The following code shows a pylance (pyright) error for AModel() of Argument missing for parameter "field_b":

from pydantic import BaseModel, Field
from typing import Optional, Any

class AModel(BaseModel):
   field_a: str = Field()
   field_b: Optional[bool] = Field(None)

instance_1 = AModel(field_a="", field_b=None)  # No error
instance_2 = AModel(field_a="")  # Error
#            ^^^^^^^^^^^^^^^^^^

kwargs: dict[str, Any] = {"field_a": "", "field_bad": True}
instance_3 = AModel(**kwargs)  # No error but no type checking

Is it possible to instantiate this model without providing field_b=None and whilst retaining type checking?