issue_comments: 233796557

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https://github.com/pydata/xarray/issues/906#issuecomment-233796557 https://api.github.com/repos/pydata/xarray/issues/906 233796557 MDEyOklzc3VlQ29tbWVudDIzMzc5NjU1Nw== 1217238 2016-07-19T23:26:33Z 2016-07-19T23:26:33Z MEMBER

What behavior would you suggest as an alternative? I suppose that in principle we could assign new levels based on order of appearance (and treat levels as an implementation detail), but it's worth noting that this behavior for unstack() matches how pandas works:

```

s.unstack() count first fourth second third x
x0 4 7 5 6 x1 0 3 1 2 ```

 
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