Swift 5.10 incorporates the remaining language proposals necessary for accomplishing full data isolation under strict concurrency checking. It does so conservatively, and the set of proposals under active development now in Swift evolution aim to lift some of the limitations for patterns that are diagnosed in Swift 5.10, but can be proven safe u...

Let's talk about data race safety in Swift 6! The Swift 6 language mode is opt-in; you can continue to use Swift 5 mode with the Swift 6 compiler. You can incrementally refine your code to take advantage of full data isolation at your own pace, module by module.