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union ( int->string, string->int )" This is where I started out, but it doesn't seem right to me. The issue I see with this is that semantically, this should mean that eitherf2can contain a functionint->stringor a functionstring->int, but not both at the same time, which is what it actually is. I think this means it needs to have its own type constructor, perhapsproductas suggested by @svick. The use of type variables is an interesting idea I hadn't thought of though. I suspect it will be more complex, but definitely worth considering.