Unicode strings inside the first argument to Printf.sprintf get garbled

[feihong]

Here's a simple example:

let message = Printf.sprintf({js|Greetings and 你好, %s!|js}, "Jon");
Js.log(message);

This produces

Greetings and ä½ å¥½, Jon!

Playground link

---

Interestingly, native OCaml doesn't have this problem:

% ocaml
OCaml version 5.0.0
Enter #help;; for help.

# Printf.printf {js|Greetings and 你好, %s!|js} "Jon";;
Greetings and 你好, Jon!- : unit = ()
#