如何在Go Ethereum中解析负int256？Uniswap V3交易问题

有一笔Uniswap V3交易，其最后一条事件日志为Swap事件：

注：该事件中amount1参数为负int256类型，但通过Go Ethereum解析后，它被转换为值为115792089237316195423570985008687907853269984665640564039457584007912291757879的正*big.Int类型。

我的实现代码如下：

swapEventData := common.Hex2Bytes("00000000000000000000000000000000000000000000000009f965b8bbc411b4ffffffffffffffffffffffffffffffffffffffffffffffffffffffffce0eef37000000000000000000000000000000000000000000023cfa4df1b921f8694c5300000000000000000000000000000000000000000000000017f67963eb5bc09bfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffcdc78")

tokenAbi, err := abi.JSON(strings.NewReader(string(contracts.V3PoolMetaData.ABI)))
if err != nil {
    panic(err)
}

unpack, err := tokenAbi.Unpack("Swap", swapEventData)

amount2 := unpack[1].(*big.Int)
fmt.Println(amount2)

内容的提问来源于stack exchange，提问作者Moon soon