message: Handle exclamation mark
diff: @@ -259,6 +259,11 @@ export const plugin: Plugin = {
  val = `{${val.substring(2, val.length)}`;
  }
  }
  +
  + if (token.mustEscape === false) {
  + result += '!';
  + }
  +
  result += `=${val}`;
  }
  break;
  