instance method serialize

# File activemodel/lib/active_model/type/integer.rb, line 67
      def serialize(value)
        case value
        when ::Integer
          # noop
        when ::String
          int = value.to_i
          if int.zero? && value != "0"
            return if non_numeric_string?(value)
          end
          value = int
        else
          value = super
        end

        if out_of_range?(value)
          raise ActiveModel::RangeError, "#{value} is out of range for #{self.class} with limit #{_limit} bytes"
        end

        value
      end