Yes, all behaviors should be implemented like definitions in category theory: X behaves like a Y over the category of Zs, and you have to recursively unpack the definition of Y and Z through about 4-5 more layers before you have a concrete implementation.
I'll be honest here. I don't know if any comment on this thread is a joke.
There are valid reasons to want each one of the things described, and I really need to add type reflexivity to the set here. Looks like horizontal traits are a completely unsolved problem, because every type of program seems to favor a different implementation of it.
