STINNER Victor <vstin...@python.org> added the comment:

Oh, I forgot to also give the nextafer() link to the POSIX standard:
https://pubs.opengroup.org/onlinepubs/009695399/functions/nextafter.html

It mentions for example "If x== y, y (of the type x) shall be returned" and "If 
x or y is NaN, a NaN shall be returned". It's good to know that it's specified 
;-)

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<https://bugs.python.org/issue39288>
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