Any Way To Define Finite Set for Cases That Handle Like Enums?

General Feedback & Requests
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Is there any way to create a finite set that can be used like an enum can to limit the amount of possible values for a case?

To be clear I know how to use enums here, what I’m looking for is any possible alternative, this is for science and additional methods rather than solving a specific issue so no need to offer solutions to this that involve what I’m trying to work around (may as well save people the time).

rank_int<public>:=type{_X:int where 0 <= _X, _X <= 18}

ToRank(RankInt:rank_int)<transacts>:rank_enum=
    case(RankInt):
        0 => rank_enum.Unranked
        1 => rank_enum.Bronze1
        2 => rank_enum.Bronze2
        3 => rank_enum.Bronze3
        4 => rank_enum.Silver1
        5 => rank_enum.Silver2
        6 => rank_enum.Silver3
        7 => rank_enum.Gold1
        8 => rank_enum.Gold2
        9 => rank_enum.Gold3
        10 => rank_enum.Platinum1
        11 => rank_enum.Platinum2
        12 => rank_enum.Platinum3
        13 => rank_enum.Diamond1
        14 => rank_enum.Diamond2
        15 => rank_enum.Diamond3
        16 => rank_enum.Elite
        17 => rank_enum.Champion
        18 => rank_enum.Unreal
        # _ => rank_enum.Unranked   <- This will be required here to handle all other ints, what i'm looking for is the ability to not have to include the 'else' case here, I would like a finite defined set

Any way to achieve this outside of using enums would be awesome to know about. Thanks.

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@LionUnchained Thank you for your feedback. While I cannot guarantee a response, I can confirm that this has been forwarded to the appropriate team.