title: stringWithFormat not working in LLDB
body: <p>Why doesn't this work?</p>
  
  <pre><code>(lldb) po [NSString stringWithFormat:@"%f", 1.0]
  error: too many arguments to method call, expected 1, have 2
  error: 1 errors parsing expression
  </code></pre>
  
  <p>But this does:</p>
  
  <pre><code>(lldb) p (void)printf("%f", 1.0)
  1.000000
  </code></pre>
  
  <p>Is Objective-C variable arguments syntax not supported in LLDB?</p>