Subscriber-Only: Today's episode is available only to subscribers. If you are a Point-Free subscriber you can access your private podcast feed by visiting https://www.pointfree.co/account.---Let's insert a new feature into the navigation stack. We'll take things step-by-step, employing an enum to hold multiple features in a single package, and making small changes to how we use our existing APIs before sketching out all-new tools dedicated to stack navigation.