Submitted by cmichel
When LibMath.abs is called with -2^255 (type(int256).min), it tries to multiply it by -1 but itll fail as it exceeds the max signed 256-bit integers. The function will fail with an implicit error that might be hard to locate.
Recommend throwing an error similar to toInt256 like int256 overflow.
raymogg (Tracer) confirmed
