docs: def do_filesizeformat(value, binary=False):
      """Format the value like a 'human-readable' file size (i.e. 13 KB,
      4.1 MB, 102 bytes, etc).  Per default decimal prefixes are used (mega,
      giga, etc.), if the second parameter is set to `True` the binary
      prefixes are used (mebi, gibi).
      """
      bytes = float(value)
      base = binary and 1024 or 1000
      middle = binary and 'i' or ''
      if bytes < base:
          return "%d Byte%s" % (bytes, bytes != 1 and 's' or '')
      elif bytes < base * base:
          return "%.1f K%sB" % (bytes / base, middle)
      elif bytes < base * base * base:
          return "%.1f M%sB" % (bytes / (base * base), middle)
      return "%.1f G%sB" % (bytes / (base * base * base), middle)