When you rename yourself you get a new save file. (v59)
I'm playing version 59.
If I save a character under one name, then rename the character later and save it now I have two characters I can load up.
So, if I were to check on how tough the Fire Tower is, I could rename my guy like "FireTower Checker", save the game, then reload him then go explore it. And if it went bad I could just reload my guy from before the rename.
I know it used to not do this cause I renamed some of my people and I didn't new save files. But I'm talking about way back in the version before the kickstarter.
To reproduce, just save a character. Then when you load them back up rename them then save it again. You will have two character files.
I just did it myself a few times to be sure it wasn't a random bug that happened.
So I think this is probably a bug and not a feature.
I am playing on a Mac with NotEye, but I don't know if this affects other systems or not.
Thanks!