Avoid extra mutable strings in TruffleRuby generator#964

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eregon wants to merge 2 commits intoruby:masterfrom

eregon:avoid-extra-mutable-strings

Commits on Mar 26, 2026

Only make the result of JSON.{dump,generate} mutable, not of every #to_json method
eregon
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Avoid extra String#+@ calls, interpolated strings are already mutable
eregon
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