The ghc-cryptohash packages builds both ghc-cryptonite and ghc-memory [1]. Why is this the case?

I spent a long time trying to figure out where I was getting ghc-memory from when it could not be found on packages [2], koji [3], bodhi [4], or release-monitoring [5]. It's only when I looked for the RPM on koji did I figure out it's a subpackage, because that's just totally unexpected, especially because there's an open review request for it [6].

[1] https://src.fedoraproject.org/cgit/rpms/ghc-cryptohash.git/tree/ghc-cryptohash.spec#n20
[2] https://apps.fedoraproject.org/packages/s/ghc-memory
[3] https://koji.fedoraproject.org/koji/search?match=glob&type=package&terms=ghc-memory
[4] https://bodhi.fedoraproject.org/updates/?packages=ghc-memory
[5] https://release-monitoring.org/projects/search/?pattern=memory
[6] https://bugzilla.redhat.com/show_bug.cgi?id=ghc-memory

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Elliott