Function percent 

pub fn percent(covered: u32, total: u32) -> u32

Coverage percentage of covered/total, rounded; total == 0 → 100. Only a genuinely complete run reads 100%: round-half-up would report 995/1000 as 100% while lines are still uncovered — self-contradicting in the table and a false green for a CI gate keyed on the JSON percent — so a run with any uncovered line is clamped to at most 99.