SUPRESS THE SUBORDINATE TRACK DATA!

object ObservableTrackData extends AnyRef with Memoization {

    val fromTrackData = memoize[TrackData, ObservableTrackData] {
                                    case normal: TrackData => new ObservableTrackData(normal)
                                    case impl: ObservableTrackData => impl
                                }

    def apply(subordinate: TrackData): ObservableTrackData = {
        val impl = fromTrackData(subordinate)
        impl.bind(subordinate)
        impl
    }
}