title: Binary operator '+=' connot be applied to operands of type '[Any]' and '[Int]'
body: <p>Why can't I append <code>testArray2</code>? I got the error <strong>Binary operator '+=' connot be applied to operands of type '[Any]' and '[Int]'</strong> when I did this:</p>
  
  <pre><code>var testArray : [Any] = [10,20,45,32]
  var testArray2 : [Int] = [10,20,45,32]
  var someArray : [Any] = []
  someArray += testArray
  someArray += testArray2
  </code></pre>