When used in `switch`, escape sequences (of strings) are compiled incorrectly

[LuKuangChen]

let f = s => {
  switch s {
  | "\\" => "backslash"
  | "\"" => "doublequote"
  | _ => "other"
  }
}
let s1 = "\\"
let s2 = "\""

actual output (by the latest playground as of today)

function f(s) {
  switch (s) {
    case "\\\"" :
        return "doublequote";
    case "\\\\" :
        return "backslash";
    default:
      return "other";
  }
}

var s1 = "\\";
var s2 = "\"";

I expect the two cases to be case "\"" and case "\\" instead. Not that escape sequences that are used outside the switch-case context are translated appropriately.