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  1. or download this
    $s = '20 ducks';;
Dump $s;;
...
  PV = 0x40cad18 "20 ducks"\0
  CUR = 8
  LEN = 16
  2. or download this
    $s += 1;;
Argument "20 ducks" isn't numeric in addition (+) at (eval 13) line 1,
+ <STDIN> line 4.
...
  PV = 0x40cad18 "20 ducks"\0
  CUR = 8
  LEN = 16
  3. or download this
    print $s;;
21
...
  PV = 0x40d3068 "21"\0
  CUR = 2
  LEN = 40