> On Sep 22, 2016, at 6:07 PM, Quincey Morris 
> <quinceymor...@rivergatesoftware.com> wrote:
> But that’s because the KVO notification mechanism is a more ancient design 
> concept, where it likely seemed simple, adequate and flexible. I assume it 
> comes from NeXTStep days (late 80s or early 90s), not OS X 10.0 days (early 
> 2000s), although I don’t know for sure.

Actually nope, it showed up in 10.3, making it younger than the target/selector 



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