diff --git a/src/lib.rs b/src/lib.rs
index 2af1005..0141070 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -51,7 +51,7 @@ mod green;
 #[allow(unsafe_code)]
 mod syntax;
 
-#[cfg(feature = "serde1")]
+#[cfg(feature = "serialize")]
 mod serde_impls;
 #[allow(missing_docs)]
 mod utility_types;
diff --git a/src/syntax/iter.rs b/src/syntax/iter.rs
new file mode 100644
index 0000000..645b709
--- /dev/null
+++ b/src/syntax/iter.rs
@@ -0,0 +1,164 @@
+//! Red tree iterators.
+
+use std::iter::FusedIterator;
+
+use text_size::TextSize;
+
+use crate::{green::GreenElementRef, GreenNodeChildren, Language, SyntaxElementRef, SyntaxNode};
+
+#[derive(Clone, Debug)]
+struct Iter<'n> {
+    green:  GreenNodeChildren<'n>,
+    offset: TextSize,
+    index:  usize,
+}
+
+impl<'n> Iter<'n> {
+    fn new<L: Language, D>(parent: &'n SyntaxNode<L, D>) -> Self {
+        let offset = parent.text_range().start();
+        let green: GreenNodeChildren<'_> = parent.green().children();
+        Iter {
+            green,
+            offset,
+            index: 0,
+        }
+    }
+}
+
+impl<'n> Iterator for Iter<'n> {
+    type Item = (GreenElementRef<'n>, usize, TextSize);
+
+    #[inline(always)]
+    fn next(&mut self) -> Option<Self::Item> {
+        self.green.next().map(|element| {
+            let offset = self.offset;
+            let index = self.index;
+            self.offset += element.text_len();
+            self.index += 1;
+            (element, index, offset)
+        })
+    }
+
+    #[inline(always)]
+    fn size_hint(&self) -> (usize, Option<usize>) {
+        self.green.size_hint()
+    }
+
+    #[inline(always)]
+    fn count(self) -> usize
+    where
+        Self: Sized,
+    {
+        self.green.count()
+    }
+}
+
+impl<'n> ExactSizeIterator for Iter<'n> {
+    #[inline(always)]
+    fn len(&self) -> usize {
+        self.green.len()
+    }
+}
+impl<'n> FusedIterator for Iter<'n> {}
+
+/// An iterator over the child nodes of a [`SyntaxNode`].
+#[derive(Clone, Debug)]
+pub struct SyntaxNodeChildren<'n, L: Language, D: 'static = ()> {
+    inner:  Iter<'n>,
+    parent: &'n SyntaxNode<L, D>,
+}
+
+impl<'n, L: Language, D> SyntaxNodeChildren<'n, L, D> {
+    #[inline]
+    pub(super) fn new(parent: &'n SyntaxNode<L, D>) -> Self {
+        Self {
+            inner: Iter::new(parent),
+            parent,
+        }
+    }
+}
+
+impl<'n, L: Language, D> Iterator for SyntaxNodeChildren<'n, L, D> {
+    type Item = &'n SyntaxNode<L, D>;
+
+    #[inline(always)]
+    fn next(&mut self) -> Option<Self::Item> {
+        for (element, index, offset) in &mut self.inner {
+            if let Some(&node) = element.as_node() {
+                return Some(self.parent.get_or_add_node(node, index, offset).as_node().unwrap());
+            }
+        }
+        None
+    }
+
+    #[inline(always)]
+    fn size_hint(&self) -> (usize, Option<usize>) {
+        self.inner.size_hint()
+    }
+
+    #[inline(always)]
+    fn count(self) -> usize
+    where
+        Self: Sized,
+    {
+        self.inner.count()
+    }
+}
+
+impl<'n, L: Language, D> ExactSizeIterator for SyntaxNodeChildren<'n, L, D> {
+    #[inline(always)]
+    fn len(&self) -> usize {
+        self.inner.len()
+    }
+}
+impl<'n, L: Language, D> FusedIterator for SyntaxNodeChildren<'n, L, D> {}
+
+/// An iterator over the children of a [`SyntaxNode`].
+#[derive(Clone, Debug)]
+pub struct SyntaxElementChildren<'n, L: Language, D: 'static = ()> {
+    inner:  Iter<'n>,
+    parent: &'n SyntaxNode<L, D>,
+}
+
+impl<'n, L: Language, D> SyntaxElementChildren<'n, L, D> {
+    #[inline]
+    pub(super) fn new(parent: &'n SyntaxNode<L, D>) -> Self {
+        Self {
+            inner: Iter::new(parent),
+            parent,
+        }
+    }
+}
+
+impl<'n, L: Language, D> Iterator for SyntaxElementChildren<'n, L, D> {
+    type Item = SyntaxElementRef<'n, L, D>;
+
+    #[inline(always)]
+    fn next(&mut self) -> Option<Self::Item> {
+        let parent = self.parent;
+        self.inner
+            .next()
+            .map(|(green, index, offset)| parent.get_or_add_element(green, index, offset))
+    }
+
+    #[inline(always)]
+    fn size_hint(&self) -> (usize, Option<usize>) {
+        self.inner.size_hint()
+    }
+
+    #[inline(always)]
+    fn count(self) -> usize
+    where
+        Self: Sized,
+    {
+        self.inner.count()
+    }
+}
+
+impl<'n, L: Language, D> ExactSizeIterator for SyntaxElementChildren<'n, L, D> {
+    #[inline(always)]
+    fn len(&self) -> usize {
+        self.inner.len()
+    }
+}
+impl<'n, L: Language, D> FusedIterator for SyntaxElementChildren<'n, L, D> {}
diff --git a/src/syntax/mod.rs b/src/syntax/mod.rs
index 08fbbd4..df6e19a 100644
--- a/src/syntax/mod.rs
+++ b/src/syntax/mod.rs
@@ -8,11 +8,13 @@
 mod element;
 pub use element::{SyntaxElement, SyntaxElementRef};
 mod node;
-pub use node::{SyntaxElementChildren, SyntaxNode, SyntaxNodeChildren};
+pub use node::SyntaxNode;
 mod token;
 pub use token::SyntaxToken;
 mod resolved;
 pub use resolved::{ResolvedElement, ResolvedElementRef, ResolvedNode, ResolvedToken};
+mod iter;
+pub use iter::{SyntaxElementChildren, SyntaxNodeChildren};
 
