> make them look like a GIANT EYESORE

React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED comes to mind. I did have to reach to this before, but it certainly works for keeping this out of example code and other things like reading other implementations without the danger being very apparent.

At some point it was renamed to __CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE which is much less fun.