refit does not handle JSON return types with variable members about refit HOT 3 CLOSED

[Test]
public void GetExchangeRates()
{
    var fixture = RestService.For<IOpenExchangeRatesApi>("http://openexchangerates.org");
    var result = fixture.Latest();

    result.Wait();

    Assert.IsNotEmpty(result.Result.Rates);
}

public interface IOpenExchangeRatesApi
{
    [Get("/api/latest.json?app_id=key")]
    Task<ExchangeRates> Latest();
}

public class ExchangeRates
{
    public string Disclaimer { get; set; }
    public string License { get; set; }
    public string Base { get; set; }
    public IDictionary<string, decimal> Rates { get; set; }
}