anchor.diff:          Skip,
           GroupLevel,
           Group,
  -        Stable,
  -        Update,
  +        Stale,
           MultiGet,
           InclusiveEnd,
           IncludeDocs,
  
positive.code:         skip = Skip,
          group_level = GroupLevel,
          group = Group,
          stale = Stale,
          multi_get = MultiGet,
          inclusive_end = InclusiveEnd,
          include_docs = IncludeDocs,
  
negative.code:         Callback,
          Sorted,
          Extra}) ->
      {Stable, Update} = case Stale of
          ok -> {true, false};
          update_after -> {true, lazy};
          _ -> {false, true}
      end,
      #mrargs{
          view_type = ViewType,
  