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or is it the "typeclass trick" using implicits
No, I don't see any relevance to typeclasses and implicits here
Monoid[T]
with anything that has a type parameter and explicit instances, and your question remains the same
Monoid[Int]
, you know that the Monoid is for Int
Model
State
, but you don't know which State
Model
without knowing its State
, you could do that with universal types too no?
_
you are using there doesn't mean what you think it means
def f[Model[_]] = ???
def f(model: Model[_]) = ???