bug(genType): `@genType @as("0")` generates type `0` not `"0"`

[iamchanii]

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• Is it a bug? Usage questions should often be asked in the forum instead.
• Concise, focused, friendly issue title & description.
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---

Hi there! I'm try to using variant interop with ReScript v11-rc.5. here is some snippet from my codes:

@genType
type tabIndex = | @as("0") Activity | @as("1") UserKeyword

And generated js code is fine as hopefully as what I expected

  var match$1 = searchParams.get("tabIndex");
  var tabIndex;
  if (match$1 == null) {
    tabIndex = undefined;
  } else {
    switch (match$1) {
      case "0" :
          tabIndex = "0";
          break;
      case "1" :
          tabIndex = "1";
          break;
      default:
        tabIndex = undefined;
    }
  }

I expect above code should be generate "0" | "1" as string union type, but actually I got 0 | 1 as numeric union type.

export type tabIndex = 0 | 1;

[cristianoc]

Good catch.
#6487