Variable multiply`Const`

multiply: Scale & LeftScale & {
    (
        left: ReadonlyValue<Transform>,
        right: ReadonlyValue<Transform>,
    ): Transform;
    (left: ReadonlyValue<Transform>, right: ReadonlyValue<Vector2f>): Vector2f;
    (left: ReadonlyValue<Color>, right: ReadonlyValue<Color>): Color;
} = ...

返回标量缩放、变换组合或点变换的新对象；Color 按通道相乘再除以 255。