What's the added benefit of retain/autoreleasing an already retained property?

It allows the result returned to persist for the entirety of the current call stack even if the owning object is deallocated in the interim. The custom in Cocoa is that anything that is returned by a getter without an owning reference (ie, any getter without 'new', 'alloc', 'retain' or 'create' in the name) will last for at least as long as the enclosing autorelease pool.

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