Stefan Krah added the comment:
I think math.isnan('snan') probably should not raise. Decimal('snan').is_nan()
just returns true and I am under the impression that IEEE 754 specifies the
same. I have to admit though that I just consulted Wikipedia for the latter:
"The predicate isNaN(x) determines if a value is a NaN and never signals an
exception, even if x is a signaling NaN."
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<http://bugs.python.org/issue15544>
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