In mathematics: 2+2=4 ... but 2.0+2.0 may not = 4.0
Why?
Because it could be: 2.0[4]+2.0[3] would = 4.07 or 4.1
QED
(Integers are almost godlike)
Afterthought: I’m not sure that zero cannot be signed ... IMHO +7-7 would better represent +0 ... while -7+7 would signify -0. And, if zero could not be signed, what is the meaning of the absolute value of zero.

