[#972] pilorama: Remove removeDuplicatesInPlace()

Also, check that slices.CompareFunc() indeed passes all the tests before
removal.

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>

pkg/local_object_storage/pilorama/batch.go

@@ -2,6 +2,7 @@ package pilorama
 
 import (
 	"encoding/binary"
+	"slices"
 	"sort"
 	"sync"
 	"time"
@@ -50,7 +51,7 @@ func (b *batch) run() {
 		sort.Slice(b.operations, func(i, j int) bool {
 			return b.operations[i].Time < b.operations[j].Time
 		})
-		b.operations = removeDuplicatesInPlace(b.operations)
+		b.operations = slices.CompactFunc(b.operations, func(x, y *Move) bool { return x.Time == y.Time })
 
 		// Our main use-case is addition of new items. In this case,
 		// we do not need to perform undo()/redo(), just do().
@@ -115,15 +116,3 @@ func (b *batch) run() {
 		b.results[i] <- err
 	}
 }
-
-func removeDuplicatesInPlace(a []*Move) []*Move {
-	equalCount := 0
-	for i := 1; i < len(a); i++ {
-		if a[i].Time == a[i-1].Time {
-			equalCount++
-		} else {
-			a[i-equalCount] = a[i]
-		}
-	}
-	return a[:len(a)-equalCount]
-}