Clojurians Log v2

I’m trying to use union queries for routing, but in the most simple case, e.g., as presented here: https://github.com/anmonteiro/anmonteiro.github.io/blob/master/assets/cljs/om_next_routing/union.cljs, I’m seeing the error: "Union components must implement Ident”. I’m using normalized data and stuffing the union under the route/data key. Could someone point me in the right direction?