A related but slightly different issue: is prefer-method supposed to be
transitive?
That is, (prefer-method f a b) and (prefer-method f b c) implies
(prefer-method f a c)?
Here is a unit test that checks for transitivity (which fails in Clojure
1.8.0):
(test/deftest transitive
(derive ::transitive-d ::transitive-a)
(derive ::transitive-d ::transitive-c)
(defmulti transitive identity)
(defmethod transitive ::transitive-a [x] [::transitive-a x])
(defmethod transitive ::transitive-c [x] [::transitive-c x])
(prefer-method transitive ::transitive-a ::transitive-b)
(prefer-method transitive ::transitive-b ::transitive-c)
(test/is (= [::transitive-a ::transitive-d]
(transitive ::transitive-d))))
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