_prepare_index_for_memoryview(i, j, x=None)
The conversions are necessary since to (i) ensure the integer index arrays are in one of the accepted types, and (ii) to ensure the arrays are writable so that Cython memoryview support doesn't choke on them.
Re-formatted arrays (x is omitted, if input was None)
Convert index and data arrays to form suitable for passing to the Cython fancy getset routines.
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