bpo-28556: Various updates to typing by ilevkivskyi · Pull Request #28 · python/cpython

 various updates from upstream python/typing repo:

- Added typing.Counter and typing.ChainMap generics
- More flexible typing.NamedTuple
- Improved generic ABC caching
- More tests
- Bugfixes
- Other updates

* Add Misc/NEWS entry

* Add issue number

(cherry picked from commit b692dc8)

 various updates from upstream python/typing repo:

- Added typing.Counter and typing.ChainMap generics
- More flexible typing.NamedTuple
- Improved generic ABC caching
- More tests
- Bugfixes
- Other updates

* Add Misc/NEWS entry

* Add issue number

(cherry picked from commit b692dc8)

- Ensure travis job has kicked off before checking for `pending` status.

28: test clean final r=ltratt a=nanjekyejoannah

This PR does the final cleanups to address the following:
- Allow higher recursion limit for some tests
- skip some tests that require very high recursion limits, I used the allowed limit by convention for the first item above
- call reset to allow warning propagation in some tests

Note:

Existing py3k tests fail with a segfault with -3 flag if not run individually, deleting this context manager in over 300 files will take forever, lets only run `test_py3kwarn` and the rest should be tested locally if modified. 

It took me long to know the source of this segfault, I have solved any issues with new context manager I introduce.

If this PR is merged, we can modify the CI, I am going back to implementing the warnings now.

Co-authored-by: Joannah Nanjekye <jnanjeky@unb.ca>