[Numpy-discussion] change to memmap subclass propagation

[Allan Haldane]

Hi all,

This is a warning for a planned change to np.memmap in
https://github.com/numpy/numpy/pull/7406.

The return values of ufuncs and fancy slices of a memmap will now be
plain ndarrays, since those return values don't point to mem-mapped memory.

There is a possibility that if you are subclassing memmap using multiple
inheritance something may break. We don't think anyone will be affected,
but please reply if it does affect you.

Allan