How to reproduce:
In Python:
> import _frozen_importlib
> print(_frozen_importlib.__spec__.origin)

Observed result:
The __spec__.origin attribute of the _frozen_importlib module is None.

Expected result:
The __spec__.origin attribute of the _frozen_importlib module should be 'frozen', like it is already the case for the _frozen_importlib_external module and documented for all frozen modules in PEP 451: https://www.python.org/dev/peps/pep-0451/#origin