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/1463#issuecomment-509445160,https://api.github.com/repos/pydata/xarray/issues/1463,509445160,MDEyOklzc3VlQ29tbWVudDUwOTQ0NTE2MA==,5635139,2019-07-09T00:54:02Z,2019-07-09T01:05:53Z,MEMBER,"This is fixed! It's not allowing *attrs* to be passed into `_replace`. ~I'll open a new issue~ I think that's OK, since `attrs` are on the variable rather than the DataArray","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,237807730
https://github.com/pydata/xarray/issues/1463#issuecomment-509444525,https://api.github.com/repos/pydata/xarray/issues/1463,509444525,MDEyOklzc3VlQ29tbWVudDUwOTQ0NDUyNQ==,1217238,2019-07-09T00:49:48Z,2019-07-09T00:50:09Z,MEMBER,I think this was fixed by https://github.com/pydata/xarray/pull/2936. Certainly I can't reproduce the example in the first comment here any more.,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,237807730
https://github.com/pydata/xarray/issues/1463#issuecomment-509319403,https://api.github.com/repos/pydata/xarray/issues/1463,509319403,MDEyOklzc3VlQ29tbWVudDUwOTMxOTQwMw==,5635139,2019-07-08T17:30:17Z,2019-07-08T17:30:17Z,MEMBER,"This also doesn't work for `._replace`:  https://github.com/pydata/xarray/blob/master/xarray/core/dataarray.py#L296

So my comment here isn't really correct: https://github.com/pydata/xarray/pull/3086#discussion_r301211375

@pletchm should I have a go at a PR? Happy to take this and you can take another one; I have lots of time atm","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,237807730
https://github.com/pydata/xarray/issues/1463#issuecomment-482732837,https://api.github.com/repos/pydata/xarray/issues/1463,482732837,MDEyOklzc3VlQ29tbWVudDQ4MjczMjgzNw==,5635139,2019-04-12T21:44:52Z,2019-04-12T21:44:52Z,MEMBER,Great @pletchm ! This is a example of a recent similar issue: https://github.com/pydata/xarray/pull/2839/files,"{""total_count"": 1, ""+1"": 1, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,237807730
https://github.com/pydata/xarray/issues/1463#issuecomment-482701114,https://api.github.com/repos/pydata/xarray/issues/1463,482701114,MDEyOklzc3VlQ29tbWVudDQ4MjcwMTExNA==,2448579,2019-04-12T19:50:29Z,2019-04-12T19:50:29Z,MEMBER,"go for it! @pletchm .

Feel free to open a PR or ask questions if you need help.","{""total_count"": 1, ""+1"": 1, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,237807730
https://github.com/pydata/xarray/issues/1463#issuecomment-340454702,https://api.github.com/repos/pydata/xarray/issues/1463,340454702,MDEyOklzc3VlQ29tbWVudDM0MDQ1NDcwMg==,6815844,2017-10-30T14:08:08Z,2017-10-30T14:08:08Z,MEMBER,"We do not allow to assign value in `IndexVariable` as `pandas.Index` is immutable (assigning value raises a `TypeError`),
but we can actually do this from `.data` attribute ([this line](https://github.com/pydata/xarray/blob/master/xarray/core/variable.py#L1422)).
(Our `IndexVariable` is not immutable...)

I think we should copy also `IndexVariable` not keeping the original reference.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,237807730
https://github.com/pydata/xarray/issues/1463#issuecomment-310489331,https://api.github.com/repos/pydata/xarray/issues/1463,310489331,MDEyOklzc3VlQ29tbWVudDMxMDQ4OTMzMQ==,1217238,2017-06-22T20:12:10Z,2017-06-22T20:12:10Z,MEMBER,"This seems like a bug.

I suspect the problem is in `Variable.copy` on [these lines](https://github.com/pydata/xarray/blob/22ff955d53e253071f6e4fa849e5291d0005282a/xarray/core/variable.py#L467-L469) (which should probably just be removed). Coordinates store their data in `pandas.Index` objects, which are supposed to be immutable. But apparently that's not necessarily the case.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,237807730