code: function processItemAsync(runner, currentValidation, key, context) {
    return Promise.resolve(true).then(function() {
      return processItem(runner, currentValidation, key, context)
    });
  }
docs: Processes an individual item in the validation collection for the current validation object. Returns the value from the completed validation, which will be a boolean, or potentially a promise if the current object is an async validation.