id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,active_lock_reason,draft,pull_request,body,reactions,performed_via_github_app,state_reason,repo,type
703550109,MDExOlB1bGxSZXF1ZXN0NDg4NjM5MDYy,4431,Refactor of the big if-chain to a dictionary in the form {backend_name: backend_open}.,226037,closed,0,,,9,2020-09-17T12:39:55Z,2020-12-10T10:30:40Z,2020-09-24T15:03:46Z,MEMBER,,0,pydata/xarray/pulls/4431,"This ports the clean up of the messy if-else-chain from #3166. It should make adding the new back-end API easier.

The change is relatively trivial, but it touches code in `xr.open_dataset` so extra care should be used by reviewers. We think the change is safe and it does pass all tests.

 - [x] Port the generic part of #3166
 - [x] Tests sync'ed
 - [x] Passes `isort . && black . && mypy . && flake8`
 - [x] No user visible change
 - [x] No new functions/methods

I cannot add reviewers myself, but we agreed this should go to @jhamman.","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/4431/reactions"", ""total_count"": 3, ""+1"": 3, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,,13221727,pull