[issue35723] Add "time zone index" cache to datetime objects

[Ivan Pozdeev]

Ivan Pozdeev <ivan_pozdeev at mail.ru> added the comment:

> which unfortunately use `is` to determine whether two datetimes are in the same zone or not

This sounds like a bug. Whether a tzinfo is a constant from a predefined set or something with a smart comparison semantic is none of datetime's business.

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nosy: +Ivan.Pozdeev

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35723>
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