for i := 0; i < b.N; i++ {
		q := values[i%len(values)]
		q.s = ""
		if _, err := q.MarshalJSON(); err != nil {
			b.Fatal(err)
		}
	}
	b.StopTimer()
}

func BenchmarkQuantityUnmarshalJSON(b *testing.B) {
	values := benchmarkQuantities()
	var json [][]byte
	for _, v := range values {
		data, _ := v.MarshalJSON()
		json = append(json, data)
	}

	b.ResetTimer()