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  1. or download this
    use Devel::Peek qw( Dump );

...
my $x = "abc";
Dump( $x );
f( $x );            # Only a "C pointer" copied onto the stack.
  2. or download this
    SV = PV(0x55df7c8f0ee0) at 0x55df7c91f1e0    <-- One scalar
  REFCNT = 1
...
  CUR = 3
  LEN = 16
  COW_REFCNT = 1
  3. or download this
    use Devel::Peek qw( Dump );

...
my $x = "abc";
Dump( $x );
f( $x );            # Only a "C pointer" copied onto the stack.
  4. or download this
    SV = PV(0x5602d6441ee0) at 0x5602d6470148    <-- One scalar
  REFCNT = 1
...
  CUR = 3
  LEN = 16
  COW_REFCNT = 2