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  1. or download this
    use Devel::Peek qw( Dump );
$_ = "x" x 999;
...
Dump( $_ );
$_ = "abc";
Dump( $_ );
  2. or download this
    SV = PV(0x5b5d1f3fdee0) at 0x5b5d1f439bc8
  REFCNT = 1
...
  PV = 0x5b5d1f441580 "abc"\0    <-- Same buffer
  CUR = 3
  LEN = 1001                     <-- Same size
  3. or download this
    use Devel::Peek qw( Dump );
$_ = "abcdefghi";
...
Dump( $_ );
substr( $_ , 0 , 1 ) = "";
Dump( $_ );
  4. or download this
    SV = PV(0x600760853ee0) at 0x6007608a35d8
  REFCNT = 1
...
  PV = 0x60076086a2e1 ( "\x01" . ) "bcdefghij"\0
  CUR = 9
  LEN = 15