• uniq() was not mentioned in the perldocs and only had
  the XS implementation
  
• uniq() also produced wrong results on 5.8.0
  (thanks to Slaven Rezic for spotting it and suggesting
  a workaround)
  
• the test-suite triggered a bug in 5.6.x perls
  
• the test-suite now tests both the XS- and Perl-implementation
  
• a wrong example in the perldocs fixed (Ron Savage)