code: public Object[] getSuperSetWithClassifier(C key) {
          if (key == null) {
              return getAllElements();
          } else {
              int index = (key.hashCode() & 0x7FFFFFFF) % elements.length;
      
              return CompactSet.getElements(elements[index]);
          }
      }
docs: /*
  Returns a CompactSet-compatible object with the given classifier. Note that
  extra elements could be returned -- hence "super set". It is the
  responsibility of the caller to weed these out