public interface ICountingService
    {
        public int Increment(int? number);
    }

    public interface IAsyncCountingService
    {
        public Task<int> IncrementAsync(int? number, CancellationToken cancellationToken);
    }

[Test]
public async Task AsyncInvokeWithNullableParamsOnAsyncService()
{
    var serviceFactory = new ServiceFactoryBuilder()
        .WithConventionVerificationDisabled()
        .WithService<ICountingService, IAsyncCountingService>(() => new AsyncCountingService())
        .Build();

    var sut = new ServiceInvoker(serviceFactory);
    var request = new RequestMessage()
    {
        ServiceName = nameof(ICountingService),
        MethodName = nameof(ICountingService.Increment),
        Params = new object[] { null! },
    };

    var response = await sut.InvokeAsync(request);
    response.Result.Should().Be(1);
}