angular - 动态设置验证器后是否需要调用 updateValueAndValidity

Question

setAsyncValidators尽管我在文件中查看了文档，但我正在使用node_modules/@angular/forms/forms.d.ts

我播种以下内容：

get updateOn(): FormHooks;
    /**
     * Sets the synchronous validators that are active on this control.  Calling
     * this overwrites any existing sync validators.
     *
     * When you add or remove a validator at run time, you must call
     * `updateValueAndValidity()` for the new validation to take effect.
     *
     */
    setValidators(newValidator: ValidatorFn | ValidatorFn[] | null): void;
    /**
     * Sets the async validators that are active on this control. Calling this
     * overwrites any existing async validators.
     *
     * When you add or remove a validator at run time, you must call
     * `updateValueAndValidity()` for the new validation to take effect.
     *
     */
    setAsyncValidators(newValidator: AsyncValidatorFn | AsyncValidatorFn[] | null): void;
    /**
     * Empties out the sync validator list.
     *
     * When you add or remove a validator at run time, you must call
     * `updateValueAndValidity()` for the new validation to take effect.
     *
     */
    clearValidators(): void;
    /**
     * Empties out the async validator list.
     *
     * When you add or remove a validator at run time, you must call
     * `updateValueAndValidity()` for the new validation to take effect.
     *
     */
    clearAsyncValidators(): void;

因为在没有调用 updateValueAndValidity 的情况下一切正常，所以我很困惑实际上是否有必要？