https://github.com/Pauan/nulan/blob/95a73a115fdef0cb27fae2e7...

See how easy that is? It took me maybe 5-10 minutes to add it in.

And it naturally supports recursion as deeply nested as you want:

  (def (dict "foo" (dict "bar" b) "qux" c)
       (dict "foo" (dict "bar" 1) "qux" 2))