Foundation
Provides core utilities, internationalization, and OS independence
...This project, swift-corelibs-foundation, provides an implementation of the Foundation API for platforms where there is no Objective-C runtime. On macOS, iOS, and other Apple platforms, apps should use the Foundation that comes with the operating system. Our goal is for the API in this project to match the OS-provided Foundation and abstract away the exact underlying platform as much as possible. We believe that the Swift standard library should remain small and laser-focused on providing support for language primitives.