# Functions
统一用json.
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1.不会自动清理backup 2.每200mb压缩一次，不按时间rotate.
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Lumberjack logger虽然持有File但没有暴露sync方法，所以没办法利用zap的sync特性 所以额外返回一个closer，需要保证在进程退出前close以保证写入的内容可以全部刷到到磁盘.
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# Type aliases
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