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When should I use `require` vs custom `revert` errors?

like this: function withdraw() external { (bool success, ) = payable(msg.sender).call{value: address(this).balance}(""); // Now we should check the function succeeded } I could check this with: require … success){ revert TransferFailed();} Where does it make sense to use require vs a custom error and revert? It seems you'll just need to check the gas costs, and that's it. …