fix unconvert issues: unnecessary conversion

chunkenc/xor.go

@@ -259,7 +259,7 @@ func (it *xorIterator) Next() bool {
 			it.err = err
 			return false
 		}
-		it.t = int64(t)
+		it.t = t
 		it.val = math.Float64frombits(v)
 
 		it.numRead++

chunks/chunks.go

@@ -349,7 +349,7 @@ func (s *Reader) Chunk(ref uint64) (chunkenc.Chunk, error) {
 	}
 	b := s.bs[seq]
 
-	if int(off) >= b.Len() {
+	if off >= b.Len() {
 		return nil, errors.Errorf("offset %d beyond data size %d", off, b.Len())
 	}
 	// With the minimum chunk length this should never cause us reading

db.go

@@ -737,7 +737,7 @@ func (db *DB) CleanTombstones() error {
 	defer db.cmtx.Unlock()
 
 	start := time.Now()
-	defer db.metrics.tombCleanTimer.Observe(float64(time.Since(start).Seconds()))
+	defer db.metrics.tombCleanTimer.Observe(time.Since(start).Seconds())
 
 	db.mtx.RLock()
 	blocks := db.blocks[:]

index/index.go

@@ -780,7 +780,7 @@ func (r *Reader) readSymbols(off int) error {
 
 	for d.err() == nil && d.len() > 0 && cnt > 0 {
 		s := d.uvarintStr()
-		r.symbols[uint32(nextPos)] = s
+		r.symbols[nextPos] = s
 
 		if r.version == 2 {
 			nextPos++
@@ -800,7 +800,7 @@ func (r *Reader) readOffsetTable(off uint64, f func([]string, uint64) error) err
 	cnt := d.be32()
 
 	for d.err() == nil && d.len() > 0 && cnt > 0 {
-		keyCount := int(d.uvarint())
+		keyCount := d.uvarint()
 		keys := make([]string, 0, keyCount)
 
 		for i := 0; i < keyCount; i++ {
@@ -1038,7 +1038,7 @@ func (dec *Decoder) Series(b []byte, lbls *labels.Labels, chks *[]chunks.Meta) e
 
 	d := decbuf{b: b}
 
-	k := int(d.uvarint())
+	k := d.uvarint()
 
 	for i := 0; i < k; i++ {
 		lno := uint32(d.uvarint())
@@ -1061,7 +1061,7 @@ func (dec *Decoder) Series(b []byte, lbls *labels.Labels, chks *[]chunks.Meta) e
 	}
 
 	// Read the chunks meta data.
-	k = int(d.uvarint())
+	k = d.uvarint()
 
 	if k == 0 {
 		return nil