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https://developer.apple.com/library/prerelease/ios/releasenotes/DeveloperTools/RN-Xcode/Chapters/xc7_release_notes.html#//apple_ref/doc/uid/TP40001051-CH5-SW1
"For consistency and better composition of generic code, ArraySlice indices are no longer always zero-based but map directly onto the indices of the collection they are slicing and maintain that mapping even after mutations."