How can I store a YAML object in Memcached ? Without a serializations problems.

Question

I'm using gem 'dalli' but the same problem happen with gem memcached-client

development.rb

config.cache_store = :dalli_store

My app controller

Rails.cache.write('presidentes', Candidato.by_cargo(:key => "Presidente"))
@presidentes = Rails.cache.read('presidentes')

If I debug the @presidentes var it returns

--- !binary |
BAhvOiBBY3RpdmVTdXBwb3J0OjpDYWNoZTo6RW50cnkJOhBAZXhwaXJlc19p
bjA6EEBjb21wcmVzc2VkRjoLQHZhbHVlbzoyQ291Y2hSZXN0OjpNb2RlbDo6

instead of

- !map:Candidato 
  nome_para_urna: RUI COSTA PIMENTA
  nome_completo: RUI COSTA PIMENTA
  _rev: 1-ab77e6c2549a64c9e46d4d4ee5bf99c9

I've already try to store in

:raw => true

but stills the same problem.

UPDATE 09/27

The problem is the YAML object that Marshall seems to don't understand.