[fogus]

One philosophy of Clojure is to facilitate building practical and robust systems. In practice, people do runtime checking of maps using punning, some kind of `nil` check, or a more ponderous `(get m k sentinel)` checking pattern. The new feature obviates the latter as destructuring syntax in the vast majority of cases where the absence of the key throws. It's opt-in, so if Malli/Spec work then you don't need to use this. I will say that we have some other things brewing that compose well with `:keys!` and friends and the 1.13 release is going to DRY a lot of existing and future Clojure code.