∀ {α : Type u_1} {f : α → ℚ → ℝ} [inst : MeasurableSpace α] (hf : ProbabilityTheory.IsMeasurableRatCDF f) (a : α)
  (x : ℝ), (hf.stieltjesFunction a).measure (Set.Iic x) = ENNReal.ofReal (↑(hf.stieltjesFunction a) x)