[issue42972] [C API] Heap types (PyType_FromSpec) must fully implement the GC protocol

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

I'm not fully satified by the overlapped_dealloc() implementation neither. There is an unpleasant code path for Windows XP but it's no longer needed in Python 3.11. I would prefer to always call PyObject_GC_UnTrack() and call it earlier.

See the dicsussion in the PR:
https://github.com/python/cpython/pull/26381

But it can be modified later.

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