Why overflows are desired in the UniswapV2OracleLibrary contract?

[RoseRompkxm]

I've noticed there are comments for the following code saying addition overflow is desired & subtraction overflow is desired, what's the purpose behind? Can anyone enlighten me this? Thanks a lot!

https://github.com/Uniswap/v2-periphery/blob/master/contracts/libraries/UniswapV2OracleLibrary.sol#L28

[jukanntenn]

This answer from stackoverflow gives a good explanation. I guess overflow do not change the final result, but I have't play this math game.