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Borrow & round up division #70
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At the moment, when an account borrows from Red Bank, given the nature of integers, the amount they owe is rounded down to the nearest unit. While this likely is not an issue (gas expense to exploit is too high), we should err on rounding in favor of the pool and not the individual.
This also is consistent to how it's handled in Red Bank: https://github.com/mars-protocol/outposts/blob/master/contracts/red-bank/src/interest_rates.rs#L60-L70