New blog post! I set out to dump an arcade game and correct MAME's database, only to end up discovering that this game revision didn't actually exist in the first place - or rather, once properly dumped, it was actually a duplicate of another one.
A real #digipres lesson here, and a reminder that even widely-used and well-maintained catalogues are fallible. It can be just as important to deduplicate entries and remove phantom ones as to discover new ones.