[issue31095] Checking all tp_dealloc with Py_TPFLAGS_HAVE_GC

[INADA Naoki]

INADA Naoki added the comment:

> should the base method which calls tp_dealloc do this?  Maybe can kill all birds with one stone.

It may be possible, but unclear.
Object finalization process is very complicated.

I agree that UnTrack object as soon as refcnt=0, and Track only when
resurrected seems clearer.
But changing such basic object system needs carefully designed by expert.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue31095>
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