Fix casting error when using a child class of LavaTrack

src/Node/LavaNode.cs

@@ -402,7 +402,7 @@ await OnUpdateReceived.Invoke(new UpdateEventArg<TLavaPlayer, TLavaTrack> {
 
                         var lavaTrack = default(TLavaTrack);
                         if (root.TryGetProperty("track", out var trackElement)) {
-                            lavaTrack = (TLavaTrack)TrackDecoder.Decode($"{trackElement}");
+                            lavaTrack = TrackDecoder.Decode($"{trackElement}", player.Track);
                         }
 
                         var type = $"{root.GetProperty("type")}";
@@ -534,4 +534,4 @@ private Task OnVoiceServerUpdatedAsync(SocketVoiceServer voiceServer) {
             });
         }
     }
-}
+}

src/Player/Decoder/TrackDecoder.cs

@@ -16,10 +16,11 @@ public readonly struct TrackDecoder {
         ///     Decodes the hash for the specified track.
         /// </summary>
         /// <param name="trackHash">Track's hash.</param>
+        /// <param name="track">LavaTrack</param>
         /// <returns>
         ///     <see cref="LavaTrack" />
         /// </returns>
-        public static LavaTrack Decode(string trackHash) {
+        public static TLavaTrack Decode<TLavaTrack>(string trackHash, TLavaTrack track) where TLavaTrack : LavaTrack {
             Span<byte> hashBuffer = stackalloc byte[trackHash.Length];
             Encoding.ASCII.GetBytes(trackHash, hashBuffer);
             Base64.DecodeFromUtf8InPlace(hashBuffer, out var bytesWritten);
@@ -33,8 +34,8 @@ public static LavaTrack Decode(string trackHash) {
                 ? javaReader.Read<sbyte>()
                 : 1;
 
-            var track = new LavaTrack(
-                trackHash,
+            return LavaTrack.Initialize(track,
+                hash: trackHash,
                 title: javaReader.ReadString(),
                 author: javaReader.ReadString(),
                 duration: javaReader.Read<long>(),
@@ -46,8 +47,6 @@ public static LavaTrack Decode(string trackHash) {
                 position: default,
                 canSeek: true,
                 source: default);
-
-            return track;
         }
 
         /// <summary>
@@ -116,4 +115,4 @@ public static Task<IEnumerable<LavaTrack>> DecodeAsync(NodeConfiguration nodeCon
                 VictoriaExtensions.LavaTrackConverter);
         }
     }
-}
+}

src/Player/LavaTrack.cs

@@ -118,6 +118,32 @@
             Source = lavaTrack.Source;
         }
 
+        internal static TLavaTrack Initialize<TLavaTrack>(TLavaTrack? lavaTrack,
+            string hash, string id, string title, string author,
+            string url, TimeSpan position, long duration,
+            bool canSeek, bool isStream, string source) where TLavaTrack : LavaTrack
+        {
+            if (lavaTrack is null)
+                return (TLavaTrack)Activator.CreateInstance(
+                    typeof(TLavaTrack),
+                    new LavaTrack(hash, id, title, author, url, position, duration, canSeek, isStream, source));
+
+            lavaTrack.Hash = hash ?? throw new ArgumentNullException(nameof(hash));
+            lavaTrack.Id = id ?? throw new ArgumentNullException(nameof(id));
+            lavaTrack.Title = title ?? throw new ArgumentNullException(nameof(title));
+            lavaTrack.Author = author ?? throw new ArgumentNullException(nameof(author));
+            lavaTrack.Url = url ?? throw new ArgumentNullException(nameof(url));
+            lavaTrack.Position = position;
+            lavaTrack.Duration = duration < TimeSpan.MaxValue.Ticks
+                ? TimeSpan.FromMilliseconds(duration)
+                : TimeSpan.MaxValue;
+            lavaTrack.CanSeek = canSeek;
+            lavaTrack.IsStream = isStream;
+            lavaTrack.Source = source;
+
+            return lavaTrack;
+        }
+
         /// <summary>
         /// 
         /// </summary>
@@ -133,4 +159,4 @@
             return $"{Author} {Title}";
         }
     }
-}
+}