[issue42671] Make the Python finalization more deterministic

[STINNER Victor]

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

I took some notes on latest changes of the Python finalization order:
https://pythondev.readthedocs.io/finalization.html#reorder-python-finalization

Not directly related, I also took notes on the "weird GC behavior during Python finalization" (such as the issue that I have with my _thread change):
https://pythondev.readthedocs.io/finalization.html#weird-gc-behavior-during-python-finalization

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42671>
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