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Comment by jacobvosmaer

I tried plan9port's mk for a moment out of curiosity. I quickly ran into an annoying usability problem: it compares file mtimes with second accuracy.

https://github.com/9fans/plan9port/blob/cc4571fec67407652b03...

With sub-second build times for individual targets, this causes mk to needlessly recompile files because the target may have the same mtime as the prerequisites.

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