docs: def is_text_file(filename):
      """
      Test if the given path is a text-like file.
  
      Adapted from: http://stackoverflow.com/a/3002505
  
      Original Authors: Trent Mick <TrentM@ActiveState.com>
                        Jorge Orpinel <jorge@orpinel.com>
      """
      try:
          open(filename)
      except Exception:
          return False
      with open(filename, 'rb') as fid:
          try:
              CHUNKSIZE = 1024
              chunk = fid.read(CHUNKSIZE)
              # check for a UTF BOM
              for bom in [BOM_UTF8, BOM_UTF16, BOM_UTF32]:
                  if chunk.startswith(bom):
                      return True
              chunk = chunk.decode('utf-8')
              while 1:
                  if '\0' in chunk:  # found null byte
                      return False
                  if len(chunk) < CHUNKSIZE:
                      break  # done
                  chunk = fid.read(CHUNKSIZE).decode('utf-8')
          except UnicodeDecodeError:
              return False
          except Exception:
              pass
      return True