html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,performed_via_github_app,issue
https://github.com/pydata/xarray/pull/749#issuecomment-181608305,https://api.github.com/repos/pydata/xarray/issues/749,181608305,MDEyOklzc3VlQ29tbWVudDE4MTYwODMwNQ==,2443309,2016-02-08T22:52:22Z,2016-02-08T22:52:22Z,MEMBER,"@shoyer - I don't remember which issue it was but I seem to remember implementing this on purpose. I think we were having trouble serializing and round-tripping with non string type labels.  Ring a bell? 
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