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The flags from mb_getbuf() have to be passed to PyBuffer_FillInfo():
 return PyBuffer_FillInfo(view, (PyObject *)self,
 internal, 5,
 /*readonly=*/0, flags);
The flags contain the actual request that the consumer
sends to the buffer provider, so they cannot be hardcoded.
In this example, memoryview sends the PyBUF_FULL request to
mb_getbuf(). If the request is successful, it can assume
non-NULL strides.
Should the documentation be improved?