I recently took over maintenance for #Perl's Crypt::OpenPGP module. https://metacpan.org/pod/Crypt::OpenPGP. The latest release merged a significant number of older PRs that had languished on #GitHub for years and fixed a lot of issues. I am currently looking at support for parsing gnupg key box files that now hold public keys.

While reviewing the code I discovered https://metacpan.org/pod/Data::Buffer, an amazingly easy way to parse binary data files. Last released in 2001 and it still works great 23 years later.

That's despite running on completely different Linux distributions. Version 5.6.x Perl was at of the art in 2001. It still runs fine in 5.40 Perl - No changes needed.

What other Programming language provides that level of backward compatibility.