issue_comments: 631689889

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https://github.com/pydata/xarray/pull/4060#issuecomment-631689889 https://api.github.com/repos/pydata/xarray/issues/4060 631689889 MDEyOklzc3VlQ29tbWVudDYzMTY4OTg4OQ== 1217238 2020-05-20T19:50:23Z 2020-05-20T19:50:23Z MEMBER

The original motivation for requiring dask='allowed' is that I was concerned that users would put a function that coerces its arguments into NumPy arrays into apply_ufunc (e.g., like many functions from SciPy), which could have surprisingly bad performance when called on dask arrays due to automatic coercion.

Maybe this is too defensive/surprising, and could be relaxed. We don't really have any guard-rails like this elsewhere in xarray.

 
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