diff --git a/Include/internal/pycore_modsupport.h b/Include/internal/pycore_modsupport.h
index d90f42e9cd8b071..f817d86a5289839 100644
--- a/Include/internal/pycore_modsupport.h
+++ b/Include/internal/pycore_modsupport.h
@@ -10,7 +10,8 @@ extern "C" {
 #endif
 
 
-extern int _PyArg_NoKwnames(const char *funcname, PyObject *kwnames);
+// Export for 'array' shared extension
+PyAPI_FUNC(int) _PyArg_NoKwnames(const char *funcname, PyObject *kwnames);
 #define _PyArg_NoKwnames(funcname, kwnames) \
     ((kwnames) == NULL || _PyArg_NoKwnames((funcname), (kwnames)))
 
diff --git a/Lib/test/clinic.test.c b/Lib/test/clinic.test.c
index cd7a4b0396d08fc..8d3fa8d63b7ee37 100644
--- a/Lib/test/clinic.test.c
+++ b/Lib/test/clinic.test.c
@@ -6002,23 +6002,13 @@ static PyObject *
 Test__pyarg_parsestackandkeywords(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .format = "s#:_pyarg_parsestackandkeywords",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
     const char *key;
     Py_ssize_t key_length;
 
-    if (!_PyArg_ParseStackAndKeywords(args, nargs, kwnames, &_parser,
+    if (!_PyArg_NoKwnames("_pyarg_parsestackandkeywords", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_ParseStack(args, nargs, "s#:_pyarg_parsestackandkeywords",
         &key, &key_length)) {
         goto exit;
     }
@@ -6032,7 +6022,7 @@ static PyObject *
 Test__pyarg_parsestackandkeywords_impl(TestObj *self, PyTypeObject *cls,
                                        const char *key,
                                        Py_ssize_t key_length)
-/*[clinic end generated code: output=7060c213d7b8200e input=fc72ef4b4cfafabc]*/
+/*[clinic end generated code: output=21bbb9a8d0100d72 input=fc72ef4b4cfafabc]*/
 
 
 /*[clinic input]
diff --git a/Lib/test/test_clinic.py b/Lib/test/test_clinic.py
index 20da30f445d28c7..fcffebea38e10b9 100644
--- a/Lib/test/test_clinic.py
+++ b/Lib/test/test_clinic.py
@@ -4898,7 +4898,7 @@ def test_defclass_posonly_varpos(self):
         cls = ac_tester.TestClass
         obj = cls()
         fn = obj.defclass_posonly_varpos
-        errmsg = 'takes at least 2 positional arguments'
+        errmsg = 'expected at least 2 arguments'
         self.assertRaisesRegex(TypeError, errmsg, fn)
         self.assertRaisesRegex(TypeError, errmsg, fn, 1)
         self.assertEqual(fn(1, 2), (cls, 1, 2, ()))
diff --git a/Lib/test/test_sqlite3/test_hooks.py b/Lib/test/test_sqlite3/test_hooks.py
index 7e5117771b379f5..a9373df4d70417d 100644
--- a/Lib/test/test_sqlite3/test_hooks.py
+++ b/Lib/test/test_sqlite3/test_hooks.py
@@ -450,7 +450,7 @@ def test_trace_bad_handler(self):
 
     def test_set_trace_callback_keyword_args(self):
         with self.assertRaisesRegex(TypeError,
-                'takes exactly 1 positional argument'):
+                'takes no keyword arguments'):
             self.con.set_trace_callback(trace_callback=lambda: None)
 
     # When a handler has an invalid signature, the exception raised is
diff --git a/Lib/test/test_sqlite3/test_userfunctions.py b/Lib/test/test_sqlite3/test_userfunctions.py
index 11cf877a011c785..fdfc14d49d601ce 100644
--- a/Lib/test/test_sqlite3/test_userfunctions.py
+++ b/Lib/test/test_sqlite3/test_userfunctions.py
@@ -720,7 +720,7 @@ def test_aggr_text(self):
 
     def test_agg_keyword_args(self):
         with self.assertRaisesRegex(TypeError,
-                'takes exactly 3 positional arguments'):
+                'takes no keyword arguments'):
             self.con.create_aggregate("test", 1, aggregate_class=AggrText)
 
 
@@ -767,7 +767,7 @@ def test_clear_authorizer(self):
 
     def test_authorizer_keyword_args(self):
         with self.assertRaisesRegex(TypeError,
-                'takes exactly 1 positional argument'):
+                'takes no keyword arguments'):
             self.con.set_authorizer(authorizer_callback=lambda: None)
 
 
diff --git a/Misc/NEWS.d/next/Core_and_Builtins/2026-05-15-20-13-41.gh-issue-136681.4Lso8S.rst b/Misc/NEWS.d/next/Core_and_Builtins/2026-05-15-20-13-41.gh-issue-136681.4Lso8S.rst
new file mode 100644
index 000000000000000..924a89effee132a
--- /dev/null
+++ b/Misc/NEWS.d/next/Core_and_Builtins/2026-05-15-20-13-41.gh-issue-136681.4Lso8S.rst
@@ -0,0 +1,2 @@
+Argument Clinic now parses arguments of positional-only methods with a
+*defining class* directly, without a :c:type:`!_PyArg_Parser`.
diff --git a/Modules/_ctypes/clinic/_ctypes.c.h b/Modules/_ctypes/clinic/_ctypes.c.h
index 221b110cd15d2de..cd71c90f63b88e7 100644
--- a/Modules/_ctypes/clinic/_ctypes.c.h
+++ b/Modules/_ctypes/clinic/_ctypes.c.h
@@ -2,12 +2,9 @@
 preserve
 [clinic start generated code]*/
 
-#if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-#  include "pycore_runtime.h"     // _Py_SINGLETON()
-#endif
 #include "pycore_abstract.h"      // _PyNumber_Index()
 #include "pycore_critical_section.h"// Py_BEGIN_CRITICAL_SECTION()
-#include "pycore_modsupport.h"    // _PyArg_UnpackKeywords()
+#include "pycore_modsupport.h"    // _PyArg_CheckPositional()
 
 PyDoc_STRVAR(_ctypes_CType_Type___sizeof____doc__,
 "__sizeof__($self, /)\n"
@@ -92,25 +89,12 @@ static PyObject *
 CDataType_from_address(PyObject *type, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "from_address",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *value;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("from_address", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("from_address", nargs, 1, 1)) {
         goto exit;
     }
     value = args[0];
@@ -139,31 +123,18 @@ static PyObject *
 CDataType_from_buffer(PyObject *type, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "from_buffer",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
     PyObject *obj;
     Py_ssize_t offset = 0;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("from_buffer", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("from_buffer", nargs, 1, 2)) {
         goto exit;
     }
     obj = args[0];
     if (nargs < 2) {
-        goto skip_optional_posonly;
+        goto skip_optional;
     }
     {
         Py_ssize_t ival = -1;
@@ -182,7 +153,7 @@ CDataType_from_buffer(PyObject *type, PyTypeObject *cls, PyObject *const *args,
             goto exit;
         }
     }
-skip_optional_posonly:
+skip_optional:
     return_value = CDataType_from_buffer_impl(type, cls, obj, offset);
 
 exit:
@@ -208,33 +179,20 @@ static PyObject *
 CDataType_from_buffer_copy(PyObject *type, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "from_buffer_copy",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
     Py_buffer buffer = {NULL, NULL};
     Py_ssize_t offset = 0;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("from_buffer_copy", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("from_buffer_copy", nargs, 1, 2)) {
         goto exit;
     }
     if (PyObject_GetBuffer(args[0], &buffer, PyBUF_SIMPLE) != 0) {
         goto exit;
     }
     if (nargs < 2) {
-        goto skip_optional_posonly;
+        goto skip_optional;
     }
     {
         Py_ssize_t ival = -1;
@@ -253,7 +211,7 @@ CDataType_from_buffer_copy(PyObject *type, PyTypeObject *cls, PyObject *const *a
             goto exit;
         }
     }
-skip_optional_posonly:
+skip_optional:
     return_value = CDataType_from_buffer_copy_impl(type, cls, &buffer, offset);
 
