title: What does :?> mean in f#?
body: <p>Given the line:</p>
  
  <pre><code>let win = XamlReader.Parse(xaml) :?&gt; Window
  </code></pre>
  
  <p>What is <code>:?&gt;</code> doing? </p>
  
  <p>I tried looking up ternary but not noticing the <code>:?</code>, it seems to be for type testing?. Also I know <code>&gt;</code> is piping but Window does not  have any constructor parameters.</p>