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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
</body>
</html>
 
window.addEventListener("load", function ()
{
  function buggy() {
    var a = [];
    a.push(1);
    a.push(2);
    return String(a) === String(a.reverse());
  }
  alert(buggy() ? '문제 있음' : '괜찮음');
});
    
Output

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