[issue23521] OverflowError from timedelta * float in datetime.py

[Alexander Belopolsky]

Alexander Belopolsky added the comment:

We can further optimize _divide_and_round by changing r*=2 to r<<=1 and q % 2 == 1 to (q & 1), but this will obfuscate the algorithm and limit arguments to ints.  (As written, _divide_and_round will work with any numeric types.)

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<http://bugs.python.org/issue23521>
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