# Functions
把 Map 序列化为 JSON，再反序列化为 Map ，再序列化为 JSON 测试序列化与反序列化过程中，哪些字段类型会被改变.
将结构体定义的字符串解析为 JSON 默认值.
将结构体转换为 JSON 字符串，并为每个字段填充默认值.
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# Structs
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头条V2.0 广告系列维度结构体.
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