∀ {𝕜 : Type u_1} {F : Type u_2} [inst : RCLike 𝕜] [inst_1 : SeminormedAddCommGroup F] [inst_2 : NormedSpace 𝕜 F]
  [inst_3 : NormedSpace ℝ F] [inst_4 : IsScalarTower ℝ 𝕜 F] (fr : StrongDual ℝ F),
  ‖ContinuousLinearMap.extendTo𝕜' fr‖ = ‖fr‖