gas optimization in modifiers

[Pfed-prog]

Modifiers code is copied in all instances where it's used, increasing bytecode size. By doing a refractor to the internal function, one can reduce bytecode size significantly at the cost of one JUMP. Consider doing this only if you are constrained by bytecode size.
https://0xmacro.com/blog/solidity-gas-optimizations-cheat-sheet/

[Pfed-prog]

    modifier onlyArbitrator() {
        _checkOwner();
        _;
    }

    function _checkOwner() internal view virtual {
        require(msg.sender == address(arbitrator), "Can only be called by the arbitrator.");
    }

reduces gas to 768341 in TalentLayerArbitrator

[0xRomain]

Good point, in this case, it doesn't change much and reduce code readability, but we can check this point in other cases