[issue31234] Make support.threading_cleanup() stricter

[STINNER Victor]

STINNER Victor added the comment:


New changeset 89bfc9b0d9033f7c9f086c7281a31a489fe1136f by Victor Stinner (Miss Islington (bot)) in branch '3.6':
[3.6] bpo-31234: test_threaded_import: fix test_side_effect_import() (GH-3189) (#3537)
https://github.com/python/cpython/commit/89bfc9b0d9033f7c9f086c7281a31a489fe1136f


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