Change compareArray to allow new property

Change the compareArray to code which allow new property but still assert the actual output contains the expected and assert the order.

test/intl402/DateTimeFormat/prototype/resolvedOptions/order-fractionalSecondDigits.js

@@ -4,7 +4,7 @@
 /*---
 esid: sec-intl.datetimeformat.prototype.resolvedoptions
 description: Verifies the property order for the object returned by resolvedOptions().
-includes: [compareArray.js]
+includes: [arrayContains.js]
 features: [Intl.DateTimeFormat-fractionalSecondDigits]
 ---*/
 
@@ -24,4 +24,12 @@ const expected = [
   "fractionalSecondDigits",
 ];
 
-assert.compareArray(Object.getOwnPropertyNames(options), expected);
+let actual = Object.getOwnPropertyNames(options);
+
+// Ensure all expected items are in actual and also allow other property
+// implemented in other new proposal.
+assert(arrayContains(actual, expected));
+for (var i = 1; i < expected.length; i++) {
+  // Ensure the order as expected but allow additional new property in between
+  assert(actual.indexOf(expected[i-1]) < actual.indexOf(expected[i]));
+}