docs: public boolean checkedRemove(final int x) {
      final short hb = BufferUtil.highbits(x);
      final int i = highLowContainer.getIndex(hb);
      if (i < 0) {
        return false;
      }
      MappeableContainer C = highLowContainer.getContainerAtIndex(i);
      int oldcard = C.getCardinality();
      C.remove(BufferUtil.lowbits(x));
      int newcard = C.getCardinality();
      if (newcard == oldcard) {
        return false;
      }
      if (newcard > 0) {
        ((MutableRoaringArray) highLowContainer).setContainerAtIndex(i, C);
      } else {
        ((MutableRoaringArray) highLowContainer).removeAtIndex(i);
      }
      return true;
    }