Deepseq proposed patch

[Julian Blake Kongslie]

Stephen Tetley wrote:
> Don't Data.Data and traversals through gmapQ etc have a reputation for
> being particularly slow? (most newer generics libraries benchmark
> against it to show their swiftness).

That is an excellent point, and one that I hadn't really considered - on 
profiling, the cases that /I/ care about spend the vast majority of 
their time actually evaluating thunks rather than in gmapQr, but I don't 
pretend that I'm a universal case and I'm sympathetic to those with 
stronger performance needs.

-Julian Blake Kongslie
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