How to avoid Swift 6 concurrency crashes

Issue #1037 &#xA; Enabling Swift 6 strict concurrency checking ( SWIFT_STRICT_CONCURRENCY = complete ) catches data races at compile time, but it does not protect you fully at runtime. The compiler also injects dynamic isolation assertions at actor and GCD boundaries. These fire in production, not just in your test suite, often at callsites that produced no compiler warning at all. &#xA; The two…