RewardThrottle.checkRewardUnderflow() might track the cumulative APRs wrongly.

Lines of code Vulnerability details Impact RewardThrottle.checkRewardUnderflow might calculate the cumulative APRs for epochs wrongly. As a result, cashflowAverageApr will be calculated incorrectly in updateDesiredAPR, and targetAPR would be changed unexpectedly. Proof of Concept In...