∀ {Ω : Type u_1} {ι : Type u_3} {m : MeasurableSpace Ω} [inst : LinearOrder ι] {f : MeasureTheory.Filtration ι m}
  {τ : Ω → WithTop ι} [inst_1 : TopologicalSpace ι] [inst_2 : OrderTopology ι] [SecondCountableTopology ι],
  MeasureTheory.IsStoppingTime f τ → ∀ {i : ι}, (∀ (ω : Ω), τ ω ≤ ↑i) → Measurable τ