def is_(self, other):
<EOL>return self._id is getattr(<EOL>other, '<STR_LIT>', Ellipsis) and self._id is not None<EOL>
More flexible, faster check like ``is`` but that works through views.

Note: this is *not* the same as ``Index.identical()``, which checks
that metadata is also the same.

Parameters
----------
other : object
    other object to compare against.

Returns
-------
True if both have same underlying data, False otherwise : bool