iOS devs can finally claim functionality that our Java counterparts have
been taking for granted: "nullable" annotations in ObjC which transfer to
Optional Swift types <https://developer.apple.com/swift/blog/?id=25>!
I hope we can start using these in our app ASAP. It will help ObjC dev
efforts a ton while also easing our (not too distant) transition to Swift.
I *think* that all we need to do is specify Xcode 6.3 as the *minimum*
*supported* Xcode version. I'm guessing lesser versions will fail to
compile the code if they encounter one of these new pragmas or annotations.
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