Re: [whatwg/streams] Communication between workers/windows via Streams API (#244)

> you can't really tell if something is cloneable until you try to clone it (e.g. it may have a throwing getter property). So we couldn't really perform this check until we're ready to do the clone/transfer.

Is cloning synchronously on enqueue, instead of on dequeue, not feasible/performant? I guess the queue has to stay in the underlyingSource's thread so that desiredSize is always known synchronously...

Actually I always wondered why structured-clone isn't ever exposed as an API to javascript. Does any implementation of it exist outside of the engines themselves? [realistic-structured-clone](https://www.npmjs.com/package/realistic-structured-clone) tries but it says it's really incomplete (can't handle Map, Set, ArrayBuffer, etc).

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