Disable auto-generated HasLens instances for tuples. The reason one might want to do this is to reduce the size of .hi-files, as well as the time and memory GHC needs to build Ether. To recover flattening with tuples, use Ether.Internal.makeTupleInstancesHasLens at specific tuple sizes you need in your application. This is a build-time performance hack, enable this flag at your own risk.