* Use enum for typing NOTHING.
This will allow those extending attrs
to type NOTHING as Literal[NOTHING].
* Make test_dunders test `NOTHING` directly
* Reflect NOTHING enum typing in __init__.pyi
* Fix docs for NOTHING
* Add changelog entry
* [pre-commit.ci] auto fixes from pre-commit.com hooks
for more information, see https://pre-commit.ci
Co-authored-by: Hynek Schlawack <hs@ox.cx>
Co-authored-by: Tin Tvrtković <tinchester@gmail.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Kevin M Granger