title: Calculated property set as optional get as non optional
body: <p>I wanna create calculated property:</p>
  <pre><code>  var status: Int? {
      get { return _status }
      set {
        if let newValue = newValue {
          updateStatus(newValue: newValue)
        }
      }
    }
  </code></pre>
  <p>Where _status is :Int.
  But I wanna geting at non-optional.</p>
  <p><code>user.status</code> without <code>!</code></p>
  <p>How the best way for do it?</p>