From 45b83ebbb397a87a5d2893c08de3617870fb3746 Mon Sep 17 00:00:00 2001
From: daishi <daishi@axlight.com>
Date: Wed, 16 Oct 2024 10:02:53 +0900
Subject: [PATCH 1/2] add failing test

---
 tests/vanilla/shallow.test.tsx | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tests/vanilla/shallow.test.tsx b/tests/vanilla/shallow.test.tsx
index 07f0561ed5..481aa6b109 100644
--- a/tests/vanilla/shallow.test.tsx
+++ b/tests/vanilla/shallow.test.tsx
@@ -97,6 +97,11 @@ describe('shallow', () => {
     const b = new URLSearchParams({ zustand: 'shallow' })
     expect(shallow(a, b)).toBe(false)
   })
+
+  it('should work with nested arrays (#2794)', () => {
+    const arr = [1, 2]
+    expect(shallow([arr, 1], [arr, 1])).toBe(true)
+  })
 })
 
 describe('unsupported cases', () => {

From a5496d7a6d12a4b11d46bc3ce42c108d8c339c19 Mon Sep 17 00:00:00 2001
From: daishi <daishi@axlight.com>
Date: Wed, 16 Oct 2024 10:06:22 +0900
Subject: [PATCH 2/2] add a fallback

---
 src/vanilla/shallow.ts | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/src/vanilla/shallow.ts b/src/vanilla/shallow.ts
index 84b1c42d2f..3f35ec50b6 100644
--- a/src/vanilla/shallow.ts
+++ b/src/vanilla/shallow.ts
@@ -40,10 +40,14 @@ export function shallow<T>(objA: T, objB: T): boolean {
       nextA.value.length === 2 &&
       nextB.value.length === 2
     ) {
-      return compareMapLike(
-        objA as Iterable<[unknown, unknown]>,
-        objB as Iterable<[unknown, unknown]>,
-      )
+      try {
+        return compareMapLike(
+          objA as Iterable<[unknown, unknown]>,
+          objB as Iterable<[unknown, unknown]>,
+        )
+      } catch {
+        // fallback
+      }
     }
     while (!nextA.done && !nextB.done) {
       if (!Object.is(nextA.value, nextB.value)) {