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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With -NaN as input, your function returns -NaN instead of +NaN.
On some implementations yes, but I _think_ that's within allowed behavior for fabs(), so it's technically not incorrect.