It would be nice if there was an IntEnum [1] that was taken is an input to `np.asarrayish` and `np.isarrayish` to require a combination of the groups of attributes/methods/semantics.
Don’t you mean IntFlag <https://docs.python.org/3/library/enum.html#intflag>? I like Marten’s idea of “grouping together” related functionality via ABCs and implementing different parts via ABCs (for example, in pydata/sparse we use NDArrayOperatorsMixin for exactly this), but I believe that separate ABCs should be provided for different parts of the interface. Then we can either: 1. Check with isinstance for the ABCs, or 2. Check with hasattr. I like the IntFlag idea most (it seems to be designed for use-cases like these), but a string-based (np.aspyarray(x, functionality=‘arithmetic|reductions')) or list-based (np.aspyarray(x, functionality=[‘arithmetic’, ‘reductions’]) is also fine. It might help to have some sort of a “dry-run” interface that (given a run of code) figures out which parts you need.
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