Ideally a bridge (e.g. a typeclass) with nice language support like Scala has. I'm not seeing what's so ugly. In math, you have an abstract interface for e.g. monoids (your interface like a Table). Then you have e.g. complex numbers as a set (your business model). The you can identify how C is a monoid via addition. And how it's also separately a monoid via multiplication. Same idea. There's nothing "ugly" about having to write down what you mean.