[Bug]: legacy-sub signal-fn is not backward compatible

[RolT]

What happened?

The signal fn in the :legacy-sub mode of the new alpha namespace receives the query map instead of the query vector. The computation-fn receives the query vector as expected.

cljs.user> 
(reg-sub :a 
   (fn [v] (println "Signal argument:" v) (atom nil)) 
   (fn [_ v] (println "Computation argument:" v)))
;; => #object [re_frame$subs$alpha$subs_handler_fn]
cljs.user> (subscribe [:a 1])
Signal argument: {:re-frame/q :a, :re-frame/lifecycle :default, :re-frame/query-v [:a 1]}
Computation argument: [:a 1]
;; => #object [reagent.ratom.Reaction {:val nil}]

Version

1.4.3

What runtimes are you seeing the problem on?

Google Chrome

Relevant console output