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  1. or download this
    if ($val eq '2') {
      print 'foo';
    }
    
  2. or download this
    if ($val == '2') {
      print 'foo';
    }
    
  3. or download this
    (Why do we have separate numeric and string comparisons?  Because
    we don't have special variable types, and Perl needs to know
    whether to sort numerically (where 99 is less than 100) or 
    alphabetically (where 100 comes before 99)