class AnswerWithEvidence(BaseModel):
    answer: str = Field(...)

    start_page_num: int | None
    start_line_num: int | None
    end_page_num: int | None
    end_line_num: int | None

    confidence: float = Field(..., ge=0.0, le=1.0)
    justification: str = Field(...)

    quotes: list[str] = Field(default_factory=list)
    caveats: list[str] = Field(default_factory=list)