// [dependencies]
// serde_json = "1.0.41"
fn main() {
    let v = "hello";
    let s = serde_json::to_string(&v).unwrap();
    println!("{}", s);
    let v2: std::borrow::Cow<str> = serde_json::from_str(&s).unwrap();
    match v2 {
        std::borrow::Cow::Borrowed(..) => println!("borrowed"),
        std::borrow::Cow::Owned(..) => println!("owned"),
    }
}