feat: add immutability assertions and filters for types#334
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Implements #329: IsImmutable / IsNotImmutable for single types, AreImmutable / AreNotImmutable for type collections (including IAsyncEnumerable overloads) and WhichAreImmutable / WhichAreNotImmutable filters. A type is considered immutable when all instance fields (including inherited ones) are readonly and all instance properties (including inherited ones) have no setter or an init-only setter; init-only setters count as immutable, static members are ignored. Failure messages list the offending mutable members for actionable feedback.
Pin behavior for structs (mutable and readonly), record structs (positional with set vs readonly with init), positional records, enums, interfaces (settable vs get-only properties), static classes, indexers with setters, properties with private setters, inherited non-private mutable fields and open generic type definitions. Fix Sonar findings: make the static fixture field private (S2223) and replace the TheoryData collection expressions with object initializers to avoid zero-length array allocations (CA1825).
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🚀 Benchmark ResultsDetails
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👽 Mutation ResultsaweXpect.ReflectionDetails
The final mutation score is 83.25%Coverage Thresholds: high:80 low:60 break:0 |
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IsImmutable/IsNotImmutablefor single types,AreImmutable/AreNotImmutablefor type collections (includingIAsyncEnumerableoverloads) andWhichAreImmutable/WhichAreNotImmutablefilters.A type is considered immutable when all instance fields (including inherited ones) are readonly and all instance properties (including inherited ones) have no setter or an init-only setter; init-only setters count as immutable, static members are ignored. Failure messages list the offending mutable members for actionable feedback.