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Per the "[IndexedDB] Callback order" thread [1], we should specify the order of async callbacks (either onsuccess or onerror) to fire in the order that the async requests are made. I.e. the same order the IDBRequest objects are returned. [1] http://www.mail-archive.com/public-webapps@w3.org/msg09208.html
Fixed by http://dvcs.w3.org/hg/IndexedDB/rev/26e7d99ab935 It's a quite complicated checkin so please do check that things look good.