Adding a partial entity with a default @ngrx/data entity collection service

Question

I've got an issue with @ngrx/data which I'm not sure would be considered a bug or working as intended. The issue centers around adding a new entity to the store with a partial type.

With this package you can create an entity collection service a couple different ways:

• Inject EntityServices and use it to grab one of the default entity collection services from its registry like so...

constructor(entityServices: EntityServices) {
  this.defautHeroesService = entityServices.getEntityCollectionService('Hero');
  this.heroes$ = this.defautHeroesService.entities$;
}

• Or, create a custom entity collection service by extending EntityCollectionServiceBase then inject that service like so...

constructor(public customHeroesService: HeroesService) {
  this.heroes$ = this.customHeroesService.entities$;
}

I've noticed the add method of default vs custom entity collection services behaves differently. The custom service will let you supply a partial type which is very handy if any of your database fields are nullable. However, with the add method of the default service TypeScript will complain if you try supplying a partial. I would like to avoid creating a custom service for every single entity type as the only reason I went down this @ngrx/data path in the first place was the promise of "Zero Ngrx Boilerplate" for entity data, or at lease minimal boilerplate.

Am I doing something wrong? Is there a legitimate reason for this? Is there some other way to grab a default service?