title: NSString boolValue return nil
body: <p>Never mind, I was doing "po x" instead of "p x" in debugger. tnx!</p>
  
  <p>Why is this not returning NO :</p>
  
  <pre><code>BOOL x = [@"0" boolValue];
  </code></pre>
  
  <p>According to documentation:</p>
  
  <blockquote>
    <p>@property(readonly) BOOL boolValue
    Discussion
    This property is YES on encountering one of "Y", "y", "T", "t", or a digit 1-9—the method ignores any trailing characters. This property is NO if the receiver doesn’t begin with a valid decimal text representation of a number.</p>
  </blockquote>