docs: def where(self, attrs=None, first=False):
          """
          Convenience version of a common use case of `filter`:
          selecting only objects
          containing specific `key:value` pairs.
          """
          if attrs is None:
              return None if first is True else []
  
          method = _.find if first else _.filter
  
          def by(val, *args):
              for key, value in attrs.items():
                  try:
                      if attrs[key] != val[key]:
                          return False
                  except KeyError:
                      return False
                  return True
  
          return self._wrap(method(self.obj, by))