Mark Dickinson added the comment:
> Decimal('snan').is_nan()
> just returns true and I am under the impression that IEEE 754 specifies > the
> same.
Sure, but IEEE 754 also specifies that math.sqrt(<signalling nan>) should
signal. Since both math.sqrt and math.isnan are going through __float__, we
can't keep everyone happy here.
The question for me is really what __float__ should do. IEEE 754 doesn't help
here, since it doesn't cover decimal floating-point <-> binary floating-point
conversions.
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