You make an interesting point, one I hadn't considered, which is code readability. It certainly is easier to read. That being said, you could still take a loo

You make an interesting point, one I hadn't considered, which is code readability. It certainly is easier to read. That being said, you could still take a look at what frob and zap do, and figure out what the value of foo was, assuming it was thread local/not shared.