通过泛型格式化为整数的Rust浮点

我有以下Rust代码:

#[derive(Debug)]
struct Point<T, U> {
    x: T,
    y: U
}

impl<T: std::fmt::Display, U: std::fmt::Display> Point<T, U> {
    fn print(&self) {
        println!("{} {}", &self.x, &self.y );
    }
}

impl<X1, Y1> Point<X1, Y1> {
    fn mixup<X2, Y2>(self, other: Point<X2, Y2>) -> Point<X1, Y2> {
        Point {
            x: self.x,
            y: other.y,
        }
    }
}

fn main() {
    let integer = Point {x: 1, y:2};
    let float = Point{x: 2.0, y:3.0};

    let floaty = integer.mixup(float);

    println!("{:?}", floaty); // output: Point { x: 1, y: 3.0 } - OK
    floaty.print(); // output: 1 3 - NOT OK
}

为什么 floaty.print() 胁迫 3.0 到 3 ? 如何 print 方法实现了吗?