single message aggregator was there based on the false assumption that aggregation using the auxilary public key doesn't work with multi message aggregation but @AlistairStewart thinks that there is no reason it won't work so we are going to remove that.
single message aggregator was there based on the false assumption that aggregation using the auxilary public key doesn't work with multi message aggregation but @AlistairStewart thinks that there is no reason it won't work so we are going to remove that.