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我刚开始使用 Git,我想知道“git status”到底在检查什么。它实际上是在每次运行时对每个跟踪的文件进行哈希处理,还是使用一些提示指标(如修改的时间戳和大小)来判断它应该扫描哪些文件以进行修改?