class User < ActiveRecord::Base
  typed_serialize :preferences, Array
end

ruby-1.9.1-p378 > User.first.preferences
RuntimeError: implicit argument passing of super from method defined by define_method() is not supported. Specify all arguments explicitly.
    from /Users/toby/.rvm/gems/ruby-1.9.1-p378@jibe/gems/typed_serialize-0.1.0/lib/typed_serialize.rb:7:in `block in typed_serialize'
    from (irb):3
    from /Users/toby/.rvm/rubies/ruby-1.9.1-p378/bin/irb:17:in `<main>'