Known direct subclasses
NavDisplay.PopTransitionKey

The key for NavEntry.metadata or Scene.metadata to notify the NavDisplay of how the content should be animated when popping from backstack.
NavDisplay.PredictivePopTransitionKey

The key for NavEntry.metadata or Scene.metadata to notify the NavDisplay of how the content should be animated when popping from backstack using a Predictive back gesture.
NavDisplay.TransitionKey

The key for NavEntry.metadata or Scene.metadata to notify the NavDisplay of how the content should be animated when adding to the backstack.

The base Key to be associated with value of type T.

The metadata DSL only accepts metadata keys that implements this interface