nt(template, el) {
        let model;
        while (el) {
          // An element with a __templatizeInstance marks the top boundary
          // of a scope; walk up until we find one, and then ensure that
          // its __dataHost matches `this`, meaning this dom-repeat stamped it
          if ((model = el.__templatizeInstance)) {
            // Found an element stamped by another template; keep walking up
            // from its __dataHost
            if (model.__dataHost != template) {
              e