Thanks for all the input!
I don't know if I agree that it's a slippery slope, since copysign seems to
me of a different nature compared to e.g. sin.
How important to use this: Many languages do feature a sign function, if
that's of any worth. copysign is python's closest built-in equivalent.
I d
The math.copysign(x, y) function always returns a float, even when the
given x is an int, i.e. math.copysign(3, -1) gives -3.0. This is documented
behaviour, but I find it somewhat surprising given that the name suggests
that it only copies a sign, and it's also annoying in situations when an
int i
