ninny-json：JSON类型类，知道空字段和缺席字段之间的区别-源码
没有不为空
ninny-json是一项实验，旨在查看JSON类型类在不存在的JSON字段和具有null值的字段之间进行区分时的外观。 该项目确实包含其自己的AST，但是这里的重点实际上不是引入新的AST或研究直接操纵AST的人体工程学。 因此，包含的AST保持简单。 为什么不使用json4s这个项目创建来提供一个统一的AST？ 继续阅读。
为什么这么重要？
原则上，我们希望我们的库尽可能具有表现力。 实际上，当今库的局限性使得很难或不可能实现或。 是否将字段包含在最终JSON中还取决于JSON序列化程序的配置（是否包含空值），而不是AST。 当AST与JSON输出不匹配时，就会出现可测试性问题。
图书馆今天做什么？
让我们看一下三个流行的库，看看它们如何处理Option[A]与JSON之间的转换。
json4s
json4s使用以下类型类
trait Reader [ T ] {
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