docs: private static RoaringBitmap selectRangeWithoutCopy(RoaringBitmap rb, final long rangeStart,
        final long rangeEnd) {
      final int hbStart = Util.toIntUnsigned(Util.highbits(rangeStart));
      final int lbStart = Util.toIntUnsigned(Util.lowbits(rangeStart));
      final int hbLast = Util.toIntUnsigned(Util.highbits(rangeEnd - 1));
      final int lbLast = Util.toIntUnsigned(Util.lowbits(rangeEnd - 1));
      RoaringBitmap answer = new RoaringBitmap();
  
      assert(rangeStart >= 0 && rangeEnd >= 0);
  
      if (rangeEnd <= rangeStart) {
        return answer;
      }
  
      if (hbStart == hbLast) {
        final int i = rb.highLowContainer.getIndex((short) hbStart);
        if (i >= 0) {
          final Container c = rb.highLowContainer.getContainerAtIndex(i).remove(0, lbStart)
              .iremove(lbLast + 1, Util.maxLowBitAsInteger() + 1);
          if (!c.isEmpty()) {
            answer.highLowContainer.append((short) hbStart, c);
          }
        }
        return answer;
      }
      int ifirst = rb.highLowContainer.getIndex((short) hbStart);
      int ilast = rb.highLowContainer.getIndex((short) hbLast);
      if (ifirst >= 0) {
        final Container c = rb.highLowContainer.getContainerAtIndex(ifirst).remove(0, lbStart);
        if (!c.isEmpty()) {
          answer.highLowContainer.append((short) hbStart, c);
        }
      }
  
      // revised to loop on ints
      for (int hb = hbStart + 1; hb <= hbLast - 1; ++hb) {
        final int i = rb.highLowContainer.getIndex((short)hb);
        final int j = answer.highLowContainer.getIndex((short) hb);
        assert j < 0;
  
        if (i >= 0) {
          final Container c = rb.highLowContainer.getContainerAtIndex(i);
          answer.highLowContainer.insertNewKeyValueAt(-j - 1, (short)hb, c);
        }
      }
  
      if (ilast >= 0) {
        final Container c = rb.highLowContainer.getContainerAtIndex(ilast).remove(lbLast + 1,
            Util.maxLowBitAsInteger() + 1);
        if (!c.isEmpty()) {
          answer.highLowContainer.append((short) hbLast, c);
        }
      }
      return answer;
    }