Proposal: deepseq should not depend on containers

[Milan Straka]

Hi,

> Ticket:
> 
> http://hackage.haskell.org/trac/ghc/ticket/4868
> 
> Copy of proposal:
> 
> The  deepseq package depends on the  containers package. This forces
> all packages that want to depend on deepseq in order to provide a
> NFData instance for exported types, to also depend on containers.
> 
> Proposal, have containers depend on deepseq, not the other way around,
> and define the NFData instances for the types in the containers
> package, in the containers package.

+1.

Not only is it more appealing that way, the instances will also be more
efficient.

Cheers,
Milan