add comment for removing zeros

processor/deltatocumulativeprocessor/internal/data/expo/merge.go

@@ -22,6 +22,9 @@ func Merge(arel, brel Buckets) {
 
 	lo := min(a.Lower(), b.Lower())
 	up := max(a.Upper(), b.Upper())
+
+	// Skip leading and trailing zeros to reduce number of buckets.
+	// As we cap number of buckets this allows us to have higher scale.
 	for lo < up && a.Abs(lo) == 0 && b.Abs(lo) == 0 {
 		lo++
 	}