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In my experience, I tend to only use memoryview() for "bytes-like" buffers (but see Issue 23756 about clarifying what this means). Example from /Lib/_compression.py:67:
def readinto(self, b):
 with memoryview(b) as view, view.cast("B") as byte_view:
 data = self.read(len(byte_view))
 byte_view[:len(data)] = data
 return len(data)
Fixing cast("B") or adding a memoryview(raw=True) mode could probably help when all you want is a byte buffer.