* navigable map is accomplished through the returned navigable map (or its views).
   *
   * <p>It is imperative that the user manually synchronize on the returned navigable map when
   * iterating over any of its collection views, or the collections views of any of its {@code
   * descendingMap}, {@code subMap}, {@code headMap} or {@code tailMap} views.
   *
   * <pre>{@code

	// sets the bucket policy using the policy statement generated from `getWriteOnlyObjectStatement` so that the
	// unsigned request goes through and its validated again.
	ExecObjectLayerAPIAnonTest(t, obj, "TestAPIHeadObjectHandler", bucketName, objectName, instanceType, apiRouter, anonReq, getAnonReadOnlyObjectPolicy(bucketName, objectName))

	}

	var chStorageClass bool
	if dstSc != "" && dstSc != srcInfo.StorageClass {
		chStorageClass = true
		srcInfo.metadataOnly = false
	} // no changes in storage-class expected so its a metadataonly operation.

	var reader io.Reader = gr

	// Set the actual size to the compressed/decrypted size if encrypted.
	actualSize, err := srcInfo.GetActualSize()
	if err != nil {

	peers := make(map[string]madmin.PeerInfo, len(arg.Peers))
	for dID, pi := range arg.Peers {
		if c.state.Peers != nil {
			if existingPeer, ok := c.state.Peers[dID]; ok {
				// retain existing ReplicateILMExpiry of peer if its already set
				// and incoming arg has it false. it could be default false
				if !pi.ReplicateILMExpiry && existingPeer.ReplicateILMExpiry {
					pi.ReplicateILMExpiry = existingPeer.ReplicateILMExpiry
				}
			}

					Drives:   anonymizeDrives(server.Disks),
					PoolNumber: func() int {
						if len(server.PoolNumbers) == 1 {
							return server.PoolNumbers[0]
						}
						return math.MaxInt // this indicates that its unset.
					}(),
					PoolNumbers: server.PoolNumbers,
					MemStats: madmin.MemStats{
						Alloc:      server.MemStats.Alloc,
						TotalAlloc: server.MemStats.TotalAlloc,

		}
		uploadedParts = append(uploadedParts, minio.CompletePart{
			PartNumber: pInfo.PartNumber,
			ETag:       pInfo.ETag,
		})
	}

	// really big value but its okay on heavily loaded systems. This is just tail end timeout.
	cctx, ccancel := context.WithTimeout(ctx, 10*time.Minute)
	defer ccancel()