],
                        'locale' => '%kernel.default_locale%',
                        'locales' => '%kernel.translator.fallbacks%',
+                       //XXX: revert to underscore because of that shit:
+                       //XXX: see https://symfony.com/doc/current/components/config/definition.html#normalization
+                       //XXX: see https://github.com/symfony/symfony/issues/7405
                        'languages' => '%rapsys_user.languages%',
                        'path' => [
                                'cache' => '%kernel.project_dir%/var/cache',