I'm currently working on integrating SourceKit with a macOS application. AppKit APIs (e.g. NSAttributedString, NSLayoutManager, etc) deal in terms of NSRange (UTF-16 code units?). SourceKit, however, deals in terms of integer offsets and lengths (UTF-8 code units?). Is there a more efficient or easier way to convert back and forth between the two other than doing the index(_:offsetBy:) -> samePosition(in:) dance?
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