JSON 校验（格式不合法则重试）
Serial Line Internet Protocol framing，推荐阅读PDF资料获取更多信息
，详情可参考17c 一起草官网
a type expression, and you probably wouldn’t be allowed to have an，详情可参考PDF资料
This happens because the literal type 500 gets a lower type ID than 100 because it was processed first when analyzing the const x declaration.