for pb.Next() {
			// some problems appear with random access, some appear with many
			// requests for a single entry, so we do both.
			s.doAuthForTokenN(r.Intn(s.tokenCount), a)
			s.doAuthForTokenN(0, a)
		}
	})
	b.StopTimer()

	b.ReportMetric(float64(lookups)/float64(b.N), "lookups/op")
}