Specialized mergable stores are now implemented in terms of composing ConvertableStores. One thing that was a surprise was this compilation type error the convertable stores when I didn't explicitly provide its type args. https://gist.github.com/softprops/ee49e634d5a13b6bad89

Also I was wondering if some of the [redis conversion utils](https://github.com/twitter/finagle/blob/master/finagle-redis/src/main/scala/com/twitter/finagle/redis/util/Conversions.scala) should live in the [netty bijection module](https://github.com/twitter/bijection/blob/develop/bijection-netty/src/main/scala/com/twitter/bijection/netty/ChannelBufferBijection.scala) I'll volunteer to port some of those over if that's cool with you guys. 

Lastly, I looks like the netty bijections are [mis-packaged](https://github.com/twitter/bijection/blob/develop/bijection-netty/src/main/scala/com/twitter/bijection/netty/ChannelBufferBijection.scala#L17) :) I can fix that too if you guys want.

Last thing to look at now is set/list support. I think I finally get unpivoted stores now. I'll take @avibryant's advice and try to do them in terms of those.