Clojurians Log v2

I use something like this

(def collection-transformer
  (mt/transformer
   {:decoders
    {:vector (fn [x]
               (if (vector? x) x [x]))
     :sequential (fn [x]
                   (if (sequential? x) x [x]))
     :set (fn [x]
            (if (set? x) x #{x}))}}))

and then if the schema is a collection but a parameter is not, it will be wrapped in the relevant collection

and include that as one of the transformers passed to the coercer

then ths spec is just

[:year {:optional true}
       [:vector int?]]

Yes, muuntaja has cheshire module so you'd just need to configure the middleware to refer to cheshire json format instead of the regular Jsonista json format