[issue12080] decimal.py: performance in _power_exact

[Roundup Robot]

Roundup Robot <devnull at devnull> added the comment:

New changeset c3fe54781244 by Mark Dickinson in branch 'default':
Issue #12080: Fix a performance issue in Decimal._power_exact that causes some corner-case Decimal.__pow__ calls to take an unreasonably long time.
http://hg.python.org/cpython/rev/c3fe54781244

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nosy: +python-dev

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