∀ {α₁ : Type u_8} {β₁ : Type u_9} {α₂ : Type u_10} {β₂ : Type u_11} [inst : MeasurableSpace β₁]
  [inst_1 : MeasurableSpace β₂] (hα : α₁ ≃ α₂) (hβ : β₁ ≃ᵐ β₂),
  MeasurableEquiv.arrowCongr' hα hβ = { toEquiv := hα.arrowCongr' ↑hβ, measurable_toFun := ⋯, measurable_invFun := ⋯ }