docs: def make_named_stemmer(stem=None, min_len=3):
      """Construct a callable object and a string sufficient to reconstruct it later (unpickling)
  
      >>> make_named_stemmer('str_lower')
      ('str_lower', <function str_lower at ...>)
      >>> make_named_stemmer('Lancaster')
      ('lancaster', <Stemmer object at ...>)
      """
      name, stem = stringify(stem), make_stemmer(stem=stem, min_len=min_len)
      if hasattr(stem, '__name__'):
          return stem.__name__, stem
      if name.strip().lower() in STEMMER_TYPES:
          return name.strip().lower(), stem
      if hasattr(stem, 'pattern'):
          return stem.pattern, stem
      return stringify(stem), stem