71: Key Path Expressions as Functions

• Key Path Expressions as Functions: https://forums.swift.org/t/key-path-expressions-as-functions/19587
• Implementation: https://github.com/apple/swift/pull/19448
• Previous discussion threads:
  • https://forums.swift.org/t/allow-key-path-literal-syntax-in-expressions-expecting-function-type/16453
  • https://forums.swift.org/t/key-path-getter-promotion/11185
  • https://forums.swift.org/t/pitch-keypath-based-map-flatmap-filter/6266
• Original "Smart Key Path" proposal: https://github.com/apple/swift-evolution/blob/master/proposals/0161-key-paths.md
• Kuery: https://github.com/kishikawakatsumi/Kuery

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