in reply to memory deallocation

my $i=0 , @X ;

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Nope. Consider: 

my $i=0 , @X;
print "\@X is a global!\n" if defined $main::{X};
__END__
@X is a global!

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You want: 

my ($i, @X) = 0; # $i gets the zero, @X gets nothing

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or better 

my $i = 0;
my @X;

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--shmem 

_($_=" "x(1<<5)."?\n".q·/)Oo.  G°\        /
                              /\_¯/(q    /
----------------------------  \__(m.====·.(_("always off the crowd"))."·
");sub _{s./.($e="'Itrs `mnsgdq Gdbj O`qkdq")=~y/"-y/#-z/;$e.e && print}

In Section Seekers of Perl Wisdom