Run-This?

Premises

1. Keep an Actor mono-threaded by means of a ProxyInvoker
2. Optimize for ValueTask calls, by making callers wait for an ExecutionSlot, and only then execute the call. This means that OneWay calls are defined by the user on a per call basis, just like on traditional .NET TPL.

No 2 seems to be achievable by simply not awaiting any calls, and just letting the .NET Threadpool do its thing. Therefore, no special dispatcher (work consumer/scheduler) needed.