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Re: IN on SFA'S

    "D) IN
        The value returned should be a fixnum that is the next binary value in
     the input stream.  The argument is the EOF value."

Behavior from LISP:

(setq sfa (sfa-create '(lambda (sfa op arg)
			  (cond ((eq op 'which-operations) '(in))
				(t arg))) ;; i.e. IN ==> EOF always
		      0 'foo))
(in sfa)