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--- * Making fields starting with _ always mutable (ignored by immutable model)
--- * Fixing problem where immutable (non undeletable) models with default lock_field couldn't be deleted after save (because of Django deletion collector needing to change id field)
--- * Allowing for full inheritance of immutability options within Meta
--- * Fixing problem with abstract models
--- * Version by Tim Diggins (red56) calling it django-immutablemodel and making immutability after save by default
--- * Version by Helder Silva (skandal) on bitbucket adding sign_off field. (not formally released)
--- *Release date: 28-Apr-2010* * Initial release by Rob Madole as django-immutablefield