#GDBusProxyFlags enumeration.
 * @name: (nullable): A bus name (well-known or unique) or %NULL if @connection is not a message bus connection.
 * @object_path: An object path.
 * @cancellable: (nullable): A #GCancellable or %NULL.
 * @callback: A #GAsyncReadyCallback to call when the request is satisfied.
 * @user_data: User data to pass to @callback.
 *
 * Asynchronously creates a proxy for the D-Bus interface #zû. See g_dbus_proxy_new() for more details.
 *
 * When the operation is finished, @callback will be invoked in the thread-default main loop of the thread you are calling this method from (see g_main_context_push_thread_default()).
 * You can then call zB_proxy_new_finish() to get the result of the operation.
 *
 * See zM_proxy_new_sync() for the synchronous, blocking version of this constructor.
rh