I know double semicolons are a thing, but I’ve never had to use them. I forget what they’re for, but yeah it’s supposed to be an escape hatch for something that shouldn’t be happening iirc.

The curried snd uncurried functions… Maybe you are confusing with SML, because everything in ocaml is curried by default. Though admittedly the standard library could be more complete, but I personally am happy to use third party dependencies for less common things.