cs: Switch to a stricter way of coding - this might break in a lot of places.

src/Bundle/ChillMainBundle/DependencyInjection/CompilerPass/MenuCompilerPass.php

@@ -7,6 +7,15 @@
  * the LICENSE file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
+/**
+ * Chill is a software for social workers.
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
 namespace Chill\MainBundle\DependencyInjection\CompilerPass;
 
 use Chill\MainBundle\Routing\MenuComposer;
@@ -36,7 +45,7 @@ class MenuCompilerPass implements CompilerPassInterface
         }
 
         usort($services, static function ($a, $b) {
-            if ($a['priority'] == $b['priority']) {
+            if ($a['priority'] === $b['priority']) {
                 return 0;
             }