On Sat, Dec 28, 2019 at 09:35:07PM -0800, Christopher Barker wrote:
> On Sat, Dec 28, 2019 at 3:40 PM David Mertz <mertz@gnosis.cx> wrote:
>
> > What about Decimal snan?
> >
>
> That version tries to call .is_nan() first, so works fine with the Decimal
> snan.
>
> But as Nark pointed out, having an s an raise maybe the right thing to do
> anyway— it should not be used to indicate a missing value anyway.

Merely testing whether a value is a NAN or not should not trigger the
"signalling" part of a signalling NAN. Only comparisons and mathematical
operations on sNANs should signal.

Support for floating point sNANs is patchy and hardware dependent.
See here for more discussion:

https://mail.python.org/archives/list/python-dev@python.org/thread/35NECLGFIVAHWTIPAYDBJOJJX3FSY233/


--
Steven
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