[MacRuby] #1289: ABPresence example app fails during init

[MacRuby]

#1289: ABPresence example app fails during init
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 Reporter:  merchants08@…                 |       Owner:  lsansonetti@…        
     Type:  defect                        |      Status:  new                  
 Priority:  minor                         |   Milestone:                       
Component:  MacRuby                       |    Keywords:                       
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Comment(by lsansonetti@…):

 Yes, because that API returns an NSString, which is not mutable. But the
 sample code does use #sort which should work on immutable NSStrings. So I
 don't understand why the exception is raised in his case.

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Ticket URL: <http://www.macruby.org/trac/ticket/1289#comment:5>
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