Why concurrency? And why advocate a particular solution? A good solution, in my experience, isn't any particular implementation: it's to think about it, really

Why concurrency? And why advocate a particular solution? A good solution, in my experience, isn't any particular implementation: it's to think about it, really hard, using tools that help you think about hard things... like math. "Actors," is like... soy sauce. However there were nuggets of gold in the original. Looking forward to finding the new bits and gems again.