Just in case someone stumbles over this post, I found a simple solution 
which works for me:

(do
  (require '[clojure.spec.alpha :as s])
  (import '(clojure.lang ISeq))
  (defprotocol Foo (foo [this]))
  (defrecord Bar [bar] Foo (foo [this] (.bar this)))
  (deftype   Baz [bar]
    Foo (foo [this] (.bar this))
    ISeq (seq [this] `(~(.bar this))))
  (s/def ::bar number?)
  [(s/valid? (s/keys :req-un [::bar]) (->Bar 0))
   (s/valid? (s/cat :bar ::bar) (->Baz 0))]) ;[true true]

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