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# kCFURLKeysOfUnsetValuesKey

Key for the resource properties that have not been set after the [`CFURLSetResourcePropertiesForKeys(_:_:_:)`](/documentation/CoreFoundation/CFURLSetResourcePropertiesForKeys(_:_:_:)) function returns an error, returned as an array of `CFString` objects.

```
let kCFURLKeysOfUnsetValuesKey: CFString!
```

---

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