 mod text;
 pub use text::SyntaxText;
diff --git a/src/syntax/node.rs b/src/syntax/node.rs
index 247c402..a4c0ee6 100644
--- a/src/syntax/node.rs
+++ b/src/syntax/node.rs
@@ -1,5 +1,5 @@
 use super::*;
-#[cfg(feature = "serde1")]
+#[cfg(feature = "serialize")]
 use crate::serde_impls::{SerializeWithData, SerializeWithResolver};
 use crate::{
     green::{GreenElementRef, SyntaxKind},
@@ -507,7 +507,12 @@ impl<L: Language, D> SyntaxNode<L, D> {
     }
 
     #[inline(always)]
-    fn get_or_add_node(&self, node: &GreenNode, index: usize, offset: TextSize) -> SyntaxElementRef<'_, L, D> {
+    pub(super) fn get_or_add_node(
+        &self,
+        node: &GreenNode,
+        index: usize,
+        offset: TextSize,
+    ) -> SyntaxElementRef<'_, L, D> {
         if let Some(elem) = self.read(index) {
             debug_assert_eq!(elem.text_range().start(), offset);
             return elem;
@@ -520,7 +525,7 @@ impl<L: Language, D> SyntaxNode<L, D> {
     }
 
     #[inline(always)]
-    fn get_or_add_element(
+    pub(super) fn get_or_add_element(
         &self,
         element: GreenElementRef<'_>,
         index: usize,
@@ -946,7 +951,7 @@ impl<L: Language, D> SyntaxNode<L, D> {
     }
 }
 
-#[cfg(feature = "serde1")]
+#[cfg(feature = "serialize")]
 impl<L, D> SyntaxNode<L, D>
 where
     L: Language,
@@ -973,96 +978,6 @@ where
     }
 }
 
