}

var bmbuf []byte

func valName(x int) string {
	if s := x >> 20; s<<20 == x {
		return fmt.Sprintf("%dM", s)
	}
	if s := x >> 10; s<<10 == x {
		return fmt.Sprintf("%dK", s)
	}
	return fmt.Sprint(x)
}

func benchBytes(b *testing.B, sizes []int, f func(b *testing.B, n int)) {
	for _, n := range sizes {
		if isRaceBuilder && n > 4<<10 {
			continue
		}
		b.Run(valName(n), func(b *testing.B) {

				t.Errorf("%s: len(Peek(%d)) = %v; want %v", tt.name, tt.peekSize, len(peekBuf), tt.peekSize)
				continue
			}
		}
		discarded, err := br.Discard(tt.n)
		if ge, we := fmt.Sprint(err), fmt.Sprint(tt.wantErr); discarded != tt.want || ge != we {
			t.Errorf("%s: Discard(%d) = (%v, %v); want (%v, %v)", tt.name, tt.n, discarded, ge, tt.want, we)
			continue
		}
		if bn := br.Buffered(); bn != tt.wantBuffered {