Re: [whatwg/streams] [[stream]] can not be undefined in "get the next iteration result" (Issue #1246)

You're right, this can be an assert. 👍 

Same thing for the async iterator return steps: Web IDL guarantees that this will only be called when the iterator's "is finished" is still `false`, and it immediately sets it to `true` after running those steps for the first (and only) time.

The Web IDL machinery for async iteration did not yet exist when we first specced this in #980, so these checks were necessary back then. But nowadays, we can rely on Web IDL instead.

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