ekmett/lens — pull request #485 by Taneb (2014-10-01 21:56:43+00:00)
Title: Separate zlib support into a different package.

* zlib is unnecessary for the main functioning of lens
* zlib introduces an extra non-Haskell dependency which some people (for example, me) wouldn't otherwise have installed

I have created the repo https://github.com/Taneb/lens-zlib which I will move to the lens account if this gets merged.