message: transform_view: Don't violate [over.load]/2.2
diff: @@ -383,9 +383,9 @@ namespace ranges
  , rng1_(std::move(rng1))
  , rng2_(std::move(rng2))
  {}
  - CPP_member
  - static constexpr auto size() -> CPP_ret(size_type_)(
  + CPP_template(int = 42)(
  requires my_cardinality >= 0)
  + static constexpr size_type_ size()
  {
  return static_cast<size_type_>(my_cardinality);
  }
  