Clojurians Log v2

Can I combine a custom schema registry with functions schemas ? This does not work:

{:malli/schema
   [:function
    {:registry malli/malli-registry}
    [:=>
     [:cat
      [:sequential [:or vector? fn?]]
      [:sequential [:map {:closed true}
                    [:split-uid {:optional true} string?]
                    [:train [:fn dataset?]]
                    [:test  {:optional true} [:fn dataset?]]]]
      fn?
      [:enum :accuracy :loss]]

     :scicloj.metamorph.ml/optimize-hyperparas--evaluation-result]

where

malli/malli-registry

is a custom 'compound registry