I have given people more than they've asked for a couple of times (usually if they've asked for something that I know to be under market rate and I don't want them jumping ship in a year). But yeah... as a hiring manager I want to know what your expectation is because that's what I'm going to take into consideration when I compare you against other people I've interviewed.

i.e. Dev A has everything but costs 20% more than Dev B, who I think can pick up everything we need within a year's time. Or, Dev C has claimed to have done all of these different things, but is asking for an amount that is suspiciously low.

If you have only one offer, then that could happen, but it's unlikely if you have more than one offer or at least several interviews (and I would always mention this).