diff --git a/crates/fayalite/src/intern.rs b/crates/fayalite/src/intern.rs
index 3780ad3..a8f7fc0 100644
--- a/crates/fayalite/src/intern.rs
+++ b/crates/fayalite/src/intern.rs
@@ -3,7 +3,7 @@
 #![allow(clippy::type_complexity)]
 use crate::intern::type_map::TypeIdMap;
 use bitvec::{ptr::BitPtr, slice::BitSlice, vec::BitVec};
-use hashbrown::{hash_map::RawEntryMut, HashMap, HashTable};
+use hashbrown::{HashTable, hash_map::DefaultHashBuilder as DefaultBuildHasher};
 use serde::{Deserialize, Serialize};
 use std::{
     any::{Any, TypeId},
@@ -17,7 +17,7 @@ use std::{
     sync::{Mutex, RwLock},
 };
 
-pub mod type_map;
+mod type_map;
 
 pub trait LazyInternedTrait<T: ?Sized + Send + Sync + 'static>: Send + Sync + Any {
     fn get(&self) -> Interned<T>;
@@ -316,8 +316,13 @@ pub trait Intern: Any + Send + Sync {
     }
 }
 
+struct InternerState<T: ?Sized + 'static + Send + Sync> {
+    table: HashTable<&'static T>,
+    hasher: DefaultBuildHasher,
+}
+
 pub struct Interner<T: ?Sized + 'static + Send + Sync> {
-    map: Mutex<HashMap<&'static T, ()>>,
+    state: Mutex<InternerState<T>>,
 }
 
 impl<T: ?Sized + 'static + Send + Sync> Interner<T> {
@@ -330,7 +335,10 @@ impl<T: ?Sized + 'static + Send + Sync> Interner<T> {
 impl<T: ?Sized + 'static + Send + Sync> Default for Interner<T> {
     fn default() -> Self {
         Self {
-            map: Default::default(),
+            state: Mutex::new(InternerState {
+                table: HashTable::new(),
+                hasher: Default::default(),
+            }),
         }
     }
 }
@@ -341,17 +349,16 @@ impl<T: ?Sized + 'static + Send + Sync + Hash + Eq + ToOwned> Interner<T> {
         alloc: F,
         value: Cow<'_, T>,
     ) -> Interned<T> {
-        let mut map = self.map.lock().unwrap();
-        let hasher = map.hasher().clone();
-        let hash = hasher.hash_one(&*value);
-        let inner = match map.raw_entry_mut().from_hash(hash, |k| **k == *value) {
-            RawEntryMut::Occupied(entry) => *entry.key(),
-            RawEntryMut::Vacant(entry) => {
-                *entry
-                    .insert_with_hasher(hash, alloc(value), (), |k| hasher.hash_one(&**k))
-                    .0
-            }
-        };
+        let mut state = self.state.lock().unwrap();
+        let InternerState { table, hasher } = &mut *state;
+        let inner = *table
+            .entry(
+                hasher.hash_one(&*value),
+                |k| **k == *value,
+                |k| hasher.hash_one(&**k),
+            )
+            .or_insert_with(|| alloc(value))
+            .get();
         Interned { inner }
     }
 }
@@ -742,7 +749,7 @@ pub trait MemoizeGeneric: 'static + Send + Sync + Hash + Eq + Copy {
     fn get_cow(self, input: Self::InputCow<'_>) -> Self::Output {
         static TYPE_ID_MAP: TypeIdMap = TypeIdMap::new();
         let map: &RwLock<(
-            hashbrown::hash_map::DefaultHashBuilder,
+            DefaultBuildHasher,
             HashTable<(Self, Self::InputOwned, Self::Output)>,
         )> = TYPE_ID_MAP.get_or_insert_default();
         fn hash_eq_key<'a, 'b, T: MemoizeGeneric>(