[issue29962] Add math.remainder operation

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

See also Decimal.remainder_near and _PyLong_DivmodNear. Shouldn't the new function be named math.remainder_near?

In many cases the function that returns the nearest integer quotient is useful. See Fraction.__round__, datetime._divide_and_round, _pydecimal._div_nearest, etc.

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nosy: +serhiy.storchaka

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<http://bugs.python.org/issue29962>
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