--- a/wp/wp-includes/IXR/class-IXR-client.php	Tue Oct 22 16:11:46 2019 +0200
+++ b/wp/wp-includes/IXR/class-IXR-client.php	Tue Dec 15 13:49:49 2020 +0100
@@ -58,9 +58,15 @@
 		self::__construct( $server, $path, $port, $timeout );
 	}
 
-    function query()
+	/**
+	 * @since 1.5.0
+	 * @since 5.5.0 Formalized the existing `...$args` parameter by adding it
+	 *              to the function signature.
+	 *
+	 * @return bool
+	 */
+    function query( ...$args )
     {
-        $args = func_get_args();
         $method = array_shift($args);
         $request = new IXR_Request($method, $args);
         $length = $request->getLength();