...(skipping prologue)

my $p=main->SUPER::new({scalar=>1, arr=>[1,2,3,4], 
                        hsh=>{one=>1, two=>2, three=>3}});
#w/o lvalue:

$p->scalar($p->scalar+1);
$p->arr(1,22);
$p->arr(3,$p->arr(3)+$p->arr(1));
$p->hsh("two",22);
$p->hsh("total", $p->hsh("one")+$p->hsh("two"));
P "arr=%s", [$p->arr];
P "hsh=%s", $p->hsh;

    Vs. w/lvalue:
$p=$p->SUPER::new({arr=>[1,2,3,4], hsh=>{one=>1, two=>2, three=>3}});


++$p->value;  #or ($p->value++;)
$p->arr(1)  = 22;
$p->arr(3) += $p->arr(1);
$p->hsh("two") = 22;
$p->hsh("total") = $p->hsh("one")+$p->hsh("two");
P "arr=%s", [$p->arr];
P "hsh=%s", $p->hsh;

#both give same results:

arr=[1, 22, 3, 26]
hsh={one=>1, three=>3, total=>23, two=>22}
arr=[1, 22, 3, 26]
hsh={one=>1, three=>3, total=>23, two=>22}