[issue28292] Make Calendar.itermonthdates() behave consistently in edge cases

[Raymond Hettinger]

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

For people using "import calendar", the __all__ variable has no effect.  Running help(calendar) shows the functions as if they were public functions.  The module historically hid its private details with the leading underscores.  The patch in question violated that norm.  We have evidence that a real user was confused by this.  Please fix it.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue28292>
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