> Oh by the way, I forgot to mention a subtle change.
> PyObject_GetBuffer(PyBUF_SIMPLE) is less strict that PyArg_Parse("y#") /
> "buffer" converter of Argument Clinic: getargs.c also checks that the
> buffer is contiguous, extract of getbuffer():

We already made such changes in the past. The difference is subtle and I have 
doubts that choosing any of ways was deliberate.