title: unzip task overwrites target files
body: <pre><code>http://ant.apache.org/manual/Tasks/unzip.html - Unzip takes overwrites target files even when overwrite is given as false. What would be the problem here?
  
  &lt;unzip src="MathJax.zip" dest="${appserver.deploy}/ROOT.war" overwrite="false"/&gt;
  </code></pre>
  
  <p>appserver.deploy - points to the appserver deploy folder.</p>