 exit:
@@ -284,26 +242,13 @@ static PyObject *
 CDataType_in_dll(PyObject *type, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "in_dll",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
     PyObject *dll;
     const char *name;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 2, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("in_dll", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("in_dll", nargs, 2, 2)) {
         goto exit;
     }
     dll = args[0];
@@ -342,25 +287,12 @@ static PyObject *
 CDataType_from_param(PyObject *type, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "from_param",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *value;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("from_param", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("from_param", nargs, 1, 1)) {
         goto exit;
     }
     value = args[0];
@@ -386,25 +318,12 @@ static PyObject *
 PyCPointerType_set_type(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "set_type",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *type;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("set_type", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("set_type", nargs, 1, 1)) {
         goto exit;
     }
     type = args[0];
@@ -431,25 +350,12 @@ static PyObject *
 PyCPointerType_from_param(PyObject *type, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "from_param",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *value;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("from_param", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("from_param", nargs, 1, 1)) {
         goto exit;
     }
     value = args[0];
@@ -580,25 +486,12 @@ static PyObject *
 c_wchar_p_from_param(PyObject *type, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "from_param",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *value;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("from_param", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("from_param", nargs, 1, 1)) {
         goto exit;
     }
     value = args[0];
@@ -623,25 +516,12 @@ static PyObject *
 c_char_p_from_param(PyObject *type, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "from_param",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *value;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("from_param", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("from_param", nargs, 1, 1)) {
         goto exit;
     }
     value = args[0];
@@ -666,25 +546,12 @@ static PyObject *
 c_void_p_from_param(PyObject *type, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "from_param",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *value;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("from_param", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("from_param", nargs, 1, 1)) {
         goto exit;
     }
     value = args[0];
@@ -711,25 +578,12 @@ static PyObject *
 PyCSimpleType_from_param(PyObject *type, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "from_param",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *value;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("from_param", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("from_param", nargs, 1, 1)) {
         goto exit;
     }
     value = args[0];
@@ -1058,4 +912,4 @@ Simple_from_outparm(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py
     }
     return Simple_from_outparm_impl(self, cls);
 }
-/*[clinic end generated code: output=b89feb50c654de3f input=a9049054013a1b77]*/
+/*[clinic end generated code: output=a84771bcd97a41cd input=a9049054013a1b77]*/
diff --git a/Modules/_decimal/clinic/_decimal.c.h b/Modules/_decimal/clinic/_decimal.c.h
index 8ad883d8a2d14dc..99b923d4934db6d 100644
--- a/Modules/_decimal/clinic/_decimal.c.h
+++ b/Modules/_decimal/clinic/_decimal.c.h
@@ -734,25 +734,12 @@ static PyObject *
 _decimal_Decimal_from_float(PyObject *type, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "from_float",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *pyfloat;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("from_float", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("from_float", nargs, 1, 1)) {
         goto exit;
     }
     pyfloat = args[0];
@@ -786,25 +773,12 @@ static PyObject *
 _decimal_Decimal_from_number(PyObject *type, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "from_number",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *number;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("from_number", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("from_number", nargs, 1, 1)) {
         goto exit;
     }
     number = args[0];
@@ -835,25 +809,12 @@ static PyObject *
 _decimal_Context_create_decimal_from_float(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "create_decimal_from_float",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *f;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("create_decimal_from_float", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("create_decimal_from_float", nargs, 1, 1)) {
         goto exit;
     }
     f = args[0];
@@ -989,26 +950,13 @@ static PyObject *
 _decimal_Decimal___format__(PyObject *dec, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "__format__",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
     PyObject *fmtarg;
     PyObject *override = NULL;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("__format__", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("__format__", nargs, 1, 2)) {
         goto exit;
     }
     if (!PyUnicode_Check(args[0])) {
@@ -1017,10 +965,10 @@ _decimal_Decimal___format__(PyObject *dec, PyTypeObject *cls, PyObject *const *a
     }
     fmtarg = args[0];
     if (nargs < 2) {
-        goto skip_optional_posonly;
+        goto skip_optional;
     }
     override = args[1];
-skip_optional_posonly:
+skip_optional:
     return_value = _decimal_Decimal___format___impl(dec, cls, fmtarg, override);
 
 exit:
@@ -1296,32 +1244,19 @@ static PyObject *
 _decimal_Decimal___round__(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "__round__",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *ndigits = NULL;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 0, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("__round__", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("__round__", nargs, 0, 1)) {
         goto exit;
     }
     if (nargs < 1) {
-        goto skip_optional_posonly;
+        goto skip_optional;
     }
     ndigits = args[0];
-skip_optional_posonly:
+skip_optional:
     return_value = _decimal_Decimal___round___impl(self, cls, ndigits);
 
 exit:
@@ -4128,25 +4063,12 @@ static PyObject *
 _decimal_Context_abs(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "abs",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *x;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("abs", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("abs", nargs, 1, 1)) {
         goto exit;
     }
     x = args[0];
@@ -4172,25 +4094,12 @@ static PyObject *
 _decimal_Context_exp(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "exp",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *x;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("exp", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("exp", nargs, 1, 1)) {
         goto exit;
     }
     x = args[0];
@@ -4216,25 +4125,12 @@ static PyObject *
 _decimal_Context_ln(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "ln",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *x;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("ln", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("ln", nargs, 1, 1)) {
         goto exit;
     }
     x = args[0];
@@ -4261,25 +4157,12 @@ static PyObject *
 _decimal_Context_log10(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "log10",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *x;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("log10", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("log10", nargs, 1, 1)) {
         goto exit;
     }
     x = args[0];
@@ -4308,25 +4191,12 @@ static PyObject *
 _decimal_Context_minus(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "minus",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *x;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("minus", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("minus", nargs, 1, 1)) {
         goto exit;
     }
     x = args[0];
@@ -4353,25 +4223,12 @@ static PyObject *
 _decimal_Context_next_minus(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "next_minus",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *x;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("next_minus", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("next_minus", nargs, 1, 1)) {
         goto exit;
     }
     x = args[0];
@@ -4398,25 +4255,12 @@ static PyObject *
 _decimal_Context_next_plus(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "next_plus",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *x;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("next_plus", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("next_plus", nargs, 1, 1)) {
         goto exit;
     }
     x = args[0];
@@ -4443,25 +4287,12 @@ static PyObject *
 _decimal_Context_normalize(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "normalize",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *x;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("normalize", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("normalize", nargs, 1, 1)) {
         goto exit;
     }
     x = args[0];
@@ -4489,25 +4320,12 @@ static PyObject *
 _decimal_Context_plus(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "plus",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *x;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("plus", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("plus", nargs, 1, 1)) {
         goto exit;
     }
     x = args[0];
@@ -4534,25 +4352,12 @@ static PyObject *
 _decimal_Context_to_integral_value(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "to_integral_value",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *x;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("to_integral_value", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("to_integral_value", nargs, 1, 1)) {
         goto exit;
     }
     x = args[0];
@@ -4579,25 +4384,12 @@ static PyObject *
 _decimal_Context_to_integral_exact(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "to_integral_exact",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *x;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("to_integral_exact", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("to_integral_exact", nargs, 1, 1)) {
         goto exit;
     }
     x = args[0];
@@ -4624,25 +4416,12 @@ static PyObject *
 _decimal_Context_to_integral(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "to_integral",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *x;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("to_integral", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("to_integral", nargs, 1, 1)) {
         goto exit;
     }
     x = args[0];
@@ -4668,25 +4447,12 @@ static PyObject *
 _decimal_Context_sqrt(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "sqrt",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *x;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("sqrt", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("sqrt", nargs, 1, 1)) {
         goto exit;
     }
     x = args[0];
@@ -4713,26 +4479,13 @@ static PyObject *
 _decimal_Context_add(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
+    PyObject *x;
+    PyObject *y;
 
