It used to be written in Perl, back in the day... I suspect some of those tests are quite likely to be from back then.

I smiled when I read the title, thinking "How cool! Something I was using at a job I left ~16 years ago has _finally_ made it to version 1.6!" :-)

(I suspect the old LiveJournal Perl code probably didn't have it's version numbers carry over into this somewhat more modern version...)