# File lib/aws/s3/acl_object.rb, line 180
        def object_setter(klass, method_name, cast)
          define_method("#{method_name}=") do |value|
            validate_input(method_name, value)
            if value.kind_of?(cast)
              value = klass.new(value)
            end
            instance_variable_set("@#{method_name}", value)
          end
        end