∀ {α : Type u_1} {β : Type u_2} [inst : MeasurableSpace α] [inst_1 : TopologicalSpace α] [BorelSpace α]
  {mβ : MeasurableSpace β} [inst_3 : TopologicalSpace β] [BorelSpace β] {μ : MeasureTheory.Measure β} [μ.InnerRegular]
  (f : α ≃ₜ β), (MeasureTheory.Measure.comap (⇑f) μ).InnerRegular