Doctrine postSave, postUpdate and Internationalization (detect modification)

Question

I'm having a little problem with a tables that are using the i18n behaviour on a Symfony 1.4 project that I'm developing. For example on the following model defined on YAML (I have others that follow the same pattern):

Subject:
  actAs:
    Timestampable: ~
    I18n:
      fields: [name]
  columns:
    name: { type: string(255), notnull: true }
  relations:
    Publications:
      class: Publication
      refClass: PublicationSubject
      local: subject_id
      foreign: publication_id

I only have the name field that is internationalized but on save (after altering one of the languages on a form) the postUpdate($event) method doesn't get triggered. I thought, well I can use the postSave($event) method and check if it is modified but it also always returns false. So how do I detect if a Internationalized Doctrine model got modified?

Thanks in advance ;)