gh-151722: Defer GC tracking in frozendict.copy()#152230
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Fix _PyDict_Or() and frozendict.copy(): only track the frozendict by the GC once the dictionary is fully initialized. Functions modifying frozendict now ensures that the object is not tracked by the GC (in debug mode). * can_modify_dict() checks that _PyObject_GC_IS_TRACKED() is false for frozendicts. * dict_merge_api() makes sure that the dictionary is tracked by the GC.
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needs backport to 3.15
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Fix _PyDict_Or() and frozendict.copy(): only track the frozendict by the GC once the dictionary is fully initialized.
Functions modifying frozendict now ensures that the object is not tracked by the GC (in debug mode).