autodoc_default_options should accept True values

[jwodder]

Short version: Instead of this:

autodoc_default_options = {"members": None}

it would make more sense to be able to write this:

autodoc_default_options = {"members": True}

---

The new autodoc_default_options config option currently requires that its dict values be either strings or None, where None "means 'yes/true/on'". Seeing as None means True, it would make more sense to be able to actually write True instead (but keep None around for backwards compatibility).

Currently (in Sphinx 1.8), setting an autodoc_default_options value to True just produces an unhelpful error message:

Exception occurred:
  File "/Users/jwodder/work/GITHUB/headerparser/.tox/docs/lib/python3.7/site-packages/sphinx/ext/autodoc/__init__.py", line 82, in members_option
    return [x.strip() for x in arg.split(',')]
AttributeError: 'bool' object has no attribute 'split'
The full traceback has been saved in /var/folders/l7/wrkq93d133d8zpn36fmqrq0r0000gn/T/sphinx-err-dld5die4.log, if you want to report the issue to the developers.
Please also report this if it was a user error, so that a better error message can be provided next time.
A bug report can be filed in the tracker at <https://github.com/sphinx-doc/sphinx/issues>. Thanks!

[tk0miya]

Fixed by #6053.
Thank you for your proposal!

[Borda]

When it will be in a release?

[tk0miya]

It was already released as v2.0.0 in last April.