No, thank you for replying. I'm not sure I deserve it -- a little while after I posted, I realized that my C# in many cases missed the point, and in a couple was flat out wrong (BitSet). That led me down a path of researching more about Scala ... and after some neat reading, my "gotta get back to real work" timer dinged, and I never got back here to clarify. So thank you for the insightful and detailed reply. My post's main value was in eliciting yours :).