It seems we are adding to the wishlist! I see four so far: 1. Exposed in API, can be overridden with __array_ufunc__ 2. One that converts everything to ndarray (or subclass); essentially the current implementation; 3. One that does asduckarray 4. One that assumes all arguments are arrays. Maybe handiest would be if there is a method to coerce all relevant arguments with a function of one's choice? I.e., in the example of Stephan, one would have ``` if function in JUST_COERCE: coerced_args, coerced_kwargs = function.__coerce__(np.asanyarray, *args, **kwargs) return function.__implementation__(*coerced_args, **coerced_kwargs) ``` Actually, this might in fact work with the plan proposed here, if we allow for an extra, optional kwarg that contains the coercion function, that is ``` return function.__implementation__(*args, coercion_function=np.asanyarray, **kwargs) ``` The possible advantage of this over yet more dunder methods is that one can fine-tune the extent to which something has to mimic an array properly (e.g., run `asanyarray` only if `shape` is not present). It would be nice, though, if we could end up with also option 4 being available, if only because code that just can assume ndarray will be easiest to read. All the best, Marten