I discussed prewalk and postwalk with a another Clojure user that I am
friends with. He sent me the following, via email, this morning:
I have a workaround/solution for you. I still don't know exactly
why, but the :else clause in walk calls outer on form. This will give
you all sorts of class cast exceptions if you only wanted to apply the
function to each element individually. With that said, just wrap your
function with another that ignores any sequential structures.
(defn ignore-sequential [f]
#(if (sequential? %) % (f %)))
user> (prewalk (ignore-sequential inc) [1 [2] 3])
[2 [3] 4]
user> (postwalk (ignore-sequential inc) [1 [2] 3])
[2 [3] 4]
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