struct Compact<T>(T);

impl<T> From<T> for Compact<T> {
    fn from(t: T) -> Self {
        Compact(t)
    }
}

impl<T> Into<T> for Compact<T> {
    fn into(self) -> T {
        self.0
    }
}

impl<T> From<Compact<T>> for T {
    fn from(c: Compact<T>) -> Self {
        c.0
    }
}