title: Argument of type 'number' is not assignable to parameter of type 'string'
body: <p>I was trying to set <code>UNIX</code> time in local storage by:</p>
  
  <pre><code>let dt: number = Date.now();
  localStorage.setItem('logged', dt+864000000);
  </code></pre>
  
  <blockquote>
    <p><strong>Returning with error:</strong> Argument of type 'number' is not assignable to parameter of type
    'string'</p>
  </blockquote>
  
  <p>It's giving the same error when i use <code>getItem</code> to read the <code>logged</code> data.</p>
  
  <p>Any solution?</p>