serde yaml bug

Cargo.toml

[package]
name = "yamltest"
version = "0.1.0"
edition = "2021"

[[bin]]
name = "yamltest"
path = "main.rs"

[dependencies]
serde = { version = "1", features = ["derive"] }
serde_yaml = "0.9"

main.rs

use serde::Deserialize;

#[derive(Debug, Deserialize)]
struct Frob {
    foo: u32,
}

fn main() {
    let value: serde_yaml::Value = serde_yaml::from_str(
        r#"
---
"foo": !!int |-
  7200
"#
    ).unwrap();

    println!("{:?}", value);

    let frob: Frob = serde_yaml::from_str(
        r#"
---
"foo": !!int |-
  7200
"#
    ).unwrap();

    println!("{:?}", frob);
    println!("frob.foo = {}", frob.foo);
}