the optimisticUpdate.run function expects a `void`, `Action`, or `Observable<Action>` return. Clarity matters. So by using `mapTo` operator the example shows the return of an action ISSUES CLOSED: #3702
the optimisticUpdate.run function expects a `void`, `Action`, or `Observable<Action>` return. Clarity matters. So by using `mapTo` operator the example shows the return of an action ISSUES CLOSED: #3702