Those are great questions that not every system is required to address in the same way. (In a similar vein, +0 != -0 in Java) This is breakdown in notation and/

Those are great questions that not every system is required to address in the same way. (In a similar vein, +0 != -0 in Java) This is breakdown in notation and/or convention. There is no ground truth, just what's true within the system.