prepare_value_for_validation

# File activemodel/lib/active_model/validations/numericality.rb, line 122
      def prepare_value_for_validation(value, record, attr_name)
        return value if record_attribute_changed_in_place?(record, attr_name)

        came_from_user = :"#{attr_name}_came_from_user?"

        if record.respond_to?(came_from_user)
          if record.public_send(came_from_user)
            raw_value = record.public_send(:"#{attr_name}_before_type_cast")
          elsif record.respond_to?(:read_attribute)
            raw_value = record.read_attribute(attr_name)
          end
        else
          before_type_cast = :"#{attr_name}_before_type_cast"
          if record.respond_to?(before_type_cast)
            raw_value = record.public_send(before_type_cast)
          end
        end

        raw_value || value
      end