issue_comments: 448817147

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https://github.com/pydata/xarray/pull/2621#issuecomment-448817147 https://api.github.com/repos/pydata/xarray/issues/2621 448817147 MDEyOklzc3VlQ29tbWVudDQ0ODgxNzE0Nw== 1217238 2018-12-20T01:07:27Z 2018-12-20T01:07:27Z MEMBER

This issue does not matter only in unstack but also in sel (reindex also?).

Can you explain why matters for .sel()? I guess it slows down repeated indexing?

My inclination was just to copy what pandas does (which is only removing unused levels in unstack)

 
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