I just released TinyPubSub.Forms 1.1 that takes advantage of the change I got into Xamarin.Forms Core Navigation.
Nuget package for Forms can be found at https://www.nuget.org/packages/tinypubsub.forms/.
The change is that we now can get info from the NavigationPage what pages that are popped when we call PopToRoot. We needed this information to deregister pages in TinyPubSub.
