message: make sure event is a ctor closes
diff: @@ -363,7 +363,7 @@ export default class Field {
  };
  } else {
  fn = (...args) => {
  - if (args.length === 0 || args[0] instanceof Event) {
  + if (args.length === 0 || (isCallable(Event) && args[0] instanceof Event)) {
  args[0] = this.value;
  }
  this.validator.validate(`#${this.id}`, args[0]);
  