With new signal forms in 21, the documentation says I should be able to mark a form input as nullable. There's an example right here in there documentation https://angular.dev/guide/forms/signals/model-design#avoid-undefined

When I try that I'm getting a type error and I can't find the workaround:

import { Component, signal } from '@angular/core';
import { Field, form, required } from '@angular/forms/signals';

interface Entity {
  name: string;
  description: string | null;
}

@Component({
  selector: 'bo-scaffold-label',
  imports: [Field],
  template: `
    
testing
    

      Name
      
      Description
      
      submit
    
  `
})
export class ScaffoldLabel {
  protected readonly entity = signal({
    name: '',
    description: null
  });
  protected readonly form = form(this.entity, (path) => {
    required(path.name);
  });

  protected submit($event: Event) {
    $event.preventDefault();
    $event.stopPropagation();
    console.log('submit', this.entity());
  }
}

On the line with [field]="form.description" I get the error TS2322: Type 'string | null' is not assignable to type 'string'. Type 'null' is not assignable to type 'string'.. Is there some setting in the tsconfig I'm missing?