[issue15544] math.isnan fails with some Decimal NaNs

[Roundup Robot]

Roundup Robot added the comment:

New changeset a931e44ffbe1 by Mark Dickinson in branch '3.2':
Issue #15544: Fix Decimal.__float__ to work with payload-carrying NaNs.
http://hg.python.org/cpython/rev/a931e44ffbe1

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<http://bugs.python.org/issue15544>
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