is missing? supported

[stanleyjwpp]

Hi, I have a subscription that uses missing? to check if an attr is set.
This query works fine when directly executed by datascript, but re-posh does not respond reactively when the query output is changed.

(rp/reg-query-sub
 :mysub
 '[:find [?k ...]
   :in $ ?vf
   :where
   [?vf :some-attr ?k]
   [(missing? $ ?k :attr)]])