Fuzz against a Rust-based math library

[PaulRBerg]

It is not possible to write fuzz tests without a baseline against which to compare the test values. There are two possible solutions for this:

1. Fuzz against another Solidity math library
2. Fuzz against a math library written in another programming language

The issue with 1 is that there is no other Solidity math library that has all the functions that PRBMath has. Furthermore, I'm not aware of any other Solidity library with more tests than PRBMath. If I am to fuzz against a third-party, I would rather do it against a library that is battle-tested from a testing perspective.

The proper solution seems to be 2, whereby I use the ffi cheatcode and test against a Rust-based fixed-point math library such as fixed.

More research needed on this.