docs: public boolean contains(long[] bitset) {
      for(int i = 0; i < bitset.length; i++) {
        final long b = bitset[i];
        if(i >= bits.length && b != 0L) {
          return false;
        }
        if((b & bits[i]) != b) {
          return false;
        }
      }
      return true;
    }