[issue35276] Document thread safety

[STINNER Victor]

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

Aha, another strange beast: in Python 3, locale.localeconv() now changes temporarily the LC_CTYPE locale is some cases, and this change affects other threads. That's not something expected.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35276>
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