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all other methods support it and it's right
>>> barr = bytearray(b'abcd*')
>>> barr.center(len(barr) * 4, barr[-1:])
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
TypeError: must be a byte string of length 1, not bytearray
>>> b = b'abcd*'
>>> b.center(len(b) * 4, b[-1:])
b'*******abcd*********'
>>>