bpo-9566: Fix size_t=>int downcast warnings #5230
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Use wider types (int => Py_ssize_t) to avoid integer overflows.
Use Py_ssize_t type rather than int, since gc_list_size() returns a Py_ssize_t. This change prevent any risk of integer overflow.
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Use wider types (int => Py_ssize_t) to avoid integer overflows.
https://bugs.python.org/issue9566