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I know (or at least I think I know) that “selection” is essentially one particular arrangedObject, but when I’m doing binding I’m always binding one object at a time. So how do I know when to use “selection” and when to use “arrangedObjects”?
Ah, I understand what I was doing wrong. The “one object at a time” came from not distinguishing between a table column and a text view. A table column uses arrangedObject, since it contains multiple objects, arranged, while a text view is a single object, so it uses selection.