collection_singular_ids ignores association :include option

Hi, I added test for https://rails.lighthouseapp.com/projects/8994-ruby-on-rails/tickets/6569-collection_singular_ids-ignores-association-include-option#ticket-6569-2

Maybe bug was introduced in https://github.com/rails/rails/commit/3436fdfc12d58925e3d981e0afa61084ea34736c

Would be great to hear something from Pratik or Diego Algorta.

Thanks, Anatoliy