Proposal: Remove Semigroup and Monoid instances for Data.Map, Data.IntMap, Data.HashMap

M Farkas-Dyck m.farkasdyck at
Tue Feb 13 23:44:15 UTC 2018

I am strongly in favor of parts 1 and 2, and HVR's proposal for
immediately defining new instances with a major version bump — this is
what major versions are for, and if we leave them undefined, it will
encourage users to define orphan instances.

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