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   *
   * <p><b>Note:</b> Prior to Guava release 9.0, the default was 16. It is possible the default will
   * change again in the future. If you care about this value, you should always choose it
   * explicitly.
   *
   * @throws IllegalArgumentException if {@code concurrencyLevel} is nonpositive
   * @throws IllegalStateException if a concurrency level was already set
   */
  @CanIgnoreReturnValue

      reproduction, and distribution of the Work otherwise complies with
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// returns to the caller which dataDir to delete, also
// indicates if this is the last version.
func (x *xlMetaV2) DeleteVersion(fi FileInfo) (string, error) {
	// This is a situation where versionId is explicitly
	// specified as "null", as we do not save "null"
	// string it is considered empty. But empty also
	// means the version which matches will be purged.
	if fi.VersionID == nullVersionID {
		fi.VersionID = ""

      return delegate;
    }

    @Override
    public int size() {
      return delegate.size() + delta;
    }
  }

  @SuppressWarnings("JoinIterableIterator") // explicitly testing iterator overload, too
  public void testNoSpecialNullBehavior() {
    checkNoOutput(J, iterable);
    checkResult(J, iterable1, "1");
    checkResult(J, iterable12, "1-2");