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "add",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
-    PyObject *x;
-    PyObject *y;
-
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 2, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("add", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("add", nargs, 2, 2)) {
         goto exit;
     }
     x = args[0];
@@ -4760,26 +4513,13 @@ static PyObject *
 _decimal_Context_compare(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "compare",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
     PyObject *x;
     PyObject *y;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 2, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("compare", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("compare", nargs, 2, 2)) {
         goto exit;
     }
     x = args[0];
@@ -4807,26 +4547,13 @@ static PyObject *
 _decimal_Context_compare_signal(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "compare_signal",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
     PyObject *x;
     PyObject *y;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 2, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("compare_signal", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("compare_signal", nargs, 2, 2)) {
         goto exit;
     }
     x = args[0];
@@ -4854,26 +4581,13 @@ static PyObject *
 _decimal_Context_divide(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "divide",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
     PyObject *x;
     PyObject *y;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 2, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("divide", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("divide", nargs, 2, 2)) {
         goto exit;
     }
     x = args[0];
@@ -4901,26 +4615,13 @@ static PyObject *
 _decimal_Context_divide_int(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "divide_int",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
     PyObject *x;
     PyObject *y;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 2, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("divide_int", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("divide_int", nargs, 2, 2)) {
         goto exit;
     }
     x = args[0];
@@ -4948,26 +4649,13 @@ static PyObject *
 _decimal_Context_max(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "max",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
     PyObject *x;
     PyObject *y;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 2, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("max", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("max", nargs, 2, 2)) {
         goto exit;
     }
     x = args[0];
@@ -4995,26 +4683,13 @@ static PyObject *
 _decimal_Context_max_mag(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "max_mag",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
     PyObject *x;
     PyObject *y;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 2, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("max_mag", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("max_mag", nargs, 2, 2)) {
         goto exit;
     }
     x = args[0];
@@ -5042,26 +4717,13 @@ static PyObject *
 _decimal_Context_min(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "min",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
     PyObject *x;
     PyObject *y;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 2, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("min", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("min", nargs, 2, 2)) {
         goto exit;
     }
     x = args[0];
@@ -5089,26 +4751,13 @@ static PyObject *
 _decimal_Context_min_mag(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "min_mag",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
     PyObject *x;
     PyObject *y;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 2, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("min_mag", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("min_mag", nargs, 2, 2)) {
         goto exit;
     }
     x = args[0];
@@ -5136,26 +4785,13 @@ static PyObject *
 _decimal_Context_multiply(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "multiply",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
     PyObject *x;
     PyObject *y;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 2, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("multiply", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("multiply", nargs, 2, 2)) {
         goto exit;
     }
     x = args[0];
@@ -5183,26 +4819,13 @@ static PyObject *
 _decimal_Context_next_toward(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "next_toward",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
     PyObject *x;
     PyObject *y;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 2, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("next_toward", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("next_toward", nargs, 2, 2)) {
         goto exit;
     }
     x = args[0];
@@ -5230,26 +4853,13 @@ static PyObject *
 _decimal_Context_quantize(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "quantize",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
     PyObject *x;
     PyObject *y;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 2, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("quantize", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("quantize", nargs, 2, 2)) {
         goto exit;
     }
     x = args[0];
@@ -5280,26 +4890,13 @@ static PyObject *
 _decimal_Context_remainder(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "remainder",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
     PyObject *x;
     PyObject *y;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 2, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("remainder", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("remainder", nargs, 2, 2)) {
         goto exit;
     }
     x = args[0];
@@ -5330,26 +4927,13 @@ static PyObject *
 _decimal_Context_remainder_near(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "remainder_near",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
     PyObject *x;
     PyObject *y;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 2, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("remainder_near", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("remainder_near", nargs, 2, 2)) {
         goto exit;
     }
     x = args[0];
@@ -5377,26 +4961,13 @@ static PyObject *
 _decimal_Context_subtract(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "subtract",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
     PyObject *x;
     PyObject *y;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 2, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("subtract", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("subtract", nargs, 2, 2)) {
         goto exit;
     }
     x = args[0];
@@ -5537,27 +5108,14 @@ static PyObject *
 _decimal_Context_fma(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "fma",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[3];
     PyObject *x;
     PyObject *y;
     PyObject *z;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 3, /*maxpos*/ 3, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("fma", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("fma", nargs, 3, 3)) {
         goto exit;
     }
     x = args[0];
@@ -5608,25 +5166,12 @@ static PyObject *
 _decimal_Context_is_normal(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "is_normal",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *x;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("is_normal", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("is_normal", nargs, 1, 1)) {
         goto exit;
     }
     x = args[0];
@@ -5653,25 +5198,12 @@ static PyObject *
 _decimal_Context_is_subnormal(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "is_subnormal",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *x;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("is_subnormal", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("is_subnormal", nargs, 1, 1)) {
         goto exit;
     }
     x = args[0];
@@ -5698,28 +5230,15 @@ static PyObject *
 _decimal_Context_is_finite(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "is_finite",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *x;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("is_finite", kwnames)) {
         goto exit;
     }
-    x = args[0];
+    if (!_PyArg_CheckPositional("is_finite", nargs, 1, 1)) {
+        goto exit;
+    }
+    x = args[0];
     return_value = _decimal_Context_is_finite_impl(context, cls, x);
 
 exit:
@@ -5743,25 +5262,12 @@ static PyObject *
 _decimal_Context_is_infinite(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "is_infinite",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *x;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("is_infinite", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("is_infinite", nargs, 1, 1)) {
         goto exit;
     }
     x = args[0];
@@ -5788,25 +5294,12 @@ static PyObject *
 _decimal_Context_is_nan(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "is_nan",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *x;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("is_nan", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("is_nan", nargs, 1, 1)) {
         goto exit;
     }
     x = args[0];
@@ -5833,25 +5326,12 @@ static PyObject *
 _decimal_Context_is_qnan(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "is_qnan",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *x;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("is_qnan", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("is_qnan", nargs, 1, 1)) {
         goto exit;
     }
     x = args[0];
@@ -5878,25 +5358,12 @@ static PyObject *
 _decimal_Context_is_snan(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "is_snan",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *x;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("is_snan", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("is_snan", nargs, 1, 1)) {
         goto exit;
     }
     x = args[0];
@@ -5923,25 +5390,12 @@ static PyObject *
 _decimal_Context_is_signed(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "is_signed",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *x;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("is_signed", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("is_signed", nargs, 1, 1)) {
         goto exit;
     }
     x = args[0];
@@ -5968,25 +5422,12 @@ static PyObject *
 _decimal_Context_is_zero(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "is_zero",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *x;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("is_zero", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("is_zero", nargs, 1, 1)) {
         goto exit;
     }
     x = args[0];
@@ -6013,25 +5454,12 @@ static PyObject *
 _decimal_Context_is_canonical(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "is_canonical",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *x;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("is_canonical", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("is_canonical", nargs, 1, 1)) {
         goto exit;
     }
     x = args[0];
@@ -6058,25 +5486,12 @@ static PyObject *
 _decimal_Context__apply(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "_apply",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *x;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("_apply", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("_apply", nargs, 1, 1)) {
         goto exit;
     }
     x = args[0];
@@ -6105,25 +5520,12 @@ static PyObject *
 _decimal_Context_apply(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "apply",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *x;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("apply", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("apply", nargs, 1, 1)) {
         goto exit;
     }
     x = args[0];
@@ -6152,25 +5554,12 @@ static PyObject *
 _decimal_Context_canonical(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "canonical",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *x;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("canonical", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("canonical", nargs, 1, 1)) {
         goto exit;
     }
     x = args[0];
@@ -6197,25 +5586,12 @@ static PyObject *
 _decimal_Context_copy_abs(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "copy_abs",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *x;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("copy_abs", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("copy_abs", nargs, 1, 1)) {
         goto exit;
     }
     x = args[0];
@@ -6242,25 +5618,12 @@ static PyObject *
 _decimal_Context_copy_decimal(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "copy_decimal",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *x;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("copy_decimal", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("copy_decimal", nargs, 1, 1)) {
         goto exit;
     }
     x = args[0];
@@ -6287,25 +5650,12 @@ static PyObject *
 _decimal_Context_copy_negate(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "copy_negate",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *x;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("copy_negate", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("copy_negate", nargs, 1, 1)) {
         goto exit;
     }
     x = args[0];
@@ -6331,25 +5681,12 @@ static PyObject *
 _decimal_Context_logb(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "logb",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *x;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("logb", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("logb", nargs, 1, 1)) {
         goto exit;
     }
     x = args[0];
@@ -6389,25 +5726,12 @@ static PyObject *
 _decimal_Context_logical_invert(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "logical_invert",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *x;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("logical_invert", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("logical_invert", nargs, 1, 1)) {
         goto exit;
     }
     x = args[0];
@@ -6434,25 +5758,12 @@ static PyObject *
 _decimal_Context_number_class(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "number_class",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *x;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("number_class", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("number_class", nargs, 1, 1)) {
         goto exit;
     }
     x = args[0];
@@ -6479,25 +5790,12 @@ static PyObject *
 _decimal_Context_to_sci_string(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "to_sci_string",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *x;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("to_sci_string", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("to_sci_string", nargs, 1, 1)) {
         goto exit;
     }
     x = args[0];
@@ -6524,25 +5822,12 @@ static PyObject *
 _decimal_Context_to_eng_string(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "to_eng_string",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *x;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("to_eng_string", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("to_eng_string", nargs, 1, 1)) {
         goto exit;
     }
     x = args[0];
@@ -6569,26 +5854,13 @@ static PyObject *
 _decimal_Context_compare_total(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "compare_total",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
     PyObject *x;
     PyObject *y;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 2, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("compare_total", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("compare_total", nargs, 2, 2)) {
         goto exit;
     }
     x = args[0];
@@ -6616,26 +5888,13 @@ static PyObject *
 _decimal_Context_compare_total_mag(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "compare_total_mag",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
     PyObject *x;
     PyObject *y;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 2, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("compare_total_mag", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("compare_total_mag", nargs, 2, 2)) {
         goto exit;
     }
     x = args[0];
@@ -6663,26 +5922,13 @@ static PyObject *
 _decimal_Context_copy_sign(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "copy_sign",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
     PyObject *x;
     PyObject *y;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 2, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("copy_sign", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("copy_sign", nargs, 2, 2)) {
         goto exit;
     }
     x = args[0];
@@ -6731,26 +5977,13 @@ static PyObject *
 _decimal_Context_logical_and(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "logical_and",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
     PyObject *x;
     PyObject *y;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 2, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("logical_and", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("logical_and", nargs, 2, 2)) {
         goto exit;
     }
     x = args[0];
@@ -6799,26 +6032,13 @@ static PyObject *
 _decimal_Context_logical_or(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "logical_or",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
     PyObject *x;
     PyObject *y;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 2, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("logical_or", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("logical_or", nargs, 2, 2)) {
         goto exit;
     }
     x = args[0];
@@ -6867,26 +6087,13 @@ static PyObject *
 _decimal_Context_logical_xor(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "logical_xor",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
     PyObject *x;
     PyObject *y;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 2, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("logical_xor", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("logical_xor", nargs, 2, 2)) {
         goto exit;
     }
     x = args[0];
@@ -6914,26 +6121,13 @@ static PyObject *
 _decimal_Context_rotate(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "rotate",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
     PyObject *x;
     PyObject *y;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 2, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("rotate", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("rotate", nargs, 2, 2)) {
         goto exit;
     }
     x = args[0];
@@ -6961,26 +6155,13 @@ static PyObject *
 _decimal_Context_scaleb(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "scaleb",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
     PyObject *x;
     PyObject *y;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 2, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("scaleb", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("scaleb", nargs, 2, 2)) {
         goto exit;
     }
     x = args[0];
@@ -7008,26 +6189,13 @@ static PyObject *
 _decimal_Context_shift(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "shift",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
     PyObject *x;
     PyObject *y;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 2, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("shift", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("shift", nargs, 2, 2)) {
         goto exit;
     }
     x = args[0];
@@ -7055,26 +6223,13 @@ static PyObject *
 _decimal_Context_same_quantum(PyObject *context, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "same_quantum",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
     PyObject *x;
     PyObject *y;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 2, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("same_quantum", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("same_quantum", nargs, 2, 2)) {
         goto exit;
     }
     x = args[0];
@@ -7100,4 +6255,4 @@ _decimal_Context_same_quantum(PyObject *context, PyTypeObject *cls, PyObject *co
 #ifndef _DECIMAL_CONTEXT_APPLY_METHODDEF
     #define _DECIMAL_CONTEXT_APPLY_METHODDEF
 #endif /* !defined(_DECIMAL_CONTEXT_APPLY_METHODDEF) */
-/*[clinic end generated code: output=718b1f6c20412350 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=a9830b7caff2ed2a input=a9049054013a1b77]*/
diff --git a/Modules/_io/clinic/bufferedio.c.h b/Modules/_io/clinic/bufferedio.c.h
index b7c0ca2c4b919b6..a11b6f708142598 100644
--- a/Modules/_io/clinic/bufferedio.c.h
+++ b/Modules/_io/clinic/bufferedio.c.h
@@ -4,7 +4,7 @@ preserve
 
