Method put

src/test/java/org/mapdb/BTreeSet2Test.java:776–779

(NavigableSet<Integer> set, int element, BitSet bs)

    }

    void put(NavigableSet<Integer> set, int element, BitSet bs) {
        if (set.add(element))
            bs.set(element);
    }

    void remove(NavigableSet<Integer> set, int element, BitSet bs) {
        if (set.remove(element))