[issue19475] Add timespec optional flag to datetime isoformat() to choose the precision

[STINNER Victor]

STINNER Victor added the comment:

> Given that we're talking about what to do when we're suppressing the usecs I don't think roundtripping matters. :-)

I changed many times how Python rounds nanoseconds in the private PyTime API, and I got a bug report because of that! => issue #23517.

By the way, I wrote an article to explain the history the private PyTime API, especially changes on rounding ;-) https://haypo.github.io/pytime.html

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<http://bugs.python.org/issue19475>
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