Optimistic update API version 1.3

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I am currently using code like below to do an optimistic update. It just doesn't seem like a very good API because I am having to duplicate the optimistic data in the mutate function and optimisticData. One place uses the data passed to the function and the other is using the original data from the initial fetch. This seems to stem from the delete fetcher not returning the new data.

Am I missing something or is this the best approach for optimistic updates with v 1.3?

      mutate(
        async (data) => {
          await fetcher(deleteDataQuery, { cursor } );
          return {
            ...data,
            data: {
            edges: [
              ...data.edges.filter(
                (edge) => edge.cursor !== cursor
              ),
            ],
            },
          };
        },
        {
          optimisticData: {
            ...originalData,
            edges: [
              ...originalData.edges.filter(
                (edge) => edge.cursor !== cursor
              ),
            ],
          },
        }
      );