If you want different arrays, with the same scalar things inside, you can do:
use Data::Dumper;
$h{a} = [qw/x y z/];
$h{b} = &{sub {\@_}}(@{$h{a}});
$h{a}->[0] = 'new_x_is_shared';
push @{$h{a}}, 'pusher_is_not_shared';
print Dumper $h{a};
print Dumper $h{b};
with the output:
$VAR1 = [
'new_x_is_shared',
'y',
'z',
'pusher_is_not_shared'
];
$VAR1 = [
'new_x_is_shared',
'y',
'z'
];
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