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Improve Object's internal extendability (#3377)

* Improve Object's internal extendability

Internally we extend `Region`, `Behavior`, and `Application` from `Object`.
For each of these cases we call `_setOptions` in the various classes, but then it is also called again by `Object`.  This adds a minor perf improvement by not re-calculating `this.options`.
Similarly while looking into `Region` refactors I found it would be useful to know the `cid` in order to throw an error, but it wasn't available to the constructor.  This would allow us to set it once reliably.

* Improve Object tests

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