One's a dictionary (unordered, simple unique keys), and one's a list (ordered, arbitrary contents, no uniqueness constraints). Schemas may enforce more, but those are the intrinsic qualities.
I agree that use varies widely, but the difference is fairly clear. The existence of nonsense doesn't mean one can't make good decisions.
I agree that use varies widely, but the difference is fairly clear. The existence of nonsense doesn't mean one can't make good decisions.