 Operation Descriptor  The example above showed that configuring the operations is optional. If you want to have access to the actual field input types or allow only a subset of comparable filters for a given property, you can configure the operation over the `IFilterInputTypeDescriptor<User>`  ```csharp public class UserFilterType : FilterInputType<User> {     protected override void Configure(         IFilterInputTypeDescriptor<User> descriptor)     {         descriptor.BindFieldsExplicitly();         descriptor.Object(x => x.Address)