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