Interesting. Is RGSS3 moving to a zero-index standard? I haven't had a chance to browse the new scripts yet.
RGSS3 is a library, it has nothing to do with ruby the language, which has always used zero-indexed arrays.
If you look at the $data collections you will see that they are padded at the beginning as to allow more natural access to elements based upon their id in the database.
Yeah, I later checked up on it, thinking the same applied to other collections like $game_party.members, so when Yanfly mentioned 0 - 1st member, I was thinking they removed the padding. It was a herp derp post on my part.