TraderJoe v2 fee overcharge

gistfile1.txt

    function test_getFeeAmount() public {
        // Configuration was copied from BTC.b/USDC pair
        bytes32 params;
        uint16 binStep = 10;

        params = params.setStaticFeeParameters(10000, 30, 600, 5000, 40000, 1000, 350000);
        // Set volatility accumulator to the max
        params = params.setVolatilityAccumulator(350000);

        // 5900000000000000 => 0.59%
        console2.log("Total fee %s", totalFee);

        uint128 totalFee = params.getTotalFee(binStep);
        uint128 inAmount = 1234567;

        uint128 feeAmount = inAmount.getFeeAmount(totalFee);

        // feeAmount = 7328. However, Math.ceil(1234567 * 0.0059) = 7284. Extra 44 wei has been charged
        console.log("Fee amount %s", feeAmount);
    }