In general, once a module is on CPAN, it's there until the module's author backpans it. If it really bugs you, write a patch and submit it to the author. The author is under no obligation to acccept, use, or endorce the use of that patch. In the meantime, let's move on.

String::LCSS_XS works better. Try this:

#!/usr/bin/perl -slw

use strict;
use String::LCSS_XS qw(lcss);

my $longest = lcss ( "as", "asdfasdfasdf" );
print $longest;
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