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@dougmerritt
a while ago, I think you asked me whether it was important to have an action queue with both push and append, like I made. I found so far that while I originally only-used-append, now I'm basically only-using-push (and generally resolving as fast as being pushed).
I originally modelled this on VHDL, which has two useful notions of time passing:
~ signals, but also processes. It's not defined what "happens first" on a signal. But processes force an order in infinitesimal deltas.