issue_comments: 436474639

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https://github.com/pydata/xarray/pull/2533#issuecomment-436474639 https://api.github.com/repos/pydata/xarray/issues/2533 436474639 MDEyOklzc3VlQ29tbWVudDQzNjQ3NDYzOQ== 31115101 2018-11-07T01:50:06Z 2018-11-07T01:50:06Z CONTRIBUTOR

I think the clean way to fix this would be to add error checking to DataArray.__array_wrap__. But we currently use this method inside DataArray._unary_op (and maybe elsewhere?), which is called every time you do unwary math with an xarray object (e.g., -). We’ll want to update these uses to use a method that uses the same shortcut to avoid redundant metadata checks.

Does adding fastpath to skip shape checking in array_wrap work? fastpath=True in both DataArray.array_wrap and Variable.array_wrap didn't seem to break any tests.

 
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