Unsigned​(System.​Numerics.​Complex)

z with each zero part read as +0. The library has no signed zero, so a real
number is on the upper side of every branch cut it lies on; Complex computes -0 as a part of many real values, cos(2) and conj(-2) among them, and reads
it as the lower side, which made ln(cos(x)) at 2 the conjugate of the logarithm. Adding +0 turns -0 into +0 and changes no other number. Taken at the entry of every function with a cut.
https://github.com/asc-community/AngouriMath/issues/2236