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Does following call chain need 6 words for work space instead of 5, i.e.

  (##core#inline_allocate  
    ("C_s_a_i_digits_to_integer" 6)
    str start (car end) radix neg?)) 

?

https://github.com/jjhoo/chicken-core/blob/master/library.scm#L2471
https://github.com/jjhoo/chicken-core/blob/master/runtime.c#L10956
https://github.com/jjhoo/chicken-core/blob/master/chicken.h#L2411 (4?)
https://github.com/jjhoo/chicken-core/blob/master/chicken.h#L2376 (2?)

(scan-digits+hashes
          (lambda (start neg? all-hashes-ok?)
            (let* ((digits (and (not seen-hashes?) (scan-digits start)))
                   (hashes (if digits
                               (and (cdr digits) (scan-hashes (cdr digits)))
                               (and all-hashes-ok? (scan-hashes start))))
                   (end (or hashes digits)))
              (and-let* ((end)
                         (num (##core#inline_allocate
			       ("C_s_a_i_digits_to_integer" 5)
			       str start (car end) radix neg?)))
                (when hashes            ; Eeewww. Feeling dirty yet?
                  (set! seen-hashes? #t)
                  (go-inexact! neg?))
(cons num (cdr end))))))