That isn't subject to the libraries@ proposal process. It is however, actively being debated over in #haskell-lens and onĀ 

https://github.com/ekmett/lens/issues/347


On Fri, Oct 11, 2013 at 8:44 PM, Artyom Kazak <yom@artyom.me> wrote:
On Sat, 12 Oct 2013 03:59:15 +0400, John Wiegley <johnw@fpcomplete.com> wrote:

Edward Kmett <ekmett@gmail.com> writes:

I'd be willing to risk the pain of switching to = for the functional versions
of the functions rather than ~ if a majority of users wanted it that way.

+1 for (.=).


Maybe it should be made a separate proposal?

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