TYP: callable refactor for apply methods in styler
unrelated question: if i'm in pandas-core can I be added as a maintainer to `config.yml`?
> unrelated question: if i'm in pandas-core can I be added as a maintainer to config.yml?

Yes, absolutely - this _should_ be part of the process of adding maintainers, but is often forgotten. Sorry for not having picked up on this sooner > So, this is necessary because the return type isn't guaranteed to be `Styler`, right? If so, looks good to me

correct