I want use the api to list all pages that are in any of the categories
which are in Category:Category_redirects on commons. So I tried
but apparently it's not that easy...
IMHO "list=categorymembers" should not insist on "cmcategory", but
rather try to fall back to the generator list.
Additionally, the 500 limit could be imposed on the actual output; as
the generator is internal, it could have 5000 or unlimited (depending