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Isn't the proposed workaround also relying on CPython reference counting to immediately deallocate the sliced view? It fails if I keep a reference to the sliced view:
 byteslike = bytearray(b'abc')
 with memoryview(byteslike) as m1:
 m2 = m1[1:]
 bs = bytes(m2)
 
 >>> byteslike += b'd'
 Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 BufferError: Existing exports of data: object cannot be re-sized
It seems to me that it should be written as follows:
 with memoryview(byteslike) as m1:
 with m1[1:] as m2:
 bs = bytes(m2)
 >>> byteslike += b'd'
 >>> byteslike
 bytearray(b'abcd')
The memoryview constructor could take start, stop, and step keyword-only arguments to avoid having to immediately slice a new view.