return closure
    }

    @Override
    <T> T decorate(String registrationPoint, Class<T> cls, T listener) {
        listener
    }

    @Override
    Object decorateUnknownListener(String registrationPoint, Object listener) {
        listener
    }

     * @param listener the listener object to decorate
     * @see #decorate(String, Class, Object)
     */
    Object decorateUnknownListener(String registrationPoint, Object listener);