One language that uses the tuple argument convention described in the article is Standard ML. In Standard ML, like OCaml and Haskell, all functions take exactly one argument. However, while OCaml and Haskell prefer to curry the arguments, Standard ML does not.

There is one situation, however, where Standard ML prefers currying: higher-order functions. To take one example, the type signature of `map` (for mapping over lists) is `val map : ('a -> 'b) -> 'a list -> 'b list`. Because the signature is given in this way, one can "stage" the higher-order function argument and represent the function "increment all elements in the list" as `map (fn n => n + 1)`.

That being said, because of the value restriction [0], currying is less powerful because variables defined using partial application cannot be used polymorphically.

[0] http://mlton.org/ValueRestriction

I didn't know Standard ML, that's interesting.

And yeah I think this is the way to go. For higher-order functions like map it feels too elegant not to write it in a curried style.