∀ {α : Type u_1} {β : Type u_2} {m : MeasurableSpace α} [inst : Zero β] {μ : MeasureTheory.Measure α}
  (f : MeasureTheory.SimpleFunc α β), (∀ (y : β), y ≠ 0 → μ (⇑f ⁻¹' {y}) < ⊤) → μ (Function.support ⇑f) < ⊤