I would just tell my coworkers in private and say my farewells that way, but specify to not spread it around because it was asked that I not for some reason I d

I would just tell my coworkers in private and say my farewells that way, but specify to not spread it around because it was asked that I not for some reason I don't understand. Your coworkers will spread it around themselves but hopefully not get back to your boss. If it does, just say you only told one person in confidence because of your personal relationship, and didn't intend for it to spread. This solution is good because if your boss tries to bullshit your team, like say you were fired, they will know it's not true but they aren't going to try to contradict your boss either.