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你有没有遇到过这种情况：同事帮你改了一个小bug，你打开代码一看，diff里密密麻麻几十行改动，而你原本以为只需要改一个字符。你花了半小时才搞清楚他到底动了什么，最后发现真正修复bug的那行代码只有一处，其余全是"顺手"加的。