AOT safe msgpack serialization with List<T>

Program.cs

using Nerdbank.MessagePack; // Comes from the Nerdbank.MessagePack nuget package
using PolyType;

namespace MessagePackBug;

[GenerateShape]
public partial record ItemsRequest(
	[property:Key(0)]
	string Prop1,

	[property:Key(1)]
	string Prop2,

	[property:Key(2)]
	List<Item> Items);

public record Item(
	[property: Key(0)] string Prop1,
	[property: Key(1)] string Prop2
);

class Program
{
	static readonly MessagePackSerializer Serializer = new();

	static void Main()
	{
		var req = new ItemsRequest(
			"prop1",
			"prop2",
			[
				new Item("1", "2"),
				new Item("3", "4")
			]);

		var result = Serializer.Serialize(req);
		Console.WriteLine(Convert.ToHexString(result));
	}
}

@AlphaBs @puli1027 @Zdendaki filed or +1'd an issue on MessagePack-CSharp about a month ago asking why List<T> breaks AOT in that library.

I tried the same repro, just slightly changed to use Nerdbank.MessagePack instead, and it worked in AOT perfectly:

> bin\AotNativeConsole\Release\net9.0\win-arm64\publish\AotNativeConsole.exe
93A570726F7031A570726F70329292A131A13292A133A134

thank you. it works