> (clojure.set/rename-keys {1 :a 2 :b 3 :c} {1 2 2 3 3 4})
>
> returns
>
> {4 :a}
That's caused by the collision between new and existing keys. Renaming
1 to 2 blows [2 :b]: {2 :a, 3 :c}; then renaming 2 to 3 blows [3 :c],
leaving {3 :a}; and the last just renames 3 to 4: {4 :a}.
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