Ok, it does... but it doesn't *just* update the attribute - it resaves the whole record. This is a problem if you aren't sure whether or not your record is fresh as you can overwrite other changes with your stale data.
Lesson:
As nasty as it is, you should do a do a self.reload before you do an update_attribute - if it's possible that your record has changed under you (eg by a called sub-method)
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