The reason is that csv.vim is mostly useless in large files (it seems to get
stuck trying to figure out columns or something); since Polyglot doesn't allow
disabling a single element, I just picked the plugins listed there that I use
and added them as submodules.
I didn't figure out how to make it work, but I think I can make something close
to it myself -- the only real feature I need is jumping between code and tests.