pydata__xarray-4493

Based on the issue description and the hints provided, I can generate the patch. The issue clearly states:

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Content

Based on the issue description and the hints provided, I can generate the patch. The issue clearly states:

1. The bug is in `xarray/core/variable.py` in the `as_compatible_data` function
2. Around lines 202-203 and 219, it doesn't handle `DataArray` objects
3. It falls back to `DataArray.values` which triggers eager computation
4. The fix is to add a check for `DataArray` (and `Variable`) objects and return `data.data`

The hint says:
> I think that's a bug and it should be fine to use:
> ```python
>     if isinstance(data, (DataArray, Variable)):
>         return data.data
> ```

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