Alternative to importing GHC.TypeLits?

The GHC manual gives code examples that import GHC.TypeLits. The documentation on that module seems to request that users /not/ import it ...

This module is an internal GHC module. [...] The programmer interface for working with type-level naturals should be defined in a separate library.

... although I'm not sure what "what be" means here. Does that mean it's a to-do item, and that there will eventually be a separate library, but that we should use this "internal" library directly for now? --- GHC manual: https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/glasgow_exts... GHC.TypeLits: https://www.stackage.org/haddock/lts-8.5/base-4.9.1.0/GHC-TypeLits.html