OptionalaccountThe account that would open the Trove. Supply it whenever you have it (MK-067, MK-106).
The borrowing fee is skipped entirely for a fee exempt account
(BorrowerOperations.sol:637-643), and the exempt cohort is NOT empty on mainnet, so for
such a caller the largest valid draw is LARGER than the one this returns without it.
Omitted, the calculation assumes the account is not exempt, exactly as
previewOpen does with the same absence. useBorrowingPower supplies the connected
wallet when the caller does not.
It has no effect in Recovery Mode, where the fee is skipped for everyone and the mode is read from the chain rather than from this parameter.
OptionalpriceOverride the price; defaults to fetchPrice().
Inputs to MusdClient.getBorrowingPower: the collateral to size a draw against.