With Swift 5, the language becomes binary compatible. The new version is included in iOS 12.2, tvOS 12.2, watchOS 5.2 and macOS 10.14.4, all of which are currently in developer beta. This means that, when the new versions of Apple’s operating systems become available to the general public, apps published to the App Store which use Swift 5 are going to be significantly smaller for users running t..
