Function compare_benchmark_aggregates 

pub fn compare_benchmark_aggregates(
    current: &[BenchmarkAggregateRow],
    previous: &[BenchmarkAggregateRow],
    scale: u64,
) -> Result<Vec<BenchmarkComparisonRow>, BenchmarkComparisonError>

Pair current and previous means at the same caller-selected scale.

Errors

Returns a typed error for duplicate scope/span rows on either side or an invalid mean.