issue_comments: 431864845

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https://github.com/pydata/xarray/issues/2496#issuecomment-431864845 https://api.github.com/repos/pydata/xarray/issues/2496 431864845 MDEyOklzc3VlQ29tbWVudDQzMTg2NDg0NQ== 1217238 2018-10-22T15:14:42Z 2018-10-22T15:14:42Z MEMBER

I suppose we could use MultiIndex.remove_unused_levels() when unstacking -- this appears to be what pandas does: ```

df2.unstack() cols col idx2 x y z idx1 a -1.470914 -0.093633 1.211639 b 0.587716 1.425005 0.106892 ```

I'll mark this as a bug, though it's also a bit of a backwards incompatible change. Any interest in putting together a PR? :)

 
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