Inc. or dec. value: 0: no inc-/decrement, 1 .. 8: increment by 1 .. 8, -1 .. -8: decrement by 1 .. 8.
See Implementation
Inc. or dec. value: 0: no inc-/decrement, 1 .. 8: increment by 1 .. 8, -1 .. -8: decrement by 1 .. 8.