@Override
  public boolean equals(Object o) {
    if (this == o) {
      return true;
    }
    if (!(o instanceof MusicPlaylistItem)) {
      return false;
    }
    MusicPlaylistItem that = (MusicPlaylistItem) o;
    return Objects.equals(track, that.track)
        && Objects.equals(playlistId, that.playlistId)
        && order == that.order;
  }
The index of track inside the playlist. Best efforts to make sure the correct order of playlist
items. Optional. Any int is valid - these numbers are meant purely to be relative to other
MusicPlaylistItem {@code order} values
portability-types-common/src/main/java/org/datatransferproject/types/common/models/music/MusicPlaylistItem.java