Clojurians Log v2

Excuse the newbie question, I am reading through the quick start with Om.Next and I don’t understand why the read function (https://github.com/omcljs/om/wiki/Quick-Start-%28om.next%29#a-read-function) has :as env when env isn’t referenced anywhere else in the function

I think it gets used later on in the tutorial when the read becomes defmulti