issue_comments: 499958420

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https://github.com/pydata/xarray/issues/3004#issuecomment-499958420 https://api.github.com/repos/pydata/xarray/issues/3004 499958420 MDEyOklzc3VlQ29tbWVudDQ5OTk1ODQyMA== 21049064 2019-06-07T16:50:36Z 2019-06-07T16:50:36Z NONE

Why does the number of bin labels have to be one less than the number of bins?

``` bin_labels = ['20', '40', '60', '80', '100'] decile_index_gpby = rank_norm.groupby_bins('rank_norm', bins=bins, labels=bin_labels)

Out[]: ValueError: Bin labels must be one fewer than the number of bin edges ```

 
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