issue_comments: 415099271

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https://github.com/pydata/xarray/pull/2375#issuecomment-415099271 https://api.github.com/repos/pydata/xarray/issues/2375 415099271 MDEyOklzc3VlQ29tbWVudDQxNTA5OTI3MQ== 4806877 2018-08-22T16:44:47Z 2018-08-22T17:46:24Z CONTRIBUTOR

we have similar method reset_index. Do we also want to make dim optional?

I don't have an opinion on that except to say that reset_index takes an iter of dims so it is at least slightly different. So to me it seems fine to only make dim optional on unstack.

 
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