 #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
 #  include "pycore_gc.h"          // PyGC_Head
-#  include "pycore_runtime.h"     // _Py_SINGLETON()
+#  include "pycore_runtime.h"     // _Py_ID()
 #endif
 #include "pycore_abstract.h"      // _PyNumber_Index()
 #include "pycore_critical_section.h"// Py_BEGIN_CRITICAL_SECTION()
@@ -135,35 +135,22 @@ static PyObject *
 _io__BufferedIOBase_read(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "read",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     int size = -1;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 0, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("read", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("read", nargs, 0, 1)) {
         goto exit;
     }
     if (nargs < 1) {
-        goto skip_optional_posonly;
+        goto skip_optional;
     }
     size = PyLong_AsInt(args[0]);
     if (size == -1 && PyErr_Occurred()) {
         goto exit;
     }
-skip_optional_posonly:
+skip_optional:
     return_value = _io__BufferedIOBase_read_impl(self, cls, size);
 
 exit:
@@ -190,35 +177,22 @@ static PyObject *
 _io__BufferedIOBase_read1(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "read1",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     int size = -1;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 0, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("read1", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("read1", nargs, 0, 1)) {
         goto exit;
     }
     if (nargs < 1) {
-        goto skip_optional_posonly;
+        goto skip_optional;
     }
     size = PyLong_AsInt(args[0]);
     if (size == -1 && PyErr_Occurred()) {
         goto exit;
     }
-skip_optional_posonly:
+skip_optional:
     return_value = _io__BufferedIOBase_read1_impl(self, cls, size);
 
 exit:
@@ -248,25 +222,12 @@ static PyObject *
 _io__BufferedIOBase_write(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "write",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *b;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("write", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("write", nargs, 1, 1)) {
         goto exit;
     }
     b = args[0];
@@ -904,32 +865,19 @@ static PyObject *
 _io__Buffered_truncate(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "truncate",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *pos = Py_None;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 0, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("truncate", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("truncate", nargs, 0, 1)) {
         goto exit;
     }
     if (nargs < 1) {
-        goto skip_optional_posonly;
+        goto skip_optional;
     }
     pos = args[0];
-skip_optional_posonly:
+skip_optional:
     Py_BEGIN_CRITICAL_SECTION(self);
     return_value = _io__Buffered_truncate_impl((buffered *)self, cls, pos);
     Py_END_CRITICAL_SECTION();
@@ -1265,4 +1213,4 @@ _io_BufferedRandom___init__(PyObject *self, PyObject *args, PyObject *kwargs)
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=3ee17211d2010462 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=5cbd58f93730a19e input=a9049054013a1b77]*/
diff --git a/Modules/_io/clinic/fileio.c.h b/Modules/_io/clinic/fileio.c.h
index 890b6bc3fac9d55..6ca3c85548b9555 100644
--- a/Modules/_io/clinic/fileio.c.h
+++ b/Modules/_io/clinic/fileio.c.h
@@ -231,25 +231,12 @@ static PyObject *
 _io_FileIO_readinto(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "readinto",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     Py_buffer buffer = {NULL, NULL};
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("readinto", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("readinto", nargs, 1, 1)) {
         goto exit;
     }
     if (PyObject_GetBuffer(args[0], &buffer, PyBUF_WRITABLE) < 0) {
@@ -322,34 +309,21 @@ static PyObject *
 _io_FileIO_read(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "read",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     Py_ssize_t size = -1;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 0, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("read", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("read", nargs, 0, 1)) {
         goto exit;
     }
     if (nargs < 1) {
-        goto skip_optional_posonly;
+        goto skip_optional;
     }
     if (!_Py_convert_optional_to_ssize_t(args[0], &size)) {
         goto exit;
     }
-skip_optional_posonly:
+skip_optional:
     return_value = _io_FileIO_read_impl((fileio *)self, cls, size);
 
 exit:
@@ -376,25 +350,12 @@ static PyObject *
 _io_FileIO_write(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "write",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     Py_buffer b = {NULL, NULL};
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("write", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("write", nargs, 1, 1)) {
         goto exit;
     }
     if (PyObject_GetBuffer(args[0], &b, PyBUF_SIMPLE) != 0) {
@@ -498,32 +459,19 @@ static PyObject *
 _io_FileIO_truncate(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "truncate",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *posobj = Py_None;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 0, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("truncate", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("truncate", nargs, 0, 1)) {
         goto exit;
     }
     if (nargs < 1) {
-        goto skip_optional_posonly;
+        goto skip_optional;
     }
     posobj = args[0];
-skip_optional_posonly:
+skip_optional:
     return_value = _io_FileIO_truncate_impl((fileio *)self, cls, posobj);
 
 exit:
@@ -553,4 +501,4 @@ _io_FileIO_isatty(PyObject *self, PyObject *Py_UNUSED(ignored))
 #ifndef _IO_FILEIO_TRUNCATE_METHODDEF
     #define _IO_FILEIO_TRUNCATE_METHODDEF
 #endif /* !defined(_IO_FILEIO_TRUNCATE_METHODDEF) */
-/*[clinic end generated code: output=453d584e2e72f986 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=be3331e5145c5749 input=a9049054013a1b77]*/
diff --git a/Modules/_io/clinic/iobase.c.h b/Modules/_io/clinic/iobase.c.h
index e4438c26431aa8e..199a5debad232d7 100644
--- a/Modules/_io/clinic/iobase.c.h
+++ b/Modules/_io/clinic/iobase.c.h
@@ -2,11 +2,8 @@
 preserve
 [clinic start generated code]*/
 
-#if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-#  include "pycore_runtime.h"     // _Py_SINGLETON()
-#endif
 #include "pycore_abstract.h"      // _Py_convert_optional_to_ssize_t()
-#include "pycore_modsupport.h"    // _PyArg_UnpackKeywords()
+#include "pycore_modsupport.h"    // _PyArg_CheckPositional()
 
 PyDoc_STRVAR(_io__IOBase_seek__doc__,
 "seek($self, offset, whence=os.SEEK_SET, /)\n"
@@ -41,26 +38,13 @@ static PyObject *
 _io__IOBase_seek(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "seek",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
     int offset;
     int whence = 0;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("seek", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("seek", nargs, 1, 2)) {
         goto exit;
     }
     offset = PyLong_AsInt(args[0]);
@@ -68,13 +52,13 @@ _io__IOBase_seek(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ss
         goto exit;
     }
     if (nargs < 2) {
-        goto skip_optional_posonly;
+        goto skip_optional;
     }
     whence = PyLong_AsInt(args[1]);
     if (whence == -1 && PyErr_Occurred()) {
         goto exit;
     }
-skip_optional_posonly:
+skip_optional:
     return_value = _io__IOBase_seek_impl(self, cls, offset, whence);
 
 exit:
@@ -119,32 +103,19 @@ static PyObject *
 _io__IOBase_truncate(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "truncate",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *size = Py_None;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 0, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("truncate", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("truncate", nargs, 0, 1)) {
         goto exit;
     }
     if (nargs < 1) {
-        goto skip_optional_posonly;
+        goto skip_optional;
     }
     size = args[0];
-skip_optional_posonly:
+skip_optional:
     return_value = _io__IOBase_truncate_impl(self, cls, size);
 
 exit:
@@ -445,4 +416,4 @@ _io__RawIOBase_readall(PyObject *self, PyObject *Py_UNUSED(ignored))
 {
     return _io__RawIOBase_readall_impl(self);
 }
-/*[clinic end generated code: output=28c06bb6db32c096 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=cbf2245ae897a158 input=a9049054013a1b77]*/
diff --git a/Modules/_io/clinic/textio.c.h b/Modules/_io/clinic/textio.c.h
index 10d0f1390cccbb4..c2f7d2324058dc0 100644
--- a/Modules/_io/clinic/textio.c.h
+++ b/Modules/_io/clinic/textio.c.h
@@ -4,11 +4,11 @@ preserve
 
