html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,performed_via_github_app,issue
https://github.com/pydata/xarray/issues/4311#issuecomment-822300379,https://api.github.com/repos/pydata/xarray/issues/4311,822300379,MDEyOklzc3VlQ29tbWVudDgyMjMwMDM3OQ==,49512274,2021-04-19T08:59:27Z,2021-04-19T08:59:27Z,NONE,"Problem found. 

Another example with more minimalistic code : 

```python
zname = '/tmp/test.zarr'
zh = zarr.open(zname, ""w"")

data = np.ones(10, dtype=np.uint32)
za = zh.array(""example"", data)
za.attrs[""_ARRAY_DIMENSIONS""] = [""obs""]  # or won't be read by xarray

print(""zarr   : "", za.dtype, za[:])

ds = xr.open_zarr(zname)
print(""xarray : "", ds.example.dtype, ds.example.values)
```
```python
>>> zarr   :  uint32 [1 1 1 1 1 1 1 1 1 1]
>>> xarray :  float64 [1. 1. 1. 1. 1. 1. 1. 1. 1. 1.]
```



After investigations, i found that you have to explicitly pass `fill_value=None` : 

```python
zname = '/tmp/test.zarr'
zh = zarr.open(zname, ""w"")

data = np.ones(10, dtype=np.uint32)
za = zh.array(""example"", data, fill_value=None)  # <--  default fill_value=0

za.attrs[""_ARRAY_DIMENSIONS""] = [""obs""]
print(""zarr   : "", za.dtype, za[:])

ds = xr.open_zarr(zname)
print(""xarray : "", ds.example.dtype, ds.example.values)
```
```python
>>> zarr   :  uint32 [1 1 1 1 1 1 1 1 1 1]
>>> xarray :  uint32 [1 1 1 1 1 1 1 1 1 1]
```

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