add:  return true; 
context:   function isInvalidType(a) {    try {      JSON.toString(a);      return false;    } catch (ex) {      return ex instanceof TypeError;    }  }
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/10234/1b4d08d4fc6af45852aaaecbe577c63b4774e2f3/test_json.js/buggy/js/src/xpconnect/tests/unit/test_json.js