I've run into this a lot, but I'm also not sure what I really want to happen. Even for progress bars, the behavior can be different depending on how exactly you're obtaining the denominator -- does it increase dynamically or is it known from the beginning? Is it one of those fake progress bars that just ignores the fact that it'll stay at 100% for the next hour, or would it filling up genuinely mean that the work is actually done? After all, if you have 0 operations total and you've finished 0 of them, are you really 0% done? Wouldn't it make more sense to say you're 100% done? At the end of the day the user is trying to figure out how long they should keep waiting, to which the answer would be "you don't need to wait, there's no more work left to do".
