True, I was originally going to name it `gender_flipper`, but someone made the same point, so I called it `gender_bender`.

This way, the name will still make sense if the ability to go from gendered pronouns to genderless pronouns ("singular they" or "ze") is added. PRs are welcome!

For now, I just put "Flip gender" in the title of this HN post to more accurately reflect what the package does today.