mint- Credit tokens to an address. Requires minter role only granted to system module to allow for deficit auction to repay system bad debts.
burn- Destroys token of the sender. Used by system module to destroy tokens bought in the surplus auction to distribute stability fees to all BLU holders.
upgradeTo- Upgrades the UUPS contract to a new implementation. Requires upgrader role only granted to timelock/governance contract for upgrading functionalities of the token.