∀ {α : Type u} {β : Type v} [inst : BEq α] [PartialEquivBEq α] {l : List ((_ : α) × β)} {k a : α} {v : β},
  Std.Internal.List.getValue? a (Std.Internal.List.insertEntry k v l) =
    if (k == a) = true then some v else Std.Internal.List.getValue? a l