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> Isn't __eq just for that?

  My bad.  I implemented __eq and because of a simple typo it was not
working correctly.  Then I came across this in the Lua book "As a full
userdata is an object, it is only equal to itself." and old list postings
which indicated that __eq doesn't work for userdata.  Also I seemed to
confused the "ud = ud" issue with this.  It all snowballed from simple
little bug.