               │    before     │                after                │
               │    sec/op     │    sec/op     vs base               │
FloatSub/100-4   115.00n ± ∞ ¹   78.80n ± ∞ ¹  -31.48% (p=0.008 n=5)
¹ need >= 6 samples for confidence interval at level 0.95