public void intersect(DirectBitMap other) {
        assert wlen == other.wlen;
        // testing against zero can be more efficient
        int pos = wlen;
        while (--pos >= 0) {
            setWord(pos, word(pos) & other.word(pos));
        }
    }
this = this AND other

@param other The bitset to intersect with.
indexr-common/src/main/java/io/indexr/util/DirectBitMap.java