Performs a bitwise XNOR (NOT XOR) operation on one or more integers.
xnor(value1, [value2, ...])
Single value, returns NOT of itself
xnor(5); // returns 4294967290 (~5)
Bitwise XOR of 5 (0101) and 3 (0011) → 0110
Bitwise NOT of 0110 → 1001
xnor(5, 3); // returns 4294967289
Bitwise XOR of 1 (0001), 2 (0010), and 3 (0011)
Bitwise NOT of 0000 → 1111
xnor(1, 2, 3); // returns 4294967295