Tim Peters <tim.pet...@gmail.com> added the comment: FWIW, I doubt there's a real issue here. Objects in Python consume a lot more than a byte or two of memory, so the index range of a Python list is generally a lot less than ssize_t allows for. In other words, quantify "large" in "large arrays". How large can a Python list actually be, relative to ssize_t? Similar reasoning accounts for why we never worry about overflow when mucking with refcounts: the size of a refcount member exceeds the maximum number of references that could exist.
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