Function args with map :as destructuring doesn't support MapEntry args

## Actual
```clojure
user=> (defn x [& {:as opts}] (println opts))
#'user/x
user=> (x :x :y [:foo :bar])
invalid map. must have even number of inputs
```

## Expected
```clojure
user=> (defn x [& {:as opts}] (println opts))
#'user/x
user=> (x :x :y [:foo :bar])
{:x :y, :foo :bar}
nil
```