Please explain how and why value of @_ is keeps changing in same subroutine "formatlist" in below code
[root@mail ~]# perl test.pl -w
-w out return
Command Line in return
Command Line: -w
[root@mail ~]# cat test.pl
my @list = @_;
print @_, ' out return', "\n";
print @_, ' in return', "\n";
my $title = shift;
print "$title: ", join(' ',@list),"\n";
$arguments = formatlist(@ARGV);
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