code: public int optInt(int index, int fallback) {
  		Object object = opt(index);
  		Integer result = JSON.toInteger(object);
  		return result != null ? result : fallback;
  	}
docs: Returns the value at {@code index} if it exists and is an int or can be coerced to
  an int. Returns {@code fallback} otherwise.
  @param index the index to get the value from
  @param fallback the fallback value
  @return the value at {@code index} of {@code fallback}