 #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
 #  include "pycore_gc.h"          // PyGC_Head
-#  include "pycore_runtime.h"     // _Py_SINGLETON()
+#  include "pycore_runtime.h"     // _Py_ID()
 #endif
 #include "pycore_abstract.h"      // _Py_convert_optional_to_ssize_t()
 #include "pycore_critical_section.h"// Py_BEGIN_CRITICAL_SECTION()
-#include "pycore_modsupport.h"    // _PyArg_UnpackKeywords()
+#include "pycore_modsupport.h"    // _PyArg_CheckPositional()
 
 PyDoc_STRVAR(_io__TextIOBase_detach__doc__,
 "detach($self, /)\n"
@@ -55,35 +55,22 @@ static PyObject *
 _io__TextIOBase_read(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "read",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     int size = -1;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 0, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("read", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("read", nargs, 0, 1)) {
         goto exit;
     }
     if (nargs < 1) {
-        goto skip_optional_posonly;
+        goto skip_optional;
     }
     size = PyLong_AsInt(args[0]);
     if (size == -1 && PyErr_Occurred()) {
         goto exit;
     }
-skip_optional_posonly:
+skip_optional:
     return_value = _io__TextIOBase_read_impl(self, cls, size);
 
 exit:
@@ -110,35 +97,22 @@ static PyObject *
 _io__TextIOBase_readline(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "readline",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     int size = -1;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 0, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("readline", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("readline", nargs, 0, 1)) {
         goto exit;
     }
     if (nargs < 1) {
-        goto skip_optional_posonly;
+        goto skip_optional;
     }
     size = PyLong_AsInt(args[0]);
     if (size == -1 && PyErr_Occurred()) {
         goto exit;
     }
-skip_optional_posonly:
+skip_optional:
     return_value = _io__TextIOBase_readline_impl(self, cls, size);
 
 exit:
@@ -165,25 +139,12 @@ static PyObject *
 _io__TextIOBase_write(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "write",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     const char *s;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("write", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("write", nargs, 1, 1)) {
         goto exit;
     }
     if (!PyUnicode_Check(args[0])) {
@@ -1362,4 +1323,4 @@ _io_TextIOWrapper_buffer_get(PyObject *self, void *Py_UNUSED(context))
 
     return return_value;
 }
-/*[clinic end generated code: output=e93032a0691ff0e4 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=1478299476c616bd input=a9049054013a1b77]*/
diff --git a/Modules/_io/clinic/winconsoleio.c.h b/Modules/_io/clinic/winconsoleio.c.h
index bd8073cd0af3f64..b8968e241cb8899 100644
--- a/Modules/_io/clinic/winconsoleio.c.h
+++ b/Modules/_io/clinic/winconsoleio.c.h
@@ -226,25 +226,12 @@ static PyObject *
 _io__WindowsConsoleIO_readinto(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "readinto",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     Py_buffer buffer = {NULL, NULL};
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("readinto", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("readinto", nargs, 1, 1)) {
         goto exit;
     }
     if (PyObject_GetBuffer(args[0], &buffer, PyBUF_WRITABLE) < 0) {
@@ -311,34 +298,21 @@ static PyObject *
 _io__WindowsConsoleIO_read(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "read",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     Py_ssize_t size = -1;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 0, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("read", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("read", nargs, 0, 1)) {
         goto exit;
     }
     if (nargs < 1) {
-        goto skip_optional_posonly;
+        goto skip_optional;
     }
     if (!_Py_convert_optional_to_ssize_t(args[0], &size)) {
         goto exit;
     }
-skip_optional_posonly:
+skip_optional:
     return_value = _io__WindowsConsoleIO_read_impl((winconsoleio *)self, cls, size);
 
 exit:
@@ -369,25 +343,12 @@ static PyObject *
 _io__WindowsConsoleIO_write(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "write",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     Py_buffer b = {NULL, NULL};
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("write", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("write", nargs, 1, 1)) {
         goto exit;
     }
     if (PyObject_GetBuffer(args[0], &b, PyBUF_SIMPLE) != 0) {
@@ -463,4 +424,4 @@ _io__WindowsConsoleIO_isatty(PyObject *self, PyObject *Py_UNUSED(ignored))
 #ifndef _IO__WINDOWSCONSOLEIO_ISATTY_METHODDEF
     #define _IO__WINDOWSCONSOLEIO_ISATTY_METHODDEF
 #endif /* !defined(_IO__WINDOWSCONSOLEIO_ISATTY_METHODDEF) */
-/*[clinic end generated code: output=dfe49dd71f4f4b1d input=a9049054013a1b77]*/
+/*[clinic end generated code: output=810acdd2135139d5 input=a9049054013a1b77]*/
diff --git a/Modules/_sqlite/clinic/connection.c.h b/Modules/_sqlite/clinic/connection.c.h
index 2feea0ec97bbcae..e80c48be0d6fe6e 100644
--- a/Modules/_sqlite/clinic/connection.c.h
+++ b/Modules/_sqlite/clinic/connection.c.h
@@ -516,27 +516,14 @@ static PyObject *
 create_window_function(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "create_window_function",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[3];
     const char *name;
     int num_params;
     PyObject *aggregate_class;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 3, /*maxpos*/ 3, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("create_window_function", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("create_window_function", nargs, 3, 3)) {
         goto exit;
     }
     if (!PyUnicode_Check(args[0])) {
@@ -584,27 +571,14 @@ static PyObject *
 pysqlite_connection_create_aggregate(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "create_aggregate",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[3];
     const char *name;
     int n_arg;
     PyObject *aggregate_class;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 3, /*maxpos*/ 3, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("create_aggregate", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("create_aggregate", nargs, 3, 3)) {
         goto exit;
     }
     if (!PyUnicode_Check(args[0])) {
@@ -649,25 +623,12 @@ static PyObject *
 pysqlite_connection_set_authorizer(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "set_authorizer",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *callable;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("set_authorizer", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("set_authorizer", nargs, 1, 1)) {
         goto exit;
     }
     callable = args[0];
@@ -771,25 +732,12 @@ static PyObject *
 pysqlite_connection_set_trace_callback(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "set_trace_callback",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *callable;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("set_trace_callback", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("set_trace_callback", nargs, 1, 1)) {
         goto exit;
     }
     callable = args[0];
@@ -1251,26 +1199,13 @@ static PyObject *
 pysqlite_connection_create_collation(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "create_collation",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
     const char *name;
     PyObject *callable;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 2, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("create_collation", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("create_collation", nargs, 2, 2)) {
         goto exit;
     }
     if (!PyUnicode_Check(args[0])) {
@@ -1725,4 +1660,4 @@ getconfig(PyObject *self, PyObject *arg)
 #ifndef DESERIALIZE_METHODDEF
     #define DESERIALIZE_METHODDEF
 #endif /* !defined(DESERIALIZE_METHODDEF) */
-/*[clinic end generated code: output=11ccc746e9223121 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=c3e7157ea43130f8 input=a9049054013a1b77]*/
diff --git a/Modules/cjkcodecs/clinic/multibytecodec.c.h b/Modules/cjkcodecs/clinic/multibytecodec.c.h
index 32588b0561e1acc..3bdabf901126ea8 100644
--- a/Modules/cjkcodecs/clinic/multibytecodec.c.h
+++ b/Modules/cjkcodecs/clinic/multibytecodec.c.h
@@ -596,25 +596,12 @@ static PyObject *
 _multibytecodec_MultibyteStreamWriter_write(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "write",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *strobj;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("write", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("write", nargs, 1, 1)) {
         goto exit;
     }
     strobj = args[0];
@@ -641,25 +628,12 @@ static PyObject *
 _multibytecodec_MultibyteStreamWriter_writelines(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "writelines",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *lines;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("writelines", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("writelines", nargs, 1, 1)) {
         goto exit;
     }
     lines = args[0];
@@ -698,4 +672,4 @@ PyDoc_STRVAR(_multibytecodec___create_codec__doc__,
 
