* GHC.Natural isn't implemented in `base` anymore. It is provided by
  ghc-bignum in GHC.Num.Natural. It means that we can safely use Natural
  primitives in `base` without fearing issues with built-in rewrite
  rules (cf #15286)

* `base` doesn't conditionally depend on an integer-* package anymore,
  it depends on ghc-bignum

* Some duplicated code in integer-* can now be factored in GHC.Float

* ghc-bignum tries to use a uniform naming convention so most of the
  other changes are renaming