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  1. or download this
    $ perl -MDevel::Peek -e'my $x = 123; Dump($x); $x = "abc"; Dump($x);'
    SV = IV(0x2764760) at 0x2764770
    ...
      CUR = 3
      LEN = 10
      COW_REFCNT = 1
    
  2. or download this
    Head                   Body
    +---------------+      +---------------+
    ...
    +---------------+
    | Unused        |
    +---------------+
    
  3. or download this
    Head                   Body
    +---------------+      +---------------+
    ...
    +---------------+      +---------------+
                           | IV/UV slot    |
                           +---------------+
    
  4. or download this
         + - - - - - - - +
          Unallocated    <--+
    ...
         +---------------+
         | IV/UV slot    |
         +---------------+