[@(5) times: ^{}]

Is this a welcome addition, or just more noise / feature bloat.

Instead of
```objc
for ( NSInteger idx = 0 ; idx < someObjects.count ; ++idx ) {
}
```

How about:

```objc
[@(someObjects.count) bk_times:^{
}];
```

A version that includes the `idx` variable would be handy, I think, but I didn't know what to call it.  And if extensions to `NSNumber` aren't welcome, then I won't waste my time writing them! 😄