[Chicken-janitors] #569: integer->char doesn't work right with negative numbers

[Chicken Trac]

#569: integer->char doesn't work right with negative numbers
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 Reporter:  shawnw          |       Owner:       
     Type:  defect          |      Status:  new  
 Priority:  major           |   Milestone:  4.7.0
Component:  core libraries  |     Version:  4.6.x
 Keywords:                  |  
----------------------------+-----------------------------------------------
 (integer->char -1) => #\U1fffff but (char->integer #\U1fffff) => 2097151

 Found this when trying to make a non-blocking ncurses app: getch and
 friends return -1 when there's no ready input.

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Ticket URL: <http://bugs.call-cc.org/ticket/569>
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