public class NullableFloatToNullableDoubleConverter : ITypeConverter<float?, double?>
    {
        public double? Convert(float? source, double? destination, ResolutionContext context)
        {
            if (source == null)
            {
                return null;
            }

            var floatAsString = source.Value.ToString(CultureInfo.InvariantCulture);

            return double.Parse(floatAsString);
        }
    }