Agreed; a good company will stand behind a prior offer, within reason. Twice I've gone back to someone who had given me an offer and said "I screwed up, would

Agreed; a good company will stand behind a prior offer, within reason. Twice I've gone back to someone who had given me an offer and said "I screwed up, would you still consider me?" a year later, and had an instant and very positive response. (I had to do a fake interview at one of those, but just to satisfy HR).