As far as I understand, and if no extra care is taken on the part of the programmer: the extra copying, since you would have to copy over the data from one vari

As far as I understand, and if no extra care is taken on the part of the programmer: the extra copying, since you would have to copy over the data from one variable to another instead of just using and moving around pointers. In Parasail's case, you can choose to use "move" (move value from left side to over to the right side) and "swap" (swap the values of the left and right side), which will avoid the copying.