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  1. or download this
    use Devel::Peek qw( Dump );
my $s = "abcdef";
...
Dump( $s );
substr( $s, 0, 1, "" );
Dump( $s );
  2. or download this
    SV = PV(0x59d752a54ee0) at 0x59d752a830d0
  REFCNT = 1
...
  PV = 0x59d752a6b2e1 ( "\x01" . ) "bcdefg"\0
  CUR = 6
  LEN = 15