'Marks an ``Item`` instance as no longer needing to be saved.
Example:
>>> user.needs_save()
False
>>> user[\'first_name\'] = \'Johann\'
>>> user.needs_save()
True
>>> user.mark_clean()
>>> user.needs_save()
False'

def mark_clean(self):

    self._orig_data = deepcopy(self._data)
