code: public boolean getAsBooleanWithDefault(String key, boolean defaultValue) {
  		Object value = getAsObject(key);
  		return BooleanConverter.toBooleanWithDefault(value, defaultValue);
  	}
docs: Converts map element into a boolean or returns default value if conversion is
  not possible.
  
  @param key          a key of element to get.
  @param defaultValue the default value
  @return boolean value of the element or default value if conversion is not
  supported.
  
  @see BooleanConverter#toBooleanWithDefault(Object, boolean)