id,node_id,number,state,locked,title,user,body,created_at,updated_at,closed_at,merged_at,merge_commit_sha,assignee,milestone,draft,head,base,author_association,auto_merge,repo,url,merged_by
341790366,MDExOlB1bGxSZXF1ZXN0MzQxNzkwMzY2,3544,open,0,Open dataset cf options conflict solving,5948670,"It took some time*, but here is a suggestion to solve option conflicts in xarray.open_dataset().

If any of the options `mask_and_scale`, `decode_times`, `concat_characters`, or `decode_coords` is manually set and contradicts the manually set choice of `decode_cf` a `ValueError` will be raised.
This commit requires to change some option default values of open_dataset() parameters from `True` to `None`. I hope this is acceptable. 

 - [x] Closes #3020 
 - [x] Tests added
 - [x] Passes `black . && flake8` (`mypy`passes in principle, but backends/api.py:21 has an unrelated error)
 - [x] Fully documented, 
 - [ ] including `whats-new.rst` for all changes and `api.rst` for new API

What do you think? Do I have to add something to `whats-new.rst` and `api.rst`?

PS: (*) This is my first PR of this kind and I wanted to build it in a proper testing environment, but I had to set this up first.",2019-11-16T20:43:39Z,2022-06-09T14:50:17Z,,,6a671eb4f37fe06cc0cc1bf9dccb36fb7b28b1a5,,,0,04f926e40c62ea957a23946817d893dcf3ff52ce,d1e4164f3961d7bbb3eb79037e96cae14f7182f8,CONTRIBUTOR,,13221727,https://github.com/pydata/xarray/pull/3544,
374335374,MDExOlB1bGxSZXF1ZXN0Mzc0MzM1Mzc0,3766,closed,0,Allow plotting bool data,5948670,"as @dcherian said:

> matplotlib can plot `bool` values so we should add that to the check in `_ensure_plottable`.

<!-- Feel free to remove check-list items aren't relevant to your change -->

 - [x] Closes #3722 

",2020-02-12T14:22:11Z,2020-04-03T23:19:23Z,2020-04-03T23:19:23Z,2020-04-03T23:19:23Z,0181aa5741ce376a9dad45750754f3cf1ed41dde,,,0,4be5a1541582c57ef14e00ca9fa95a69f496da2b,1416d5ae475c0875e7a5d76fa4a8278838958162,CONTRIBUTOR,,13221727,https://github.com/pydata/xarray/pull/3766,