My answer to "implement fabs(), incorrectly". Seven and one third internet points to anyone who can say why it's incorrect, without looking up the spec. Hint: It's implementation defined. (Using C99 semantics because that's the only one I know reasonably well. :)https://twitter.com/oe1cxw/status/1144274172253822976 …
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Does it treat NaNs incorrectly in some way? Alternately, might it return -0 sometimes?
