rhai (smartstring) breaks std::string::String

[DSeeLP]

Rhai depends on smartstring which contains a regression that breaks std::string::String in projects depending on smartstring and by extend rhai.
bodil/smartstring#7

fn main() {
    let a = "Hello ".to_string();
    let b = "World!".to_string();
    let c = a + &b; // Breaks here
    println!("{c}");
}

This code works when not depending on rhai or smartstring.
When inserting use smartstring or use rhai it breaks compilation with this error:

error[E0277]: cannot add `&String` to `String`
 --> src/main.rs:5:15
  |
5 |     let c = a + &b;
  |               ^ no implementation for `String + &String`
  |
  = help: the trait `Add<&String>` is not implemented for `String`
  = help: the following other types implement trait `Add<Rhs>`:
            <String as Add<&str>>
            <String as Add<smartstring::SmartString<Mode>>>

[schungx]

Not sure what we can do about this though...