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Had a conversation with someone today who thought LEFT_BOUND and LEFT_OPEN were mutually exclusive. I think it couldn't hurt for the spec to be a bit more clear about what the flags mean and make it clear that, for example, LEFT_BOUND will be set iff bound or leftBound are used to create the key range.
Fixed by http://dvcs.w3.org/hg/IndexedDB/rev/e5a08025e518