[issue43484] we can create valid datetime objects that become invalid if the timezone is changed

[Éric Araujo]

Change by Éric Araujo <merwok at netwok.org>:


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nosy: +eric.araujo
versions:  -Python 3.6, Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43484>
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