I'm guessing this is either impossible or I'm missing something obvious. 
Say I have this:

  (defprotocol X
    (foo [x] [x y]))

For the sake of implementation inheritance, I'd like to define one of the 
arities in map x1:

  (def x1 {:foo (fn [x] "x1")})

And the other arity in x2:

  (def x2 {:foo (fn [x y] "x2")})

Is there any way I can merge those two guys to extend them both to type T?

  (extend T
    X
    (merge-with ??? x1 x2))

Or something else?

Thanks,
Jim

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