diff -r 03f34ba55685 -r 45d03cf92c23 src/direct_product.rs
--- a/src/direct_product.rs	Mon Sep 01 23:08:27 2025 -0500
+++ b/src/direct_product.rs	Tue Sep 02 00:05:29 2025 -0500
@@ -392,6 +392,8 @@
     D: Decomposition<A>,
     Q: Decomposition<B>,
 {
+    type OwnedInstance = Pair<D::OwnedInstance, Q::OwnedInstance>;
+
     type Decomposition<'b>
         = Pair<D::Decomposition<'b>, Q::Decomposition<'b>>
     where
@@ -441,7 +443,7 @@
     }
 
     #[inline]
-    fn cow<'b>(self) -> MyCow<'b, Pair<A, B>>
+    fn cow<'b>(self) -> MyCow<'b, Pair<D::OwnedInstance, Q::OwnedInstance>>
     where
         Self: 'b,
     {
@@ -449,7 +451,7 @@
     }
 
     #[inline]
-    fn own(self) -> Pair<A, B> {
+    fn own(self) -> Pair<D::OwnedInstance, Q::OwnedInstance> {
         Pair(self.0.own(), self.1.own())
     }
 }
@@ -492,7 +494,7 @@
     }
 
     #[inline]
-    fn cow<'b>(self) -> MyCow<'b, Pair<A, B>>
+    fn cow<'b>(self) -> MyCow<'b, Pair<D::OwnedInstance, Q::OwnedInstance>>
     where
         Self: 'b,
     {
@@ -500,7 +502,7 @@
     }
 
     #[inline]
-    fn own(self) -> Pair<A, B> {
+    fn own(self) -> Pair<D::OwnedInstance, Q::OwnedInstance> {
         let Pair(ref u, ref v) = self;
         Pair(u.own(), v.own())
     }