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Possible fix to avoid four cases of divisions by zero:
return state.validator_registry[index].effective_balance // adjusted_quotient // BASE_REWARDS_PER_EPOCH
rewards[index] += get_base_reward(state, index) * attesting_balance // total_balance
validator.effective_balance * min(total_penalties * 3, total_balance) // total_balance
rewards[index] += base_reward * attesting_balance // committee_balance
See also #1107.