[issue33608] Add a cross-interpreter-safe mechanism to indicate that an object may be destroyed.

[Eric Snow]

Eric Snow <ericsnowcurrently at gmail.com> added the comment:

FWIW, the failures before were in test_io and test_multiprocessing_spawn, not test_asyncio.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33608>
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