def convert(*filters)
      filters = filters.flatten.map { |f| Filters.resolve!(f) }

      entries.each_value do |entry|
        entry.convert!(*filters) if !block_given? || yield(entry)
      end

      self
    end
def convert(*filters)
      filters = filters.flatten.map { |f| Filters.resolve!(f) }

      entries.each_value do |entry|
        entry.convert!(*filters) if !block_given? || yield(entry)
      end

      self
    end
Converts all enties using the given filter(s). If an optional block is given
 the block is used as a condition (the block will be called with each
 entry). @see Entry#convert!