That certainly wins the "don't reinvent the wheel" award. :)
I ended up going with something a bit more self-contained (do need POSIX though, just to get started). Removing the validation checks from the snippet below, where $ARGV is the first value, and $ARGV1 is the count, I ended up with:
use feature 'state';
my $b36str = lc $ARGV;
my $begnum = POSIX::strtol($b36str,36);
for (my $i = $begnum; $i < $begnum+$ARGV; $i++)
$b36str = base36($i);
my ($tmpval) = @_;
state $digits = join '', '0'..'9', 'a'..'z';
my $newstr = '';
$newstr = substr($digits, $tmpval % 36, 1) . $newstr;
$tmpval = int $tmpval / 36;
return $newstr || '0';
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