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> Then the view owns a reference to the bytes object. But that does not
> solve the problem that writable memoryviews based on a readonly object
> might be hanging around.
How about doing
 PyObject_GetBuffer(b, &buf, PyBUF_WRITABLE);
 view = PyMemoryView_FromBuffer(&buf);
 // readinto view
 PyBuffer_Release(&buf);
Would attempts to access a "leaked" reference to view now result in ValueError("operation forbidden on released memoryview object")? If so then I think this would be safe.