[issue18842] Add float.is_finite is_nan is_infinite to match Decimal methods

[Martin Panter]

Martin Panter added the comment:

While I don’t have much opinion either way, here is a patch to remove the existing dead code should that be the eventual outcome.

If the default implementations in the base class deferred to math.isfinite() etc, that may help with compatibility.

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versions: +Python 3.7 -Python 3.4
Added file: http://bugs.python.org/file46451/rm-finite.patch

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