`any` and `some` dualityThis maintains proposals for changes and user-visible enhancements to the Swift Programming Language. - swift-evolution/proposals/0244-opaque-result-types.md at b1caeccf5d273a1cc53b331d41ea169f7729...#dual#via-dalton-claybrook#generics#swift#swift-evolution·github.com·Jul 1, 2019`any` and `some` duality
