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  1. or download this
    use strict;
use warnings;
...
Dump $buffer;
foo($buffer);
Dump $buffer;
  2. or download this
    SV = PV(0x2352069fd80) at 0x235206db678
  REFCNT = 1
...
  PV = 0x2352279a8a0 "Hello there"\0
  CUR = 11
  LEN = 16
  3. or download this
    SV = PV(0x2076e35a3b0) at 0x2076e41b338
  REFCNT = 1
...
  PV = 0x2077084ae90 "Hello there"\0
  CUR = 11
  LEN = 62