On May 11, 2010, at 10:17 AM, Keary Suska wrote:

> There have been some lengthy discussions about this. An object may choose to 
> emit KVO notifications for its collection properties (but this behavior 
> should never be expected unless it is specifically documented), but no 
> collection will ever emit a KVO notification that its contents have changed 
> (unless, of course, you subclass and add this behavior).

Depends on whether you consider a dictionary a collection or not.  
NSMutableDictionary does emit KVO notifications when its contents change.

I suspect you were thinking of sets and arrays, in which case you're correct.

Cheers,
Ken

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