code: function _sortPropertyContainers(obj, key) {
          if (_smellsLikeAPropertyContainer(obj)) {
              return _.mapValues(obj, _sortElements);
          }
          else {
              return obj;
          }
      }
docs: ### `_sortPropertyContainers()` Called for each key,obj in an Element, this processes each object that smells like a 'property container', which includes vertex `properties` hashmaps, and `inE` and `outE` edges.