[douglashunter]

Well, that's embarrassing. I fat-fingered those while I was transcribing code into the article. "Surprise Two" was supposed to be about the autovivification surprise, not me mistyping things (article updated).

Even still, your point about using objects and encapsulation stands. If the session were being assigned to via setters, and read from with getters, the grep aliasing wouldn't do its damage.

Cheers.