  BigBang test
    poc
userCollateralShare:  99999999
userCollateralShareToAmount:  0
collateralPart in asset times exchangerRate 749999992500000000
exchangeRate: 1000000000000000
can borrow this much: 749
748
       considers me solvent even when I have enough share for any amount PoCBorrow (12405ms)
        return
            yieldBox.toAmount(
                collateralId,
                collateralShare *
                    (EXCHANGE_RATE_PRECISION / FEE_PRECISION) *
                    collateralizationRate,
                false
            ) >=
        uint256 collateralPartInAsset = (yieldBox.toAmount(
            collateralId,
            userCollateralShare[user],
            false
        ) * EXCHANGE_RATE_PRECISION) / _exchangeRate;
    function _computeAssetAmountToSolvency(
        address user,
        uint256 _exchangeRate
    ) private view returns (uint256) {
        // accrue must have already been called!
        uint256 borrowPart = userBorrowPart[user];
        if (borrowPart == 0) return 0;
        uint256 collateralShare = userCollateralShare[user];

        Rebase memory _totalBorrow = totalBorrow;

        uint256 collateralAmountInAsset = yieldBox.toAmount(
            collateralId,
            (collateralShare *
                (EXCHANGE_RATE_PRECISION / FEE_PRECISION) *
                lqCollateralizationRate),
            false
        ) / _exchangeRate;
        // Obviously it's not `borrowPart` anymore but `borrowAmount`
        borrowPart = (borrowPart * _totalBorrow.elastic) / _totalBorrow.base;
