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After querying the deleted revisions for namespace 0 and some limit (tested with 10, 20 and 30), a drcontinue is also returned. After specifying it to continue, however, again the initial set of results (and the same drcontinue) are returned.

Repeated on 2 different wikis, one of them hosted by me.

Exchange dump (cut to save space):

Sent: Array
(
    [format] => php
    [maxlag] => 5
    [drnamespace] => 0
    [drlimit] => 30
    [list] => deletedrevs
    [action] => query
)

Received: Array
(
   [query] => Array
        (
            [deletedrevs] => Array
                (
 (--snip 30 results--)
                )
    [query-continue] => Array
        (
            [deletedrevs] => Array
                (
                    [drcontinue] => 0|Data Entry Jobs Winnipeg Manitoba - film jobs in prague|20120304135046
                )

        )

)

Sent: Array
(
    [format] => php
    [maxlag] => 5
    [drnamespace] => 0
    [drlimit] => 30
    [drcontinue] => 0|Data Entry Jobs Winnipeg Manitoba - film jobs in prague|20120304135046
    [list] => deletedrevs
    [action] => query
)

Received: Array
(
   [query] => Array
        (
            [deletedrevs] => Array
                (
 (--snip 30 results (exactly the same ones as above)--)
                )
    [query-continue] => Array
        (
            [deletedrevs] => Array
                (
                    [drcontinue] => 0|Data Entry Jobs Winnipeg Manitoba - film jobs in prague|20120304135046
                )

        )

)

and so on, until I stop the bot manually.