[$] Debian opens a can of username worms

It has long been said that naming things
is one of the hard things to do in computer science. That may be
so, but it pales in comparison to the challenge of handling
usernames properly in applications. This is especially true when multiple
applications are involved, and they are all supposed to agree on what
characters are, and are not, allowed. The Debian project is facing
that problem right now, as two user-creation utilities disagreed about
which names are allowable. A plan is in place to sort this out
before the release of Debian 13 ('trixie') sometime next year.