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
34089909,MDExOlB1bGxSZXF1ZXN0MzQwODk5MDk=,401,closed,0,Handle bool in NetCDF4 conversion,1634164,"I am working on some code that creates `xray.Datasets` with a 'bool' dtype.

Trying to call `Dataset.to_netcdf()` on this code causes `_nc4_values_and_dtype()` to raise a `ValueError`, so I added these few lines to force the storage of these variables as 1-byte integers.

Perhaps it should be 'u1' instead; I can change that if need be.
",2015-04-24T21:59:08Z,2016-05-26T18:51:06Z,2016-05-23T04:54:40Z,,cc75c65217f679729f2af01bacc16d56beb00061,,,0,60c43e076d06ab2eb0ceea44b20bd11488c8e9f2,eed58d5cb4274f262e77277bc8fcf394a9fae77c,FIRST_TIME_CONTRIBUTOR,,13221727,https://github.com/pydata/xarray/pull/401,
408964137,MDExOlB1bGxSZXF1ZXN0NDA4OTY0MTM3,4007,open,0,Allow DataArray.to_series() without invoking sparse.COO.todense(),1634164,"This adds some code (from iiasa/ixmp#317) that allows DataArray.to_series() to be called without invoking sparse.COO.todense() when that is the backing data type.

I'm aware this needs some improvement to meet the standard of the existing codebase, so I hope I could ask for some guidance on how to address the following points (including whom to ask about them):
- [ ] Make the same improvement in {DataArray,Dataset}.to_dataframe().
- [ ] Possibly move the code out of dataarray.py to a more appropriate location (where?).
- [ ] Possibly check for sparse.COO explicitly instead of xarray.core.pycompat.sparse_array_type. Other SparseArray subclasses, e.g. DOK, may not have the same attributes.

Standard items:
 - [ ] Tests added.
 - [x] Passes `isort -rc . && black . && mypy . && flake8`
   (Sort of: these wanted to modify 7 files beyond the one I touched; didn't commit these changes.)
 - [ ] Fully documented, including `whats-new.rst` for all changes and `api.rst` for new API.",2020-04-25T20:15:16Z,2022-06-09T14:50:17Z,,,97367f000d06c906a778dfd2868cda39d937e87d,,,0,b5581fcd49264992acf53e05ea17957f7f2be61b,d1e4164f3961d7bbb3eb79037e96cae14f7182f8,FIRST_TIME_CONTRIBUTOR,,13221727,https://github.com/pydata/xarray/pull/4007,