issue_comments: 443044579

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https://github.com/pydata/xarray/issues/1603#issuecomment-443044579 https://api.github.com/repos/pydata/xarray/issues/1603 443044579 MDEyOklzc3VlQ29tbWVudDQ0MzA0NDU3OQ== 1217238 2018-11-30T00:24:39Z 2018-11-30T00:24:39Z MEMBER

I wonder if we should also change the default value of the append argument in set_index() to append=None, which means something like "append if creating a MultiIndex". For most users, keeping a single MultiIndex is the most usable way to use multiple indexes along a dimension, and our default behavior should reflect that.

 
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