gh-144161: Clarify additional immortalization in free-threaded build #144176
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…build Clarify that the objects listed in the free-threading HOWTO are additional immortalizations specific to the free-threaded build. This addresses the inconsistency with sys.intern() documentation, which describes the default (mortal) behavior.
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I think it would make much more sense to just add a note to sys.intern and PyUnicode_InternInPlace saying that the free-threaded build makes all interned strings immortal.
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Clarify that the objects listed in the free-threading HOWTO are additional immortalizations specific to the free-threaded build.
This addresses the inconsistency reported in #144161, where
sys.intern()documentation states that interned strings are not immortal, while the free-threading HOWTO suggested otherwise. Both are correct for their respective contexts (default vs. free-threaded builds).Changes follow the suggestion by @Prometheus3375 in the issue discussion.
📚 Documentation preview 📚: https://cpython-previews--144176.org.readthedocs.build/