from decimal import ROUND_HALF_UP, Decimal

HUNDRED = Decimal("100")
ZERO = Decimal("0")
TWO_PLACES = Decimal("0.01")


def clamp(value: Decimal) -> Decimal:
    return min(HUNDRED, max(ZERO, value))


def round_score(value: Decimal) -> Decimal:
    return value.quantize(TWO_PLACES, rounding=ROUND_HALF_UP)


def as_decimal(value: object) -> Decimal:
    if isinstance(value, Decimal):
        return value
    if isinstance(value, bool) or value is None:
        raise TypeError("value is not numeric")
    return Decimal(str(value))