I tried doing that for my program and failed miserably, mostly because CLR is not optimised the same way the OCaml runtime is optimised to minimise copying of m

I tried doing that for my program and failed miserably, mostly because CLR is not optimised the same way the OCaml runtime is optimised to minimise copying of memory. As a result the (direct translation of the) program became more than 5 times slower, which was a deal breaker for this use case. Yes, there are ways to write it in a .NET-y way in F#, but then it requires a "complete" rewrite and F# gives no real benefits with "being similar". In contrast, after that I migrated to Rust and I am delighted. I wrote about it here: https://news.ycombinator.com/item?id=24893285 https://news.ycombinator.com/item?id=24893285 Of course, this is also a full-rewrite without using the same idioms as in OCaml (mostly because I mutate objects directly when needed) but I still think it's much better than F# as the language (Rust) is miles ahead in the practicality domain. Indeed, it's much better than anything I've seen so far. And still so very much "functional" and "elegant". I just miss the transparent currying from OCaml.