Represents the current user presence state detected by the device.
See Also: XRDevice.userPresence.
| Unsupported | The device does not support detecting user presence. | 
| NotPresent | The device does not detect that the user is present. | 
| Present | The device detects that the user is present. | 
| Unknown | The device is currently in a state where it cannot determine user presence. | 
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