In case someone faces the same issue I had about strict coercion, switching to spec did the trick.

not what I was looking after, but it works

@ikitommi How are you suppose to use s/or or s/coll-of with spec-tools/compojure-api? For example, I have a route that I want to return (s/or :b ::bar :f ::foo). Using s/or doesn't seem to work with compojure-api though, only one is allowed. e.g. https://gist.github.com/bmabey/ea68b00e48f914ad3a0d4aa31c01e196