I suspect your tangent is because you don't fully understand how composition works. Basically, it's weaker than you think I believe. I tried to write an exampl

I suspect your tangent is because you don't fully understand how composition works. Basically, it's weaker than you think I believe. I tried to write an example that demonstrates why I don't think the ambiguity you're referring to is possible. https://play.golang.org/p/TyMJbOjDdZ https://play.golang.org/p/TyMJbOjDdZ