`strong::range` modifier compiler errors for `std::set` in v15

Since v15, wrapping a `std::set` in a strong type with the `strong::range` modifier, causes compiler errors, i.e.

```
using Set = strong::type<std::set<std::string_view>, struct Set_, strong::range>;
```

See https://godbolt.org/z/fM6q543dc (change to v14 and the program runs fine).

