Copper doors as XOR/EQUAL gates

Currently copper doors work like wooden doors. Since copper bulbs have a unique redstone function as T trigger, copper doors should also have some.

Upper and lower parts of a copper door can act as two inputs of an XOR gate, and the close/open state of the copper door acts as the output. The output can be read by a comparator.

If you manually close/open the copper door, it will become a EQUAL gate, and vice versa.