Method swap

src/pal.rs:309–312

(&mut self, a: usize, b: usize)

    #[cfg_attr(debug_assertions, track_caller)]
    pub(crate) fn swap(&mut self, a: usize, b: usize) {
        self.colors.swap(a, b);
        self.pops.swap(a, b);
    }

    /// Also rounds the input pal
    pub(crate) fn init_int_palette(&mut self, int_palette: &mut Palette, gamma: f64, posterize: u8) {