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Cameron Simpson wrote:
A shallow catch would effectively need to mean "the exceptions uppermost traceback frame referers to one of the program lines in the try/except suite". Which would work well for lists and other builtin types. And might be insufficient for a duck-type with python-coded dunder methods.
I think it would be a very bad idea to have a language construct that only works for built-in types. It would be far too unpredictable and fragile.