[issue31234] Make support.threading_cleanup() stricter

[STINNER Victor]

STINNER Victor added the comment:


New changeset 18e95b4176256f100429a806d0455406df98f984 by Victor Stinner in branch 'master':
bpo-31234: Join threads in tests (#3572)
https://github.com/python/cpython/commit/18e95b4176256f100429a806d0455406df98f984


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