So, yesterday I tripped and my display name broke in half. I figured I would fix it in the morning, but when I checked back, I got the banner for recent responses, and clicked it. I noticed that I had comment responses for both "@ccomet" and "@ccornet" listed.
I was originally going to ask how it knew to attribute both to me, but I figured that logically the system just permanently attaches the comment to my account when it is made, so it wouldn't matter that my display name changed at a later point. There wouldn't be a complex system which remembers when I had what display name, and figure out comment replies based on a lookup.
But that line of thought made me come to a different question of curiosity. Does Stack Overflow actually track the history of display name changes? There's been requests for seeing the recent names of a user, and we all know that massive post detailing voyager's shenanigans. But there's nothing, at least as far as I've delved, that actually explains whether or not our display names are mechanically recorded or not. Are they?