This is a bit funny.
http://en.wikipedia.org/w/api.php?action=query&list=embeddedin&eitit...
Note the zero value for the limit.
The return value is as follows. The container is empty, which is okay as far as it goes.
<?xml version="1.0"?> <api> <query> <embeddedin /> </query> <query-continue> <embeddedin eicontinue="10|Stub|1922147" /> </query-continue> </api>
But note the query-continue element in the response. The result of calling the API again with the eicontinue attribute above as a parameter is of course an identical response. This could lead naively written client code into an eternal loop of repeated API calls.
I'd expect an error to be thrown here. Perhaps an API call with a limit of 0 should really be treated as invalid and an api error code should be returned, or perhaps it should be treated the same as a negative limit, which currently seems to return an empty body with no query-continue element.