pointsWeight[nomineeHash][nextTime].bias = _maxAndSub(_getWeight(account, chainId) + newBias, oldBias);
pointsSum[nextTime].bias = _maxAndSub(_getSum() + newBias, oldBias);
if (oldSlope.end > nextTime) {
    pointsWeight[nomineeHash][nextTime].slope =
        _maxAndSub(pointsWeight[nomineeHash][nextTime].slope + newSlope.slope, oldSlope.slope);
    pointsSum[nextTime].slope = _maxAndSub(pointsSum[nextTime].slope + newSlope.slope, oldSlope.slope);
} else {
    pointsWeight[nomineeHash][nextTime].slope += newSlope.slope;
    pointsSum[nextTime].slope += newSlope.slope;
}
function _getSum() internal returns (uint256) {
    // t is always > 0 as it is set in the constructor
    uint256 t = timeSum;
    Point memory pt = pointsSum[t];
    for (uint256 i = 0; i < MAX_NUM_WEEKS; i++) {
        if (t > block.timestamp) {
            break;
        }
        t += WEEK;
        uint256 dBias = pt.slope * WEEK;
        if (pt.bias > dBias) {
            pt.bias -= dBias;
            uint256 dSlope = changesSum[t];
            pt.slope -= dSlope;
        } else {
            pt.bias = 0;
            pt.slope = 0;
        }

        pointsSum[t] = pt;
        if (t > block.timestamp) {
            timeSum = t;
        }
    }
    return pt.bias;
}
