error CeilingExceeded(uint256 newDebt, uint256 debtCeiling);
error UnsafePositionChange(uint256 newTotalDebtInVault, uint256 collateral, uint256 spot);
error UnsafePositionChangeWithoutConsent(uint8 ilkIndex, address user, address unconsentedOperator);
error GemTransferWithoutConsent(uint8 ilkIndex, address user, address unconsentedOperator);
error UseOfCollateralWithoutConsent(uint8 ilkIndex, address depositor, address unconsentedOperator);
error TakingWethWithoutConsent(address payer, address unconsentedOperator);