[nnir] Suspected bug in group spec

[Harry Putnam <reader@newsguy.com>]

The most recent nnir.el (nnir-1.58) on Kai's ftp server seems to have
buggy code in the part that allows user to specify a target group.

But first, I hope this is not some malfeasance on this end.  I've
tried to carefully make sure I've loaded a non-bytecompiled
nnir-1.58.el by evaluationg this line (with C-x C-e) in scratch buffer. 

(load "nnir-1.58.el")  Then comparing the results after doing the same
to:

(load "nnir-1.57.el")

Is there some better way to know for sure what version of nnir is
currently loaded and in use?

I first noticed the problem I'm about to report when (using glimpse as
search engine) I ran this query:

   C-u G G
   Query: reader@newsguy\.com <RET> zoot <RET>
(zoot is an nnml group containing the mailing list of a redhat linux 
distribution)

   ls ~/Mail/zoot/[0-9]* |wc -l
   702
Not particularly large..

The query seemed to be dragging on much longer than I expected, so
began to watch the time it had been running.  When it passed 6 minutes
I knew something was wrong, but thought it might be the escaped "."

Just as I was about to abort, gnus came through with the goods and
asked how many of the 12,600+ messages I wanted to view.

Huh?  where did all those come  from in a group of 700+

I told gnus to load them all, which took another couple minutes.
Finally I say what had happened is that the group spec had not been
honored.

There were messages from dozens of groups.
Tried the routine a few more times but the group spec is not honored.