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