FWIW, I wrote bz2 (http://hackage.haskell.org/package/bz2) which works with GHC 8.8+

Both bz2 and bzlib implement bzip-signature (http://hackage.haskell.org/package/bzip-signature), which as of cabal-install 3.2.0.0 is a good option if you want to try bz2 "risk-free"

https://gist.github.com/hasufell/a5f1091646d1b891e6d2a73714dbb50e

Last time I pinged duncan he seemed to have forgotten it. If you don't
mind sharing maintainership, please do so.

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