code: def _linemagic(cls, options, strict=False, backend=None):
          "Deprecated, not expected to be used by any current code"
          backends = None if backend is None else [backend]
          options, failure = cls._process_magic(options, strict, backends=backends)
          if failure: return
          with options_policy(skip_invalid=True, warn_on_skip=False):
              StoreOptions.apply_customizations(options, Store.options(backend=backend)f _linemagic(cls, options, strict=False, backend=None):
          "Deprecated, not expected to be used by any current code"
          backends = None if backend is None else [backend]
          options, failure = cls._process_magic(options, strict, backends=backends)
          if failure: return
          with options_policy(skip_invalid=True, warn_on_skip=False):
              StoreOptions.apply_customizations(options, Store.options(backend=backend))
docs: Deprecated, not expected to be used by any current code