[Certora] SumOfCredits equals TotalUnits plus Fees.#1063
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This is the main solvency invariant: the totalUnits equals the correctly scaled sums of all position credit plus fee. Together with the invariant from Midnight.spec that totalUnits equals the sum of all debts plus the withdrawable amount, this shows that all credits are backed by debt.
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This is the main solvency invariant: the totalUnits equals the correctly scaled sums of all position credit plus fee. Together with the invariant from Midnight.spec that totalUnits equals the sum of all debts plus the withdrawable amount, this shows that all credits are backed by debt.
This pull-request superseeds #534.