Which does the exact kind of shallow equality checks I was just describing :) The point is that for shallow equality checks to work properly, you do have to ha

Which does the exact kind of shallow equality checks I was just describing :) The point is that for shallow equality checks to work properly, you do have to handle data immutably - such as using `someArray.concat(item)` instead of `someArray.push(item)`, because otherwise passing in the same references is interpreted as "nothing as changed".