[issue21136] fractions.Fraction.__pow__ does unneeded renormalization

[Ezio Melotti]

Changes by Ezio Melotti <ezio.melotti at gmail.com>:


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nosy: +ezio.melotti, mark.dickinson, rhettinger
stage:  -> needs patch
versions: +Python 3.5 -Python 2.7, Python 3.2

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21136>
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