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I mentored a solution to this exercise where the user ended up with
sublist : List I32, List I32 -> [Equal, Sublist, Superlist, Unequal] where a implements Eq
as their type which I don't think should be allowed by the compiler. I think it would be best to keep types the types fully specialized by default so that they are very straightforward for the users and we don't have to introduce abilities unnecessarily.