What? Really? OMG, Fennel is so nice. I'd use it for anything that needs Lua these days - neovim, hammerspoon, awesomewm, mpv, wezterm, etc. It's very mature and it even has an lsp-server implementation and a dedicated conference. It's incredible how you can reduce some big, nasty, unavoidable boilerplate in Lua just into a few lines of Fennel.