class ActiveModel::Attribute::UserProvidedDefault

def initialize(name, value, type, database_default)
  @user_provided_value = value
  super(name, value, type, database_default)
end

def marshal_dump
  result = [
    name,
    value_before_type_cast,
    type,
    original_attribute,
  ]
  result << value if defined?(@value)
  result
end

def marshal_load(values)
  name, user_provided_value, type, original_attribute, value = values
  @name = name
  @user_provided_value = user_provided_value
  @type = type
  @original_attribute = original_attribute
  if values.length == 5
    @value = value
  end
end

def value_before_type_cast
  if user_provided_value.is_a?(Proc)
    @memoized_value_before_type_cast ||= user_provided_value.call
  else
    @user_provided_value
  end
end

def with_type(type)
  self.class.new(name, user_provided_value, type, original_attribute)
end