issue_comments: 812868025

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https://github.com/pydata/xarray/issues/4796#issuecomment-812868025 https://api.github.com/repos/pydata/xarray/issues/4796 812868025 MDEyOklzc3VlQ29tbWVudDgxMjg2ODAyNQ== 14808389 2021-04-03T13:49:25Z 2021-04-03T13:49:25Z MEMBER

the issue is that we pass *args and **kwargs unmodified to dask, which obviously won't work (if isinstance(x.data, np.ndarray) == True it will be casted to numpy using asarray, which is why that succeeds).

I think this means that we should check for xarray objects in args / kwargs in {DataArray,Dataset,Variable}._unary_op and extract the data before calling f (which might be easier to implement if we stop injecting numpy methods).

 
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