class ActiveModel::ForcedMutationTracker

def attr_names
  forced_changes.keys
end

def attribute_changed?(attr_name)
  forced_changes.include?(attr_name)
end

def change_to_attribute(attr_name)
  if finalized_changes&.include?(attr_name)
    finalized_changes[attr_name].dup
  else
    super
  end
end

def changed_in_place?(attr_name)
  false
end

def clone_value(attr_name)
  value = fetch_value(attr_name)
  value.duplicable? ? value.clone : value
rescue TypeError, NoMethodError
  value
end

def fetch_value(attr_name)
  attributes.send(:_read_attribute, attr_name)
end

def finalize_changes
  @finalized_changes = changes
end

def force_change(attr_name)
  forced_changes[attr_name] = clone_value(attr_name) unless attribute_changed?(attr_name)
end

def forget_change(attr_name)
  forced_changes.delete(attr_name)
end

def initialize(attributes)
  super
  @finalized_changes = nil
end

def original_value(attr_name)
  if changed?(attr_name)
    forced_changes[attr_name]
  else
    fetch_value(attr_name)
  end
end