[Cython] Cython mishandles None in slices

[Bryan O'Sullivan]

Here are two lines of valid Python:

>>> 'abc'[None:2]
'ab'
>>> 'abc'[1:None]
'bc'

If I try this in code that I compile with Cython, it throws an exception:

TypeError: 'NoneType' object cannot be interpreted as an index
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