#51 breaks backwards compatibility before 0.8.0

[ernestognw]

Description

Recently #51 was merged and it included an unchecked in the stdMath.abs function, which requires to bump the Solidity version for the forge-std package to be pragma solidity >=0.8.0 <0.9.0; instead of pragma solidity >=0.6.0 <0.9.0;

I'm myself running into an issue here since I wanted to test a 0.6.0 contract and this was broken. You either will need to remove the unchecked or bump the version.

[mds1]

Great catch, thanks! Seems we can just change the abs method to return a >= 0 ? a : -a; and be all set? I can get a PR open for that tomorrow unless you want to beat me to it.

@ZeroEkkusu We should probably update the CI to run against a few different solc versions, since this has happened before

[OliverNChalk]

If you don't have unchecked, the following will fail:

int256 inverse = -(type(int256).min)

[ernestognw]

If you don't have unchecked, the following will fail:

int256 inverse = -(type(int256).min)

This is correct.
Here's my 20 wei (#54)

[OliverNChalk]

Assuming we don't want to raise the minimum solidity version, I'm leaning towards #54