Method sizeof

Lib/test/test_free_threading/test_io.py:94–96

(barrier, b, *ignore)

            b.__setstate__(st)

        def sizeof(barrier, b, *ignore):
            barrier.wait()
            getsizeof(b)

        self.check([write] * 10, self.ioclass())
        self.check([writelines] * 10, self.ioclass())