Closed as not planned
Description
The typing spec says
Any can also be used as a base class. This can be useful for avoiding type checker errors with classes that can duck type anywhere or are highly dynamic.
But this leaves some cases unclear. The unclear cases are described in https://discuss.python.org/t/take-2-rules-for-subclassing-any/47981
One possible solution was explored in #1672, but rejected due to issues uncovered in https://discuss.python.org/t/take-2-rules-for-subclassing-any/47981/19