Sorry, I answered too quickly:
The second one was wrong - this one ensures c and d are contained.
(defn foo [a b & {:keys [c d] :as m}]
{:pre [(every? (partial contains? m) [:c :d]]}
1)
And the last one was un-idiomatic - this one checks whether only c and d
are contained.
(defn foo [a b & {:keys [c d] :as m}]
{:pre [(empty? (dissoc m :c :d))]}
1)
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