// Copyright 2015 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.// http://ecma-international.org/ecma-262/6.0/#sec-json.stringify// Step 4.b.iii.5.f.ivarcalls=0;varnum=newNumber;num.toString=function(){calls++;return'';};num.valueOf=function(){assertUnreachable();};JSON.stringify('',[num]);assertEquals(1,calls);