Thanks! This is interesting, although I'd be worried about how stable this is for the long term. Would be happy to have my worries annihilated of course :)
It depends how good/low level a programmer you are, but it's really not that hard to spin up your own impl. I did an (incomplete) Python multiprocessing like dealio in like 100 lines of code (https://github.com/c-blake/cligen/blob/master/cligen/procpoo...) just to make my `only.nim` run faster because libmagic/file are so CPU intensive. So, one way to annihilate your worries is to just roll your own.
In short, I think at least for the linked to table you mentioned, Nim does check all the boxes.