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# kCTTypesetterOptionAllowUnboundedLayout

A key that specifies whether the text system lays out text that requires unreasonable effort.

```
let kCTTypesetterOptionAllowUnboundedLayout: CFString
```

## Discussion

Proper Unicode layout of some text requires unreasonable effort. By default, the text system avoids expending this effort. To create a typesetter that always typesets the text, regardless of the amount of work needed, call [`CTTypesetterCreateWithAttributedStringAndOptions(_:_:)`](/documentation/CoreText/CTTypesetterCreateWithAttributedStringAndOptions(_:_:)) and set this option to <doc://com.apple.documentation/documentation/CoreFoundation/kCFBooleanTrue>.

The value for this key must be a `CFBooleanRef`. The default value is <doc://com.apple.documentation/documentation/CoreFoundation/kCFBooleanFalse>.

---

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