# File lib/mongoid/contexts/mongo.rb, line 395
      def process_options
        fields = options[:fields]
        if fields && fields.size > 0 && !fields.include?(:_type)
          if fields.kind_of?(Hash)
            fields[:_type] = 1 if fields.first.last != 0 # Not excluding
          else
            fields << :type
          end
          options[:fields] = fields
        end
        options.dup
      end