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/861#issuecomment-221732500,https://api.github.com/repos/pydata/xarray/issues/861,221732500,MDEyOklzc3VlQ29tbWVudDIyMTczMjUwMA==,5635139,2016-05-25T22:57:41Z,2016-05-25T22:57:41Z,MEMBER,"Nice catch.

Or wrap `isnull` so it works throughout the code base? This is the function from pandas:

``` python
In [19]: from pandas.core.common import _isnull

In [20]: _isnull??
Signature: _isnull(obj)
Source:
def _isnull_new(obj):
    if lib.isscalar(obj):
        return lib.checknull(obj)
    # hack (for now) because MI registers as ndarray
    elif isinstance(obj, pd.MultiIndex):
        raise NotImplementedError(""isnull is not defined for MultiIndex"")
    elif isinstance(obj, (gt.ABCSeries, np.ndarray, pd.Index)):
        return _isnull_ndarraylike(obj)
    elif isinstance(obj, gt.ABCGeneric):
        return obj._constructor(obj._data.isnull(func=isnull))
    elif isinstance(obj, list) or hasattr(obj, '__array__'):
        return _isnull_ndarraylike(np.asarray(obj))
    else:
        return obj is None

File:      ~/drive/workspace/pandas3/pandas/core/common.py
Type:      function
```
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