[issue42846] Using _multibytecodec module on Windows, test_threading/embed get failure

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

> bpo-42846: Convert CJK codec extensions to multiphase init (GH-24157)

I added a new test and new test spotted a reference leak, likely an existing one: bpo-42866 "test test_multibytecodec: Test_IncrementalEncoder.test_subinterp() leaks references".

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42846>
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