Re: [containers] Proposal: Change to the Data.Map Monoid

Am 19.05.2014 02:05, schrieb Nick Partridge:

instance Monoid v => Monoid (Map k v) where mappend = unionWith mappend

This lets us build up maps with values in a useful Monoid, and mappend them with gusto.

This was discussed two years ago: http://www.haskell.org/pipermail/libraries/2012-April/017743.html That said, I'd also prefer your instance.