[Datetime-SIG] Another round on error-checking

[Alexander Belopolsky]

On Tue, Sep 1, 2015 at 1:23 AM, Tim Peters <tim.peters at gmail.com> wrote:

> I can see one kind of annoyance that would remain:
>
>     dt2 = dt1 + a_timedelta
>
> is currently specified to force dt2.fold==0 even if dt1.fold==1.  But
> that may not make good sense.
>

Note that dt2.fold==0 even if dt1.fold==1 *and* a_timedelta==timedelta(0).

This is what I call "fold-unaware" arithmetic.  It is consistent with
dt2==dt1.
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