title: Converting circular structure to JSON -- Any way to find what field it is complaining about?
body: <p>I'm trying to stringify(...) an object in Chrome, and I keep getting a "Converting circular structure to JSON" message, despite the fact that (as far as I know) no such structure exists.</p>
  
  <p>I've been over the code a dozen times and can't find any circular references whatsoever. Is there any way to get Chrome to tell me what it's bitching about beyond this painfully useless error message?</p>