IOS automatic reference counting (ARC) backward compatibility?

ARC is (with some limitations) backward compatible to iOS 4. http://developer.apple.com/library/mac/#releasenotes/ObjectiveC/RN-TransitioningToARC/_index.html.

ARC works on any version of iOS 4, 5, and 6. On iOS 4, the limitation is no automatic zeroing of weak references.

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