My real wish for Pascal interfaces is that they are pure. Some of that is not bringing in COM stuff (including recounting) because I think memory management is or should be different to interface-based clean coding. Another: In Delphi if you define a property in an interface, you have to bring in the getter and setter too. And that makes them implicitly public / visible (even if the implementing class declares them as private.) And they must be methods, there’s no way to say “read, but I don’t care how” (where Delphi can normally read fields too.) In other words, the semantic of “I want a property with read access” causes the interface contract to define the implementation, including making public the normally private / internal backing.

Whereas what I really want is to declare “property Foo: Integer read;” and the interface requires that is satisfied, but not how. In other words, interfaces are pure - they don’t bring in extra baggage. You can do that in Oxygene.