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
301856320,MDExOlB1bGxSZXF1ZXN0MTcyNTY4Njcx,1953,Fix maybe_promote,1997005,closed,0,,,3,2018-03-02T18:11:49Z,2018-08-20T16:35:50Z,2018-08-20T16:31:16Z,CONTRIBUTOR,,0,pydata/xarray/pulls/1953,"With tests for every possible dtype:

(numpy docs say `biufcmMOSUV` only)

```python
for letter in string.ascii_letters:
    try:
        print(letter, np.dtype(letter))
    except TypeError as exc:
        pass
```

 - [x] Closes #1952
 - [x] Tests added (for all bug fixes or enhancements)
 - [x] Tests passed (for all non-documentation changes)
 - [ ] 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)
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