Deserializing to std::borrow::Cow<str> always allocates #1852
Description
// [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"),
}
}Expected result
"hello"
borrowed
Because string hello appears in the data as is, with no escaping or reader buffer boundaries.
Actual result
"hello"
owned