[yarg]

It's neutral (-1 * 0 ≡ +1 * 0); don't confuse it for an infinitesimal (which can be positive or negative).

[zeven7]

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

[lll-o-lll]

Nah, zero definitely feels a bit more positive to me.