Are negative numbers supported?

[olehmisar]

Can't find anything in the README

[ewynx]

Since a BigNum is a number modulo the modulus you are using, the concept of a "negative" element doesn't really exist. Also, when you use the predefined sets U256, U384, U512 etc, those are for unsigned integers.

On the other hand, when working modulo a number p, there is a wrap around so p-x would be the representation for "-x" and you could do arithmetic with those values. Edit: for example, neg functionality is available see here and this uses the wraparound, see here)

The README was updated yesterday, so maybe it's clearer now