code: public void compact() {
          // Bare-bones iterator: no filter, don't bother with package strings
          for (NodeIterator<T> i = this.getNodeIterator(); i.hasNext();) {
              NodeIndex<T> n = i.next();
              if (n.node.exactKids != null)
                  n.node.exactKids.trimToSize();
          }
      }
docs: Compact any empty space after a read-only trie has been constructed