# File lib/archive/zip/extra_field/raw.rb, line 56
    def merge(other)
      if header_id != other.header_id then
        raise ArgumentError,
          "Header ID mismatch: #{header_id} != #{other.header_id}"
      end

      @central_record_data += other.central_record_data
      @local_record_data += other.local_record_data

      self
    end