Document boolean constraint requirement for gates. #87
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Users might naturally assume that they can use gates with non binary inputs. For example, you might assume that
Or
of two non zero numbers is non zero, or perhaps1
. In fact it is not tightly constrained, and can even be0
ifa = 2
andb = 2
.This documents which circuits don't extend to non binary inputs, and gives a specific example of why not.