Store generic Func T inside a colletion [Answered]

    protected void Register<Packet>(Func<Context, Packet, Task<bool>> task) where Packet : IPacket
    {
        _funcTasks.Add(typeof(Packet), task);
    }

private Dictionary<Type, Func<Context, IPacket, Task<bool>>> _funcTasks = new ();

_funcTasks.Add(typeof(Packet), Unsafe.As<Func<Context,IPacket,Task<bool>>>(task));

class P1 : IPacket {}
class P2 : IPacket {}

var dictionary = new  Dictionary<Type, Func<Context, IPacket, Task<bool>>>();
var func = (P2 p2) => { ... /* Something that only P2 can do */ };
dictionary.Add(typeof(P2), func); // Assume this worked.
dictionary[typeof(P2)](null, new P1()); // Well, the dictionary has `Func<Context, IPacket, Task<bool>>`s, so this should be fine, right?

_funcTasks.Add(typeof(Packet), (context, pkt, t) => task(context, pkt as Packet, t));

public MyPacketHandler : BasePacketHandler<Context>
{
    public MyPacketHandler()
    {
        Register<IHeartbeatC2SP>(HeartbeatC2SP_Handle);
    }

    private async Task<bool> HeartbeatC2SP_Handle(Context context, IHeartbeatC2SP)
    {
        // ...
    }
}

    protected void Register<Packet>(Func<Context, IPacket, Task<bool>> task) where Packet : IPacket
    {
        _funcTasks.Add(typeof(Packet), task);
    }

var handshake = (IHandshakeC2SP) packet;