[issue27298] redundant iteration over digits in _PyLong_AsUnsignedLongMask

[STINNER Victor]

STINNER Victor added the comment:

> To sum it up, my patch degrades performance for ints smaller than (approximately) 10 ** 150, and improves performance for bigger ints. 

IMHO Python language mostly handles integers smaller than 1 million, so the optimization is not a good idea :-) I had the same issue when I tried to modify Python to use GMP internally for long integers.

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nosy: +haypo

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