viewholder

ibrahimyilmaz/kiel#40 added syntax to define Diff callback for whole adapter. But you still have no ability to define diff callback for register blocks separately.

There is example of how it may look like:

adapterOf<Animal> {
    register(
        layoutResource = R.layout.item_cat,
        viewHolder = ::CatHolder,
        diff = diff(
            areIt