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The behavior of IDBCursor.remove and IDBCursor.update is unspecified for when the cursor is at the end of the range. It seems clear we should raise an error, but I'm not sure which type is best.
Neither specifies what should returned in the result. I'm assuming null?
Comment #0 is now covered (by http://dvcs.w3.org/hg/IndexedDB/rev/8716288a4fe1) Do we want to return null or undefined for comment #1? I've been leaning more towards undefined since these APIs don't return objects but rather values.
I went with undefined.