It can be both AND and XOR because it has two outputs. You could add a 3rd output for NOR in theory. You would probably add a 3rd always-on stream that drains i

It can be both AND and XOR because it has two outputs. You could add a 3rd output for NOR in theory. You would probably add a 3rd always-on stream that drains into the NOR output by default but is deflected away when either or both of the other streams comes through.