-#[derive(Clone, Debug)]
-struct Iter<'n> {
-    green:  GreenNodeChildren<'n>,
-    offset: TextSize,
-    index:  usize,
-}
-
-impl<'n> Iter<'n> {
-    fn new<L: Language, D>(parent: &'n SyntaxNode<L, D>) -> Self {
-        let offset = parent.text_range().start();
-        let green: GreenNodeChildren<'_> = parent.green().children();
-        Iter {
-            green,
-            offset,
-            index: 0,
-        }
-    }
-
-    #[inline(always)]
-    fn next(&mut self) -> Option<(GreenElementRef, usize, TextSize)> {
-        self.green.next().map(|element| {
-            let offset = self.offset;
-            let index = self.index;
-            self.offset += element.text_len();
-            self.index += 1;
-            (element, index, offset)
-        })
-    }
-}
-
-/// An iterator over the child nodes of a [`SyntaxNode`].
-#[derive(Clone, Debug)]
-pub struct SyntaxNodeChildren<'n, L: Language, D: 'static = ()> {
-    inner:  Iter<'n>,
-    parent: &'n SyntaxNode<L, D>,
-}
-
-impl<'n, L: Language, D> SyntaxNodeChildren<'n, L, D> {
-    #[inline]
-    fn new(parent: &'n SyntaxNode<L, D>) -> Self {
-        Self {
-            inner: Iter::new(parent),
-            parent,
-        }
-    }
-}
-
-impl<'n, L: Language, D> Iterator for SyntaxNodeChildren<'n, L, D> {
-    type Item = &'n SyntaxNode<L, D>;
-
-    #[inline(always)]
-    fn next(&mut self) -> Option<Self::Item> {
-        while let Some((element, index, offset)) = self.inner.next() {
-            if let Some(&node) = element.as_node() {
-                return Some(self.parent.get_or_add_node(node, index, offset).as_node().unwrap());
-            }
-        }
-        None
-    }
-}
-
-/// An iterator over the children of a [`SyntaxNode`].
-#[derive(Clone, Debug)]
-pub struct SyntaxElementChildren<'n, L: Language, D: 'static = ()> {
-    inner:  Iter<'n>,
-    parent: &'n SyntaxNode<L, D>,
-}
-
-impl<'n, L: Language, D> SyntaxElementChildren<'n, L, D> {
-    #[inline]
-    fn new(parent: &'n SyntaxNode<L, D>) -> Self {
-        Self {
-            inner: Iter::new(parent),
-            parent,
-        }
-    }
-}
-
-impl<'n, L: Language, D> Iterator for SyntaxElementChildren<'n, L, D> {
-    type Item = SyntaxElementRef<'n, L, D>;
-
-    #[inline(always)]
-    fn next(&mut self) -> Option<Self::Item> {
-        let parent = self.parent;
-        self.inner
-            .next()
-            .map(|(green, index, offset)| parent.get_or_add_element(green, index, offset))
-    }
-}
-
 impl GreenNode {
     #[inline(always)]
     fn children_from(
diff --git a/src/syntax/resolved.rs b/src/syntax/resolved.rs
index 67c6841..906db69 100644
--- a/src/syntax/resolved.rs
+++ b/src/syntax/resolved.rs
@@ -214,7 +214,7 @@ impl<L: Language, D> fmt::Display for ResolvedToken<L, D> {
     }
 }
 
-#[cfg(feature = "serde1")]
+#[cfg(feature = "serialize")]
 impl<L, D> ResolvedNode<L, D>
 where
     L: Language,
diff --git a/tests/it/main.rs b/tests/it/main.rs
index ac5df88..4c9511e 100644
--- a/tests/it/main.rs
+++ b/tests/it/main.rs
@@ -1,7 +1,7 @@
 mod basic;
 mod regressions;
 mod sendsync;
-#[cfg(feature = "serde1")]
+#[cfg(feature = "serialize")]
 mod serde;
 
 use cstree::{GreenNode, GreenNodeBuilder, Language, NodeCache, SyntaxKind};
diff --git a/tests/it/serde.rs b/tests/it/serde.rs
index e6625ff..1ca9183 100644
--- a/tests/it/serde.rs
+++ b/tests/it/serde.rs
@@ -2,7 +2,7 @@ use crate::{build_recursive, build_tree_with_cache, ResolvedNode};
 
 use super::{Element, SyntaxNode};
 use cstree::{
-    interning::{IntoResolver, Rodeo},
+    interning::{new_interner, IntoResolver},
     GreenNodeBuilder, NodeCache, NodeOrToken,
 };
 use serde_test::Token;
@@ -238,7 +238,7 @@ fn attach_data(node: &SyntaxNode<String>) {
 
 #[test]
 fn serialize_tree_with_data_with_resolver() {
-    let mut interner = Rodeo::with_hasher(Default::default());
+    let mut interner = new_interner();
     let mut cache = NodeCache::with_interner(&mut interner);
 
     let root = three_level_tree();
@@ -256,7 +256,7 @@ fn serialize_tree_with_data_with_resolver() {
 
 #[test]
 fn serialize_tree_with_resolver() {
-    let mut interner = Rodeo::with_hasher(Default::default());
+    let mut interner = new_interner();
     let mut cache = NodeCache::with_interner(&mut interner);
 
     let root = three_level_tree();