*** $array_ref_1  = \@array ***
$VAR1 = [
          1,
          2,
          3
        ];

*** $array_ref_2 = [@array] ***
$VAR1 = [
          1,
          2,
          3
        ];

*** $array_ref_3 = [1, 2, 3] ***
$VAR1 = [
          1,
          2,
          3
        ];

*** $array_ref_ref = [\@array] ***
$VAR1 = [
          [
            1,
            2,
            3
          ]
        ];

SAME: $array_ref_1 and $array_ref_1_new
SAME: ARRAY(0x7fa0f202a628) and ARRAY(0x7fa0f202a628)

DIFF: $array_ref_2 and $array_ref_2_new
DIFF: ARRAY(0x7fa0f2029c68) and ARRAY(0x7fa0f210e2a8)

DIFF: $array_ref_3 and $array_ref_3_new
DIFF: ARRAY(0x7fa0f2029d40) and ARRAY(0x7fa0f20ca2f0)

SAME: $array_ref_1 and $array_ref_1_new and $array_ref_ref->[0]
SAME: ARRAY(0x7fa0f202a628) and ARRAY(0x7fa0f202a628) and ARRAY(0x7fa0f202a628)