Exception when changing value of `HMMutablePresenceEvent.presenceUserType` and `HMMutablePresenceEvent.presenceEventType`

Number:rdar://33825198 Date Originated:10-08-2017
Status:Open Resolved:
Product:HomeKit Product Version:iOS 11 beta 4
Classification:Crash Reproducible:Always
New to HMPresenceEvent on iOS 11 beta 5 are `presenceUserType` and `presenceEventType`. But the value of those properties cannot changed for objects of type `HMMutablePresenceEvent`.

Steps to Reproduce:
Create an object of type `HMMutablePresenceEvent` and try to change the value of `presenceUserType` or `presenceEventType`.

Expected Results:
Setting a new value for those properties should not raise an exception.

Observed Results:
Setting a new value for those properties raises an exception.

Xcode 9.0 beta 5 (9M202q)


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