--- a/src/mapping.rs Wed Sep 03 19:55:05 2025 -0500 +++ b/src/mapping.rs Wed Sep 03 20:19:41 2025 -0500 @@ -283,7 +283,7 @@ // } self.outer - .differential_impl(x.eval_ref_decompose(|r| self.inner.apply(r))) + .differential_impl(x.eval_ref(|r| self.inner.apply(r))) * self.inner.differential_impl(x) } }