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This report focuses on , a feature introduced in Swift 5 to handle "non-frozen" enumerations—enums where new cases might be added in the future without breaking existing code. Core Functionality
: It cannot be merged with other cases (e.g., you cannot write case .first, @unknown default: ). Comparison: default vs @unknown default default @unknown default Catch-all Future-proofing Warning if known cases missing Yes Behavior on new cases Triggers warning to update code Common Issues What's the deal with "@unknown default" - Swift Forums
: If your code is recompiled and there are known enum cases that you haven't explicitly handled, the compiler will issue a warning . A standard default would stay silent. Usage and Rules
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