Inconsistent Agent State Definitions: is_last_step Missing in AgentStatePydantic

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#.venv/lib/python3.13/site-packages/langgraph/prebuilt/chat_agent_executor.py
class AgentState(TypedDict):
"""The state of the agent."""

messages: Annotated[Sequence[BaseMessage], add_messages]

is_last_step: IsLastStep

remaining_steps: RemainingSteps

#TODO: Why does this not have is_last_step?
class AgentStatePydantic(BaseModel):
"""The state of the agent."""

messages: Annotated[Sequence[BaseMessage], add_messages]

remaining_steps: RemainingSteps = 25