Swift 6 Strict Concurrency: Enabling Strict Mode in a Small App Without Downtime
Background Swift 6 introduces a language mode that enforces strict data‑race safety by default. When a target is compiled with swiftLanguageMode = v6 , many diagnostics that were merely warnings in Swift 5.9 become build‑time errors. For a small Swift application that must remain available, the question is how to activate this mode incrementally without trig