The Swift project has achieved a critical milestone of maturity of the core fundamentals, providing stability for users to invest in using Swift in earnest.  On Apple's platforms such as macOS and iOS, the arrival of ABI and module stability has enabled the creation of stable binary frameworks.  Further, the Swift Package Manager, which has integrated support both in Xcode and other IDEs, provides a cross-platform solution for building and distributing Swift libraries.  Put together, these form ...