 #define _MULTIBYTECODEC___CREATE_CODEC_METHODDEF    \
     {"__create_codec", (PyCFunction)_multibytecodec___create_codec, METH_O, _multibytecodec___create_codec__doc__},
-/*[clinic end generated code: output=a84b1544d7d01abb input=a9049054013a1b77]*/
+/*[clinic end generated code: output=b7eb6679d9f627b7 input=a9049054013a1b77]*/
diff --git a/Modules/clinic/_asynciomodule.c.h b/Modules/clinic/_asynciomodule.c.h
index 14cf5eebc5eec7a..83d252534b1f509 100644
--- a/Modules/clinic/_asynciomodule.c.h
+++ b/Modules/clinic/_asynciomodule.c.h
@@ -165,25 +165,12 @@ static PyObject *
 _asyncio_Future_set_result(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "set_result",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *result;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("set_result", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("set_result", nargs, 1, 1)) {
         goto exit;
     }
     result = args[0];
@@ -215,25 +202,12 @@ static PyObject *
 _asyncio_Future_set_exception(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "set_exception",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *exception;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("set_exception", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("set_exception", nargs, 1, 1)) {
         goto exit;
     }
     exception = args[0];
@@ -336,25 +310,12 @@ static PyObject *
 _asyncio_Future_remove_done_callback(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "remove_done_callback",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *fn;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("remove_done_callback", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("remove_done_callback", nargs, 1, 1)) {
         goto exit;
     }
     fn = args[0];
@@ -2258,4 +2219,4 @@ _asyncio_future_discard_from_awaited_by(PyObject *module, PyObject *const *args,
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=46d50c477614b57e input=a9049054013a1b77]*/
+/*[clinic end generated code: output=342c0e614e77de9a input=a9049054013a1b77]*/
diff --git a/Modules/clinic/_dbmmodule.c.h b/Modules/clinic/_dbmmodule.c.h
index 6c979a4b0081df3..57359a912032b58 100644
--- a/Modules/clinic/_dbmmodule.c.h
+++ b/Modules/clinic/_dbmmodule.c.h
@@ -2,11 +2,8 @@
 preserve
 [clinic start generated code]*/
 
-#if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-#  include "pycore_runtime.h"     // _Py_SINGLETON()
-#endif
 #include "pycore_critical_section.h"// Py_BEGIN_CRITICAL_SECTION()
-#include "pycore_modsupport.h"    // _PyArg_UnpackKeywords()
+#include "pycore_modsupport.h"    // _PyArg_CheckPositional()
 
 PyDoc_STRVAR(_dbm_dbm_close__doc__,
 "close($self, /)\n"
@@ -78,24 +75,14 @@ static PyObject *
 _dbm_dbm_get(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .format = "s#|O:get",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
     const char *key;
     Py_ssize_t key_length;
     PyObject *default_value = Py_None;
 
-    if (!_PyArg_ParseStackAndKeywords(args, nargs, kwnames, &_parser,
+    if (!_PyArg_NoKwnames("get", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_ParseStack(args, nargs, "s#|O:get",
         &key, &key_length, &default_value)) {
         goto exit;
     }
@@ -127,24 +114,14 @@ static PyObject *
 _dbm_dbm_setdefault(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .format = "s#|O:setdefault",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
     const char *key;
     Py_ssize_t key_length;
     PyObject *default_value = NULL;
 
-    if (!_PyArg_ParseStackAndKeywords(args, nargs, kwnames, &_parser,
+    if (!_PyArg_NoKwnames("setdefault", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_ParseStack(args, nargs, "s#|O:setdefault",
         &key, &key_length, &default_value)) {
         goto exit;
     }
@@ -247,4 +224,4 @@ dbmopen(PyObject *module, PyObject *const *args, Py_ssize_t nargs)
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=677deecf525167a5 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=d3e844f437419eed input=a9049054013a1b77]*/
diff --git a/Modules/clinic/_elementtree.c.h b/Modules/clinic/_elementtree.c.h
index a39e738ec538b63..8ed8cf6326e12ce 100644
--- a/Modules/clinic/_elementtree.c.h
+++ b/Modules/clinic/_elementtree.c.h
@@ -4,10 +4,10 @@ preserve
 
 #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
 #  include "pycore_gc.h"          // PyGC_Head
-#  include "pycore_runtime.h"     // _Py_SINGLETON()
+#  include "pycore_runtime.h"     // _Py_ID()
 #endif
 #include "pycore_abstract.h"      // _PyNumber_Index()
-#include "pycore_modsupport.h"    // _PyArg_UnpackKeywords()
+#include "pycore_modsupport.h"    // _PyArg_CheckPositional()
 
 PyDoc_STRVAR(_elementtree_Element_append__doc__,
 "append($self, subelement, /)\n"
@@ -30,25 +30,12 @@ static PyObject *
 _elementtree_Element_append(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "append",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *subelement;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("append", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("append", nargs, 1, 1)) {
         goto exit;
     }
     if (!PyObject_TypeCheck(args[0], clinic_state()->Element_Type)) {
@@ -192,25 +179,12 @@ static PyObject *
 _elementtree_Element___setstate__(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "__setstate__",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *state;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("__setstate__", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("__setstate__", nargs, 1, 1)) {
         goto exit;
     }
     state = args[0];
@@ -239,25 +213,12 @@ static PyObject *
 _elementtree_Element_extend(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "extend",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *elements;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("extend", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("extend", nargs, 1, 1)) {
         goto exit;
     }
     elements = args[0];
@@ -848,26 +809,13 @@ static PyObject *
 _elementtree_Element_makeelement(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "makeelement",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
     PyObject *tag;
     PyObject *attrib;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 2, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("makeelement", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("makeelement", nargs, 2, 2)) {
         goto exit;
     }
     tag = args[0];
@@ -1479,4 +1427,4 @@ _elementtree_XMLParser__setevents(PyObject *self, PyObject *const *args, Py_ssiz
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=e2e9cf288c4400f6 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=1b6dd1add8c0aa0a input=a9049054013a1b77]*/
diff --git a/Modules/clinic/_gdbmmodule.c.h b/Modules/clinic/_gdbmmodule.c.h
index fe993cc328fbd2f..a9a76cc45558fb0 100644
--- a/Modules/clinic/_gdbmmodule.c.h
+++ b/Modules/clinic/_gdbmmodule.c.h
@@ -2,9 +2,6 @@
 preserve
 [clinic start generated code]*/
 
-#if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-#  include "pycore_runtime.h"     // _Py_SINGLETON()
-#endif
 #include "pycore_critical_section.h"// Py_BEGIN_CRITICAL_SECTION()
 #include "pycore_modsupport.h"    // _PyArg_CheckPositional()
 
@@ -190,23 +187,13 @@ static PyObject *
 _gdbm_gdbm_nextkey(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .format = "s#:nextkey",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
     const char *key;
     Py_ssize_t key_length;
 
-    if (!_PyArg_ParseStackAndKeywords(args, nargs, kwnames, &_parser,
+    if (!_PyArg_NoKwnames("nextkey", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_ParseStack(args, nargs, "s#:nextkey",
         &key, &key_length)) {
         goto exit;
     }
@@ -389,4 +376,4 @@ dbmopen(PyObject *module, PyObject *const *args, Py_ssize_t nargs)
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=429b5db24568292e input=a9049054013a1b77]*/
+/*[clinic end generated code: output=0ff09ddcd6898040 input=a9049054013a1b77]*/
diff --git a/Modules/clinic/_pickle.c.h b/Modules/clinic/_pickle.c.h
index 213e817a50a287f..d15c04e295d8cc5 100644
--- a/Modules/clinic/_pickle.c.h
+++ b/Modules/clinic/_pickle.c.h
@@ -4,9 +4,9 @@ preserve
 
 #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
 #  include "pycore_gc.h"          // PyGC_Head
-#  include "pycore_runtime.h"     // _Py_SINGLETON()
+#  include "pycore_runtime.h"     // _Py_ID()
 #endif
-#include "pycore_modsupport.h"    // _PyArg_UnpackKeywords()
+#include "pycore_modsupport.h"    // _PyArg_CheckPositional()
 
 PyDoc_STRVAR(_pickle_Pickler_clear_memo__doc__,
 "clear_memo($self, /)\n"
@@ -48,25 +48,12 @@ static PyObject *
 _pickle_Pickler_dump(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "dump",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *obj;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("dump", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("dump", nargs, 1, 1)) {
         goto exit;
     }
     obj = args[0];
@@ -286,25 +273,12 @@ static PyObject *
 _pickle_Unpickler_persistent_load(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "persistent_load",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *pid;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("persistent_load", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("persistent_load", nargs, 1, 1)) {
         goto exit;
     }
     pid = args[0];
@@ -365,26 +339,13 @@ static PyObject *
 _pickle_Unpickler_find_class(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "find_class",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
     PyObject *module_name;
     PyObject *global_name;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 2, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("find_class", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("find_class", nargs, 2, 2)) {
         goto exit;
     }
     module_name = args[0];
@@ -1098,4 +1059,4 @@ _pickle_loads(PyObject *module, PyObject *const *args, Py_ssize_t nargs, PyObjec
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=6331c72b3c427f63 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=df25a5fe475b57b0 input=a9049054013a1b77]*/
diff --git a/Modules/clinic/_testclinic.c.h b/Modules/clinic/_testclinic.c.h
index c3bf217a9e7b7b7..cc1bb819afce655 100644
--- a/Modules/clinic/_testclinic.c.h
+++ b/Modules/clinic/_testclinic.c.h
@@ -4508,26 +4508,9 @@ static PyObject *
 _testclinic_TestClass_defclass_varpos(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = { NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "defclass_varpos",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
-    PyObject * const *fastargs;
     PyObject *__clinic_args = NULL;
 
