[issue28253] calendar.prcal(9999) output has a problem

[Xiang Zhang]

Xiang Zhang added the comment:

Patch LGTM. 

> I would rather not mess up with itermonthdates(), particularly in a bugfix release.  We can postpone the discussion of a better way to handle date over/underflow in itermonthdates() until 3.7.

Before finally find a better way, can we at least make the two extreme cases behaviours consistent? Both emitting an exception or a shorter list.

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<http://bugs.python.org/issue28253>
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