It seems that protocol fns don't participate in s/fdef specfications. It 
would be nice they were. Sample:

    (ns sample
      (:require [clojure.spec :as s]))
    
    (s/instrument-all)
    
    ;; Spec a fn
    
    (s/fdef f
      :args (s/cat :i integer?)
      :ret integer?)
    
    (defn f [i] i)
    
    (f "1") ; will fail
    
    ;; Spec a fn of a protocol
    
    (defprotocol P
      (g [p i]))
    
    (s/fdef g
      :args (s/cat :p (partial satisfies? P)
                   :i integer?)
      :ret integer?)
    
    (defrecord R []
      P
      (g [_ i] i))
    
    (g (->R) "2") ; will pass

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