I'm going though a lot of old posts to add the proper artist tag, and sometimes the artist is aliased to invalid_tag because the artist doesn't want to be tagged for personal reasons.
These artists should IMO be aliased to anonymous_artist instead, because otherwise a lot of posts:
1. Get tagged with the correct artist tag
2. The tag is aliased to invalid_tag
3. The poster removes invalid_tag, leaving a post with no artist tags
4. Automatic tag scripts go though all arttags:0 posts and add unknown_artist
Which is annoying. anonymous_artist is perfect for the job: "For one reason or another, some people don't wish to be connected with a particular piece of art."
Thoughts?