code: def __setitem__(self, key: Any, value: Any) -> None:
      self._check_if_crashed()
      value = super().__setitem__(key, value)
      return value
  
imports: from typing import Any
  from typing import Type
  from syft.serde.serializable import serializable
  from syft.store.document_store import DocumentStore
  from syft.store.document_store import PartitionSettings
  from syft.store.document_store import StoreConfig
  from syft.store.kv_document_store import KeyValueBackingStore
  from syft.types.syft_object import SyftObject
  from syft.types.uid import UID
label_desc: Use image node_id 3 for calling the MockKeyValueBackingStore obj's underlying member method code with example usage: obj.__setitem__(key, value) and returns: value