code: function(nodeList) {
                  var nodes = nodeLists.unregisterChildren(nodeList);
                  // If an 'unregisted' function was provided during registration, remove
                  // it from the list, and call the function provided.
                  if (nodeList.unregistered) {
                      var unregisteredCallback = nodeList.unregistered;
                      delete nodeList.unregistered;
                      delete nodeList.replacements;
                      unregisteredCallback();
                  }
                  return nodes;
              }
docs: ## nodeLists.unregister Unregister's a nodeList and returns the unregistered nodes. Call if the nodeList is no longer being updated. This will also unregister all child nodeLists.