if (existing != null) return existing

    if (computed == null) {
      computed = compute()
    }

    // If we successfully add the computed element, we're done.
    val newTags = tags.plus(type, computed)
    if (compareAndSet(tags, newTags)) return computed

    // We lost the race. Possibly to other code that was putting a *different* key. Try again!
  }

				}
				if err := hr.Close(); err != nil {
					errs[idx] = err
				}
			}()

			userDefined := make(map[string]string, len(req.UserMetadata))
			maps.Copy(userDefined, req.UserMetadata)

			tgs, err := tags.NewTags(req.UserTags, true)
			if err != nil {
				errs[idx] = err
				return
			}

			userDefined[xhttp.AmzObjectTagging] = tgs.String()

			if opts.Kind != nil {