[Rails] Serialized attributed with native hash is saved as !ruby/hash:ActiveSupport::HashWithIndifferentAcce

Hi, I have a Rails 3 application. I want to save multiple values in a filed. But when i save I have this error in the field 

--- !ruby/hash:ActiveSupport::HashWithIndifferentAccess\nit: Padova\nde:
Padovan\n

this is my html

<input type="text" size="25" name="person[birthplace[it]]" id="person_birthplace[it]" value="" > <input type="text" size="25" name="person[birthplace[de]]" id="person_birthplace[de]" value="" >

My params 

{"utf8"=>"✓",
"authenticity_token"=>"RvpwQw/RdTAT2d4jtaSyBAYRgT1mKgWg9kyrS7pUnMo=",
"person"=>{"birthplace"=>{"it"=>"Padova", "de"=>"Padovan"}},
"commit"=>"Create Person", "action"=>"create", "controller"=>"people"}

I have another application where the data is save in this format for example

---\nit: Padova\nde: Padovan\n

and i don't have any error.

If i put in the model

serialize :birthplace, Hash

is correct but i have a diffrent format {:it=>"Padova",:de=>"Padovan"}

I read in the last part of this document

http://apidock.com/rails/ActiveRecord/AttributeMethods/Serialization/ClassMethods/serialize 

that Yaml is the default serialization and generate a string ---\n....

Any ideas?

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