Thanks!
If anyone's curious, I'm currently working on specing the cljfx descriptions:
(s/explain
:cljfx/desc
{:fx/type :stage
:showing true
:scene {:fx/type :label
:text "foo"}})
=> {:fx/type :label, :text "foo"} - failed: (desc-of (quote javafx.scene.Scene)) <-- expected {:fx/type :scene}!nice!