* @since 15.0 (in 14.0 with return type {@link BufferedOutputStream})
   */
  public OutputStream openBufferedStream() throws IOException {
    OutputStream out = openStream();
    return (out instanceof BufferedOutputStream)
        ? (BufferedOutputStream) out
        : new BufferedOutputStream(out);
  }

  /**
   * Writes all the given bytes to this sink.
   *