trie.Node type is not compatible with rlp.Extended though used in encode_node

[ClementWalter]

Metadata

• Hardfork: cancun

What was wrong?

The encode_node function signature is def encode_node(node: Node, storage_root: Optional[Bytes] = None) -> Bytes: with

Node = Union[
    Account, Bytes, LegacyTransaction, Receipt, Uint, U256, Withdrawal, None
]

The None in the Node definition makes it incompatible with the rlp.Extended type used in the body in rlp.encode(node).

Either Extended should have Optional or Node not have None.

See https://github.com/ethereum/execution-specs/blob/master/src/ethereum/cancun/trie.py#L154-L168