∀ {α : Type u} {β : α → Type v} [inst : BEq α] [inst_1 : LawfulBEq α] {l : List ((a : α) × β a)} {k a : α} {v : β k},
  (k == a) = false → Std.Internal.List.getValueCast? a (⟨k, v⟩ :: l) = Std.Internal.List.getValueCast? a l