I wonder if the Phoenix guys are thinking D'OH! right now. This approach looks quite compelling.
VM, comparable to the one of Hotspot, which has God knows how many man-hours put into it. Isn't it wonderful when new and simple ideas shatter old and complex ones? Beautiful code.
dynamic - adding and removing properties and methods at runtime.
I love simple I'm also interested to know what the Phoenix guys think about these kind of ideas... but they might already know, since this was a paper that has been presented at POPL.