Optional lowerOpen: booleanOptional upperOpen: booleanReturns a new IDBKeyRange starting at key with no upper bound. If open is true, key is not included in the range.
Optional open: booleanReturns a new IDBKeyRange spanning only key.
Returns a new IDBKeyRange with no lower bound and ending at key. If open is true, key is not included in the range.
Optional open: boolean
Returns a new IDBKeyRange spanning from lower to upper. If lowerOpen is true, lower is not included in the range. If upperOpen is true, upper is not included in the range.
MDN Reference