-    fastargs = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 0, /*maxpos*/ 0, /*minkw*/ 0, /*varpos*/ 1, argsbuf);
-    if (!fastargs) {
+    if (!_PyArg_NoKwnames("defclass_varpos", kwnames)) {
         goto exit;
     }
     __clinic_args = PyTuple_FromArray(args, nargs);
@@ -4561,32 +4544,18 @@ static PyObject *
 _testclinic_TestClass_defclass_posonly_varpos(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "defclass_posonly_varpos",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
-    PyObject * const *fastargs;
     PyObject *a;
     PyObject *b;
     PyObject *__clinic_args = NULL;
 
-    fastargs = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 2, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 1, argsbuf);
-    if (!fastargs) {
+    if (!_PyArg_NoKwnames("defclass_posonly_varpos", kwnames)) {
         goto exit;
     }
-    a = fastargs[0];
-    b = fastargs[1];
+    if (!_PyArg_CheckPositional("defclass_posonly_varpos", nargs, 2, PY_SSIZE_T_MAX)) {
+        goto exit;
+    }
+    a = args[0];
+    b = args[1];
     __clinic_args = PyTuple_FromArray(args + 2, nargs - 2);
     if (__clinic_args == NULL) {
         goto exit;
@@ -5349,4 +5318,4 @@ vc_kwonly_vectorcall(PyObject *type, PyObject *const *args,
         kwnames ? PyTuple_GET_SIZE(kwnames) : 0,
         NULL, kwnames);
 }
-/*[clinic end generated code: output=8a219f606f1296ac input=a9049054013a1b77]*/
+/*[clinic end generated code: output=5131e55aeb855d6e input=a9049054013a1b77]*/
diff --git a/Modules/clinic/_zoneinfo.c.h b/Modules/clinic/_zoneinfo.c.h
index 19564a6c13f246a..f37d86d62a3b13a 100644
--- a/Modules/clinic/_zoneinfo.c.h
+++ b/Modules/clinic/_zoneinfo.c.h
@@ -276,25 +276,12 @@ static PyObject *
 zoneinfo_ZoneInfo_utcoffset(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "utcoffset",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *dt;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("utcoffset", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("utcoffset", nargs, 1, 1)) {
         goto exit;
     }
     dt = args[0];
@@ -320,25 +307,12 @@ static PyObject *
 zoneinfo_ZoneInfo_dst(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "dst",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *dt;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("dst", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("dst", nargs, 1, 1)) {
         goto exit;
     }
     dt = args[0];
@@ -365,25 +339,12 @@ static PyObject *
 zoneinfo_ZoneInfo_tzname(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "tzname",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *dt;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("tzname", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("tzname", nargs, 1, 1)) {
         goto exit;
     }
     dt = args[0];
@@ -410,26 +371,13 @@ static PyObject *
 zoneinfo_ZoneInfo__unpickle(PyObject *type, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "_unpickle",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
     PyObject *key;
     unsigned char from_cache;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 2, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("_unpickle", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("_unpickle", nargs, 2, 2)) {
         goto exit;
     }
     key = args[0];
@@ -454,4 +402,4 @@ zoneinfo_ZoneInfo__unpickle(PyObject *type, PyTypeObject *cls, PyObject *const *
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=c6df04d7b400bd7f input=a9049054013a1b77]*/
+/*[clinic end generated code: output=e40dc30eeec42b74 input=a9049054013a1b77]*/
diff --git a/Modules/clinic/arraymodule.c.h b/Modules/clinic/arraymodule.c.h
index 1e9f317853d6c2e..e4543c108df2b35 100644
--- a/Modules/clinic/arraymodule.c.h
+++ b/Modules/clinic/arraymodule.c.h
@@ -2,9 +2,6 @@
 preserve
 [clinic start generated code]*/
 
-#if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-#  include "pycore_runtime.h"     // _Py_SINGLETON()
-#endif
 #include "pycore_abstract.h"      // _PyNumber_Index()
 #include "pycore_modsupport.h"    // _PyArg_CheckPositional()
 
@@ -217,25 +214,12 @@ static PyObject *
 array_array_extend(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "extend",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *bb;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("extend", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("extend", nargs, 1, 1)) {
         goto exit;
     }
     bb = args[0];
@@ -386,26 +370,13 @@ static PyObject *
 array_array_fromfile(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "fromfile",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
     PyObject *f;
     Py_ssize_t n;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 2, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("fromfile", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("fromfile", nargs, 2, 2)) {
         goto exit;
     }
     f = args[0];
@@ -448,25 +419,12 @@ static PyObject *
 array_array_tofile(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "tofile",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *f;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("tofile", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("tofile", nargs, 1, 1)) {
         goto exit;
     }
     f = args[0];
@@ -710,25 +668,12 @@ static PyObject *
 array_array___reduce_ex__(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "__reduce_ex__",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *value;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("__reduce_ex__", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("__reduce_ex__", nargs, 1, 1)) {
         goto exit;
     }
     value = args[0];
@@ -781,4 +726,4 @@ array_arrayiterator___setstate__(PyObject *self, PyObject *state)
 
     return return_value;
 }
-/*[clinic end generated code: output=32784678e77ac658 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=54ec10a63676f320 input=a9049054013a1b77]*/
diff --git a/Modules/clinic/pyexpat.c.h b/Modules/clinic/pyexpat.c.h
index 959e06da7791145..95f56c88e1aa92a 100644
--- a/Modules/clinic/pyexpat.c.h
+++ b/Modules/clinic/pyexpat.c.h
@@ -4,10 +4,10 @@ preserve
 
 #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
 #  include "pycore_gc.h"          // PyGC_Head
-#  include "pycore_runtime.h"     // _Py_SINGLETON()
+#  include "pycore_runtime.h"     // _Py_ID()
 #endif
 #include "pycore_long.h"          // _PyLong_UnsignedLongLong_Converter()
-#include "pycore_modsupport.h"    // _PyArg_UnpackKeywords()
+#include "pycore_modsupport.h"    // _PyArg_CheckPositional()
 
 PyDoc_STRVAR(pyexpat_xmlparser_SetReparseDeferralEnabled__doc__,
 "SetReparseDeferralEnabled($self, enabled, /)\n"
@@ -77,37 +77,24 @@ static PyObject *
 pyexpat_xmlparser_Parse(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "Parse",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
     PyObject *data;
     int isfinal = 0;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("Parse", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("Parse", nargs, 1, 2)) {
         goto exit;
     }
     data = args[0];
     if (nargs < 2) {
-        goto skip_optional_posonly;
+        goto skip_optional;
     }
     isfinal = PyObject_IsTrue(args[1]);
     if (isfinal < 0) {
         goto exit;
     }
-skip_optional_posonly:
+skip_optional:
     return_value = pyexpat_xmlparser_Parse_impl((xmlparseobject *)self, cls, data, isfinal);
 
 exit:
@@ -133,25 +120,12 @@ static PyObject *
 pyexpat_xmlparser_ParseFile(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "ParseFile",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *file;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("ParseFile", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("ParseFile", nargs, 1, 1)) {
         goto exit;
     }
     file = args[0];
@@ -285,26 +259,13 @@ static PyObject *
 pyexpat_xmlparser_ExternalEntityParserCreate(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", "", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "ExternalEntityParserCreate",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[2];
     const char *context;
     const char *encoding = NULL;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 2, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("ExternalEntityParserCreate", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("ExternalEntityParserCreate", nargs, 1, 2)) {
         goto exit;
     }
     if (args[0] == Py_None) {
@@ -326,7 +287,7 @@ pyexpat_xmlparser_ExternalEntityParserCreate(PyObject *self, PyTypeObject *cls,
         goto exit;
     }
     if (nargs < 2) {
-        goto skip_optional_posonly;
+        goto skip_optional;
     }
     if (!PyUnicode_Check(args[1])) {
         _PyArg_BadArgument("ExternalEntityParserCreate", "argument 2", "str", args[1]);
@@ -341,7 +302,7 @@ pyexpat_xmlparser_ExternalEntityParserCreate(PyObject *self, PyTypeObject *cls,
         PyErr_SetString(PyExc_ValueError, "embedded null character");
         goto exit;
     }
-skip_optional_posonly:
+skip_optional:
     return_value = pyexpat_xmlparser_ExternalEntityParserCreate_impl((xmlparseobject *)self, cls, context, encoding);
 
