关于MapRequestPayload的使用:

//对于 JSON API 添加 format: 'json'

#[Route(path: '/api/register', name: 'api_register', methods: ['POST'], format: 'json')]

参考: https://symfony.com/doc/current/controller.html#mapping-request-payload

php8.2之为readonly properties 设置默认值:

https://www.php.net/releases/8.2/en.php#readonly-properties-default-values