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
420139027,MDU6SXNzdWU0MjAxMzkwMjc=,2807,can the callables of apply_ufunc + dask get a typed/labeled array,280924,closed,0,,,5,2019-03-12T18:22:25Z,2019-10-15T15:01:08Z,2019-10-15T15:01:08Z,CONTRIBUTOR,,,,"#### Code Sample

```python
def print_type(arr):
    """"""Generalized ufunc to print the type.""""""
    print(f""type={type(arr)}"")
    return arr

chunked = da.from_array(np.random.random(size=(2, 2, 2, 140, 200)), chunks=(1, 1, 1, 140, 200)) 

x = xr.DataArray(chunked)
xr.apply_ufunc(print_type, x, dask='parallelized', output_dtypes=[np.float32]).compute()
```

#### Problem description

It would be great if the arrays passed to the callables were subselections of the original xarray.  Advantages: labeled dimensions and coordinates
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495974092,MDExOlB1bGxSZXF1ZXN0MzE5NDE5NTQ4,3325,Fix DataArray.to_netcdf type annotation,280924,closed,0,,,1,2019-09-19T19:01:56Z,2019-09-27T05:45:34Z,2019-09-27T05:45:26Z,CONTRIBUTOR,,0,pydata/xarray/pulls/3325,"It calls DataSet.to_netcdf, which returns Union[bytes, ""Delayed"", None].  So this should as well.","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/3325/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,,13221727,pull
347503891,MDExOlB1bGxSZXF1ZXN0MjA2MTEzMzQ3,2339,Use sorted fixtures to ensure that test gathering is consistent.,280924,closed,0,,,0,2018-08-03T19:01:28Z,2018-08-06T14:57:16Z,2018-08-06T14:57:16Z,CONTRIBUTOR,,0,pydata/xarray/pulls/2339,"pytest-xdist expects that test gathering produces the same results and in the same order.  Because sets, prior to python 3.7, do not guarantee ordering, this can cause pytest -n (from pytest-xdist) to fail.

 - [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)
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