[issue21136] fractions.Fraction.__pow__ does unneeded renormalization

[Mark Dickinson]

Mark Dickinson added the comment:

> Does this work correctly in the case `Fraction(0, 1) ** -2`?

Looks like it doesn't.  How about adding a `_skip_normalization` keyword argument to `Fraction.__new__` instead?  That would ensure that any future changes made to `__new__` don't get skipped by this fast path.

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