package and depencies

vendor/symfony/var-dumper/VarDumper.php

@@ -37,7 +37,7 @@ class VarDumper
      */
     private static $handler;
 
-    public static function dump($var)
+    public static function dump(mixed $var)
     {
         if (null === self::$handler) {
             self::register();
@@ -46,11 +46,11 @@ class VarDumper
         return (self::$handler)($var);
     }
 
-    /**
-     * @return callable|null
-     */
-    public static function setHandler(callable $callable = null)
+    public static function setHandler(callable $callable = null): ?callable
     {
+        if (1 > \func_num_args()) {
+            trigger_deprecation('symfony/var-dumper', '6.2', 'Calling "%s()" without any arguments is deprecated, pass null explicitly instead.', __METHOD__);
+        }
         $prevHandler = self::$handler;
 
         // Prevent replacing the handler with expected format as soon as the env var was set: