Method write_usize

perro_source/core/perro_csv/src/lib.rs:30–32

(&mut self, i: usize)

    fn rows(&self) -> impl Iterator<Item = usize> + '_ {
        std::iter::once(self.first).chain(self.collisions.iter().copied())
    }
}

#[derive(Default)]
struct U64IdentityHasher(u64);