PROPOSAL: Add instances to Data.Monoid newtype wrappers

[Yitzchak Gale]

Sean Leather wrote:
> newtype wrappers in Data.Monoid...
> I would like to add Functor instances for all
> parameterized types, where applicable
> (i.e. Dual, Sum, Product).
> In general, I think we should add whatever other
> instances make sense. Data came to mind.

+1

> Others?

NFData. But that's not in base, so those instances
need to be added in the deepseq library.

-Yitz
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