RunLoop.main as a Scheduler ends up calling RunLoop.main.perform whereas DispatchQueue.main calls DispatchQueue.main.async to do work, for practical purposes they are nearly isomorphic. The only real differential is that the RunLoop call ends up being executed in a different spot in the RunLoop callouts whereas the DispatchQueue variant will perhaps execute immediately if optimizations in libdispatch kick in. In reality you should never really see a difference tween the two.
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