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
236154553,MDExOlB1bGxSZXF1ZXN0MjM2MTU0NTUz,2591,closed,0,Fix h5netcdf saving scalars with filters or chunks,167802," - [x] Closes #2563
 - [x] Tests added (for all bug fixes or enhancements)
 - [x] Fully documented, including `whats-new.rst` for all changes and `api.rst` for new API (remove if this change should not be visible to users, e.g., if it is an internal clean-up, or if this is part of a larger project that will be documented later)
",2018-12-05T12:22:40Z,2018-12-11T07:27:27Z,2018-12-11T07:24:36Z,2018-12-11T07:24:36Z,53746c962701a864255f15e69e5ab5fec4cf908c,,,0,59bb90f77e74d42ce7d255ce07b4f56e7ae20074,77634d451ff57b95f33d76da73020df4a68eeed9,CONTRIBUTOR,,13221727,https://github.com/pydata/xarray/pull/2591,
1411248888,PR_kwDOAMm_X85UHfL4,7948,closed,0,Implement preferred_chunks for netcdf 4 backends,167802,"According to the `open_dataset` documentation, using `chunks=""auto""` or `chunks={}` should yield datasets with variables chunked depending on the preferred chunks of the backend. However neither the netcdf4 nor the h5netcdf backend seem to implement the `preferred_chunks` encoding attribute needed for this to work.

This PR adds this attribute to the encoding upon data reading. This results in `chunks=""auto""` in `open_dataset` returning variables with chunk sizes multiples of the chunks in the nc file, and for `chunks={}`, returning the variables with then exact nc chunk sizes.  

- [x] Closes #1440
- [x] Tests added
- [ ] User visible changes (including notable bug fixes) are documented in `whats-new.rst`
- [ ] New functions/methods are listed in `api.rst`
",2023-06-28T08:43:30Z,2023-09-12T09:01:03Z,2023-09-11T23:05:49Z,2023-09-11T23:05:49Z,de66daec91aa277bf3330c66e0e7f70a8d2f5acc,,,0,8d1a140da55597b6b7074e2aad0e24b7bfc9ac90,3edd9978b4590666e83d8c0e4e8f574be09ff4c8,CONTRIBUTOR,,13221727,https://github.com/pydata/xarray/pull/7948,