On 5 Apr 2014, at 12:40 am, Keary Suska <cocoa-...@esoteritech.com> wrote:

> I came across a situation of using undo with sets and it seemed like I needed 
> some extra tests to implement undo properly.


Maybe a set isn't the right model? Either an object is a member or it isn't - 
Undo should maintain that correctly on add/remove, but if you're having to do 
extra tests, then it sounds like you might want to look as a counted set 
(NSCountedSet) instead?

Note sure what Core Data does to complicate or simplify that...

--Graham



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