func TestTypeUpgrade(t *testing.T) {
	t.Parallel()

	x := &proto2.UploadFileRequest{
		Type: &proto2.UploadFileRequest_ChunkPiece{
			ChunkPiece: &proto.ChunkPiece{
				Data:         []byte("Hello World!"),
				FullDataHash: []byte("Foobar"),
				PieceIndex:   42,
			},
		},
	}

	data, err := protobuf.Marshal(x)
	require.NoError(t, err)

	// Exactly the same output
	// EhgKDEhlbGxvIFdvcmxkIRIGRm9vYmFyGCo= on `main`
	// EhgKDEhlbGxvIFdvcmxkIRIGRm9vYmFyGCo= on this branch
	fmt.Println(base64.StdEncoding.EncodeToString(data))
}