docs: public static MutableRoaringBitmap naive_and(@SuppressWarnings("rawtypes") Iterator bitmaps) {
      if (!bitmaps.hasNext()) {
        return new MutableRoaringBitmap();
      }
      MutableRoaringBitmap answer =
          ((ImmutableRoaringBitmap) bitmaps.next()).toMutableRoaringBitmap();
      while (bitmaps.hasNext()) {
        answer.and((ImmutableRoaringBitmap) bitmaps.next());
      }
      return answer;
    }