Is there something in the setting described not resolved by (the dictionary-passing implementation of) typeclasses? The modeling problem described seems more like the problem of modeling "top levels" in general than generic functions in particular.
Quite possibly! I need to go and re-learn Haskell's typeclasses - I found them quite elegant when I looked at them years ago, but have forgotten it all since :-( Ah, the penalties of age...
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