anchor.diff:  ;;
   
   (defun clip-index (n)
  -  (if (eq n :NaN 0
  +  (if (eq n :NaN) 0
         (let ((n (floor n)))
   	(if (< n 0) 0 n))))
   
  
positive.code:      ;;todo: type declarations
       ,@body))
  ;;
  (defparameter string.ctor
    (js-function (obj)
  	       (let ((str (if (stringp obj) obj (format nil "~A" obj))))
  
negative.code: print(s2.length)
  print(s2.length = 555)
  print(s2.length)
  print(s2.substr("1",8))
  print(s2.substring (0, 100))
  .
  