Method lower

Lib/test/test_bytes.py:2757–2760

(b, a)

            assert not c or c[0] not in (0xdd, 0xcd)

        def lower(b, a):
            b.wait()
            c = a.lower()
            assert not c or c[0] not in (0xdd, 0xcd)

        def rjust(b, a):
            b.wait()