[docs] [issue18841] math.isfinite fails with Decimal sNAN

[Berker Peksag]

Changes by Berker Peksag <berker.peksag at gmail.com>:


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resolution:  -> wont fix
stage:  -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18841>
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