alt Hacker NewsMy experience has been about 50/50 with that. Twice when I haven't given the number first, they've pleasantly surprised me with significantly higher offers than I would have expected. Twice when I did give a number, they said "oh no that's way too low, we want you to be extremely happy with comp" and bumped me up. In all other circumstances I don't think it mattered, and I suspect that giving the number or not was moot in all 4 of those cases.
In the second example, it's likely that you still left money on the table. They almost certainly gave you the lower/midrange of your projected band which was likely significantly above the number you gave.
Hard to say from a blurb whether the situation is an outlier, just generalizing here based on on basically every salary discussion I see on the hiring side.