Re: [whatwg/streams] Switching to Web IDL (#963)

Another difference I noticed:
- For "option bag" types, stream objects are currently permissive about accepting non-objects (see #962). For example, `new ReadableStream(true, false)` currently behaves like `new ReadableStream({}, {})` (or you can make it do something else by messing with `Boolean.prototype`). WebIDL is more strict and only allows undefined, null or objects for dictionary types. Although we could force WebIDL to be permissive using a union, I assume we wouldn't do that.

Re: enumerable vs. non-enumerable, I don't have an opinion except that I'd like to be able to justify whatever choice we make.

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