[issue46640] Python can now use the C99 NAN constant

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

> If a platform doesn't implement NaN, it should define the Py_NO_NAN macro

Ah. In that case your PR description (and the PR news entry) is misleading:

> Building Python now requires a C99 <math.h> header file providing the
> NAN constant.

Please could you update them?

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