include?

# File activemodel/lib/active_model/validations/clusivity.rb, line 17
      def include?(record, value)
        members = if delimiter.respond_to?(:call)
                    delimiter.call(record)
                  elsif delimiter.respond_to?(:to_sym)
                    record.send(delimiter)
                  else
                    delimiter
                  end

        members.send(inclusion_method(members), value)
      end