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• Conditional conformance: https://swift.org/blog/conditional-conformance/
• Generics manifesto: https://github.com/apple/swift/blob/master/docs/GenericsManifesto.md
• SE-143: https://github.com/apple/swift-evolution/blob/master/proposals/0143-conditional-conformances.md
• All 4.1 proposals: https://apple.github.io/swift-evolution/#?version=4.1
• 4.1 code size optimizations: https://swift.org/blog/osize/
• Swift 4.1 release process: https://swift.org/blog/swift-4-1-release-process/
• Xcode 9.3 beta 4 release notes with a more comprehensive list of what's included in Swift 4.1: https://download.developer.apple.com/Developer_Tools/Xcode_9.3_beta_4/Release_Notes_for_Xcode_9.3_beta_4.pdf

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