v8/test/mjsunit/json-replacer-number-wrapper-tostring.js

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// 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.i
var calls = 0;
var num = new Number;
num.toString = function() {
calls++;
return '';
};
num.valueOf = function() {
assertUnreachable();
};
JSON.stringify('', [num]);
assertEquals(1, calls);