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The spec refers to the various bounds of IDBKeyRange as right and left bounds. It then defines left as being a lower bound and right as being an upper. It seems silly not to just name the bounds upper and lower rather than right and left. At very least, the text in http://www.w3.org/TR/IndexedDB/#range-concept could be more clear.
Fixed by http://dvcs.w3.org/hg/IndexedDB/rev/e5a08025e518