docs: function() {
                      can.Model._reqs--;
                      // Don't clean up unless we have no pending requests.
                      if (!can.Model._reqs) {
                          for (var id in this.store) {
                              // Delete all items in the store without any event bindings.
                              if (!this.store[id]._bindings) {
                                  delete this.store[id];
                              }
                          }
                      }
                      return arguments[0];
                  }