 exit:
@@ -405,35 +366,22 @@ static PyObject *
 pyexpat_xmlparser_UseForeignDTD(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "UseForeignDTD",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     int flag = 1;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 0, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("UseForeignDTD", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("UseForeignDTD", nargs, 0, 1)) {
         goto exit;
     }
     if (nargs < 1) {
-        goto skip_optional_posonly;
+        goto skip_optional;
     }
     flag = PyObject_IsTrue(args[0]);
     if (flag < 0) {
         goto exit;
     }
-skip_optional_posonly:
+skip_optional:
     return_value = pyexpat_xmlparser_UseForeignDTD_impl((xmlparseobject *)self, cls, flag);
 
 exit:
@@ -472,25 +420,12 @@ static PyObject *
 pyexpat_xmlparser_SetBillionLaughsAttackProtectionActivationThreshold(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "SetBillionLaughsAttackProtectionActivationThreshold",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     unsigned long long threshold;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("SetBillionLaughsAttackProtectionActivationThreshold", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("SetBillionLaughsAttackProtectionActivationThreshold", nargs, 1, 1)) {
         goto exit;
     }
     if (!_PyLong_UnsignedLongLong_Converter(args[0], &threshold)) {
@@ -541,25 +476,12 @@ static PyObject *
 pyexpat_xmlparser_SetBillionLaughsAttackProtectionMaximumAmplification(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "SetBillionLaughsAttackProtectionMaximumAmplification",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     float max_factor;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("SetBillionLaughsAttackProtectionMaximumAmplification", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("SetBillionLaughsAttackProtectionMaximumAmplification", nargs, 1, 1)) {
         goto exit;
     }
     if (PyFloat_CheckExact(args[0])) {
@@ -604,25 +526,12 @@ static PyObject *
 pyexpat_xmlparser_SetAllocTrackerActivationThreshold(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "SetAllocTrackerActivationThreshold",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     unsigned long long threshold;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("SetAllocTrackerActivationThreshold", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("SetAllocTrackerActivationThreshold", nargs, 1, 1)) {
         goto exit;
     }
     if (!_PyLong_UnsignedLongLong_Converter(args[0], &threshold)) {
@@ -671,25 +580,12 @@ static PyObject *
 pyexpat_xmlparser_SetAllocTrackerMaximumAmplification(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "SetAllocTrackerMaximumAmplification",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     float max_factor;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("SetAllocTrackerMaximumAmplification", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("SetAllocTrackerMaximumAmplification", nargs, 1, 1)) {
         goto exit;
     }
     if (PyFloat_CheckExact(args[0])) {
@@ -870,4 +766,4 @@ pyexpat_ErrorString(PyObject *module, PyObject *arg)
 #ifndef PYEXPAT_XMLPARSER_SETALLOCTRACKERMAXIMUMAMPLIFICATION_METHODDEF
     #define PYEXPAT_XMLPARSER_SETALLOCTRACKERMAXIMUMAMPLIFICATION_METHODDEF
 #endif /* !defined(PYEXPAT_XMLPARSER_SETALLOCTRACKERMAXIMUMAMPLIFICATION_METHODDEF) */
-/*[clinic end generated code: output=c68606a1fbc3a501 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=6a2d0b0e35fd07fa input=a9049054013a1b77]*/
diff --git a/Modules/clinic/zlibmodule.c.h b/Modules/clinic/zlibmodule.c.h
index 620e483d5a759a7..023b178dc58fb5b 100644
--- a/Modules/clinic/zlibmodule.c.h
+++ b/Modules/clinic/zlibmodule.c.h
@@ -455,25 +455,12 @@ static PyObject *
 zlib_Compress_compress(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "compress",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     Py_buffer data = {NULL, NULL};
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("compress", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("compress", nargs, 1, 1)) {
         goto exit;
     }
     if (PyObject_GetBuffer(args[0], &data, PyBUF_SIMPLE) != 0) {
@@ -612,35 +599,22 @@ static PyObject *
 zlib_Compress_flush(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "flush",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     int mode = Z_FINISH;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 0, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("flush", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("flush", nargs, 0, 1)) {
         goto exit;
     }
     if (nargs < 1) {
-        goto skip_optional_posonly;
+        goto skip_optional;
     }
     mode = PyLong_AsInt(args[0]);
     if (mode == -1 && PyErr_Occurred()) {
         goto exit;
     }
-skip_optional_posonly:
+skip_optional:
     return_value = zlib_Compress_flush_impl((compobject *)self, cls, mode);
 
 exit:
@@ -716,25 +690,12 @@ static PyObject *
 zlib_Compress___deepcopy__(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "__deepcopy__",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *memo;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("__deepcopy__", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("__deepcopy__", nargs, 1, 1)) {
         goto exit;
     }
     memo = args[0];
@@ -815,25 +776,12 @@ static PyObject *
 zlib_Decompress___deepcopy__(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "__deepcopy__",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     PyObject *memo;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 1, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("__deepcopy__", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("__deepcopy__", nargs, 1, 1)) {
         goto exit;
     }
     memo = args[0];
@@ -865,29 +813,16 @@ static PyObject *
 zlib_Decompress_flush(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
-    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
-    #else
-    #  define KWTUPLE NULL
-    #endif
-
-    static const char * const _keywords[] = {"", NULL};
-    static _PyArg_Parser _parser = {
-        .keywords = _keywords,
-        .fname = "flush",
-        .kwtuple = KWTUPLE,
-    };
-    #undef KWTUPLE
-    PyObject *argsbuf[1];
     Py_ssize_t length = DEF_BUF_SIZE;
 
-    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser,
-            /*minpos*/ 0, /*maxpos*/ 1, /*minkw*/ 0, /*varpos*/ 0, argsbuf);
-    if (!args) {
+    if (!_PyArg_NoKwnames("flush", kwnames)) {
+        goto exit;
+    }
+    if (!_PyArg_CheckPositional("flush", nargs, 0, 1)) {
         goto exit;
     }
     if (nargs < 1) {
-        goto skip_optional_posonly;
+        goto skip_optional;
     }
     {
         Py_ssize_t ival = -1;
@@ -901,7 +836,7 @@ zlib_Decompress_flush(PyObject *self, PyTypeObject *cls, PyObject *const *args,
         }
         length = ival;
     }
-skip_optional_posonly:
+skip_optional:
     return_value = zlib_Decompress_flush_impl((compobject *)self, cls, length);
 
 exit:
@@ -1403,4 +1338,4 @@ zlib_crc32_combine(PyObject *module, PyObject *const *args, Py_ssize_t nargs)
 #ifndef ZLIB_DECOMPRESS___DEEPCOPY___METHODDEF
     #define ZLIB_DECOMPRESS___DEEPCOPY___METHODDEF
 #endif /* !defined(ZLIB_DECOMPRESS___DEEPCOPY___METHODDEF) */
-/*[clinic end generated code: output=c9a60fe6600a2e4d input=a9049054013a1b77]*/
+/*[clinic end generated code: output=f4c3b5abac20df9b input=a9049054013a1b77]*/
diff --git a/Tools/clinic/libclinic/parse_args.py b/Tools/clinic/libclinic/parse_args.py
index 4b6b54bc4febf3a..97e006bad055a31 100644
--- a/Tools/clinic/libclinic/parse_args.py
+++ b/Tools/clinic/libclinic/parse_args.py
@@ -921,6 +921,15 @@ def select_positional_convention(self) -> tuple[str, str]:
         Set the method flags and the prototype, and return the expression of
         the number of arguments and the format of an argument expression.
         """
+        if self.requires_defining_class:
+            # METH_METHOD only supports the METH_FASTCALL|METH_KEYWORDS
+            # calling convention, so the wrapper still receives kwnames.
+            # A positional-only function simply rejects any keywords
+            # instead of setting up a _PyArg_Parser.
+            assert self.fastcall
+            self.flags = "METH_METHOD|METH_FASTCALL|METH_KEYWORDS"
+            self.parser_prototype = PARSER_PROTOTYPE_DEF_CLASS
+            return 'nargs', 'args[%s]'
         if self.fastcall:
             self.flags = "METH_FASTCALL"
             self.parser_prototype = PARSER_PROTOTYPE_FASTCALL
@@ -1005,6 +1014,14 @@ def parse_pos_only(self) -> None:
                     goto exit;
                 }}
                 """, indent=4) % parse_call]
+        if self.requires_defining_class:
+            self.codegen.add_include('pycore_modsupport.h',
+                                     '_PyArg_NoKwnames()')
+            parser_code.insert(0, libclinic.normalize_snippet("""
+                if (!_PyArg_NoKwnames("{name}", kwnames)) {{
+                    goto exit;
+                }}
+                """, indent=4))
         self.parser_body(*parser_code)
 
     def parse_var_keyword(self) -> None:
@@ -1683,8 +1700,9 @@ def parse_args(self, clang: CLanguage) -> dict[str, str]:
             self.parse_option_groups()
         elif self.var_keyword is not None:
             self.parse_var_keyword()
-        elif (not self.requires_defining_class
-              and self.pos_only == len(self.parameters)):
+        elif (self.pos_only == len(self.parameters)
+              and (not self.requires_defining_class
+                   or (self.fastcall and not self.limited_capi))):
             self.parse_pos_only()
         else:
             self.parse_general(clang)