num::rationals rounding method is incorrect

[libfud]

extern crate num;

use num::rational::BigRational;

fn main() {
    let x = from_str::<BigRational>("2/5").unwrap();
    println!("{}, {}", x, x.round());
}

Prints "2/5, 1".

The method is written here:
http://static.rust-lang.org/doc/master/src/num/home/rustbuild/src/rust-buildbot/slave/nightly-linux/build/src/libnum/rational.rs.html#138-140

pub fn round(&self) -> Ratio<T> {
    if *self < Zero::zero() {
        Ratio::from_integer((self.numer - self.denom + One::one()) / self.denom)
    } else {
        Ratio::from_integer((self.numer + self.denom - One::one()) / self.denom)
    }
}

[jbcrail]

The rounding error was fixed by #16778. This issue can be closed.

[alexcrichton]

Thanks @jbcrail!