Faster NSArray Iteration

This sounds encouraging. There are a number of places where I currently use -getObjects when I want to fly through an array. It would be great if this could be automated.

I'm not totally sold on the idea of not using -objectAtIndex, though. Although it's inconvenient when cast in a certain light, it also leaves no ambiguity that you're dealing with an NSArray and not some random block of memory.

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