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`RangeReplaceableCollection.rotated(by:)` attempt w/ modulus issue.
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| extension RangeReplaceableCollection where Index: BinaryInteger { | |
| func rotated(by offset: Index) -> SubSequence { | |
| guard !isEmpty else { return .init() } | |
| let shiftPoint = offset % endIndex | |
| return self[shiftPoint...] + self[..<shiftPoint] | |
| } | |
| } |
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