Validation script that could address the reference is reused in Perl

gistfile.txt

#!/usr/bin/env perl

package AAA;

sub new { bless {} }

package main;

my $obj = AAA->new;

my $str  = "".$obj;
my $addr =  0+$obj;

my $try = 0;
while (1) {
    $try++;
    $obj = AAA->new;
    if ($obj == $addr) {
        die $try;
    }
}

__END__

fvm bokutin % perl a.pl
4 at a.pl line 19.

fvm bokutin % perl -V
Summary of my perl5 (revision 5 version 16 subversion 3) configuration:
   
  Platform:
    osname=freebsd, osvers=9.1-release-p4, archname=amd64-freebsd-thread-multi
    uname='freebsd fvm 9.1-release-p4 freebsd 9.1-release-p4 #0: mon jun 17 11:42:37 utc 2013 root@amd64-builder.daemonology.net:usrobjusrsrcsysgeneric amd64 '
    config_args='-de -Dprefix=/home/bokutin/perl5/perlbrew/perls/5.16.3-threaded -Dusethreads -Aeval:scriptdir=/home/bokutin/perl5/perlbrew/perls/5.16.3-threaded/bin'
    hint=recommended, useposix=true, d_sigaction=define
    useithreads=define, usemultiplicity=define
    useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
    use64bitint=define, use64bitall=define, uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='cc', ccflags ='-DHAS_FPSETMASK -DHAS_FLOATINGPOINT_H -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include',
    optimize='-O',
    cppflags='-DHAS_FPSETMASK -DHAS_FLOATINGPOINT_H -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include'
    ccversion='', gccversion='4.2.1 20070831 patched [FreeBSD]', gccosandvers=''
    intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
    ivtype='long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
    alignbytes=8, prototype=define
  Linker and Libraries:
    ld='cc', ldflags ='-pthread -Wl,-E  -fstack-protector -L/usr/local/lib'
    libpth=/usr/lib /usr/local/lib
    libs=-lm -lcrypt
    perllibs=-lm -lcrypt
    libc=, so=so, useshrplib=false, libperl=libperl.a
    gnulibc_version=''
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags=' '
    cccdlflags='-DPIC -fPIC', lddlflags='-shared  -L/usr/local/lib -fstack-protector'


Characteristics of this binary (from libperl): 
  Compile-time options: HAS_TIMES MULTIPLICITY PERLIO_LAYERS
                        PERL_DONT_CREATE_GVSV PERL_IMPLICIT_CONTEXT
                        PERL_MALLOC_WRAP PERL_PRESERVE_IVUV USE_64_BIT_ALL
                        USE_64_BIT_INT USE_ITHREADS USE_LARGE_FILES
                        USE_LOCALE USE_LOCALE_COLLATE USE_LOCALE_CTYPE
                        USE_LOCALE_NUMERIC USE_PERLIO USE_PERL_ATOF
                        USE_REENTRANT_API
  Built under freebsd
  Compiled at Jul 13 2013 15:42:31
  %ENV:
    PERL5LIB="/usr/local/ming/lib/perl5/site_perl/5.12.0/darwin-thread-multi-2level/:/home/bokutin/git/BOKUTIN-Private/lib:/home/bokutin/git/BOKUTIN-Utils/lib"
    PERLBREW_BASHRC_VERSION="0.64"
    PERLBREW_HOME="/home/bokutin/.perlbrew"
    PERLBREW_MANPATH="/home/bokutin/perl5/perlbrew/perls/5.16.3-threaded/man"
    PERLBREW_PATH="/home/bokutin/perl5/perlbrew/bin:/home/bokutin/perl5/perlbrew/perls/5.16.3-threaded/bin"
    PERLBREW_PERL="5.16.3-threaded"
    PERLBREW_ROOT="/home/bokutin/perl5/perlbrew"
    PERLBREW_VERSION="0.64"
    PERL_AUTOINSTALL_PREFER_CPAN="1"
    PERL_CPANM_OPT="--mirror http://www.cpan.org/ --mirror http://bokut.in/darkpan/ --mirror sftp://bokut.in/home/bokutin/public_html/privpan/"
  @INC:
    /usr/local/ming/lib/perl5/site_perl/5.12.0/darwin-thread-multi-2level/
    /home/bokutin/git/BOKUTIN-Private/lib
    /home/bokutin/git/BOKUTIN-Utils/lib
    /home/bokutin/perl5/perlbrew/perls/5.16.3-threaded/lib/site_perl/5.16.3/amd64-freebsd-thread-multi
    /home/bokutin/perl5/perlbrew/perls/5.16.3-threaded/lib/site_perl/5.16.3
    /home/bokutin/perl5/perlbrew/perls/5.16.3-threaded/lib/5.16.3/amd64-freebsd-thread-multi
    /home/bokutin/perl5/perlbrew/perls/5.16.3-threaded/lib/5.16.3
    .