Rust's float parser has correctness issues

rust-wtf.rs

fn main() {
    // Ok(0.000000000...0000000005)
    println!("{:?}", "4.9406564584124654e-324".parse::<f64>());

    // WTF???
    // Err(ParseFloatError { kind: Invalid })
    println!("{:?}", "4.94065645841246545e-324".parse::<f64>());

    // Ok(0.000000000...0000000005)
    println!("{:?}", "4.9406564584124655e-324".parse::<f64>());
}