docs: @NonNull
      public static String placeholders(final int numberOfPlaceholders) {
          if (numberOfPlaceholders == 1) {
              return "?"; // fffast
          } else if (numberOfPlaceholders == 0) {
              return "";
          } else if (numberOfPlaceholders < 0) {
              throw new IllegalArgumentException("numberOfPlaceholders must be >= 0, but was = " + numberOfPlaceholders);
          }
  
          final StringBuilder stringBuilder = new StringBuilder((numberOfPlaceholders * 2) - 1);
  
          for (int i = 0; i < numberOfPlaceholders; i++) {
              stringBuilder.append('?');
  
              if (i != numberOfPlaceholders - 1) {
                  stringBuilder.append(',');
              }
          }
  
          return stringBuilder.toString();
      }