[issue19787] Fix PyThread_set_key_value() strange behaviour

[Roundup Robot]

Roundup Robot added the comment:

New changeset 5d078b0bae75 by Victor Stinner in branch 'default':
Issue #19787: PyThread_set_key_value() now always set the value
http://hg.python.org/cpython/rev/5d078b0bae75

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19787>
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