Support nullable type and enum conversions on results. Fixed !!

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internal static class DocumentConverterExtensions
{
    private static void SetPropertyValue<T>(PropertyInfo property, T instance, string fieldValue)
        where T : IDocument
    {
        if (!property.CanWrite || property.Name == nameof(IDocument.UniqueKey)) return;

        var propertyType = GetUnderlyingType(property);

        if (propertyType.IsEnum)
        {
            property.SetValue(instance, Enum.ToObject(propertyType, long.Parse(fieldValue)));
        }
	else ....
   }

   ...
}

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    public static Type GetUnderlyingType(PropertyInfo propertyInfo)
    {
        // Get the underlying type, checking if it is a Nullable<T>
        var underlyingType = Nullable.GetUnderlyingType(propertyInfo.PropertyType);

        // Determine the actual type to check IsEnum on (either the underlying type or the original type)
        var typeToCheck = underlyingType ?? propertyInfo.PropertyType;
        return typeToCheck;
    }