How to properly return persisted ID with RequestFactory+Editor

With a normal Request, I can specify a return type on an InstanceRequest. However, when using RequestContext with the Editor framework, the Receiver argument to fire() only accepts a Void generic type. This means that I can no longer return the persisted ID of the object back to the client without making a subsequent request based on the stable ID.

What are the reasons behind this decision? Is the second call to the server my only option for this functionality?

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