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/1609#issuecomment-337930499,https://api.github.com/repos/pydata/xarray/issues/1609,337930499,MDEyOklzc3VlQ29tbWVudDMzNzkzMDQ5OQ==,10050469,2017-10-19T14:43:48Z,2017-10-19T14:43:48Z,MEMBER,"Thanks! I like it: simple and in accordance with netcdf4's silent overwriting. It would be cool to describe this behavior this in the documentation somewhere, and add a test that the data is correctly overwritten maybe? ","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,262930380
https://github.com/pydata/xarray/pull/1609#issuecomment-335711382,https://api.github.com/repos/pydata/xarray/issues/1609,335711382,MDEyOklzc3VlQ29tbWVudDMzNTcxMTM4Mg==,10050469,2017-10-11T07:31:53Z,2017-10-11T07:31:53Z,MEMBER,"Netcdf4 would overwrite in this situation, and I am also in favor of overwriting as this could be quite a useful usecase:

```python
from netCDF4 import Dataset
with Dataset('test.nc', 'w', format='NETCDF4') as nc:
    nc.createDimension('lat', 1)
    nc.createVariable('lat', 'f4', ('lat',))
    nc['lat'][:] = 1
with Dataset(""test.nc"", ""a"") as nc:
    nc['lat'][:] = 2
```","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,262930380
https://github.com/pydata/xarray/pull/1609#issuecomment-335411346,https://api.github.com/repos/pydata/xarray/issues/1609,335411346,MDEyOklzc3VlQ29tbWVudDMzNTQxMTM0Ng==,10050469,2017-10-10T09:12:57Z,2017-10-10T09:12:57Z,MEMBER,"Thanks @jhamman !

With this fix existing variables will silently be ignored and won't be written, right? Maybe the expected behaviour (or specs) of the ""append"" option should be written somewhere in the docs and tested to avoid future regressions like we had in https://github.com/pydata/xarray/issues/1215","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,262930380