[Chicken-janitors] #1575: utf8-srfi-string-every returns #f with empty string

[Chicken Trac]

#1575: utf8-srfi-string-every returns #f with empty string
---------------------+-------------------------------
 Reporter:  andyjpb  |                 Owner:
     Type:  defect   |                Status:  new
 Priority:  major    |             Milestone:  4.14.0
Component:  unknown  |               Version:  4.9.x
 Keywords:           |  Estimated difficulty:  easy
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 `(string-every (constantly 'hello) "")` returns #t with the regular
 version of `string-every` but `#f` with the utf8-srfi-13 version.

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Ticket URL: <https://bugs.call-cc.org/ticket/1575>
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