  │    before    │              after              │
  │    sec/op    │    sec/op     vs base           │
X   100.0n ± ∞ ¹   101.0n ± ∞ ¹  ~ (p=1.000 n=1) ²
¹ need >= 6 samples for confidence interval at level 0.95
² need >= 4 samples to detect a difference at alpha level 0.05