//! Spline [`Iterator`], in a nutshell.
//!
//! You can iterate over a [`Spline<K, V>`]’s keys with the [`IntoIterator`] trait on
//! `&Spline<K, V>`. This gives you iterated [`Key<K, V>`] keys.
//!
//! [`Spline<K, V>`]: crate::spline::Spline
//! [`Key<K, V>`]: crate::key::Key
use crate::;
/// Iterator over spline keys.
///
/// This iterator type is guaranteed to iterate over sorted keys.