# File lib/active_support/vendor/i18n-0.4.1/i18n/locale/fallbacks.rb, line 87
      def compute(tags, include_defaults = true)
        result = Array(tags).collect do |tag|
          tags = I18n::Locale::Tag.tag(tag).self_and_parents.map! { |t| t.to_sym }
          tags.each { |tag| tags += compute(@map[tag]) if @map[tag] }
          tags
        end.flatten
        result.push(*defaults) if include_defaults
        result.uniq
      end