In the newest version of fast, fast 3, the naming convention of enumerations has changed.
The name displayed on the Apple website is the newest version, so the listings are in camelCase. On the other hand, you have not updated Xcode yet, so you will only see enumeration values in PascalCase, which for him is the old naming convention.
You do not need to worry about it. When you decide to upgrade to Swift 3, Xcode will be able to transfer all these things for you!
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