code: def _len_set(obj):
      '''Length of frozen/set (estimate).
      '''
      n = len(obj)
      if n > 8:  # assume half filled
         n = _power2(n + n - 2)
      elif n:  # at least 8
         n = 8
      return f _len_set(obj):
      '''Length of frozen/set (estimate).
      '''
      n = len(obj)
      if n > 8:  # assume half filled
         n = _power2(n + n - 2)
      elif n:  # at least 8
         n = 8
      return n
docs: Length of frozen/set (estimate).