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* Add _PyWeakref_IS_DEAD() internal function. * Modify is_dead_weakref() of Modules/_weakref.c and _pysqlite_drop_unused_cursor_references() to replace PyWeakref_GET_OBJECT() with _PyWeakref_IS_DEAD(). * Replace "int i" with "Py_ssize_t i" to iterate on cursors in _pysqlite_drop_unused_cursor_references().