code: function booleanFalse(validatedObject, errorText) {
    if (!_.isBoolean(validatedObject) || validatedObject) {
      throw new ValidationError(errorText || 'Validated object is not False');
    }
    return validatedObject;
  }
docs: Checks value to be a False boolean
  @param {*} validatedObject
  @param {String} [errorText] - message for error thrown if validation fails
  @returns {boolean} validatedObject