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