use Devel::Peek;
...
sub save {
    Dump $_[0];
    push(@savearr, \$_[0]);
    readonly_on(${$savearr[-1]});
    Dump ${$savearr[-1]};
}
...

__END__
SV = PV(0x75cbc8) at 0x88d238            #
  REFCNT = 1
  FLAGS = (PADTMP,POK,pPOK)
  PV = 0x77e340 "begin 0 end"\0
  CUR = 11
  LEN = 16
SV = PV(0x75cc68) at 0x75ef48
  REFCNT = 1
  FLAGS = (POK,READONLY,pPOK)
  PV = 0x77e940 "begin 0 end"\0
  CUR = 11
  LEN = 16
SV = PV(0x75cbc8) at 0x88d238            #
  REFCNT = 1
  FLAGS = (PADTMP,POK,pPOK)
  PV = 0x77e340 "begin 1 end"\0
  CUR = 11
  LEN = 16
SV = PV(0x75cce8) at 0x7836b8
  REFCNT = 1
  FLAGS = (POK,READONLY,pPOK)
  PV = 0x78cc60 "begin 1 end"\0
  CUR = 11
  LEN = 16
SV = PV(0x75cbc8) at 0x88d238            #
  REFCNT = 1
  FLAGS = (PADTMP,POK,pPOK)
  PV = 0x77e340 "begin 2 end"\0
  CUR = 11
  LEN = 16
SV = PV(0x75ccf8) at 0x783700
  REFCNT = 1
  FLAGS = (POK,READONLY,pPOK)
  PV = 0x87bb70 "begin 2 end"\0
  CUR = 11
  LEN = 16
SV = PV(0x75cbc8) at 0x88d238            #
  REFCNT = 1
  FLAGS = (PADTMP,POK,pPOK)
  PV = 0x77e340 "begin 3 end"\0
  CUR = 11
  LEN = 16
SV = PV(0x75cd08) at 0x783748
  REFCNT = 1
  FLAGS = (POK,READONLY,pPOK)
  PV = 0x87bcd0 "begin 3 end"\0
  CUR = 11
  LEN = 16
$VAR1 = [
          \'begin 0 end',
          \'begin 1 end',
          \'begin 2 end',
          \'begin 3 end'
        ];