public async void SerializeAsync(Stream stream)
{
var length = (uint)data.Count + packetId.SizeofBytes();
using (var bw = new NetworkWrite(stream, Encoding.UTF8, true))
{
bw.WriteVarInt(length);
bw.WriteVarInt(packetId);
bw.Flush();
}
await stream.WriteAsync(data.Array, data.Offset, data.Count);
}