Add support for [@mel.unwrap] in @mel.obj #679
Description
Ported from rescript-lang/rescript#2827 (cc @liubko as original author).
Can't use [bs.unwrap] with labeled arguments.
Code
[@bs.obj]
external func :
(
~param: string,
~polyParam: [@bs.unwrap] [ | `Str(string) | `Int(int)],
unit
) =>
_ =
"";
Error
@obj label polyParam does not support @unwrap arguments