[issue31234] Make support.threading_cleanup() stricter

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:


New changeset 5dbb48aaac0ff74648b355ebdde222856004b1ef by Victor Stinner in branch '3.6':
[3.6] bpo-31234: Add test.support.wait_threads_exit() (GH-3578) (GH-7315)
https://github.com/python/cpython/commit/5dbb48aaac0ff74648b355ebdde222856004b1ef


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