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/6055#issuecomment-1019306532,https://api.github.com/repos/pydata/xarray/issues/6055,1019306532,IC_kwDOAMm_X848wWIk,3383837,2022-01-22T16:45:52Z,2022-01-22T16:45:52Z,CONTRIBUTOR,For future searchers: @jp-dark just added a feature to the upcoming release of the tiledb backend introducing an argument `encode_fill` to set (or not) the `_FillValue` metadata in XArray. Then the XArray `mask_and_scale` works as documented.,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,1075765204
https://github.com/pydata/xarray/issues/6055#issuecomment-991042526,https://api.github.com/repos/pydata/xarray/issues/6055,991042526,IC_kwDOAMm_X847Ehve,3383837,2021-12-10T14:59:29Z,2021-12-10T15:25:11Z,CONTRIBUTOR,"@dcherian Chiming in as the author of TileDB-Inc/TileDB-CF-py#117. To help ensure the tiledb backend matches the behavior of `xr.open_dataset` for netCDF files, can you help me understand why the promotion to float does _NOT_ occur in the following case:

```
import netCDF4
import xarray  as xr
import numpy as np

filename = 'temp_file.nc'
with netCDF4.Dataset(filename, mode=""w"") as group:
    group.createDimension(""index"", 4)
    var = group.createVariable(""var"", np.int16, (""index"",))
    var[0:3] = np.array([5, 6, 7], dtype=np.int16)
dataset = xr.open_dataset(filename)
dataset[""var""].dtype
```

Note that `netCDF.default_fillvalues['i2']` is the value found at dataset[""var""][3], which was never explicitly written. Here XArray seems to ignore the fill value.

**Update**

Okay, I think I understand why. In `createVariable` whether I use the default `fill_value=None` or set `fill_value=False`, XArray does not include `_FillValue` in `dataset[""var""].encoding`. That, I think, is a bug. If you `print(var)` with `fill_value=None`, you'll see that NetCDF is setting the `_FIllValue` attribute. I don't think XArray should ignore it.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,1075765204