gh-125767: Fix pickling and copying of super objects #125781
Merged
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Previously, copying a super object returned a copy of the instance invoking super(). Pickling a super object could pickle the instance invoking super() or fail, depending on its type and protocol.
Now deep copying returns a new super object and pickling pickles the super object. Shallow copying returns the same super object.
📚 Documentation preview 📚: https://cpython-previews--125781.org.readthedocs.build/