Access request to feeGrowthOutside specs notion page

[junomonster]

perp-curie-contract/contracts/lib/Tick.sol

Lines 70 to 79 in f98ff08

	/// @return all values returned can underflow per feeGrowthOutside specs;
	/// see https://www.notion.so/32990980ba8b43859f6d2541722a739b
	function getAllFundingGrowth(
	mapping(int24 => GrowthInfo) storage self,
	int24 lowerTick,
	int24 upperTick,
	int24 currentTick,
	int256 twPremiumGrowthGlobalX96,
	int256 twPremiumDivBySqrtPriceGrowthGlobalX96
	) internal view returns (FundingGrowthRangeInfo memory) {

We're currently doing some uniswap v3/trident stuffs, accidentally we found some articles about the uniswap's underflow issue.

According to this (Uniswap/v3-periphery#164), I assume that this is why perpetual team does not use safemath on the fee growth calculation logic.

However, I cannot understand that how the under/overflow situation occurs. To resolve this, I wanna get an access to that notion page.

Thanks.