title: Populating an NSString with a null value
body: <p>In short, I need a string that contains null, rather than (null).</p>
  
  <p>For example: </p>
  
  <pre><code>NSString *jsonRequest = [NSString stringWithFormat:@"{\"ename\":%@}", nil];
  </code></pre>
  
  <p>Forms a request that looks like:</p>
  
  <pre><code>{ "ename" : (null) }
  </code></pre>
  
  <p>But I need it to look like </p>
  
  <pre><code>{ "ename" : null }
  </code></pre>
  
  <p>Replacing nil with Nil, NULL, [NSNull null] all equate to the same output string.</p>
  
  <p>Is there a way to accomplish this? The problem comes when I send my request to the server and it tries to parse it, but doesn't like the parenthesis around the null.</p>