comparison of +0 and -0 gives wrong result

[tspiteri]

extern crate half;
use half::f16;
fn main() {
    let plus32 = 0f32;
    let minus32 = -plus32;
    let plus16 = f16::from_f32(plus32);
    let minus16 = f16::from_f32(minus32);
    println!("plus32 == minus32 -> {}", plus32 == minus32);
    println!("plus16 == minus16 -> {}", plus16 == minus16);
    println!("plus32.partial_cmp(&minus32) -> {:?}", plus32.partial_cmp(&minus32));
    println!("plus16.partial_cmp(&minus16) -> {:?}", plus16.partial_cmp(&minus16));
}

Output:

plus32 == minus32 -> true
plus16 == minus16 -> false
plus32.partial_cmp(&minus32) -> Some(Equal)
plus16.partial_cmp(&minus16) -> Some(Less)

[tspiteri]

Also, partial_cmp incorrectly just compares the inner u16, so all positive numbers are treated as less than all negative numbers.