Method lower

src/test/java/org/mapdb/BTreeSet2Test.java:872–875

(int element)

               final BitSet bs) {
        class ReferenceSet {
            int lower(int element) {
                return ascending ?
                        lowerAscending(element) : higherAscending(element);
            }
            int floor(int element) {
                return ascending ?
                        floorAscending(element) : ceilingAscending(element);