Strange perls behaviour (a question)

Good day.

I got an interesting case with perl 5.004 i386 Linux Redhat 5.0
I have some xs module (Net::RawIP) and using 
the  following statement in xsub.
u_int32_t value = SvIV(sv) ,  very simple.
The weirdness is that perl makes a  difference from a variable 
that is hardcoded in the  script and one given to it by a shell as a
parameter.
1)
$a = 4294967295; # 2**32 -1
somexs($a);
In the xs I get unsigned int 4294967295.
2)
$a = $ARGV[0];
somexs($a);
./script.pl 4294967295
In the xs I get int of 0x7FFFFFFF.
3)
$a = ~0 - (~0 - $ARGV[0]);
somexs($a);
./script.pl 4294967295
In the xs I get unsigned int 4294967295.
------------
In all of these ways if I trying to print $a then perl prints 4294967295.

If somebody would like to answer ( I know you all are very busy people),
then please answer by e-mail. I am not in the list.

Have a nice day.

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• Strange perls behaviour (a question) by Sergey V. Kolychev