[issue29282] Fused multiply-add: proposal to add math.fma()

[Mark Dickinson]

Mark Dickinson added the comment:

Serhiy, Victor: thanks for the reviews. Here's a new patch. Differences w.r.t. the old one:

- Converted to argument clinic.
- Updated docstring to talk about special cases.
- More tests, as suggested by Serhiy.
- whatsnew entry and ..versionadded in docs.

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<http://bugs.python.org/issue29282>
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