fixup! don't zero the zeroes

raft/quorum/majority.go

@@ -122,19 +122,16 @@ func (c MajorityConfig) CommittedIndex(l AckedIndexer) Index {
 
 	{
 		// Fill the slice with the indexes observed. Any unused slots will be
-		// zeroed; these correspond to voters that may report in, but haven't
-		// yet. We fill from the right (since the zeroes will end up on the left
-		// after sorting below anyway).
+		// left as zero; these correspond to voters that may report in, but
+		// haven't yet. We fill from the right (since the zeroes will end up on
+		// the left after sorting below anyway).
 		i := n - 1
 		for id := range c {
 			if idx, ok := l.AckedIndex(id); ok {
 				srt[i] = uint64(idx)
 				i--
 			}
 		}
-		for j := 0; j <= i; j++ {
-			srt[j] = 0
-		}
 	}
 
 	// Sort by index. Use a bespoke algorithm (copied from the stdlib's sort