Roland Winkler <winkler@gnu.org> writes:

 >> Docs could be improved here.  Not having a :tag, is almost never a
 >> good idea.  This would be specific to the section Defining New Types.
 >
 > I am keeping this bug open.  Can you possibly provide a documentation
 > patch regarding the :tag keyword for new types?  Thanks.

Here's an attempt.  Please review.