astropy__astropy-13977

Should `Quantity.__array_ufunc__()` return `NotImplemented` instead of raising `ValueError` if the inputs are incompatible?

Verdict: the issue points to the file or function that was changed (Tier B).

So, basically it could be as simple as something equivalent to `if not all(isinstance(io, (Quantity, ndarray, Column) for io in *(inputs+out)): return NotImplemented` -- though done in a way that does not slow down the common case where inputs are OK -- say with a `try/except`.

The two checks disagreed (stated fix vs. points to it); the lower reading shown: “So, basically it could be as simple as something equivalent to `if not all(isinstance(io, (Quantity, ndarray, Column) for io in *(inputs+out)): retur…”

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