你以为的 null 不是真的 null，但 bug 是真的 bug！ 刷到一篇搞笑的帖子： 用户取用户名为 "null"！ 是的，你没看错，不是 Java 里的null，不是 SQL 里的NULL，而是一个货真价实的字符串 "null"！这玩意儿乍一看人畜无害，但只要你代码里稍不注意，它就能让你怀疑人生。

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