What is the obstacle of supporting virtual function import?

Hi all. Let me ask a very casual question.
Supporting the C++ virtual function import to Swift and make the C++ inheritance hierarchy to Swift seem to be the very important features to integrate the C++ code into Swift. However, I cannot find any progress for this for a long time, while it had been sometimes discussed before. Does anyone know what is the obstacle of these improvements?

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Hi @himeshi, now that Swift 5.9 is wrapped up, we will have more bandwidth to work on virtual function support. I have talked with @plotfi about the specific plan we are going to use for virtual function support last week and it's likely that @plotfi will work on it sometime in the near future.