I'm not an expert in the wording, but you can read quotes from several people on it, and it's clear that they were blind or mostly blind prior to the act. By "mostly blind", I mean things like a verbal vote, but at a time that would be hard to predict, and no CSPAN, paper transcript, etc, to record what exactly happened other than the totals.
I see a bunch of changes, but you could still see whom voted for what. Or, I read it wrong?