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See https://github.com/sulu/sulu/blob/d635d8dcaa8679c4ff5ab3f1f52a6fa7ea3bc53a/src/Sulu/Bundle/CoreBundle/CommandOptional/SuluBuildCommand.php#L25
Symfony only require return type for execut: https://github.com/symfony/symfony/blob/695bd1a93c0f99db31f8bb4f424165eb7947faa0/src/Symfony/Component/Console/Command/Command.php#L165