Order by derived type

[icnocop]

Hi.

I'm able to filter an OData collection by a derived type by using the $filter=isOf('Namespace.DerivedType') query option and function for example, but I can't sort the collection by its type.

For example, trying to use [email protected] returns:
The query specified in the URI is not valid. Could not find a property named '@odata.type' on type 'Namespace.BaseType'.

I found a discussion from 2016 with an approach to solve the issue:
https://groups.google.com/g/odata-discussion/c/TIQEn2FDdNY

We would probably implement this by defining a type() function, and then allowing you to use that value in [an] ... $orderby clause.

Is this approach still the recommended approach, or are there any other recommendations?

I haven't found any complete examples using a custom sortable function.

Would I be able to define it once and reuse it for different entity collections?
Would it accept and return a collection?

I only found mentions of the syntax to use a function in the Azure Cognitive Search orderby query option:
https://docs.microsoft.com/en-us/azure/search/search-query-odata-orderby

The sort criteria can either be the path of a sortable field or a call to either the geo.distance or the search.score functions.

Thank you.