Hi! I wanted to ask what is the difference between the current
implementation of math.Abs and the following:
```go
func Abs(x float64) float64 {
if x < 0 {
return -x
}
return x
}
```
math.Abs would appear to return a copy of the input with the sign bit set
to zero. I tried the special conditions of NaN (the one returned by
math.NaN()), +Inf, and -Inf and the above would appear to work the same.
I guess my main question is: would "-x" behave differently under any
condition? Was there a particular motivation for the current
implementation? Not judging nor asking for any change, just trying to learn.
Thank you!
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