 this._parentModel,
          instanceProps: this._instanceProps,
          forwardHostProp: this._forwardHostPropV2,
          notifyInstanceProp: this._notifyInstancePropV2
        });
      },

      /**
       * Creates an instance of the template prepared by `templatize`.  The object
       * returned is an instance of the anonymous class generated by `templatize`
       * whose `root` property is a document fragment containing newly cloned
       * template content, and which has property accessors co