xor

Pops two items from the stack, treats them as boolean values, 'xors' (exclusive or) them, and pushes 0 or 1 back to the stack.

If both items are TRUE, 0 is pushed to the stack. If both items are FALSE, 0 is pushed to the stack. If one item is TRUE and the other is FALSE, 1 is pushed to the stack.

TRUE TRUE Trace     #prints out 0 (FALSE) to the tracelog
TRUE FALSE Trace    #prints out 1 (TRUE) to the tracelog
FALSE TRUE Trace    #prints out 1 (TRUE) to the tracelog
FALSE FALSE Trace   #prints out 0 (FALSE) to the tracelog