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May I know the rationale behind postwalk-replace/prewalk-replace to accept a map for replacing forms instead of functions? Functions provide ability to have some logic which is not possible via smap

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Seems to me like "postwalk-replace that accepts a function instead of a map" is just postwalk. Because all that postwalk-replace does is to call postwalk with (fn [x] (if (contains? smap x) (smap x) x)).
Or am I missing something?

You are correct.
never realized that :facepalm: