How to set up the most basic decoder possible #2452

Could someone please provide the basics on how to make and use a simple decoder to marshal python objects to .NET? The documentation doesn't provide any working examples or detailed steps to set this up. So I tried just winging it by making a simple decoder:

using Python.Runtime;

namespace PythonNetCodecs;

public class Decoder : IPyObjectDecoder
{
   public bool CanDecode(PyType objectType, Type targetType)
   {
      Console.WriteLine("Inside CanDecode method");
      return false;
   }

   public bool TryDecode<T>(PyObject pyObj, out T? value)
   {
      Console.WriteLine("Inside TryDecode method");
      value = default;
      return false;
   }

   public void RegisterDecoder()
   {
      PyObjectConversions.RegisterDecoder(this);
   }
}

And then doing the following from my python code:

from PythonNetCodecs import Decoder

decoder = Decoder()
decoder.RegisterDecoder()

x = List[Object]()
y = None
decoder.TryDecode(x, y)

I get an error, which is not surprising because I basically have no idea what I'm doing:

InvalidOperationException: Late bound operations cannot be performed on types or methods for which ContainsGenericParameters is true.

Setting up a working codec has been my main obstacle to using pythonnet over the last couple of years so any help/pointers would be most welcome.