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ref nim-lang/RFCs#92
C99 function
http://www.cplusplus.com/reference/cmath/copysign/
Python:
https://docs.python.org/3/library/math.html#math.copysign
Crystal:
https://github.com/crystal-lang/crystal/blob/5999ae29beacf4cfd54e232ca83c1a46b79f26a5/src/math/math.cr#L95
Dlang:
https://dlang.org/library/std/math/copysign.html
Rust:
https://doc.rust-lang.org/beta/std/primitive.f64.html#method.copysign