fileBuilder.append(".tmp")
        dirtyFiles += directory / fileBuilder.toString()
        fileBuilder.setLength(truncateTo)
      }
    }

    /** Set lengths using decimal numbers like "10123". */
    @Throws(IOException::class)
    internal fun setLengths(strings: List<String>) {
      if (strings.size != valueCount) {
        invalidLengths(strings)
      }

      try {