docs: public static String join(long[] array, CharSequence conjunction) {
  		if (null == array) {
  			return null;
  		}
  
  		final StringBuilder sb = new StringBuilder();
  		boolean isFirst = true;
  		for (long item : array) {
  			if (isFirst) {
  				isFirst = false;
  			} else {
  				sb.append(conjunction);
  			}
  			sb.append(item);
  		}
  		return sb.toString();
  	}