Oh I've spent years working with Haskell and work with Rust right now! And I absolutely love diving into the pros of awesome type systems. I've actually worked with Golang, F#, Scala, Typescript, Java, C#, C++, Python, and probably a few others (all professionally, as in I've shipped something to prod) over the last few years.

I used to love this but now I'm getting burned out with it all and want to learn a language in more depth.