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

More specifically (this feature). It could be a practical way forward to provide one artifact which covers future Java versions (java 9+).

visit currently simply panic!'s on errors.