[issue17659] no way to determine First weekday (based on locale)

[Cédric Krier]

Change by Cédric Krier <cedric.krier at b2ck.com>:


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pull_requests: +17529
pull_request: https://github.com/python/cpython/pull/18142

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue17659>
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