diff --git a/packages/core-js/internals/array-sort.js b/packages/core-js/internals/array-sort.js
index c815d7ce3158..876c93296176 100644
--- a/packages/core-js/internals/array-sort.js
+++ b/packages/core-js/internals/array-sort.js
@@ -1,4 +1,4 @@
-'use strict';
+// TODO: use something more complex like timsort?
 var floor = Math.floor;
 
 var mergeSort = function (array, comparefn) {
diff --git a/packages/core-js/modules/es.array.sort.js b/packages/core-js/modules/es.array.sort.js
index 551a5a1bd8b6..ce7296a51380 100644
--- a/packages/core-js/modules/es.array.sort.js
+++ b/packages/core-js/modules/es.array.sort.js
@@ -89,7 +89,6 @@ $({ target: 'Array', proto: true, forced: FORCED }, {
       if (index in array) items.push(array[index]);
     }
 
-    // TODO: use something more complex like timsort?
     items = internalSort(items, getSortCompare(comparefn));
     itemsLength = items.length;
     index = 0;
diff --git a/tests/pure/es.array.sort.js b/tests/pure/es.array.sort.js
index ac560ef946e0..e0dbf62f4e18 100644
--- a/tests/pure/es.array.sort.js
+++ b/tests/pure/es.array.sort.js
@@ -10,6 +10,7 @@ QUnit.test('Array#sort', assert => {
 
   assert.deepEqual(sort([1, 3, 2]), [1, 2, 3], '#1');
   assert.deepEqual(sort([1, 3, 2, 11]), [1, 11, 2, 3], '#2');
+  assert.deepEqual(sort([1, -1, 3, NaN, 2, 0, 11, -0]), [-1, 0, -0, 1, 11, 2, 3, NaN], '#3');
 
   let array = Array(5);
   array[0] = 1;
diff --git a/tests/tests/es.array.sort.js b/tests/tests/es.array.sort.js
index 3ec67369a92d..f2195f0b5afe 100644
--- a/tests/tests/es.array.sort.js
+++ b/tests/tests/es.array.sort.js
@@ -10,6 +10,7 @@ QUnit.test('Array#sort', assert => {
 
   assert.deepEqual([1, 3, 2].sort(), [1, 2, 3], '#1');
   assert.deepEqual([1, 3, 2, 11].sort(), [1, 11, 2, 3], '#2');
+  assert.deepEqual([1, -1, 3, NaN, 2, 0, 11, -0].sort(), [-1, 0, -0, 1, 11, 2, 3, NaN], '#1');
 
   let array = Array(5);
   array[0] = 1;
diff --git a/tests/tests/es.typed-array.sort.js b/tests/tests/es.typed-array.sort.js
index 2ab504c45cbc..d7088b6c0c87 100644
--- a/tests/tests/es.typed-array.sort.js
+++ b/tests/tests/es.typed-array.sort.js
@@ -11,6 +11,7 @@ if (DESCRIPTORS) QUnit.test('%TypedArrayPrototype%.sort', assert => {
     assert.looksNative(sort, `${ name }::sort looks native`);
 
     if (name.indexOf('Float') === 0) {
+      assert.deepEqual(new TypedArray([1, -1, 3, NaN, 2, 0, 11, -0]).sort(), new TypedArray([-1, -0, 0, 1, 2, 3, 11, NaN]), '#1');
       assert.ok(1 / new TypedArray([0, -0]).sort()[0] < 0, '-0');
       assert.deepEqual(new TypedArray([NaN, 1, NaN]).sort(), new TypedArray([1, NaN, NaN]), 'NaN');
     }