docs: public ChildData getCurrentData(String fullPath)
      {
          TreeNode node = find(fullPath);
          if ( node == null || node.nodeState != NodeState.LIVE )
          {
              return null;
          }
          ChildData result = node.childData;
          // Double-check liveness after retreiving data.
          return node.nodeState == NodeState.LIVE ? result : null;
      }