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  1. or download this
    use Devel::Peek;

...
Dump $x;
vec($x, 0, 2) = 3;
Dump $x;
  2. or download this
    SV = PV(0x1b6a088) at 0x1b8b340
  REFCNT = 1
...
  PV = 0x1b7a9a0 "goo"\0
  CUR = 3
  LEN = 8