It's hardly broken; as with any code, one must understand how and why it works, what are its limitations, and not go about applying it blindly to every situation (eg. a deep compare of nested data structures). In any case, the simple-minded (shallow) approach is usually the one that is wanted for this task, especially when writing in OO-style.

As a further aside, my idiom is usually:
  
my %uniq;
undef @uniq{@arr};
@arr = keys %uniq;

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   MeowChow                                   
               s aamecha.s a..a\u$&owag.print

In reply to (MeowChow) Re2: The Mother Tongue by MeowChow
in thread The Mother Tongue by George_Sherston

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