issue_comments: 503675891

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https://github.com/pydata/xarray/issues/3032#issuecomment-503675891 https://api.github.com/repos/pydata/xarray/issues/3032 503675891 MDEyOklzc3VlQ29tbWVudDUwMzY3NTg5MQ== 23738400 2019-06-19T18:25:14Z 2019-06-19T18:25:14Z CONTRIBUTOR

I'm trying to think whether there would be any performance cost there - i.e. are there any arrays where preemptive broadcasting would be both expensive and unnecessary?

Even if there were a performance cost (compared to the actual behaviour), it could be easily avoided by using all dims as input_core_dims couldn't it? IIUC, all dims should be broadcasted unless they are in input core dims, so it broadcasting could still be avoided without problem.

 
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