[issue46266] Improve day constants (`MONDAY` ... `SUNDAY`) in `calendar.py`

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

> The problem is they are documented here:
> https://docs.python.org/3/library/calendar.html#calendar.setfirstweekday

Well, that does make them public, so we have to go forward.

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resolution: rejected -> 
status: closed -> open

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue46266>
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