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"wiki" is being use as the interwiki link to the original wiki, WikiWikiWeb at http://c2.com/cgi/wiki, so you shouldn't use that for anything related to Wikipedia. You are getting it returned since Wikipedias can use it as an interwiki link to the WikiWikiWeb, i.e. [[:wiki:WelcomeVisitors]] becomes http://c2.com/cgi/wiki?WelcomeVisitors
So this means essentially 'wiki' in toolserver DB (like e.g. 'dewiki') does not refer to the same as 'wiki' in pywikipediabot and interwiki... (strange...)
But would also explain this 'inconsistency'... ;)
Thanks and Greetings