How to handle non-continuous ranges?

Is it possible to somehow include non-continuous ranges? For example. in computation, I'm using an `enum` (converted to its underlying type). The `enum` has a few possible values but the values do not form a continuous range. Of course, I could take the least range covering all possible values. But this would include more values than are truly possible and I'm afraid in some cases of complex computations it could impact the resulting range.