code: function _traverseSubtree(meta, obj, fns) {
      _pushNotifications(meta, obj, fns);
      for (var key in meta) {
        if (key === nfs) {
          continue;
        }
        var subobj;
        if (obj) {
          subobj = obj[key];
        }
        _traverseSubtree(meta[key], subobj, fns);
      }
    }
docs: Append notificaitons for entire subtree.