title: How to cast from UInt16 to NSNumber
body: <p>I have a UInt16 variable that I would like to pass to a legacy function that requires an NSNumber.</p>
  
  <p>If I try:</p>
  
  <pre><code>var castAsNSNumber : NSNumber = myUInt16
  </code></pre>
  
  <p>I get a compiler error <code>'UInt16' is not convertible to 'NSNumber'</code></p>
  
  <h2>Question</h2>
  
  <p>How can I recast this as an NSNumber?</p>