I think they were referring to -0 in floating point, which does exist as a separate value from +0 https://en.m.wikipedia.org/wiki/Signed_zero https://en.m.wikip

I think they were referring to -0 in floating point, which does exist as a separate value from +0 https://en.m.wikipedia.org/wiki/Signed_zero https://en.m.wikipedia.org/wiki/Signed_zero