The 20170409 release is looking quite dated now, and 20190607 has been
available for some time.

It's quite frustrating to have to work with old documentation - I
frequently find myself having to go back and look up stuff on the live
web later.

Please consider refreshing this package from the latest upstream (and
perhaps consider packaging 20201016 for sid or experimental).

Dear Maintainer,

Peter Feichtinger has recently updated the offline archive:
https://github.com/PeterFeicht/cppreference-doc/releases/tag/v20211127

which contains many new C++20 features and makes it relatively easy to update the Debian packages.
Here are my instructions to make your own:
https://people.cs.aau.dk/~marius/beta/cppreference-debian.md
(I did not spend much time digging into details, there were lots of errors and warnings I ignored, but the package is very usable)

Preparation is tedious and takes a lot of computation time (more than an hour for me),
so it would be nice to have it directly from Debian.

Note that the current snapshot is from 2017, lacks many C++17 features and has nothing about C++20.

Best regards,
Marius