I have see that the project homepage do not respond anymore:
https://john-millikin.com/software/data-binary-ieee754/

I think that the homepage is now:
https://hackage.haskell.org/package/data-binary-ieee754

note that the author say that this library is obsolete and replaced by
cereal:
https://john-millikin.com/software

Ciao
Davide

Note: this is a simplified bug report that I use to report homepage
problems found at https://repology.org/repository/debian_testing/problems