Use SameValue

harness/compareArray.js

@@ -5,13 +5,20 @@ description: |
     Compare the contents of two arrays
 ---*/
 
+function isSameValue(a, b) {
+  if (a === 0 && b === 0) return 1 / a === 1 / b;
+  if (a !== a && b !== b) return true;
+
+  return a === b;
+}
+
 function compareArray(a, b) {
   if (b.length !== a.length) {
     return false;
   }
 
   for (var i = 0; i < a.length; i++) {
-    if (b[i] !== a[i]) {
+    if (!isSameValue(b[i], a[i])) {
       return false;
     }
   }

test/harness/compare-array-samevalue.js

@@ -0,0 +1,11 @@
+// Copyright (C) 2019 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+  compareArray uses SameValue for value comparison.
+includes: [compareArray.js]
+---*/
+
+assert(compareArray([NaN], [NaN]));
+assert(!compareArray([0], [-0]));