Return NSError for invalid keyed unarchive data#606
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Add narrow nullability annotations for the first Phase 4B core Foundation tranche without touching collection headers, module maps, or non-core surfaces. Keep the remaining judgment-call annotations conservative: - NSString legacy C-string decoding entry points stay nullable where decoding can return nil even though NULL C string inputs still raise. - NSURL initWithScheme:host:path: stays nullable because it funnels through initWithString:relativeToURL:, which can still fail for constructed non-ASCII URL text. - NSData bytes and mutableBytes stay nullable because zero-length concrete storage may legitimately expose a NULL backing pointer.
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This was referenced May 5, 2026
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Summary
Validation