I recommend Rustler. If you use OCaml you need to know the ‘tricks’ to not accidentally pass managed memory across the interface or so and deal with them when you do, that’s a lot to learn to do it right (though if you already know OCaml that well then I can teach the NIF bindings easily enough). Absolutely use Rust instead.

/me thinks golang is actually a pretty horrible and poorly designed language…

Its very hard to interact with Go natively (C-Port or NIF), many boilerplating that were done in C by a handfull of macros has to be done individually per go-package or targeted BEAM-module, just because there are no mechanics for abstracting it away.

This makes it unlikely to be a candidate to use it alongside erlang/elixir/lfe/alpaca/BEAM in my eyes.