Mutually exclusive option groups behave strangely when given default values

[lcdevans]

• [Windows 10] OS
• [3.11.5 ] Python Version
• [ 1.0.8.1] Gooey Version
• add_mutually_exclusive_group is buggy when options are given default values
  • Behaviour is difficult to describe, but it seems like default options aren't correctly added if left at their default value. Try to run this code and you'll see what I mean.
  • I would have expected the code to work with args.first ==1 when first is selected, and likewise for args.second. As it is, this just crashes and says neither are selected.

Minimal reproducer:

@Gooey(program_name="Minimal Reproducer")
def main():
    parser = GooeyParser()

    mutex = parser.add_mutually_exclusive_group(
        required=True, gooey_options={"initial_selection": 0}
    )
    mutex.add_argument(
        "--first",
        type=int,
        default=1,
        help="First mutex argument."
    )
    mutex.add_argument(
        "--second",
        type=int,
        default=2,
        help=f"Second mutex argument.",
    )

    args = parser.parse_args()

    if hasattr(args, "first") and args.first is not None:
        print(f"first: {args.first}")
    elif hasattr(args, "second") and args.second is not None:
        print(f"second: {args.second}")


if __name__ == "__main__":
    main()

For my own usage I'm able to just enforce the behaviour I want by writing a little code, but this did not work the way I would have expected.