Library evolution mode: which types need @frozen to keep ABI stability across framework updates
I'm maintaining a small Swift framework consumed by an application that must be updatable without recompiling or restarting dependent clients. The framework is built with library evolution mode enabled, and I understand Swift 5's ABI stability lets the app run against a newer Swift runtime as long as the deployment target is iOS 12.2 / macOS 10.14.4 or later
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