Resolved: why does rust allow comparison between &String and string slice?

fn main() {
    println!("hello hello");
    let s = String::from("something");
    assert_eq!(&s, "something");
    println!("able to compare &String with a string slice");
}

Finished dev [unoptimized + debuginfo] target(s) in 0.03s
     Running `target/debug/SomePrototype`
hello hello
able to compare &String with a string slice`