title: Is objectAtIndexedSubscript available in IOS5?
body: <p>The documentation says it's available in MacOS 1.08.</p>
  
  <p>So what's the story? What about for iOS5?</p>
  
  <p>It's a very important selector because self[5] will actually turn into [self objectAtIndexedSubscript:5] unless I am missing something.</p>
  
  <p>Doesn't work in NSOrderedSet but works in NSArray.</p>
  
  <p>What am I missing?</p>