dt["a"] = xr.DataArray(0)

dt["a"] = 0

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
Input In [9], in <cell line: 1>()
----> 1 dt["a"] = 0

File ~/Documents/Work/Code/datatree/datatree/datatree.py:704, in DataTree.__setitem__(self, key, value)
    700 elif isinstance(key, str):
    701     # TODO should possibly deal with hashables in general?
    702     # path-like: a name of a node/variable, or path to a node/variable
    703     path = NodePath(key)
--> 704     return self._set_item(path, value, new_nodes_along_path=True)
    705 else:
    706     raise ValueError("Invalid format for key")

File ~/Documents/Work/Code/datatree/datatree/treenode.py:444, in TreeNode._set_item(self, path, item, new_nodes_along_path, allow_overwrite)
    442         raise KeyError(f"Already a node object at path {path}")
    443 else:
--> 444     current_node._set(name, item)

File ~/Documents/Work/Code/datatree/datatree/datatree.py:684, in DataTree._set(self, key, val)
    682     self.update({key: val})
    683 else:
--> 684     raise TypeError(f"Type {type(val)} cannot be assigned to a DataTree")

TypeError: Type <class 'int'> cannot be assigned to a DataTree