title: what does allowLossyConversion mean in ios
body: <p>I am using the <code>dataUsingEncoding(encoding: NSStringEncoding, allowLossyConversion: Bool = default) -&gt; NSData?</code> function to convert String to NSData, but I don't get what <code>allowLossyConversion</code> actually means.</p>
  
  <p>Is it similar to Lossy compression? Can anybody help me understand this?</p>