{C : Type u₁} →
  {inst : CategoryTheory.Category.{v₁, u₁} C} →
    {J : CategoryTheory.GrothendieckTopology C} →
      {R : CategoryTheory.Sheaf J RingCat} → {X Y : SheafOfModules R} → [SizeOf C] → X.Hom Y → ℕ