services:
    Symfony\Component\DependencyInjection\Tests\Fixtures\NamedArgumentsDummy: { 0: ~, $apiKey: ABCD }

    another_one:
        class: Symfony\Component\DependencyInjection\Tests\Fixtures\NamedArgumentsDummy
        arguments:
            $apiKey: ABCD
            Symfony\Component\DependencyInjection\Tests\Fixtures\CaseSensitiveClass: ~
        calls:
            - ['setApiKey', { $apiKey: '123' }]