[issue31234] Make support.threading_cleanup() stricter

[STINNER Victor]

STINNER Victor added the comment:


New changeset 167cbde50a88ec2a7d26b2cb9891d5e32bdfbfb5 by Victor Stinner in branch 'master':
bpo-31234: Join threads in test_queue (#3586)
https://github.com/python/cpython/commit/167cbde50a88ec2a7d26b2cb9891d5e32bdfbfb5


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