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Just prepend the empty bytestring if you want to make sure the result is a bytes object:
>>> b'' + memoryview(b'foo') + b'bar'
b'foobar'
I think the following limitation may be more annoying, though:
>>> b''.join([memoryview(b'foo'), b'bar'])
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
TypeError: sequence item 0: expected bytes, memoryview found