04-oracles.md fails to mention the Cumulative price is in UQ112 format and how to parse the number.

[zimmah]

It took quite some effort to figure out how to parse the number into something sensible.

The article makes it seem like when you calculate (price0CumulativeLast2 - price0CumulativeLast1) / (timestamp2 - timestamp1) you will get the price of token 0 in terms of token 1 as an integer.

This is however not the case, and instead you get back an UQ112 representation, which you then need to divide by 2**(112-Math.log2(1e18)) or alternatively divide by 2**(112)/1e18.

This is not at all clear from reading the guide.

Note: I assume the 18 is only because of the token having 18 decimals. So in fact it should probably be 2**(112-Math.log2(10**d)) where d is the number of decimals the token has.