pub fn print_object<'a, V, I: IntoIterator<Item = (&'a str, V)>>(
    entries: I,
    f: &mut Formatter<'_>,
    options: &Options,
    indent: usize,
    sizes: &[Size],
    index: &mut usize
) -> Resultwhere
    I::IntoIter: ExactSizeIterator,
    V: PrintWithSize,