Post #1436080

@quixoticgeek @aral @ammdias @iaruffell Ideally you never want to reuse a user ID when someone leaves, because it might be in use somewhere as a file ownership. And there are reasons you might want to generate temporary/transient users frequently. So you don't ever need anywhere near 260 million users to run into trouble. Unfortunately Windows seems to have the edge here, with its bulky SIDs.