create() and get() return an algorithm, not a credential

[emlun]

Both §5.1.3. Create a New Credential and §5.1.4. Use an Existing Credential to Make an Assertion currently resolve with:

If any authenticator indicates success, [...]

3. Let constructCredentialAlg be an algorithm that takes a global object global, and whose steps are: [...]
4. Return constructCredentialAlg and terminate this algorithm.

If any authenticator indicates success, [...]

5. Let constructAssertionAlg be an algorithm that takes a global object global, and whose steps are: [...]
6. Return constructAssertionAlg and terminate this algorithm.

So what's returned is just the procedure for how to create the PublicKeyCredential result, not the result itself.

Proposed Change

It seems like these final steps should instead read:

5. Let global be the [=relevant global object=], as determined by the calling {{CredentialsContainer/create()}} implementation. Return constructCredentialAlg(global) and terminate this algorithm.

[emlun]

Hm, it looks like this is the way it's supposed to be for create at least:

https://w3c.github.io/webappsec-credential-management/#algorithm-create-cred

When creating a Credential, it will return an algorithm that takes a global object and returns an interface object inheriting from Credential. This algorithm MUST be invoked from a task.

I can't find any similar language for get, though. And I'm a bit confused, because it seems like §2.5.4. Create a Credential can accept either a Credential (step 2 below) or an algorithm that produces a Credential (steps 3-4):

1. Let r be the result of executing interfaces[0]'s [[Create]](origin, options, sameOriginWithAncestors) internal method on origin, options, and sameOriginWithAncestors.

   If that threw an exception: [...]

2. If r is a Credential or null, resolve p with r, and terminate these substeps.

3. Assert: r is an algorithm (as defined in § 2.2.1.4 [[Create]] internal method).

4. Queue a task on global’s DOM manipulation task source to run the following substeps:

   1. Resolve p with the result of promise-calling r given global.

But I guess that means we could leave create() as is? But we still need to fix the language for get()?