Antoine Pitrou added the comment:

> > Why not add a is_nan() method to float numbers instead?
> 
> Do you mean replacing math.isnan(x) by x.is_nan() to avoid the issue
> altogether? I'm not sure that's possible given that math just wraps
> the C library.

Yup. By calling x.is_nan() you would by construction get an
implementation that's correct for x's type. If x is a float, it would
obviously re-use math.isnan() (or have a similar implementation).

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue15544>
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