[issue31234] Make support.threading_cleanup() stricter

[STINNER Victor]

STINNER Victor added the comment:


New changeset ace1ecc00b35a8b1dc6e352d547dde07913017bb by Victor Stinner in branch 'master':
bpo-31234: threading_cleanup() now warns immediately (#3138)
https://github.com/python/cpython/commit/ace1ecc00b35a8b1dc6e352d547dde07913017bb


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<https://bugs.python.org/issue31234>
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