Sender's comparaison is strict, and allows nulls as expected

Author: sroze

src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php

@@ -1374,8 +1374,12 @@ private function registerMessageConfiguration(array $config, ContainerBuilder $c
 
         $messageToSenderMapping = array();
         foreach ($config['routing'] as $message => $messageConfiguration) {
-            $messageToSenderMapping[$message] = array_map(function (string $serviceName) {
-                return new Reference($serviceName);
+            $messageToSenderMapping[$message] = array_map(function (string $service) {
+                if (is_string($service)) {
+                    return new Reference($service);
+                }
+
+                return $service;
             }, $messageConfiguration['senders']);
         }
 

src/Symfony/Component/Message/Asynchronous/Middleware/SendMessageMiddleware.php

@@ -39,7 +39,7 @@ public function handle($message, callable $next)
                 $sender->send($message);
             }
 
-            if (!in_array(null, $senders)) {
+            if (!in_array(null, $senders, true)) {
                 return;
             }
         }