Python 2/3 buffer protocol inconsistency

example.py

# Python 2
>>> b = bytearray(8)
>>> v = memoryview(b)
>>> v[0] = 42
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'int' does not have the buffer interface
>>> b
bytearray(b'\x00\x00\x00\x00\x00\x00\x00\x00')

# Python 3
>>> b = bytearray(8)
>>> v = memoryview(b)
>>> v[0] = 42
>>> b
bytearray(b'*\x00\x00\x00\x00\x00\x00\x00')