I remember seeing this in React's __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED, and I've always enjoyed similar lighthearted and unwieldingly-long names.
Unfortunately I see it too has fallen victim to defunnification: https://github.com/facebook/react/pull/28789
Could have added a futurama reference to it
__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED_______OUT_OF_A_CANNON___INTO_THE_SUN
Fun names are OK, but only if they don't introduce ambiguity. In this case the change wasn't so much anti-fun as anti-ambiguity.