    function redeem(uint256 amount) external notFrozen {
...............
...............
        (address[] memory erc20s, uint256[] memory amounts) = basketHandler.quote(baskets, FLOOR);

        uint256 erc20length = erc20s.length;

        uint192 prorate = uint192((FIX_ONE_256 * amount) / supply);

        // Bound each withdrawal by the prorata share, in case we're currently under-collateralized
        for (uint256 i = 0; i < erc20length; ++i) {
            uint256 bal = IERC20Upgradeable(erc20s[i]).balanceOf(address(backingManager));

            uint256 prorata = (prorate > 0)
                ? (prorate * bal) / FIX_ONE // {qTok} = D18{1} * {qTok} / D18
                : mulDiv256(bal, amount, supply); // {qTok} = {qTok} * {qRTok} / {qRTok}

            if (prorata < amounts[i]) amounts[i] = prorata;
        }

        basketsNeeded = basketsNeeded_ - baskets;
        emit BasketsNeededChanged(basketsNeeded_, basketsNeeded);

        // == Interactions ==
        _burn(redeemer, amount);

        bool allZero = true;
        for (uint256 i = 0; i < erc20length; ++i) {
            if (amounts[i] == 0) continue;
            if (allZero) allZero = false;

            IERC20Upgradeable(erc20s[i]).safeTransferFrom(
                address(backingManager),
                redeemer,
                amounts[i]
            );
        }

        if (allZero) revert("Empty redemption");
    }
    function fullyCollateralized() external view returns (bool) {
        return basketsHeldBy(address(backingManager)) >= rToken.basketsNeeded();
    }
