[issue31234] Make support.threading_cleanup() stricter

[STINNER Victor]

STINNER Victor added the comment:


New changeset ff40ecda73178dfcad24e26240d684356ef20793 by Victor Stinner in branch 'master':
bpo-31234: Add test.support.wait_threads_exit() (#3578)
https://github.com/python/cpython/commit/ff40ecda73178dfcad24e26240d684356ef20793


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