[issue25928] Improve performance of statistics._decimal_to_ratio and fractions.from_decimal

[John Walker]

John Walker added the comment:

> That should only happen if the C version did not build for some reason:

Ahh, gotcha. I assume one instance where this happens is when the machine doesn't have libmpdec.so

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25928>
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