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

[STINNER Victor]

Change by STINNER Victor <vstinner at redhat.com>:


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pull_requests: +13665
pull_request: https://github.com/python/cpython/pull/13780

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