eager loading polymorphic has_one association with conditions generates incorrect sql

Given the following association in an "Org" model:

has_one :primary_address, :class_name => "Address", :as => :addressable, :conditions => { :primary => true }

The following query will be generated if you don't use :include and reference the primary_address:

SELECT * FROM "addresses" WHERE ("addresses".addressable_id = 1 AND "addresses".addressable_type = E'Org' AND ("addresses"."primary" = 't')) LIMIT 1

but if you do an "Org.find" and :include => :primary_address, you get the following, incorrect sql during the address load:

SELECT "addresses".* FROM "addresses" WHERE ("addresses"."addressable_id" IN (1) and "addresses"."addressable_type" = 'Org' AND ("orgs"."primary" = 't'))

Here, it's applying the conditions hash to the Org, rather than to the Address.