title: Integer variable change values in javascript
body: <p>After testing i found an behavior not sure what everyone else does.</p>
  <p>I have an id 002006556 its a int, but when I do the following code it changes the number, Is there a reason why?</p>
  <p>Here is the jsFiddle</p>
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>var user = 002006556;
  alert(user.toString());
  alert(user);</code></pre>
  </div>
  </div>
  </p>
  <p>It cannot be in string because the real code come from a site platforme and the true values would <code>var user = {Username};</code>
  The result is not what i am expecting</p>