Rails - Jan 2006 - bug? : STI and :include => fk and class_name MUST be specified

I suspect this is a bug. Or a limitation.

Problem:
----------------
When you include a STI class in a ''find'' :
        @results = Result.find :all, :include => :event

, you are forced to specify the fk and the class name :
         belongs_to  :event , :class_name => "Event", :foreign_key
=>
"event_id"
.


Full code:
-----------

class Event < Foo   ### <<---- S.T.I.
     has_many    :results
end

class Result < ActiveRecord::Base
     belongs_to  :event ,
             :class_name => "Event", :foreign_key =>
"event_id"  ###
MANDATORY ?!

     acts_as_list
end

Alain

Q: If this is a unknown bug, do I have to report it officially?