has_many associations forced to have integer ids

In my app I am using uuids (strings) as primary keys for my tables. It seems that Rails 2.3.5 now forces you to use integer ids in has_many and habtm associations.

define_method("#{reflection.name.to_s.singularize}_ids=") do |new_value|
  ids = (new_value || []).reject { |nid| nid.blank? }.map(&:to_i)
  send("#{reflection.name}=", reflection.klass.find(ids).index_by(&:id).values_at(*ids))
end

If I try to assign ids and not whole objects, the integer conversion destroys the id strings and thus no association object can be found. Without the conversion everything works fine (again).

I added a patch with a small fix.