anchor.diff:        if (metas.image.package != null)
           params["song.imagePackage"] = metas.image.package;
       }
  +    if (metas.id != null) {
  +      params["song.trackID"] = metas.id;
  +    }
     }
   }
   
  
positive.code:   final MetasImage image;
  
    const Metas({
      this.title,
      this.artist,
      this.album,
  
negative.code: 
  @immutable
  class Metas {
    final String id;
    final String title;
    final String artist;
    final String album;
  