With regards to np.where -- shouldn't where be a ufunc, so subclasses or other
array-likes can be control its behavior with __numpy_ufunc__?
As for the other indexing functions, I don't have a strong opinion about how
they should handle subclasses. But it is certainly tricky to attempt to handle
handle arbitrary subclasses. I would agree that the least error prone thing to
do is usually to return base ndarrays. Better to force subclasses to override
methods explicitly.
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