My understanding is that they sent V'Ger a command to do "something," and then the gibberish it was sending changed, and that was the "here's everything" signal.
Sure - I didn't know what "something" was. And what I'd read was that someone had to figure out that they were receiving a full memory dump, which suggested to me that they hadn't specifically asked for that.
Only so long as we ensure we keep a stable humpback whale population. I don't wanna be the guy that has to figure out how to make a temporal slingshot maneuver work.