Fix JSON issue with arrays.

test/mjsunit/json.js

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 238 matching lines @@
 assertEquals("[\n^1,\n^2,\n^3\n]", JSON.stringify([1, 2, 3], null, "^"));
 assertEquals("[\n^1,\n^2,\n^3\n]",
              JSON.stringify([1, 2, 3], null, new String("^")));
 assertEquals("[\n 1,\n 2,\n [\n  3,\n  [\n   4\n  ],\n  5\n ],\n 6,\n 7\n]",
              JSON.stringify([1, 2, [3, [4], 5], 6, 7], null, 1));
 assertEquals("[]", JSON.stringify([], null, 1));
 assertEquals("[1,2,[3,[4],5],6,7]",
              JSON.stringify([1, 2, [3, [4], 5], 6, 7], null));
 assertEquals("[2,4,[6,[8],10],12,14]",
              JSON.stringify([1, 2, [3, [4], 5], 6, 7], DoubleNumbers));
+assertEquals('["a","ab","abc"]', JSON.stringify(["a","ab","abc"]));
 
 var circular = [1, 2, 3];
 circular[2] = circular;
 assertThrows(function () { JSON.stringify(circular); }, TypeError);
 
 var singleton = [];
 var multiOccurrence = [singleton, singleton, singleton];
 assertEquals("[[],[],[]]", JSON.stringify(multiOccurrence));
 
 assertEquals('{"x":5,"y":6}', JSON.stringify({x:5,y:6}));
@@ skipping 153 matching lines @@
 //
 // Parse a non-object value as __proto__. This must not create a
 // __proto__ property different from the original, and should not
 // change the original.
 var o = JSON.parse('{"__proto__":5}');
 assertEquals(Object.prototype, o.__proto__);  // __proto__ isn't changed.
 assertEquals(0, Object.keys(o).length);  // __proto__ isn't added as enumerable.