code: @Nonnull
    @ReturnsMutableCopy
    public static byte [] decode (@Nonnull final String s) throws IOException
    {
      return decode (s, NO_OPTIONS);
    }
docs: Decodes data from Base64 notation, automatically detecting gzip-compressed
  data and decompressing it.
  
  @param s
  the string to decode
  @return the decoded data
  @throws IOException
  If there is a problem
  @since 1.4