[Numpy-discussion] new NEP: np.AbstractArray and np.asabstractarray

[Marten van Kerkwijk]

​I think we don't have to make it sounds like there are *that* many types
of compatibility: really there is just array organisation
(indexing/reshaping) and array arithmetic. These correspond roughly to
ShapedLikeNDArray in astropy and NDArrayOperatorMixin in numpy (missing so
far is concatenation). The advantage of the ABC classes is that they can
supply missing methods (say, size, isscalar, __len__, and ndim given shape;
__iter__ given __getitem__, ravel, squeeze, flatten given reshape; etc.).

-- Marten
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