Lookup refs using an input

Hi, I'm trying to do a query using lookup refs, using an input variable in the lookup ref, like this:

(d/q '[:find ?e
       :in $ ?client-squuid
       :where [?e :appointment/client [:thing/squuid ?client-squuid]]]
     (d/db conn)
     #uuid "5664cb92-8256-49f9-a7ff-30d3d00939c4")

When I do the above, I get:

#object[Error Error: Cannot compare 5664cb78-8010-4d4e-bfdf-b1b6416396d2 to ?client-squuid]
     cljs.core.UUID.cljs$core$IComparable$_compare$arity$2 (jar:file:/Users/alistair/.m2/repository/com/cognitect/transit-cljs/0.8.225/transit-cljs-0.8.225.jar!/cognitect/transit.cljs:42:14)
     cljs.core/-compare (jar:file:/Users/alistair/.m2/repository/org/clojure/clojurescript/1.7.170/clojurescript-1.7.170.jar!/cljs/core.cljs:701:22)
     cljs.core/compare (jar:file:/Users/alistair/.m2/repository/org/clojure/clojurescript/1.7.170/clojurescript-1.7.170.jar!/cljs/core.cljs:2080:5)
     datascript.db/cmp-val (jar:file:/Users/alistair/.m2/repository/datascript/datascript/0.13.3/datascript-0.13.3.jar!/datascript/db.cljc:285:6)
     datascript$db$cmp_datoms_avet (jar:file:/Users/alistair/.m2/repository/datascript/datascript/0.13.3/datascript-0.13.3.jar!/datascript/db.cljc:308:6)

even though this:

(d/q '[:find ?e
       :where [?e :appointment/client [:thing/squuid #uuid "5664cb92-8256-49f9-a7ff-30d3d00939c4"]]]
     (d/db conn))

works fine.

Is this expected behaviour?

Cheers!

Reproduce the two d/q forms with the shown UUID input, then inspect datascript/db.cljc at cmp-val and cmp_datoms_avet named in the stack trace. Done means determining whether lookup refs with an input are supported and correcting the behavior or documenting the result.