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DiffCallback<T> Callback that informs PagedListAdapterHelper how to compute list updates when using DiffUtil on a background thread. 
ListAdapter<T, VH extends RecyclerView.ViewHolder> RecyclerView.Adapter base class for presenting List data in a RecyclerView, including computing diffs between Lists on a background thread. 
ListAdapterConfig<T> Configuration object for ListAdapter, ListAdapterHelper, and similar background-thread list diffing adapter logic. 
ListAdapterConfig.Builder<T> Builder class for ListAdapterConfig
ListAdapterHelper<T> Helper object for displaying a List in RecyclerView.Adapter, which signals the adapter of changes when the List is changed by computing changes with DiffUtil in the background. 
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