rop, props) {
        userForwardHostProp.call(template.__templatizeOwner,
          prop.substring('_host_'.length), props[prop]);
      }
    }

    function addNotifyEffects(klass, template, templateInfo, options) {
      let hostProps = templateInfo.hostProps || {};
      for (let iprop in options.instanceProps) {
        delete hostProps[iprop];
        let userNotifyInstanceProp = options.notifyInstanceProp;
        if (userNotifyInstanceProp) {
          klass.prototype._addPropertyEffect(iprop,
    