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/issues/2647#issuecomment-451504888,https://api.github.com/repos/pydata/xarray/issues/2647,451504888,MDEyOklzc3VlQ29tbWVudDQ1MTUwNDg4OA==,1217238,2019-01-04T17:06:30Z,2019-01-04T17:06:30Z,MEMBER,"I think `concat_dim=None` may mean something special here, which is why we have `_CONCAT_DIM_DEFAULT`","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,395994055
https://github.com/pydata/xarray/issues/2647#issuecomment-451502294,https://api.github.com/repos/pydata/xarray/issues/2647,451502294,MDEyOklzc3VlQ29tbWVudDQ1MTUwMjI5NA==,1217238,2019-01-04T16:57:33Z,2019-01-04T16:57:33Z,MEMBER,"Indeed, this is should definitely be `concat_dim is _CONCAT_DIM_DEFAULT` for comparing to a sentinel value.

I think this snuck through because NumPy will automatically cast size 1 arrays (of any shape) to booleans :(. We should probably adapt that test to include an explicit dimension of size greater than 1.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,395994055