encode

# File activemodel/lib/active_model/attribute_set/yaml_encoder.rb, line 12
      def encode(attribute_set, coder)
        coder["concise_attributes"] = attribute_set.each_value.map do |attr|
          if attr.type.equal?(default_types[attr.name])
            attr.with_type(nil)
          else
            attr
          end
        end
      end