51: Swift 4.1 w/ Doug & Ben (part 2)

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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