anchor.diff:                  | None -> asyncVal { return ResolverError { Name = name; Message = ctx.Schema.ParseError (GraphQLException (sprintf "GraphQL Interface '%s' is not implemented by the type '%s'" idef.Name resolvedDef.Name)); PathToOrigin = [] } }
               | None ->
                   if ctx.ExecutionInfo.IsNullable
  -                then asyncVal { return ResolverObjectNode { Name = name; Value = None; Children = [| |] } }
  +                then asyncVal { return ResolverObjectNode { Name = name; Value = None; DeferredValue = value; Children = [| |] } }
                   else nullResolverError name
           | Union udef ->
               let possibleTypesFn = ctx.Schema.GetPossibleTypes
  
positive.code:                                     | t -> build (t::acc) xs
                                  return res
                              }
                  | [] -> asyncVal { return ResolverListNode { Name = name; Value = value; Children = acc |> List.rev |> List.toArray } }
              match value with
              | None when not ctx.ExecutionInfo.IsNullable -> nullResolverError name
              | None -> asyncVal{ return ResolverListNode{ Name = name; Value = None; Children = [| |]; } }
              | ObjectOption (:? System.Collections.IEnumerable as enumerable) ->
                  enumerable
                  |> Seq.cast<obj>
  
negative.code:         | ResolverError _ -> None
          | ResolverObjectNode node -> node.Value
          | ResolverListNode l -> l.Value
      member x.DeferredValue =
          match x with
          | ResolverLeaf leaf -> leaf.DeferredValue
          | ResolverError _ -> None
          | ResolverObjectNode node -> node.DeferredValue
          | ResolverListNode l -> l.DeferredValue
  and ResolverLeaf = { Name: string; Value: obj option; DeferredValue : obj option }
  and ResolverError = { Name: string; Message: string; PathToOrigin: obj list; }
  and ResolverNode = { Name: string; Value: obj option; DeferredValue : obj option; Children: ResolverTree []; }
  
  module ResolverTree =
      let fold leafOp errorOp nodeOp listOp =
  