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I've choose `MainThread` for my dispatcher because it self explaning for Android developers, and has the same semantics like CommonPool ("run coroutine in main thread” similar with "run coroutine in common pool”).
`android.support.annotation.MainThread` is not so popular, but useful annotation. 
And I think you are right that we should choose another name for dispatcher to avoid naming conflict
Probably `UI` is the best candidate. It’s not so correct as `MainThread` but very short and actually describes the most popular use case