Also, since there's no real documentation yet, what's the difference between __nullable and nullable and __nonnull and nonnull?
It's documented here:
under the heading "Objective-C Language Enhancements". Basically you can leave out the double-underscore when it's a property attribute AND when it immediately follows a left parenthesis that encloses a type (so method return values, and method property types). This is not precisely how the above document expresses it. I remember reading about the statement in terms of parentheses, but I don't recall where that was, some other release notes perhaps, or perhaps a dev forums post.
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