To be clear, I've also left `add_season()`, `add_month()`, etc. using just "season", "month", etc. It keeps the default case concise, but it also keeps it consistent - win, win.

I agree "season_month_initials" is a bit of a mouthful, but I wouldn't really expect anyone to use `add_season_month_initials()` when they can just use `add_season()` instead.