assert_valid_value

# File activerecord/lib/active_record/coders/column_serializer.rb, line 46
      def assert_valid_value(object, action))
        unless object.nil? || object_class === object
          raise SerializationTypeMismatch,
            "can't #{action} `#{@attr_name}`: was supposed to be a #{object_class}, but was a #{object.class}. -- #{object.inspect}"
        end
      end