HandleByteOrNullResult
Handles a Route.Result.Data matching a Byte or null Requires that the Route.Result.Data.bundle is described by a SingleValueNavigationSpec matching NavigationBundleSpecType.ByteType either directly or wrapped by NavigationBundleSpecType.OptionalType
Parameters
retain
If true the result will be retained in the NavBackStackEntry. It will be deleted otherwise.
onResult
Method for handling the received Byte