kotlin sorting

fun sortBySubtitle(list: List<MediaBrowserCompat.MediaItem>) : List<MediaBrowserCompat.MediaItem> {

    return list.sortedWith(compareByDescending <MediaBrowserCompat.MediaItem>
    { it.description.subtitle.toString() }
            .thenBy (String.CASE_INSENSITIVE_ORDER) { it.description.title.toString() })

}