Preliminary implementation of type-level difference.
Preliminary implementation of type-level difference.

isaka/shapeless,lukasz-golebiewski/shapeless,milessabin/shapeless,clhodapp/shapeless,lambdista/shapeless,fthomas/shapeless,malcolmgreaves/shapeless,tek/shapeless,alexarchambault/shapeless,khronnuz/shapeless,liff/shapeless,TomasMikula/shapeless,joescii/shapeless,roberth/shapeless,Atry/shapeless,retronym/shapeless,notxcain/shapeless,triggerNZ/shapeless,wheaties/shapeless