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  1. or download this
    use Devel::Peek;
$x = [];
...
$x = undef;
$x = [];
Dump($x, 1);
  2. or download this
    SV = IV(0x51a420) at 0x51a424
  REFCNT = 1
...
    MAX = -1
    ARYLEN = 0x0
    FLAGS = (REAL)