One trick people often use in this situation is to go in the reverse order, and this is a common trick across most languages:
use warnings;
use strict;
use Data::Dumper;
my @arr = ( 1, 2, 3 );
for (my $i = scalar @arr - 1; $i >= 0; $i --) {
my $a = pop @arr;
print "$a\n";
print Dumper(\@arr);
}
print Dump(@arr);
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