ES6: Unscopable should use ToBoolean

test/mjsunit/es6/unscopables.js

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 var global = this;
 var globalProto = Object.getPrototypeOf(global);
 
 // Number of objects being tested. There is an assert ensuring this is correct.
 var objectCount = 21;
 
@@ skipping 112 matching lines @@
   var z = 3;
   object.x = 4;
   object.y = 5;
 
   with (object) {
     assertEquals(4, x);
     assertEquals(5, y);
     assertEquals(3, z);
   }
 
-  object[Symbol.unscopables] = {x: true};
-  with (object) {
-    assertEquals(1, x);
-    assertEquals(5, y);
-    assertEquals(3, z);
+  var truthyValues = [true, 1, 'x', {}, Symbol()];
+  for (var truthyValue of truthyValues) {
+    object[Symbol.unscopables] = {x: truthyValue};
+    with (object) {
+      assertEquals(1, x);
+      assertEquals(5, y);
+      assertEquals(3, z);
+    }
   }
 
-  object[Symbol.unscopables] = {x: 0, y: true};
-  with (object) {
-    assertEquals(1, x);
-    assertEquals(2, y);
-    assertEquals(3, z);
+  var falsyValues = [false, 0, -0, NaN, '', null, undefined];
+  for (var falsyValue of falsyValues) {
+    object[Symbol.unscopables] = {x: falsyValue, y: true};
+    with (object) {
+      assertEquals(4, x);
+      assertEquals(2, y);
+      assertEquals(3, z);
+    }
   }
 
-  object[Symbol.unscopables] = {x: 0, y: undefined};
-  with (object) {
-    assertEquals(1, x);
-    assertEquals(5, y);
-    assertEquals(3, z);
+  for (var xFalsy of falsyValues) {
+    for (var yFalsy of falsyValues) {
+      object[Symbol.unscopables] = {x: xFalsy, y: yFalsy};
+      with (object) {
+        assertEquals(4, x);
+        assertEquals(5, y);
+        assertEquals(3, z);
+      }
+    }
   }
 }
 runTest(TestBasics);
 
 
 function TestUnscopableChain(object) {
   var x = 1;
   object.x = 2;
 
   with (object) {
@@ skipping 552 matching lines @@
       throw new CustomError();
     }
   };
   assertThrows(function() {
     with (object) {
       x;
     }
   }, CustomError);
 }
 TestGetUnscopablesGetterThrows();