docs: public static String encodeBase62(final long num) {
  		long index = Math.abs(num);
  		int base = BASE62.length();
  		StringBuilder sb = new StringBuilder();
  		for (; index > 0; index /= base) {
  			sb.append(BASE62.charAt((int) (index % base)));
  		}
  
  		return sb.toString();
  	}