docs: public static Double getDouble(String propertyName, String envName, Double defaultValue) {
  		checkEnvName(envName);
  		Double propertyValue = NumberUtil.toDoubleObject(System.getProperty(propertyName), null);
  		if (propertyValue != null) {
  			return propertyValue;
  		} else {
  			propertyValue = NumberUtil.toDoubleObject(System.getenv(envName), null);
  			return propertyValue != null ? propertyValue : defaultValue;
  		}
  	}