Also, on "poison objects". We execute Javascript all the time in our browsers. Sandboxing and other measures keep the executable objects from exploiting our com

Also, on "poison objects". We execute Javascript all the time in our browsers. Sandboxing and other measures keep the executable objects from exploiting our computers. It's imperfect, of course, and there are still exploits, but that's the general approach. Things like out-of-order execution and so forth require careful parallel design, but that's pretty much the bread-and-butter of things like SETI@Home