From: "Arnaud Delobelle" <arnodel@googlemail.com>
I would go through the whole of setobjects.c and try to do this for each relevant method. However I have not touched Python source code before, and I am not at all confident that I would make a good job of it. If someone offered to review my effort privately, I'd be happy to have a go but OTOH I don't want to waste anyone's time.
It's up to you. If you can get a reviewer and want to go for it, that's fine. Otherwise, you can wait on me to get to it (it's been on my list for several months). In the case of intersection and intersection_update, if the inputs are sets or dicts, then they should be processed smallest to largest. If the inputs are not sets or dicts, then process them in input order. The other six cases should also be processed in-order (left-to-right). Raymond