From d8c13d35f68c69e15595fe37fa2c225d11c10f7e Mon Sep 17 00:00:00 2001
From: Nicolas Grekas <nicolas.grekas@gmail.com>
Date: Tue, 19 Mar 2024 11:13:26 +0100
Subject: [PATCH] Make more nullable types explicit

---
 ParameterBag.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ParameterBag.php b/ParameterBag.php
index e1f89d69e..b542292bc 100644
--- a/ParameterBag.php
+++ b/ParameterBag.php
@@ -39,7 +39,7 @@ public function __construct(array $parameters = [])
      *
      * @return array
      */
-    public function all(/* string $key = null */)
+    public function all(/* ?string $key = null */)
     {
         $key = \func_num_args() > 0 ? func_get_arg(0) : null;