[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.

[jmrjmr]

That looks like it would be relatively straightforward to fix. Attempted nerd snipe?