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Worth it for an object to caching its own IMPs?

I wrote:

> I've also considered creating a second representation of the tree 
> which is a simple flat NSDictionary, keyed by the actual keypath. So 
> instead of this:
>
> 	[myStructure valueForKeyPath:@"element1.element2.element3"];
>
> I do this:
>
> 	[myStructure objectForKey:@"element1.element2.element3"];
>
> Not sure offhand how much time this would save, but 30% less 
> dispatches has to be worth something.

Errr.... 60%+.

     - Scott

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