encountered issues with asyncIterator, found suggestions for and successfully implemented asyncIterableIterator

[jayhcrawford]

You will find that the docs reference this method (asyncIterableIterator) under the AsyncIterator section, and cease referencing AsyncIterator:
https://www.apollographql.com/tutorials/federated-subscriptions-typescript/06-subscription-resolver#asynciterator

When I use AsyncIterator and the course content copied directly, Apollo Server gives this error:

{
  "errors": [
    {
      "message": "pubsub.asyncIterator is not a function",
      "locations": [
        {
          "line": 2,
          "column": 3
        }
      ],
      "path": [
        "newBook"
      ]
   }
  ]
}

by changing the method to asyncIterableIterator per suggestion from this Stack Overflow answer:
https://stackoverflow.com/questions/79302579/pubsub-error-property-asynciterator-does-not-exist-on-type-pubsubrecordstr
and following the structure described in the docs:
https://www.apollographql.com/tutorials/federated-subscriptions-typescript/06-subscription-resolver#asynciterator

Apollo Server successfully opened a subscription connection and showed subscriptions working as expected.

It looks like AsyncIterator is implemented, albeit differently here:
https://www.npmjs.com/package/graphql-subscriptions
but these docs also make reference to asyncIterableIterator, and its usage looks more similar to the course's suggested usage of AsyncIterator.