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package OOtest;
sub new {
...
   my $self = shift;
   return $self->{list};
}

my $obj = OOtest->new();
# NOT foreach my $tmp ( @{ $obj->list() } 
foreach my $tmp ( @{ $obj->get_array() } ) {
   # process list
}

package OOtest;
sub new {
...
   my $self = shift;
   return values %{$self->{list}}; # anything asking for an array gets
+ it
}