[issue31234] Make support.threading_cleanup() stricter

[STINNER Victor]

STINNER Victor added the comment:


New changeset 8dcf22f442320e4c1a5408e67b4c9002ad105f17 by Victor Stinner in branch 'master':
bpo-31234: Join threads in test_hashlib (#3573)
https://github.com/python/cpython/commit/8dcf22f442320e4c1a5408e67b4c9002ad105f17


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