Is this expected behavior and if so, can someone point out what I'm misunderstanding? Explicitly stating to use the default schemas registry causes an error (and actually every merge I've done so far does):

(m/validate
  [:map
   [:x string?]]
  {:a 1})  ;; => false

(m/validate
  [:map {:registry (merge (m/default-schemas))}
   [:x string?]]
  {:a 1})  ;; => clojure.lang.ExceptionInfo: :malli.core/child-error {:type :enum, :properties nil, :children nil, :min 1, :max nil}
                 {:type :malli.core/child-error, :message :malli.core/child-error, :data {:type :enum, :properties nil, :children nil, :min 1, :max nil}}

I'm looking to express something like an :or schema, but instead of enumerating the arguments by hand I'd like to supply a collection of schemas. So something like:

[:any-of schemas-coll]

[:or schema-1 schema-2 ... schema-n]

no idiom, children are currently varargs, not a single collection. But:

(into [:or] [:int :string])
; => [:or :int :string]

also, there is the map ast:

(m/ast [:or :int :string])
; => {:type :or, :children [{:type :int} {:type :string}]}

(update *1 :children conj {:type :boolean})
; => {:type :or, :children [{:type :int} {:type :string} {:type :boolean}]}

(m/from-ast *1)
; => [:or :int :string :boolean]

Thanks!