IndexPool: swap failing

[technicallyty]

Isolated test here: https://github.com/sushiswap/trident/blob/master/test/IndexPool.test.ts

IndexPool is currently failing on swap. The _getAmountOut function is returning an unexpectedly large number that causes an overflow when outRecord.amount is updated.

Also appears to be a logic error in the y value calculation - dividing tokenbalanceIn by itself

    function _getAmountOut(
        uint256 tokenBalanceIn,
        uint256 tokenWeightIn,
        uint256 tokenBalanceOut,
        uint256 tokenWeightOut,
        uint256 tokenAmountIn
    ) internal view returns (uint256 finalAmountOut) {
        uint256 weightRatio = tokenWeightIn / tokenWeightOut;
        uint256 adjustedIn = BASE - swapFee;
        adjustedIn = tokenAmountIn * adjustedIn;
        uint256 y = tokenBalanceIn / tokenBalanceIn + adjustedIn; // tokenBalanceIn/tokenBalancein ?
        uint256 foo = pow(y, weightRatio);
        uint256 bar = BASE - foo;
        finalAmountOut = tokenBalanceOut * bar;
    }

[Okavango]

fixed