FloatingPointOperations.sol: Incorrect equality function

[hra687261]

In the FPO library in FloatingPointOperations.sol:

everscalend-contracts/smart-contracts/src/utils/libraries/FloatingPointOperations.sol

Lines 53 to 55 in 8d24e26

	function eq(fraction a, fraction b) internal pure returns(bool) {
	return ((a.nom == b.nom) && (a.denom == b.denom));
	}

This equality function that checks if two fractions are equal is incorrect since it doesn't normalize the fractions before checking the equality.
Therefore, this function will return false if it is called on fraction(1,2) and fraction(2,4) while they are equal.
Also, after normalizing the fractions, the function should start by checking if the denominators are equal, that way, if they aren't, it won't be necessary to check if the numerators are equal, since the fraction will definitely not be equal.
There is also a warning from the TON-Solidity-Compiler that says that library functions should have default mutability.