base haddocks at ghc.gitlab.haskell.org/ghc/doc/libraries link to non-hyperlinked source for ghc-bignum
The source link at https://ghc.gitlab.haskell.org/ghc/doc/libraries/base-4.16.0.0/Numeric-Natural.html#t:Natural resolves to https://ghc.gitlab.haskell.org/ghc/doc/libraries/ghc-bignum-1.3/src/GHC-Num-Natural.html#Natural which contains non-hyperlinked source code. It would be better to link to the hyperlinked source at https://ghc.gitlab.haskell.org/ghc/doc/libraries/ghc-bignum-1.3/src/GHC.Num.Natural.html#Natural.