[Python] Optional field in Pydantic v2

The following code is expected to fail with bs "Field required". But how can I change class A to make the field bs optional and not just the value of bs? I'm using v2.11.5.

from typing import Optional, TypedDict, List
from pydantic import TypeAdapter

class B(TypedDict):
number: int

class A(TypedDict):
name: str
value: int
bs: Optional[List] = None

data_with_list = {
"name":"alfa",
"value":1,
"bs" :
[
{"number":1001},
{"number":1002}
]
}

data_with_empty_list = {
"name":"beta",
"value":2,
"bs" :
[
{"number":1003},
{"number":1004}
]
}

data_with_no_list = {
"name":"gamma",
"value":3,
}

ta = TypeAdapter(A)
ta.validate_python(data_with_list)
ta.validate_python(data_with_empty_list)
ta.validate_python(data_with_no_list)

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