On 14 Jan 2014, at 4:16 am, Jordan Rose <[email protected]> wrote:
> Is this even meaningful? Should we at least warn on a void property?

I’ve used it (sparingly) as a cheeky way to document a keypath that provides 
“edge trigger” notifications via KVO.
It’s pretty hard to do by accident now, with ivar auto-synthesis complaining 
pretty quickly.

-Scott
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