In contracts/mixins/shared/Constants.sol we have 3 gas limit constants:
These numbers are not future-proof as some hardforks introduce changes to gas costs. These potential future changes to gas costs might break some of the functionalities of the smart contracts that use these constants. This is something to keep in mind. If some hardfork, would break a smart contract using these numbers you would need to deploy new contracts with adjusted gas limit constants. Or you can also have these gas limits be mutable by admins on-chain. For example, all 3 of these values can be stored on-chain in 1 storage slot.
