
+The initial 64-item trigger (`6965d33`) was too eager for large tables. A short
+32/64/128-item screen found 256 branches with 64 items 30.45% slower, despite
+being 16.56% faster at 128 items and 53.74% faster at 1,000. With 64 branches,
+64 and 128 items improved 14.76% and 22.64%. The final trigger additionally
+requires at least half as many items as branches. This avoids building a large
+index for the observed short-document loss. The heuristic is workload dependent;
+text-only content and repeatedly using an early branch can save less lookup work.
+The initial source's full gate and all measurements remain archived as provenance.
+
+## Distribution-aware selection
+
+A size-only trigger still slowed 1,000 repeated first-tag writes by 11.20%
+(64 branches) and 19.88% (256). Sample up to 16 items across the payload before
+indexing: require four tagged samples and average linear search depth of 16.
+Text samples and low-cost early-tag reuse retain linear lookup. Normal validation
+still processes every item. Offsets inside the sample bins avoid repeatedly
+sampling one tag when a choice cycle divides the stride; 1,024-item controls
+check that common power-of-two case. Sampling is bounded and deterministic,
+with no allocation. It can miss other distributions, so this remains a heuristic.
+
+## Final selector (`58cb346`)
+
+Three process pairs, 100 samples, 3-second warmup, 5-second measurement.
+
+| 1,000-item writer | Baseline | Candidate | Time change | Process-pair changes |
+| --- | ---: | ---: | ---: | --- |
+| branches_1 | 64.841 us | 61.384 us | -5.33% | -6.57%, -3.85%, -7.98% |
+| branches_16 | 70.082 us | 65.587 us | -6.41% | -6.09%, -6.41%, -12.35% |
+| branches_256 | 176.588 us | 79.247 us | -55.12% | -54.79%, -54.88%, -57.18% |
+| branches_64 | 106.933 us | 73.844 us | -30.94% | -29.58%, -30.94%, -31.45% |
+
+The 64/256-branch cases improve in every pair. The source retains linear search
+for small tables, so their improvement belongs to the complete writer change,
+not the index alone. Final concentrated first-tag screens improve 3.67% and
+2.44% with 64/256 branches, respectively. Power-of-two distributed screens
+improve 26.64% and 54.44%. Text-heavy content with 261 possible branches is
+roughly flat (-1.73%). These controls use the shorter two-pair settings.
+
+### Final common-content comparison
+
+Same long-run settings as the final branch-table comparison.
+
+| 1,000-item writer | Time change | Process-pair changes |
+| --- | ---: | --- |
+| enum | -4.47% | -3.42%, -6.94%, -3.58% |
+| nested | -2.01% | -2.71%, -1.41%, -1.69% |
+| pattern | -5.40% | -5.86%, -5.40%, -5.54% |
+| scalar | -1.85% | -12.49%, -1.85%, +0.89% |
+| text | -5.11% | -5.31%, -3.96%, -5.04% |
+
+These are complete writer-binary results, with process variation retained above.
+No hash table is used for these five-branch fixtures. Earlier prototypes did
+show small regressions; keep their evidence instead of replacing the history
+with only this favorable final run. Tiny sparse writes still differ by a few
+nanoseconds. Read controls remain roughly flat, not a claimed read optimization.
+
+### Final plain-record screen
+
+Two pairs, 50 samples, 1-second warmup, 2-second measurement.
+
+| Consumer | Time change |
+| --- | ---: |
+| deserialization/catalog_items/1000 | -0.53% |
+| deserialization/catalog_items/10000 | +1.05% |
+| deserialization/sensor_micro | +0.58% |
+| serialization/catalog_items/1000 | -1.01% |
+| serialization/catalog_items/10000 | -1.76% |
+| serialization/sensor_micro | -3.75% |
+
+The final allocation rerun matches the initial counts and table-size costs;
+sampling adds no allocation. These are single-host latency measurements.
+They do not establish concurrent throughput or a compiled-schema memory budget.
+
+## Verification and evidence
+
+The complete final quality gate passes: 324 Rust tests, strict workspace formatting
+and Clippy, Ruff, and 112 Python tests with 100% statement and branch coverage.
+The worktree-owned target is `target/followup-mixed-index-verification` in the
+primary checkout. Compiler/toolchain consumer tests run as part of the full gate.
+
+[Raw evidence](data/runtime-followups-2026-10-03/mixed-writer/) includes every
+Criterion sample and per-process confidence interval, matching locks/harnesses,
+allocation diagnostics, source patches for each prototype, instruction profiles,
+both final/initial gates and the rejected preflights. SHA256SUMS covers all files.
+The final selector is `58cb346`; historical sections identify their older source.
+All heavy work ran serially under the memory cap with one Cargo worker.
+
+Criterion process directories are stored in each experiment's
+`criterion-results.tar.gz` to keep thousands of small JSON files out of the code
+diff. `criterion-SHA256SUMS` records every original path and checksum. Packaging
+checked the original manifest, then read the archive back and verified every
+member before removing the loose copies. Extract into a scratch directory with
+the adjacent metadata.json to rerun summarize.py; all original raw bytes remain.
+The verified packaging script is retained as archive-criterion.py.txt.
diff --git a/research/runtime-namespace-entities-2026-10-03.md b/research/runtime-namespace-entities-2026-10-03.md
new file mode 100644
index 0000000..ac6c35e
--- /dev/null
+++ b/research/runtime-namespace-entities-2026-10-03.md
@@ -0,0 +1,22 @@
+# Namespace URI decoding — October 3, 2026
+
+Source: `ad9282e`, compared with runtime investigation baseline `1819c91`.
+
+Namespace declarations previously retained escaped XML source text. The URI
+`urn:A&amp;B` therefore failed to match the schema URI `urn:A&B`, affecting
+strict root matching and xsi:type dispatch. Decode declaration values once,
+propagate errors, and preserve inherited bindings that are already decoded.
+
+Four regressions cover default and prefixed roots, full round trips, local and
+inherited xsi:type bindings, streamed Start/Empty records, double decoding and
+undefined entities. The original three positive regressions fail on the baseline.
+This is a namespace URI decoding fix, not a claim of full namespace conformance.
+
+Builds and tests use a dedicated workspace target with one Cargo worker and the
+repository systemd memory cap. See the retained evidence for exact commands and
+results. No compiler or generated-model behavior changes are included.
+
+The complete quality gate passes: 325 Rust tests, strict workspace formatting
+and Clippy, Ruff, and 112 Python tests with 100% statement and branch coverage.
+Raw baseline failures, focused checks and the full gate are retained in
+[the evidence directory](data/runtime-followups-2026-10-03/namespace-entities/).
diff --git a/scripts/verify_codegen.sh b/scripts/verify_codegen.sh
index cb2b33c..608824c 100755
--- a/scripts/verify_codegen.sh
+++ b/scripts/verify_codegen.sh
@@ -18,7 +18,7 @@ NC='\033[0m'
 
 echo -e "${BLUE}==> Building polyxml CLI binary...${NC}"
 cargo build -p polyxml-cli --quiet
-POLYXML_BIN="${REPO_ROOT}/target/debug/polyxml"
+POLYXML_BIN="${CARGO_TARGET_DIR:-${REPO_ROOT}/target}/debug/polyxml"
 
 TMP_DIR="$(mktemp -d -t polyxml-smoke-XXXXXX)"
 trap 'rm -rf "${TMP_DIR}"' EXIT