[Exposed=(Window,Worker)]
interface IDBKeyRange {
    readonly attribute any lower;
    readonly attribute any upper;
    readonly attribute boolean lowerOpen;
    readonly attribute boolean upperOpen;

    [NewObject] static IDBKeyRange only(any value);
    [NewObject] static IDBKeyRange lowerBound(any lower, optional boolean open = false);
    [NewObject] static IDBKeyRange upperBound(any upper, optional boolean open = false);
    [NewObject] static IDBKeyRange bound(any lower, any upper, optional boolean lowerOpen = false, optional boolean upperOpen = false);

    boolean includes(any key);
};