Commit 2021-06-13 11:45 6d2a0512

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feat(algebra/covariant_and_contravariant): API for covariant_and_contravariant (#7889) This PR introduces more API for covariant and contravariant stuff . Besides the API, I have not actually made further use of the typeclasses or of the API. This happens in subsequent PRs. This is a step towards PR #7645.

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