I had another look at my dependently-typed actors in Impromptu before my @scalaexchange talk tomorrow. By reimplementing Scala's TypeTag with a simpler equivalent (but still correct and sufficient for Impromptu's needs), I was able to improve performance by a factor of six!
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But why use an actor if you're not hiding mutable state? If you are, my sympathies.
I didn't have a particular use case in mind when I wrote it, but if mutable state is a given precondition, then I want to do my best to hide it!
