THE SMART TRICK OF BRIDGE BASE LOGIN THAT NOBODY IS DISCUSSING

The most typical configuration is to have L1 given that the layer of initial mint, and L2 as the bridged layer, this allows for ERC-20 contracts that were written without any knowledge of Mantle Mainnet for being bridged. The agreement on the bridged layer needs to employ the legacy IL2StandardERC20 interface (provided that the bridged layer is L2)