id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,active_lock_reason,draft,pull_request,body,reactions,performed_via_github_app,state_reason,repo,type
847014702,MDU6SXNzdWU4NDcwMTQ3MDI=,5098,open_dataset regression,2448579,closed,0,35919497,,2,2021-03-31T17:32:03Z,2021-04-15T12:11:34Z,2021-04-15T12:11:34Z,MEMBER,,,,"<!-- Please include a self-contained copy-pastable example that generates the issue if possible.

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**What happened**:

`open_dataset` doesn't replace `~` any more

**What you expected to happen**:

should replace `~` for backward compatibility

**Minimal Complete Verifiable Example**:

```python
import xarray as xr

da = xr.DataArray([1, 2, 3])
da.to_netcdf(""~/bug_report.nc"")

xr.open_dataarray(""~/bug_report.nc"")
```

**Anything else we need to know?**:
works on 0.17.0, fails on master
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