for _, n := range sizes {
		if isRaceBuilder && n > 4<<10 {
			continue
		}
		b.Run(valName(n), func(b *testing.B) {
			if len(bmbuf) < n {
				bmbuf = make([]byte, n)
			}
			b.SetBytes(int64(n))
			f(b, n)
		})
	}
}

var indexSizes = []int{10, 32, 4 << 10, 4 << 20, 64 << 20}

var isRaceBuilder = strings.HasSuffix(testenv.Builder(), "-race")

	content := make([]byte, size)

	for i := 0; i < dataDown; i++ {
		disks[i] = OfflineDisk
	}
	for i := data; i < data+parityDown; i++ {
		disks[i] = OfflineDisk
	}

	b.ResetTimer()
	b.SetBytes(size)
	b.ReportAllocs()
	for i := 0; i < b.N; i++ {
		writers := make([]io.Writer, len(disks))
		for i, disk := range disks {
			if disk == OfflineDisk {
				continue
			}

	}

	for i := 0; i < dataDown; i++ {
		writers[i] = nil
	}
	for i := data; i < data+parityDown; i++ {
		writers[i] = nil
	}

	b.ResetTimer()
	b.SetBytes(size)
	b.ReportAllocs()
	for i := 0; i < b.N; i++ {
		bitrotReaders := make([]io.ReaderAt, len(disks))
		for index, disk := range disks {
			if writers[index] == nil {
				continue
			}

pkg math/big, method (*Int) Set(*Int) *Int
pkg math/big, method (*Int) SetBit(*Int, int, uint) *Int
pkg math/big, method (*Int) SetBits([]Word) *Int
pkg math/big, method (*Int) SetBytes([]uint8) *Int
pkg math/big, method (*Int) SetInt64(int64) *Int
pkg math/big, method (*Int) SetString(string, int) (*Int, bool)
pkg math/big, method (*Int) Sign() int
pkg math/big, method (*Int) String() string