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=over 4
 
=item new ()
 
Create a new C<Array::Diff> object.
 
=cut
 
sub new {
    my $self = shift->SUPER::new(@_);
 
    $self->{diff_class} ||= $INC{'Algorithm/Diff/XS.pm'} ? 'Algorithm::Diff::XS' : 'Algorithm::Diff';
 
    $self;
}
 
=item diff ( OLD, NEW )
 
Compute the differences between two arrays.  The results are stored
in the C<added>, C<deleted>, and C<count> properties that may be